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authorCVS to git conversion script <webmaster@postgresql.org>2002-06-20 20:29:55 +0000
committerCVS to git conversion script <webmaster@postgresql.org>2002-06-20 20:29:55 +0000
commit05dedace84ef8c93fea5309c3ac55f889011429b (patch)
tree4c7f513afbbc03060039a165d1770e11be711773 /src/backend/storage/lmgr/lock.c
parentd84fe82230c593f3dc5d7f427849b99d1efa8a0a (diff)
This commit was manufactured by cvs2git to create branch 'ecpg_big_bison'.
Sprout from master 2002-06-20 20:29:54 UTC Bruce Momjian <bruce@momjian.us> 'Update copyright to 2002.' 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src/include/storage/buf.h src/include/storage/buf_internals.h src/include/storage/buffile.h src/include/storage/bufmgr.h src/include/storage/bufpage.h src/include/storage/fd.h src/include/storage/freespace.h src/include/storage/ipc.h src/include/storage/item.h src/include/storage/itemid.h src/include/storage/itempos.h src/include/storage/itemptr.h src/include/storage/large_object.h src/include/storage/lmgr.h src/include/storage/lock.h src/include/storage/lwlock.h src/include/storage/off.h src/include/storage/page.h src/include/storage/pg_sema.h src/include/storage/pg_shmem.h src/include/storage/pmsignal.h src/include/storage/pos.h src/include/storage/proc.h src/include/storage/relfilenode.h src/include/storage/s_lock.h src/include/storage/shmem.h src/include/storage/sinval.h src/include/storage/sinvaladt.h src/include/storage/smgr.h src/include/storage/spin.h src/include/strdup.h src/include/tcop/dest.h src/include/tcop/fastpath.h src/include/tcop/pquery.h src/include/tcop/tcopdebug.h src/include/tcop/tcopprot.h src/include/tcop/utility.h src/include/utils/acl.h src/include/utils/array.h src/include/utils/ascii.h src/include/utils/bit.h src/include/utils/builtins.h src/include/utils/cash.h src/include/utils/catcache.h src/include/utils/date.h src/include/utils/datetime.h src/include/utils/datum.h src/include/utils/dynahash.h src/include/utils/dynamic_loader.h src/include/utils/elog.h src/include/utils/exc.h src/include/utils/excid.h src/include/utils/fcache.h src/include/utils/fmgrtab.h src/include/utils/formatting.h src/include/utils/geo_decls.h src/include/utils/guc.h src/include/utils/hsearch.h src/include/utils/inet.h src/include/utils/int8.h src/include/utils/inval.h src/include/utils/logtape.h src/include/utils/lsyscache.h src/include/utils/memutils.h src/include/utils/nabstime.h src/include/utils/numeric.h src/include/utils/palloc.h src/include/utils/pg_crc.h src/include/utils/pg_locale.h src/include/utils/pg_lzcompress.h src/include/utils/portal.h src/include/utils/ps_status.h src/include/utils/rel.h src/include/utils/relcache.h src/include/utils/selfuncs.h src/include/utils/sets.h src/include/utils/syscache.h src/include/utils/timestamp.h src/include/utils/tqual.h src/include/utils/tuplesort.h src/include/utils/tuplestore.h src/include/utils/varbit.h src/interfaces/Makefile src/interfaces/cli/example1.c src/interfaces/cli/example2.c src/interfaces/cli/sqlcli.h src/interfaces/jdbc/CHANGELOG src/interfaces/jdbc/Implementation src/interfaces/jdbc/Makefile src/interfaces/jdbc/README src/interfaces/jdbc/build.xml src/interfaces/jdbc/example/ImageViewer.java src/interfaces/jdbc/example/Unicode.java src/interfaces/jdbc/example/basic.java src/interfaces/jdbc/example/blobtest.java src/interfaces/jdbc/example/corba/StockClient.java src/interfaces/jdbc/example/corba/StockDB.java src/interfaces/jdbc/example/corba/StockDispenserImpl.java src/interfaces/jdbc/example/corba/StockItemImpl.java src/interfaces/jdbc/example/corba/StockServer.java src/interfaces/jdbc/example/corba/readme src/interfaces/jdbc/example/corba/stock.idl src/interfaces/jdbc/example/corba/stock.sql src/interfaces/jdbc/example/datestyle.java src/interfaces/jdbc/example/metadata.java src/interfaces/jdbc/example/psql.java src/interfaces/jdbc/example/threadsafe.java src/interfaces/jdbc/jdbc.jpx src/interfaces/jdbc/org/postgresql/Connection.java src/interfaces/jdbc/org/postgresql/Driver.java.in src/interfaces/jdbc/org/postgresql/Field.java src/interfaces/jdbc/org/postgresql/PG_Stream.java src/interfaces/jdbc/org/postgresql/PostgresqlDataSource.java src/interfaces/jdbc/org/postgresql/ResultSet.java src/interfaces/jdbc/org/postgresql/Statement.java src/interfaces/jdbc/org/postgresql/core/BytePoolDim1.java src/interfaces/jdbc/org/postgresql/core/BytePoolDim2.java src/interfaces/jdbc/org/postgresql/core/Encoding.java src/interfaces/jdbc/org/postgresql/core/MemoryPool.java src/interfaces/jdbc/org/postgresql/core/ObjectPool.java src/interfaces/jdbc/org/postgresql/core/QueryExecutor.java src/interfaces/jdbc/org/postgresql/core/SimpleObjectPool.java src/interfaces/jdbc/org/postgresql/core/StartupPacket.java src/interfaces/jdbc/org/postgresql/errors.properties src/interfaces/jdbc/org/postgresql/errors_de.properties src/interfaces/jdbc/org/postgresql/errors_fr.properties src/interfaces/jdbc/org/postgresql/errors_it.properties src/interfaces/jdbc/org/postgresql/errors_nl.properties src/interfaces/jdbc/org/postgresql/errors_zh_TW.properties src/interfaces/jdbc/org/postgresql/fastpath/Fastpath.java src/interfaces/jdbc/org/postgresql/fastpath/FastpathArg.java src/interfaces/jdbc/org/postgresql/geometric/PGbox.java src/interfaces/jdbc/org/postgresql/geometric/PGcircle.java src/interfaces/jdbc/org/postgresql/geometric/PGline.java src/interfaces/jdbc/org/postgresql/geometric/PGlseg.java src/interfaces/jdbc/org/postgresql/geometric/PGpath.java src/interfaces/jdbc/org/postgresql/geometric/PGpoint.java src/interfaces/jdbc/org/postgresql/geometric/PGpolygon.java src/interfaces/jdbc/org/postgresql/jdbc1/CallableStatement.java src/interfaces/jdbc/org/postgresql/jdbc1/Connection.java src/interfaces/jdbc/org/postgresql/jdbc1/DatabaseMetaData.java src/interfaces/jdbc/org/postgresql/jdbc1/PreparedStatement.java src/interfaces/jdbc/org/postgresql/jdbc1/ResultSet.java src/interfaces/jdbc/org/postgresql/jdbc1/ResultSetMetaData.java src/interfaces/jdbc/org/postgresql/jdbc1/Statement.java src/interfaces/jdbc/org/postgresql/jdbc2/Array.java src/interfaces/jdbc/org/postgresql/jdbc2/CallableStatement.java src/interfaces/jdbc/org/postgresql/jdbc2/Connection.java src/interfaces/jdbc/org/postgresql/jdbc2/DatabaseMetaData.java src/interfaces/jdbc/org/postgresql/jdbc2/PBatchUpdateException.java src/interfaces/jdbc/org/postgresql/jdbc2/PreparedStatement.java src/interfaces/jdbc/org/postgresql/jdbc2/ResultSet.java src/interfaces/jdbc/org/postgresql/jdbc2/ResultSetMetaData.java src/interfaces/jdbc/org/postgresql/jdbc2/Statement.java src/interfaces/jdbc/org/postgresql/jdbc2/UpdateableResultSet.java src/interfaces/jdbc/org/postgresql/largeobject/BlobInputStream.java src/interfaces/jdbc/org/postgresql/largeobject/BlobOutputStream.java src/interfaces/jdbc/org/postgresql/largeobject/LargeObject.java src/interfaces/jdbc/org/postgresql/largeobject/LargeObjectManager.java src/interfaces/jdbc/org/postgresql/largeobject/PGblob.java src/interfaces/jdbc/org/postgresql/largeobject/PGclob.java src/interfaces/jdbc/org/postgresql/test/JDBC2Tests.java src/interfaces/jdbc/org/postgresql/test/README src/interfaces/jdbc/org/postgresql/test/jdbc2/ANTTest.java src/interfaces/jdbc/org/postgresql/test/jdbc2/BatchExecuteTest.java src/interfaces/jdbc/org/postgresql/test/jdbc2/BlobTest.java src/interfaces/jdbc/org/postgresql/test/jdbc2/ConnectionTest.java src/interfaces/jdbc/org/postgresql/test/jdbc2/DatabaseMetaDataTest.java src/interfaces/jdbc/org/postgresql/test/jdbc2/DateTest.java src/interfaces/jdbc/org/postgresql/test/jdbc2/DriverTest.java src/interfaces/jdbc/org/postgresql/test/jdbc2/EncodingTest.java src/interfaces/jdbc/org/postgresql/test/jdbc2/JBuilderTest.java src/interfaces/jdbc/org/postgresql/test/jdbc2/MiscTest.java src/interfaces/jdbc/org/postgresql/test/jdbc2/ResultSetTest.java src/interfaces/jdbc/org/postgresql/test/jdbc2/TimeTest.java src/interfaces/jdbc/org/postgresql/test/jdbc2/TimestampTest.java src/interfaces/jdbc/org/postgresql/test/jdbc2/UpdateableResultTest.java src/interfaces/jdbc/org/postgresql/util/MD5Digest.java src/interfaces/jdbc/org/postgresql/util/MessageTranslator.java src/interfaces/jdbc/org/postgresql/util/PGbytea.java src/interfaces/jdbc/org/postgresql/util/PGmoney.java src/interfaces/jdbc/org/postgresql/util/PGobject.java src/interfaces/jdbc/org/postgresql/util/PGtokenizer.java src/interfaces/jdbc/org/postgresql/util/PSQLException.java src/interfaces/jdbc/org/postgresql/util/Serialize.java src/interfaces/jdbc/org/postgresql/util/UnixCrypt.java src/interfaces/jdbc/org/postgresql/xa/ClientConnection.java src/interfaces/jdbc/org/postgresql/xa/TwoPhaseConnection.java src/interfaces/jdbc/org/postgresql/xa/TxConnection.java src/interfaces/jdbc/org/postgresql/xa/XAConnectionImpl.java src/interfaces/jdbc/org/postgresql/xa/XADataSourceImpl.java src/interfaces/jdbc/utils/CheckVersion.java src/interfaces/jdbc/utils/buildDriver src/interfaces/jdbc/utils/changelog.pl src/interfaces/libpgeasy/Makefile src/interfaces/libpgeasy/README src/interfaces/libpgeasy/examples/Makefile src/interfaces/libpgeasy/examples/pginsert.c src/interfaces/libpgeasy/examples/pgmultiresult.c src/interfaces/libpgeasy/examples/pgnulltest.c src/interfaces/libpgeasy/examples/pgwordcount.c src/interfaces/libpgeasy/halt.c src/interfaces/libpgeasy/halt.h src/interfaces/libpgeasy/libpgeasy.c src/interfaces/libpgeasy/libpgeasy.h src/interfaces/libpgtcl/Makefile src/interfaces/libpgtcl/README 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src/interfaces/libpq/ru.po src/interfaces/libpq/sv.po src/interfaces/libpq/win32.c src/interfaces/libpq/win32.h src/interfaces/libpq/win32.mak src/interfaces/libpq/zh_CN.po src/interfaces/libpq/zh_TW.po src/interfaces/libpq++/CHANGES src/interfaces/libpq++/Makefile src/interfaces/libpq++/README src/interfaces/libpq++/TODO src/interfaces/libpq++/examples/Makefile src/interfaces/libpq++/examples/testlibpq0.cc src/interfaces/libpq++/examples/testlibpq1.cc src/interfaces/libpq++/examples/testlibpq2.cc src/interfaces/libpq++/examples/testlibpq2.sql src/interfaces/libpq++/examples/testlibpq3.cc src/interfaces/libpq++/examples/testlibpq3.sql src/interfaces/libpq++/examples/testlibpq4.cc src/interfaces/libpq++/examples/testlibpq4.sql src/interfaces/libpq++/examples/testlibpq5.cc src/interfaces/libpq++/examples/testlibpq5.sql src/interfaces/libpq++/examples/testlibpq6.cc src/interfaces/libpq++/examples/testlo.cc src/interfaces/libpq++/libpq++.h src/interfaces/libpq++/libpq++dll.rc src/interfaces/libpq++/pgconnection.cc src/interfaces/libpq++/pgconnection.h src/interfaces/libpq++/pgcursordb.cc src/interfaces/libpq++/pgcursordb.h src/interfaces/libpq++/pgdatabase.cc src/interfaces/libpq++/pgdatabase.h src/interfaces/libpq++/pglobject.cc src/interfaces/libpq++/pglobject.h src/interfaces/libpq++/pgtransdb.cc src/interfaces/libpq++/pgtransdb.h src/interfaces/libpq++/win32.mak src/interfaces/odbc/GNUmakefile src/interfaces/odbc/bind.c src/interfaces/odbc/bind.h src/interfaces/odbc/columninfo.c src/interfaces/odbc/columninfo.h src/interfaces/odbc/connection.c src/interfaces/odbc/connection.h src/interfaces/odbc/convert.c src/interfaces/odbc/convert.h src/interfaces/odbc/descriptor.h src/interfaces/odbc/dlg_specific.c src/interfaces/odbc/dlg_specific.h src/interfaces/odbc/dlg_wingui.c src/interfaces/odbc/drvconn.c src/interfaces/odbc/environ.c src/interfaces/odbc/environ.h src/interfaces/odbc/execute.c src/interfaces/odbc/gpps.c src/interfaces/odbc/gpps.h src/interfaces/odbc/info.c src/interfaces/odbc/info30.c src/interfaces/odbc/iodbc.h src/interfaces/odbc/isql.h src/interfaces/odbc/isqlext.h src/interfaces/odbc/license.txt src/interfaces/odbc/lobj.c src/interfaces/odbc/lobj.h src/interfaces/odbc/md5.c src/interfaces/odbc/md5.h src/interfaces/odbc/misc.c src/interfaces/odbc/misc.h src/interfaces/odbc/multibyte.c src/interfaces/odbc/multibyte.h src/interfaces/odbc/notice.txt src/interfaces/odbc/odbc.sql src/interfaces/odbc/odbcapi.c src/interfaces/odbc/odbcapi25w.c src/interfaces/odbc/odbcapi30.c src/interfaces/odbc/odbcapi30w.c src/interfaces/odbc/odbcapiw.c src/interfaces/odbc/odbcinst.ini src/interfaces/odbc/options.c src/interfaces/odbc/parse.c src/interfaces/odbc/pgapi30.c src/interfaces/odbc/pgapifunc.h src/interfaces/odbc/pgtypes.c src/interfaces/odbc/pgtypes.h src/interfaces/odbc/psqlodbc.c src/interfaces/odbc/psqlodbc.h src/interfaces/odbc/psqlodbc.rc src/interfaces/odbc/psqlodbc.reg src/interfaces/odbc/psqlodbc30.reg src/interfaces/odbc/psqlodbc30w.reg src/interfaces/odbc/psqlodbc_api30.def src/interfaces/odbc/psqlodbc_api30w.def src/interfaces/odbc/psqlodbc_apiw.def src/interfaces/odbc/psqlodbc_win32.def src/interfaces/odbc/qresult.c src/interfaces/odbc/qresult.h src/interfaces/odbc/readme.txt src/interfaces/odbc/resource.h src/interfaces/odbc/results.c src/interfaces/odbc/setup.c src/interfaces/odbc/setup.rul src/interfaces/odbc/socket.c src/interfaces/odbc/socket.h src/interfaces/odbc/statement.c src/interfaces/odbc/statement.h src/interfaces/odbc/tuple.c src/interfaces/odbc/tuple.h src/interfaces/odbc/tuplelist.c src/interfaces/odbc/tuplelist.h src/interfaces/odbc/version.h src/interfaces/odbc/win32.mak src/interfaces/odbc/win32_30.mak src/interfaces/odbc/win32_30w.mak src/interfaces/odbc/win32w.mak src/interfaces/odbc/win_md5.c src/interfaces/odbc/win_setup.h src/interfaces/odbc/win_unicode.c src/interfaces/perl5/Changes src/interfaces/perl5/GNUmakefile src/interfaces/perl5/MANIFEST src/interfaces/perl5/Makefile.PL src/interfaces/perl5/Pg.pm src/interfaces/perl5/Pg.xs src/interfaces/perl5/README src/interfaces/perl5/examples/ApachePg.pl src/interfaces/perl5/examples/example.newstyle src/interfaces/perl5/examples/example.oldstyle src/interfaces/perl5/ppport.h src/interfaces/perl5/test.pl src/interfaces/perl5/typemap src/interfaces/python/Announce src/interfaces/python/ChangeLog src/interfaces/python/GNUmakefile src/interfaces/python/PyGreSQL.spec src/interfaces/python/README src/interfaces/python/README.linux src/interfaces/python/Setup.in.raw src/interfaces/python/pg.py src/interfaces/python/pgdb.py src/interfaces/python/pgmodule.c src/interfaces/python/setup.py src/interfaces/python/tutorial/advanced.py src/interfaces/python/tutorial/basics.py src/interfaces/python/tutorial/func.py src/interfaces/python/tutorial/syscat.py src/interfaces/ssl/client.conf src/interfaces/ssl/mkcert.sh src/interfaces/ssl/pgkeygen.sh src/interfaces/ssl/root.conf src/interfaces/ssl/server.conf src/makefiles/Makefile.aix src/makefiles/Makefile.beos src/makefiles/Makefile.bsdi src/makefiles/Makefile.darwin src/makefiles/Makefile.dgux src/makefiles/Makefile.freebsd src/makefiles/Makefile.hpux src/makefiles/Makefile.irix5 src/makefiles/Makefile.linux src/makefiles/Makefile.netbsd src/makefiles/Makefile.openbsd src/makefiles/Makefile.osf src/makefiles/Makefile.qnx4 src/makefiles/Makefile.sco src/makefiles/Makefile.solaris src/makefiles/Makefile.sunos4 src/makefiles/Makefile.svr4 src/makefiles/Makefile.ultrix4 src/makefiles/Makefile.univel src/makefiles/Makefile.unixware src/makefiles/Makefile.win src/nls-global.mk src/pl/Makefile src/pl/plperl/GNUmakefile src/pl/plperl/README src/pl/plperl/SPI.xs src/pl/plperl/eloglvl.c src/pl/plperl/eloglvl.h src/pl/plperl/plperl.c src/pl/plperl/ppport.h src/pl/plpgsql/Makefile src/pl/plpgsql/src/.cvsignore src/pl/plpgsql/src/INSTALL src/pl/plpgsql/src/Makefile src/pl/plpgsql/src/gram.y src/pl/plpgsql/src/pl_comp.c 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src/test/bench/query01 src/test/bench/query02 src/test/bench/query03 src/test/bench/query04 src/test/bench/query05 src/test/bench/query06 src/test/bench/query07 src/test/bench/query08 src/test/bench/query09 src/test/bench/query10 src/test/bench/query11 src/test/bench/query12 src/test/bench/query13 src/test/bench/query14 src/test/bench/query15 src/test/bench/query16 src/test/bench/query17 src/test/bench/query18 src/test/bench/query19 src/test/bench/query20 src/test/bench/query21 src/test/bench/query22 src/test/bench/query23 src/test/bench/query24 src/test/bench/query25 src/test/bench/query26 src/test/bench/query27 src/test/bench/query28 src/test/bench/query29 src/test/bench/query30 src/test/bench/query31 src/test/bench/query32 src/test/bench/runwisc.sh src/test/bench/wholebench.sh src/test/examples/Makefile src/test/examples/testlibpq.c src/test/examples/testlibpq2.c src/test/examples/testlibpq2.sql src/test/examples/testlibpq3.c src/test/examples/testlibpq3.sql src/test/examples/testlibpq4.c src/test/examples/testlo.c src/test/locale/Makefile src/test/locale/README src/test/locale/de_DE.ISO8859-1/Makefile src/test/locale/de_DE.ISO8859-1/README src/test/locale/de_DE.ISO8859-1/expected/de-ctype.out src/test/locale/de_DE.ISO8859-1/expected/test-de-char.sql.out src/test/locale/de_DE.ISO8859-1/expected/test-de-select.sql.out src/test/locale/de_DE.ISO8859-1/expected/test-de-sort.out src/test/locale/de_DE.ISO8859-1/expected/test-de-text.sql.out src/test/locale/de_DE.ISO8859-1/expected/test-de-upper-char.sql.out src/test/locale/de_DE.ISO8859-1/expected/test-de-upper-text.sql.out src/test/locale/de_DE.ISO8859-1/expected/test-de-upper-varchar.sql.out src/test/locale/de_DE.ISO8859-1/expected/test-de-varchar.sql.out src/test/locale/de_DE.ISO8859-1/runall src/test/locale/de_DE.ISO8859-1/test-de-select.sql.in src/test/locale/de_DE.ISO8859-1/test-de-sort.in src/test/locale/de_DE.ISO8859-1/test-de-upper.sql.in src/test/locale/de_DE.ISO8859-1/test-de.sql.in src/test/locale/gr_GR.ISO8859-7/Makefile src/test/locale/gr_GR.ISO8859-7/README src/test/locale/gr_GR.ISO8859-7/expected/gr-ctype.out src/test/locale/gr_GR.ISO8859-7/expected/test-gr-char.sql.out src/test/locale/gr_GR.ISO8859-7/expected/test-gr-select.sql.out src/test/locale/gr_GR.ISO8859-7/expected/test-gr-sort.out src/test/locale/gr_GR.ISO8859-7/expected/test-gr-text.sql.out src/test/locale/gr_GR.ISO8859-7/expected/test-gr-varchar.sql.out src/test/locale/gr_GR.ISO8859-7/runall src/test/locale/gr_GR.ISO8859-7/test-gr-select.sql.in src/test/locale/gr_GR.ISO8859-7/test-gr-sort.in src/test/locale/gr_GR.ISO8859-7/test-gr.sql.in src/test/locale/koi8-r/Makefile src/test/locale/koi8-r/expected/koi8-ctype.out src/test/locale/koi8-r/expected/test-koi8-char.sql.out src/test/locale/koi8-r/expected/test-koi8-select.sql.out src/test/locale/koi8-r/expected/test-koi8-sort.out src/test/locale/koi8-r/expected/test-koi8-text.sql.out src/test/locale/koi8-r/expected/test-koi8-varchar.sql.out src/test/locale/koi8-r/runall src/test/locale/koi8-r/test-koi8-select.sql.in src/test/locale/koi8-r/test-koi8-sort.in src/test/locale/koi8-r/test-koi8.sql.in src/test/locale/koi8-to-win1251/Makefile src/test/locale/koi8-to-win1251/README src/test/locale/koi8-to-win1251/expected/test-koi8-char.sql.out src/test/locale/koi8-to-win1251/expected/test-koi8-select.sql.out src/test/locale/koi8-to-win1251/expected/test-koi8-sort.out src/test/locale/koi8-to-win1251/expected/test-koi8-text.sql.out src/test/locale/koi8-to-win1251/expected/test-koi8-varchar.sql.out src/test/locale/koi8-to-win1251/runall src/test/locale/koi8-to-win1251/test-koi8-select.sql.in src/test/locale/koi8-to-win1251/test-koi8-sort.in src/test/locale/koi8-to-win1251/test-koi8.sql.in src/test/locale/sort-test.pl src/test/locale/sort-test.py src/test/locale/test-ctype.c src/test/locale/test-pgsql-locale.c src/test/mb/README src/test/mb/expected/big5.out src/test/mb/expected/euc_cn.out src/test/mb/expected/euc_jp.out src/test/mb/expected/euc_kr.out src/test/mb/expected/euc_tw.out src/test/mb/expected/mule_internal.out src/test/mb/expected/sjis.out src/test/mb/expected/unicode.out src/test/mb/mbregress.sh src/test/mb/sql/big5.sql src/test/mb/sql/euc_cn.sql src/test/mb/sql/euc_jp.sql src/test/mb/sql/euc_kr.sql src/test/mb/sql/euc_tw.sql src/test/mb/sql/mule_internal.sql src/test/mb/sql/sjis.sql src/test/mb/sql/unicode.sql src/test/performance/results/PgSQL.970926 src/test/performance/runtests.pl src/test/performance/sqls/connection src/test/performance/sqls/crtsimple src/test/performance/sqls/crtsimpleidx src/test/performance/sqls/drpsimple src/test/performance/sqls/inssimple src/test/performance/sqls/inssimple.data src/test/performance/sqls/orbsimple src/test/performance/sqls/slcsimple src/test/performance/sqls/slcsimple.data src/test/performance/sqls/vacuum src/test/performance/start-pgsql.sh src/test/regress/GNUmakefile src/test/regress/Makefile src/test/regress/README src/test/regress/data/agg.data src/test/regress/data/constrf.data src/test/regress/data/constro.data src/test/regress/data/dept.data src/test/regress/data/desc.data src/test/regress/data/emp.data src/test/regress/data/hash.data src/test/regress/data/onek.data src/test/regress/data/person.data src/test/regress/data/real_city.data src/test/regress/data/rect.data src/test/regress/data/streets.data src/test/regress/data/stud_emp.data src/test/regress/data/student.data src/test/regress/data/tenk.data src/test/regress/expected/abstime-solaris-1947.out src/test/regress/expected/abstime.out src/test/regress/expected/aggregates.out src/test/regress/expected/alter_table.out src/test/regress/expected/arrays.out src/test/regress/expected/bit.out src/test/regress/expected/boolean.out src/test/regress/expected/box.out src/test/regress/expected/btree_index.out src/test/regress/expected/case.out src/test/regress/expected/char.out src/test/regress/expected/char_1.out src/test/regress/expected/circle.out src/test/regress/expected/comments.out src/test/regress/expected/create_aggregate.out src/test/regress/expected/create_index.out src/test/regress/expected/create_misc.out src/test/regress/expected/create_operator.out src/test/regress/expected/create_table.out src/test/regress/expected/create_type.out src/test/regress/expected/create_view.out src/test/regress/expected/date.out src/test/regress/expected/domain.out src/test/regress/expected/errors.out src/test/regress/expected/euc_cn.out src/test/regress/expected/euc_jp.out src/test/regress/expected/euc_kr.out src/test/regress/expected/euc_tw.out src/test/regress/expected/float4-exp-three-digits.out src/test/regress/expected/float4.out src/test/regress/expected/float8-exp-three-digits.out src/test/regress/expected/float8-fp-exception.out src/test/regress/expected/float8-small-is-zero.out src/test/regress/expected/float8.out src/test/regress/expected/foreign_key.out src/test/regress/expected/geometry-alpha-precision.out src/test/regress/expected/geometry-bsdi-precision.out src/test/regress/expected/geometry-i86-gnulibc.out src/test/regress/expected/geometry-intel-beos.out src/test/regress/expected/geometry-irix.out src/test/regress/expected/geometry-positive-zeros-bsd.out src/test/regress/expected/geometry-positive-zeros.out src/test/regress/expected/geometry-powerpc-aix4.out src/test/regress/expected/geometry-powerpc-darwin.out src/test/regress/expected/geometry-powerpc-linux-gnulibc1.out src/test/regress/expected/geometry-solaris-i386-pc.out src/test/regress/expected/geometry-solaris-precision.out src/test/regress/expected/geometry-uw7-cc.out src/test/regress/expected/geometry-uw7-gcc.out src/test/regress/expected/geometry.out src/test/regress/expected/hash_index.out src/test/regress/expected/horology-no-DST-before-1970.out src/test/regress/expected/horology-solaris-1947.out src/test/regress/expected/horology.out src/test/regress/expected/inet.out src/test/regress/expected/inherit.out src/test/regress/expected/insert.out src/test/regress/expected/int2.out src/test/regress/expected/int4.out src/test/regress/expected/int8-exp-three-digits.out src/test/regress/expected/int8.out src/test/regress/expected/interval.out src/test/regress/expected/join.out src/test/regress/expected/limit.out src/test/regress/expected/lseg.out src/test/regress/expected/mule_internal.out src/test/regress/expected/name.out src/test/regress/expected/numeric.out src/test/regress/expected/numeric_big.out src/test/regress/expected/numerology.out src/test/regress/expected/oid.out src/test/regress/expected/oidjoins.out src/test/regress/expected/opr_sanity.out src/test/regress/expected/path.out src/test/regress/expected/plpgsql.out src/test/regress/expected/point.out src/test/regress/expected/polygon.out src/test/regress/expected/portals.out src/test/regress/expected/portals_p2.out src/test/regress/expected/privileges.out src/test/regress/expected/random.out src/test/regress/expected/reltime.out src/test/regress/expected/rules.out src/test/regress/expected/sanity_check.out src/test/regress/expected/select.out src/test/regress/expected/select_distinct.out src/test/regress/expected/select_distinct_on.out src/test/regress/expected/select_having.out src/test/regress/expected/select_having_1.out src/test/regress/expected/select_implicit.out src/test/regress/expected/select_implicit_1.out src/test/regress/expected/select_into.out src/test/regress/expected/select_views.out src/test/regress/expected/select_views_1.out src/test/regress/expected/sql_ascii.out src/test/regress/expected/strings.out src/test/regress/expected/subselect.out src/test/regress/expected/temp.out src/test/regress/expected/text.out src/test/regress/expected/time.out src/test/regress/expected/timestamp.out src/test/regress/expected/timestamptz.out src/test/regress/expected/timetz.out src/test/regress/expected/tinterval-solaris-1947.out src/test/regress/expected/tinterval.out src/test/regress/expected/transactions.out src/test/regress/expected/triggers.out src/test/regress/expected/type_sanity.out src/test/regress/expected/union.out src/test/regress/expected/varchar.out src/test/regress/expected/varchar_1.out src/test/regress/input/constraints.source src/test/regress/input/copy.source src/test/regress/input/create_function_1.source src/test/regress/input/create_function_2.source src/test/regress/input/misc.source src/test/regress/output/constraints.source src/test/regress/output/copy.source src/test/regress/output/create_function_1.source src/test/regress/output/create_function_2.source src/test/regress/output/misc.source src/test/regress/parallel_schedule src/test/regress/pg_regress.sh src/test/regress/regress.c src/test/regress/regressplans.sh src/test/regress/resultmap src/test/regress/serial_schedule src/test/regress/sql/abstime.sql src/test/regress/sql/aggregates.sql src/test/regress/sql/alter_table.sql src/test/regress/sql/arrays.sql src/test/regress/sql/bit.sql src/test/regress/sql/boolean.sql src/test/regress/sql/box.sql src/test/regress/sql/btree_index.sql src/test/regress/sql/case.sql src/test/regress/sql/char.sql src/test/regress/sql/circle.sql src/test/regress/sql/comments.sql src/test/regress/sql/create_aggregate.sql src/test/regress/sql/create_index.sql src/test/regress/sql/create_misc.sql src/test/regress/sql/create_operator.sql src/test/regress/sql/create_table.sql src/test/regress/sql/create_type.sql src/test/regress/sql/create_view.sql src/test/regress/sql/date.sql src/test/regress/sql/domain.sql src/test/regress/sql/drop.sql src/test/regress/sql/errors.sql src/test/regress/sql/euc_cn.sql src/test/regress/sql/euc_jp.sql src/test/regress/sql/euc_kr.sql src/test/regress/sql/euc_tw.sql src/test/regress/sql/float4.sql src/test/regress/sql/float8.sql src/test/regress/sql/foreign_key.sql src/test/regress/sql/geometry.sql src/test/regress/sql/hash_index.sql src/test/regress/sql/horology.sql src/test/regress/sql/inet.sql src/test/regress/sql/inherit.sql src/test/regress/sql/insert.sql src/test/regress/sql/int2.sql src/test/regress/sql/int4.sql src/test/regress/sql/int8.sql src/test/regress/sql/interval.sql src/test/regress/sql/join.sql src/test/regress/sql/limit.sql src/test/regress/sql/lseg.sql src/test/regress/sql/mule_internal.sql src/test/regress/sql/name.sql src/test/regress/sql/numeric.sql src/test/regress/sql/numeric_big.sql src/test/regress/sql/numerology.sql src/test/regress/sql/oid.sql src/test/regress/sql/oidjoins.sql src/test/regress/sql/opr_sanity.sql src/test/regress/sql/path.sql src/test/regress/sql/plpgsql.sql src/test/regress/sql/point.sql src/test/regress/sql/polygon.sql src/test/regress/sql/portals.sql src/test/regress/sql/portals_p2.sql src/test/regress/sql/privileges.sql src/test/regress/sql/random.sql src/test/regress/sql/reltime.sql src/test/regress/sql/rules.sql src/test/regress/sql/sanity_check.sql src/test/regress/sql/select.sql src/test/regress/sql/select_distinct.sql src/test/regress/sql/select_distinct_on.sql src/test/regress/sql/select_having.sql src/test/regress/sql/select_implicit.sql src/test/regress/sql/select_into.sql src/test/regress/sql/select_views.sql src/test/regress/sql/sql_ascii.sql src/test/regress/sql/strings.sql src/test/regress/sql/subselect.sql src/test/regress/sql/temp.sql src/test/regress/sql/text.sql src/test/regress/sql/time.sql src/test/regress/sql/timestamp.sql src/test/regress/sql/timestamptz.sql src/test/regress/sql/timetz.sql src/test/regress/sql/tinterval.sql src/test/regress/sql/transactions.sql src/test/regress/sql/triggers.sql src/test/regress/sql/type_sanity.sql src/test/regress/sql/union.sql src/test/regress/sql/varchar.sql src/tools/RELEASE_CHANGES src/tools/backend/README src/tools/backend/backend_dirs.html src/tools/backend/flow.fig src/tools/backend/flow.gif src/tools/backend/index.html src/tools/ccsym src/tools/copyright src/tools/entab/Makefile src/tools/entab/entab.c src/tools/entab/entab.man src/tools/entab/halt.c src/tools/find_badmacros src/tools/find_static src/tools/find_typedef src/tools/make_ctags src/tools/make_diff/README src/tools/make_diff/cporig src/tools/make_diff/difforig src/tools/make_diff/rmorig src/tools/make_etags src/tools/make_keywords src/tools/make_mkid src/tools/pgcvslog src/tools/pginclude/README src/tools/pginclude/pgcompinclude src/tools/pginclude/pgdefine src/tools/pginclude/pgfixinclude src/tools/pginclude/pgrminclude src/tools/pgindent/README src/tools/pgindent/indent.bsd.patch src/tools/pgindent/pgcppindent src/tools/pgindent/pgindent src/tools/pgindent/pgjindent src/tutorial/Makefile src/tutorial/README src/tutorial/advanced.source src/tutorial/basics.source src/tutorial/beard.c src/tutorial/complex.c src/tutorial/complex.source src/tutorial/funcs.c src/tutorial/funcs.source src/tutorial/funcs_new.c src/tutorial/syscat.source src/utils/Makefile src/utils/README src/utils/dllinit.c src/utils/getopt.c src/utils/strdup.c src/win32.mak
Diffstat (limited to 'src/backend/storage/lmgr/lock.c')
-rw-r--r--src/backend/storage/lmgr/lock.c1467
1 files changed, 0 insertions, 1467 deletions
diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
deleted file mode 100644
index 5fd619d4f6e..00000000000
--- a/src/backend/storage/lmgr/lock.c
+++ /dev/null
@@ -1,1467 +0,0 @@
-/*-------------------------------------------------------------------------
- *
- * lock.c
- * POSTGRES low-level lock mechanism
- *
- * Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group
- * Portions Copyright (c) 1994, Regents of the University of California
- *
- *
- * IDENTIFICATION
- * $Header: /cvsroot/pgsql/src/backend/storage/lmgr/lock.c,v 1.108 2002/06/20 20:29:35 momjian Exp $
- *
- * NOTES
- * Outside modules can create a lock table and acquire/release
- * locks. A lock table is a shared memory hash table. When
- * a process tries to acquire a lock of a type that conflicts
- * with existing locks, it is put to sleep using the routines
- * in storage/lmgr/proc.c.
- *
- * For the most part, this code should be invoked via lmgr.c
- * or another lock-management module, not directly.
- *
- * Interface:
- *
- * LockAcquire(), LockRelease(), LockMethodTableInit(),
- * LockMethodTableRename(), LockReleaseAll,
- * LockCheckConflicts(), GrantLock()
- *
- *-------------------------------------------------------------------------
- */
-#include "postgres.h"
-
-#include <sys/types.h>
-#include <unistd.h>
-#include <signal.h>
-
-#include "access/xact.h"
-#include "miscadmin.h"
-#include "storage/proc.h"
-#include "utils/memutils.h"
-#include "utils/ps_status.h"
-
-
-/* This configuration variable is used to set the lock table size */
-int max_locks_per_xact; /* set by guc.c */
-
-#define NLOCKENTS(maxBackends) (max_locks_per_xact * (maxBackends))
-
-
-static int WaitOnLock(LOCKMETHOD lockmethod, LOCKMODE lockmode,
- LOCK *lock, HOLDER *holder);
-static void LockCountMyLocks(SHMEM_OFFSET lockOffset, PGPROC *proc,
- int *myHolding);
-
-static char *lock_mode_names[] =
-{
- "INVALID",
- "AccessShareLock",
- "RowShareLock",
- "RowExclusiveLock",
- "ShareUpdateExclusiveLock",
- "ShareLock",
- "ShareRowExclusiveLock",
- "ExclusiveLock",
- "AccessExclusiveLock"
-};
-
-
-#ifdef LOCK_DEBUG
-
-/*------
- * The following configuration options are available for lock debugging:
- *
- * TRACE_LOCKS -- give a bunch of output what's going on in this file
- * TRACE_USERLOCKS -- same but for user locks
- * TRACE_LOCK_OIDMIN-- do not trace locks for tables below this oid
- * (use to avoid output on system tables)
- * TRACE_LOCK_TABLE -- trace locks on this table (oid) unconditionally
- * DEBUG_DEADLOCKS -- currently dumps locks at untimely occasions ;)
- *
- * Furthermore, but in storage/lmgr/lwlock.c:
- * TRACE_LWLOCKS -- trace lightweight locks (pretty useless)
- *
- * Define LOCK_DEBUG at compile time to get all these enabled.
- * --------
- */
-
-int Trace_lock_oidmin = BootstrapObjectIdData;
-bool Trace_locks = false;
-bool Trace_userlocks = false;
-int Trace_lock_table = 0;
-bool Debug_deadlocks = false;
-
-
-inline static bool
-LOCK_DEBUG_ENABLED(const LOCK *lock)
-{
- return
- (((LOCK_LOCKMETHOD(*lock) == DEFAULT_LOCKMETHOD && Trace_locks)
- || (LOCK_LOCKMETHOD(*lock) == USER_LOCKMETHOD && Trace_userlocks))
- && (lock->tag.relId >= (Oid) Trace_lock_oidmin))
- || (Trace_lock_table && (lock->tag.relId == Trace_lock_table));
-}
-
-
-inline static void
-LOCK_PRINT(const char *where, const LOCK *lock, LOCKMODE type)
-{
- if (LOCK_DEBUG_ENABLED(lock))
- elog(LOG,
- "%s: lock(%lx) tbl(%d) rel(%u) db(%u) obj(%u) grantMask(%x) "
- "req(%d,%d,%d,%d,%d,%d,%d)=%d "
- "grant(%d,%d,%d,%d,%d,%d,%d)=%d wait(%d) type(%s)",
- where, MAKE_OFFSET(lock),
- lock->tag.lockmethod, lock->tag.relId, lock->tag.dbId,
- lock->tag.objId.blkno, lock->grantMask,
- lock->requested[1], lock->requested[2], lock->requested[3],
- lock->requested[4], lock->requested[5], lock->requested[6],
- lock->requested[7], lock->nRequested,
- lock->granted[1], lock->granted[2], lock->granted[3],
- lock->granted[4], lock->granted[5], lock->granted[6],
- lock->granted[7], lock->nGranted,
- lock->waitProcs.size, lock_mode_names[type]);
-}
-
-
-inline static void
-HOLDER_PRINT(const char *where, const HOLDER *holderP)
-{
- if (
- (((HOLDER_LOCKMETHOD(*holderP) == DEFAULT_LOCKMETHOD && Trace_locks)
- || (HOLDER_LOCKMETHOD(*holderP) == USER_LOCKMETHOD && Trace_userlocks))
- && (((LOCK *) MAKE_PTR(holderP->tag.lock))->tag.relId >= (Oid) Trace_lock_oidmin))
- || (Trace_lock_table && (((LOCK *) MAKE_PTR(holderP->tag.lock))->tag.relId == Trace_lock_table))
- )
- elog(LOG,
- "%s: holder(%lx) lock(%lx) tbl(%d) proc(%lx) xid(%u) hold(%d,%d,%d,%d,%d,%d,%d)=%d",
- where, MAKE_OFFSET(holderP), holderP->tag.lock,
- HOLDER_LOCKMETHOD(*(holderP)),
- holderP->tag.proc, holderP->tag.xid,
- holderP->holding[1], holderP->holding[2], holderP->holding[3],
- holderP->holding[4], holderP->holding[5], holderP->holding[6],
- holderP->holding[7], holderP->nHolding);
-}
-
-#else /* not LOCK_DEBUG */
-
-#define LOCK_PRINT(where, lock, type)
-#define HOLDER_PRINT(where, holderP)
-#endif /* not LOCK_DEBUG */
-
-
-/*
- * These are to simplify/speed up some bit arithmetic.
- *
- * XXX is a fetch from a static array really faster than a shift?
- * Wouldn't bet on it...
- */
-
-static LOCKMASK BITS_OFF[MAX_LOCKMODES];
-static LOCKMASK BITS_ON[MAX_LOCKMODES];
-
-/*
- * map from lockmethod to the lock table structure
- */
-static LOCKMETHODTABLE *LockMethodTable[MAX_LOCK_METHODS];
-
-static int NumLockMethods;
-
-/*
- * InitLocks -- Init the lock module. Create a private data
- * structure for constructing conflict masks.
- */
-void
-InitLocks(void)
-{
- int i;
- int bit;
-
- bit = 1;
- for (i = 0; i < MAX_LOCKMODES; i++, bit <<= 1)
- {
- BITS_ON[i] = bit;
- BITS_OFF[i] = ~bit;
- }
-}
-
-
-/*
- * Fetch the lock method table associated with a given lock
- */
-LOCKMETHODTABLE *
-GetLocksMethodTable(LOCK *lock)
-{
- LOCKMETHOD lockmethod = LOCK_LOCKMETHOD(*lock);
-
- Assert(lockmethod > 0 && lockmethod < NumLockMethods);
- return LockMethodTable[lockmethod];
-}
-
-
-/*
- * LockMethodInit -- initialize the lock table's lock type
- * structures
- *
- * Notes: just copying. Should only be called once.
- */
-static void
-LockMethodInit(LOCKMETHODTABLE *lockMethodTable,
- LOCKMASK *conflictsP,
- int *prioP,
- int numModes)
-{
- int i;
-
- lockMethodTable->ctl->numLockModes = numModes;
- numModes++;
- for (i = 0; i < numModes; i++, prioP++, conflictsP++)
- {
- lockMethodTable->ctl->conflictTab[i] = *conflictsP;
- lockMethodTable->ctl->prio[i] = *prioP;
- }
-}
-
-/*
- * LockMethodTableInit -- initialize a lock table structure
- *
- * NOTE: data structures allocated here are allocated permanently, using
- * TopMemoryContext and shared memory. We don't ever release them anyway,
- * and in normal multi-backend operation the lock table structures set up
- * by the postmaster are inherited by each backend, so they must be in
- * TopMemoryContext.
- */
-LOCKMETHOD
-LockMethodTableInit(char *tabName,
- LOCKMASK *conflictsP,
- int *prioP,
- int numModes,
- int maxBackends)
-{
- LOCKMETHODTABLE *lockMethodTable;
- char *shmemName;
- HASHCTL info;
- int hash_flags;
- bool found;
- long init_table_size,
- max_table_size;
-
- if (numModes >= MAX_LOCKMODES)
- {
- elog(WARNING, "LockMethodTableInit: too many lock types %d greater than %d",
- numModes, MAX_LOCKMODES);
- return INVALID_LOCKMETHOD;
- }
-
- /* Compute init/max size to request for lock hashtables */
- max_table_size = NLOCKENTS(maxBackends);
- init_table_size = max_table_size / 10;
-
- /* Allocate a string for the shmem index table lookups. */
- /* This is just temp space in this routine, so palloc is OK. */
- shmemName = (char *) palloc(strlen(tabName) + 32);
-
- /* each lock table has a non-shared, permanent header */
- lockMethodTable = (LOCKMETHODTABLE *)
- MemoryContextAlloc(TopMemoryContext, sizeof(LOCKMETHODTABLE));
-
- /*
- * Lock the LWLock for the table (probably not necessary here)
- */
- LWLockAcquire(LockMgrLock, LW_EXCLUSIVE);
-
- /*
- * allocate a control structure from shared memory or attach to it if
- * it already exists.
- */
- sprintf(shmemName, "%s (ctl)", tabName);
- lockMethodTable->ctl = (LOCKMETHODCTL *)
- ShmemInitStruct(shmemName, sizeof(LOCKMETHODCTL), &found);
-
- if (!lockMethodTable->ctl)
- elog(FATAL, "LockMethodTableInit: couldn't initialize %s", tabName);
-
- /*
- * no zero-th table
- */
- NumLockMethods = 1;
-
- /*
- * we're first - initialize
- */
- if (!found)
- {
- MemSet(lockMethodTable->ctl, 0, sizeof(LOCKMETHODCTL));
- lockMethodTable->ctl->masterLock = LockMgrLock;
- lockMethodTable->ctl->lockmethod = NumLockMethods;
- }
-
- /*
- * other modules refer to the lock table by a lockmethod ID
- */
- LockMethodTable[NumLockMethods] = lockMethodTable;
- NumLockMethods++;
- Assert(NumLockMethods <= MAX_LOCK_METHODS);
-
- /*
- * allocate a hash table for LOCK structs. This is used to store
- * per-locked-object information.
- */
- info.keysize = sizeof(LOCKTAG);
- info.entrysize = sizeof(LOCK);
- info.hash = tag_hash;
- hash_flags = (HASH_ELEM | HASH_FUNCTION);
-
- sprintf(shmemName, "%s (lock hash)", tabName);
- lockMethodTable->lockHash = ShmemInitHash(shmemName,
- init_table_size,
- max_table_size,
- &info,
- hash_flags);
-
- if (!lockMethodTable->lockHash)
- elog(FATAL, "LockMethodTableInit: couldn't initialize %s", tabName);
- Assert(lockMethodTable->lockHash->hash == tag_hash);
-
- /*
- * allocate a hash table for HOLDER structs. This is used to store
- * per-lock-holder information.
- */
- info.keysize = sizeof(HOLDERTAG);
- info.entrysize = sizeof(HOLDER);
- info.hash = tag_hash;
- hash_flags = (HASH_ELEM | HASH_FUNCTION);
-
- sprintf(shmemName, "%s (holder hash)", tabName);
- lockMethodTable->holderHash = ShmemInitHash(shmemName,
- init_table_size,
- max_table_size,
- &info,
- hash_flags);
-
- if (!lockMethodTable->holderHash)
- elog(FATAL, "LockMethodTableInit: couldn't initialize %s", tabName);
-
- /* init ctl data structures */
- LockMethodInit(lockMethodTable, conflictsP, prioP, numModes);
-
- LWLockRelease(LockMgrLock);
-
- pfree(shmemName);
-
- return lockMethodTable->ctl->lockmethod;
-}
-
-/*
- * LockMethodTableRename -- allocate another lockmethod ID to the same
- * lock table.
- *
- * NOTES: Both the lock module and the lock chain (lchain.c)
- * module use table id's to distinguish between different
- * kinds of locks. Short term and long term locks look
- * the same to the lock table, but are handled differently
- * by the lock chain manager. This function allows the
- * client to use different lockmethods when acquiring/releasing
- * short term and long term locks, yet store them all in one hashtable.
- */
-
-LOCKMETHOD
-LockMethodTableRename(LOCKMETHOD lockmethod)
-{
- LOCKMETHOD newLockMethod;
-
- if (NumLockMethods >= MAX_LOCK_METHODS)
- return INVALID_LOCKMETHOD;
- if (LockMethodTable[lockmethod] == INVALID_LOCKMETHOD)
- return INVALID_LOCKMETHOD;
-
- /* other modules refer to the lock table by a lockmethod ID */
- newLockMethod = NumLockMethods;
- NumLockMethods++;
-
- LockMethodTable[newLockMethod] = LockMethodTable[lockmethod];
- return newLockMethod;
-}
-
-/*
- * LockAcquire -- Check for lock conflicts, sleep if conflict found,
- * set lock if/when no conflicts.
- *
- * Returns: TRUE if lock was acquired, FALSE otherwise. Note that
- * a FALSE return is to be expected if dontWait is TRUE;
- * but if dontWait is FALSE, only a parameter error can cause
- * a FALSE return. (XXX probably we should just elog on parameter
- * errors, instead of conflating this with failure to acquire lock?)
- *
- * Side Effects: The lock is acquired and recorded in lock tables.
- *
- * NOTE: if we wait for the lock, there is no way to abort the wait
- * short of aborting the transaction.
- *
- *
- * Note on User Locks:
- *
- * User locks are handled totally on the application side as
- * long term cooperative locks which extend beyond the normal
- * transaction boundaries. Their purpose is to indicate to an
- * application that someone is `working' on an item. So it is
- * possible to put an user lock on a tuple's oid, retrieve the
- * tuple, work on it for an hour and then update it and remove
- * the lock. While the lock is active other clients can still
- * read and write the tuple but they can be aware that it has
- * been locked at the application level by someone.
- * User locks use lock tags made of an uint16 and an uint32, for
- * example 0 and a tuple oid, or any other arbitrary pair of
- * numbers following a convention established by the application.
- * In this sense tags don't refer to tuples or database entities.
- * User locks and normal locks are completely orthogonal and
- * they don't interfere with each other, so it is possible
- * to acquire a normal lock on an user-locked tuple or user-lock
- * a tuple for which a normal write lock already exists.
- * User locks are always non blocking, therefore they are never
- * acquired if already held by another process. They must be
- * released explicitly by the application but they are released
- * automatically when a backend terminates.
- * They are indicated by a lockmethod 2 which is an alias for the
- * normal lock table, and are distinguished from normal locks
- * by the following differences:
- *
- * normal lock user lock
- *
- * lockmethod 1 2
- * tag.dbId database oid database oid
- * tag.relId rel oid or 0 0
- * tag.objId block id lock id2
- * or xact id
- * tag.offnum 0 lock id1
- * holder.xid xid or 0 0
- * persistence transaction user or backend
- * or backend
- *
- * The lockmode parameter can have the same values for normal locks
- * although probably only WRITE_LOCK can have some practical use.
- *
- * DZ - 22 Nov 1997
- */
-
-bool
-LockAcquire(LOCKMETHOD lockmethod, LOCKTAG *locktag,
- TransactionId xid, LOCKMODE lockmode, bool dontWait)
-{
- HOLDER *holder;
- HOLDERTAG holdertag;
- HTAB *holderTable;
- bool found;
- LOCK *lock;
- LWLockId masterLock;
- LOCKMETHODTABLE *lockMethodTable;
- int status;
- int myHolding[MAX_LOCKMODES];
- int i;
-
-#ifdef LOCK_DEBUG
- if (lockmethod == USER_LOCKMETHOD && Trace_userlocks)
- elog(LOG, "LockAcquire: user lock [%u] %s",
- locktag->objId.blkno, lock_mode_names[lockmode]);
-#endif
-
- /* ???????? This must be changed when short term locks will be used */
- locktag->lockmethod = lockmethod;
-
- Assert(lockmethod < NumLockMethods);
- lockMethodTable = LockMethodTable[lockmethod];
- if (!lockMethodTable)
- {
- elog(WARNING, "LockAcquire: bad lock table %d", lockmethod);
- return FALSE;
- }
-
- masterLock = lockMethodTable->ctl->masterLock;
-
- LWLockAcquire(masterLock, LW_EXCLUSIVE);
-
- /*
- * Find or create a lock with this tag
- */
- Assert(lockMethodTable->lockHash->hash == tag_hash);
- lock = (LOCK *) hash_search(lockMethodTable->lockHash,
- (void *) locktag,
- HASH_ENTER, &found);
- if (!lock)
- {
- LWLockRelease(masterLock);
- elog(ERROR, "LockAcquire: lock table %d is out of memory",
- lockmethod);
- return FALSE;
- }
-
- /*
- * if it's a new lock object, initialize it
- */
- if (!found)
- {
- lock->grantMask = 0;
- lock->waitMask = 0;
- SHMQueueInit(&(lock->lockHolders));
- ProcQueueInit(&(lock->waitProcs));
- lock->nRequested = 0;
- lock->nGranted = 0;
- MemSet((char *) lock->requested, 0, sizeof(int) * MAX_LOCKMODES);
- MemSet((char *) lock->granted, 0, sizeof(int) * MAX_LOCKMODES);
- LOCK_PRINT("LockAcquire: new", lock, lockmode);
- }
- else
- {
- LOCK_PRINT("LockAcquire: found", lock, lockmode);
- Assert((lock->nRequested >= 0) && (lock->requested[lockmode] >= 0));
- Assert((lock->nGranted >= 0) && (lock->granted[lockmode] >= 0));
- Assert(lock->nGranted <= lock->nRequested);
- }
-
- /*
- * Create the hash key for the holder table.
- */
- MemSet(&holdertag, 0, sizeof(HOLDERTAG)); /* must clear padding,
- * needed */
- holdertag.lock = MAKE_OFFSET(lock);
- holdertag.proc = MAKE_OFFSET(MyProc);
- TransactionIdStore(xid, &holdertag.xid);
-
- /*
- * Find or create a holder entry with this tag
- */
- holderTable = lockMethodTable->holderHash;
- holder = (HOLDER *) hash_search(holderTable,
- (void *) &holdertag,
- HASH_ENTER, &found);
- if (!holder)
- {
- LWLockRelease(masterLock);
- elog(ERROR, "LockAcquire: holder table out of memory");
- return FALSE;
- }
-
- /*
- * If new, initialize the new entry
- */
- if (!found)
- {
- holder->nHolding = 0;
- MemSet((char *) holder->holding, 0, sizeof(int) * MAX_LOCKMODES);
- /* Add holder to appropriate lists */
- SHMQueueInsertBefore(&lock->lockHolders, &holder->lockLink);
- SHMQueueInsertBefore(&MyProc->procHolders, &holder->procLink);
- HOLDER_PRINT("LockAcquire: new", holder);
- }
- else
- {
- HOLDER_PRINT("LockAcquire: found", holder);
- Assert((holder->nHolding >= 0) && (holder->holding[lockmode] >= 0));
- Assert(holder->nHolding <= lock->nGranted);
-
-#ifdef CHECK_DEADLOCK_RISK
-
- /*
- * Issue warning if we already hold a lower-level lock on this
- * object and do not hold a lock of the requested level or higher.
- * This indicates a deadlock-prone coding practice (eg, we'd have
- * a deadlock if another backend were following the same code path
- * at about the same time).
- *
- * This is not enabled by default, because it may generate log
- * entries about user-level coding practices that are in fact safe
- * in context. It can be enabled to help find system-level
- * problems.
- *
- * XXX Doing numeric comparison on the lockmodes is a hack; it'd be
- * better to use a table. For now, though, this works.
- */
- for (i = lockMethodTable->ctl->numLockModes; i > 0; i--)
- {
- if (holder->holding[i] > 0)
- {
- if (i >= (int) lockmode)
- break; /* safe: we have a lock >= req level */
- elog(LOG, "Deadlock risk: raising lock level"
- " from %s to %s on object %u/%u/%u",
- lock_mode_names[i], lock_mode_names[lockmode],
- lock->tag.relId, lock->tag.dbId, lock->tag.objId.blkno);
- break;
- }
- }
-#endif /* CHECK_DEADLOCK_RISK */
- }
-
- /*
- * lock->nRequested and lock->requested[] count the total number of
- * requests, whether granted or waiting, so increment those
- * immediately. The other counts don't increment till we get the lock.
- */
- lock->nRequested++;
- lock->requested[lockmode]++;
- Assert((lock->nRequested > 0) && (lock->requested[lockmode] > 0));
-
- /*
- * If I already hold one or more locks of the requested type, just
- * grant myself another one without blocking.
- */
- if (holder->holding[lockmode] > 0)
- {
- GrantLock(lock, holder, lockmode);
- HOLDER_PRINT("LockAcquire: owning", holder);
- LWLockRelease(masterLock);
- return TRUE;
- }
-
- /*
- * If this process (under any XID) is a holder of the lock, also grant
- * myself another one without blocking.
- */
- LockCountMyLocks(holder->tag.lock, MyProc, myHolding);
- if (myHolding[lockmode] > 0)
- {
- GrantLock(lock, holder, lockmode);
- HOLDER_PRINT("LockAcquire: my other XID owning", holder);
- LWLockRelease(masterLock);
- return TRUE;
- }
-
- /*
- * If lock requested conflicts with locks requested by waiters, must
- * join wait queue. Otherwise, check for conflict with already-held
- * locks. (That's last because most complex check.)
- */
- if (lockMethodTable->ctl->conflictTab[lockmode] & lock->waitMask)
- status = STATUS_FOUND;
- else
- status = LockCheckConflicts(lockMethodTable, lockmode,
- lock, holder,
- MyProc, myHolding);
-
- if (status == STATUS_OK)
- {
- /* No conflict with held or previously requested locks */
- GrantLock(lock, holder, lockmode);
- }
- else
- {
- Assert(status == STATUS_FOUND);
-
- /*
- * We can't acquire the lock immediately. If caller specified no
- * blocking, remove the holder entry and return FALSE without
- * waiting.
- */
- if (dontWait)
- {
- if (holder->nHolding == 0)
- {
- SHMQueueDelete(&holder->lockLink);
- SHMQueueDelete(&holder->procLink);
- holder = (HOLDER *) hash_search(holderTable,
- (void *) holder,
- HASH_REMOVE, NULL);
- if (!holder)
- elog(WARNING, "LockAcquire: remove holder, table corrupted");
- }
- else
- HOLDER_PRINT("LockAcquire: NHOLDING", holder);
- lock->nRequested--;
- lock->requested[lockmode]--;
- LOCK_PRINT("LockAcquire: conditional lock failed", lock, lockmode);
- Assert((lock->nRequested > 0) && (lock->requested[lockmode] >= 0));
- Assert(lock->nGranted <= lock->nRequested);
- LWLockRelease(masterLock);
- return FALSE;
- }
-
- /*
- * Construct bitmask of locks this process holds on this object.
- */
- {
- int heldLocks = 0;
- int tmpMask;
-
- for (i = 1, tmpMask = 2;
- i <= lockMethodTable->ctl->numLockModes;
- i++, tmpMask <<= 1)
- {
- if (myHolding[i] > 0)
- heldLocks |= tmpMask;
- }
- MyProc->heldLocks = heldLocks;
- }
-
- /*
- * Sleep till someone wakes me up.
- */
- status = WaitOnLock(lockmethod, lockmode, lock, holder);
-
- /*
- * NOTE: do not do any material change of state between here and
- * return. All required changes in locktable state must have been
- * done when the lock was granted to us --- see notes in
- * WaitOnLock.
- */
-
- /*
- * Check the holder entry status, in case something in the ipc
- * communication doesn't work correctly.
- */
- if (!((holder->nHolding > 0) && (holder->holding[lockmode] > 0)))
- {
- HOLDER_PRINT("LockAcquire: INCONSISTENT", holder);
- LOCK_PRINT("LockAcquire: INCONSISTENT", lock, lockmode);
- /* Should we retry ? */
- LWLockRelease(masterLock);
- return FALSE;
- }
- HOLDER_PRINT("LockAcquire: granted", holder);
- LOCK_PRINT("LockAcquire: granted", lock, lockmode);
- }
-
- LWLockRelease(masterLock);
-
- return status == STATUS_OK;
-}
-
-/*
- * LockCheckConflicts -- test whether requested lock conflicts
- * with those already granted
- *
- * Returns STATUS_FOUND if conflict, STATUS_OK if no conflict.
- *
- * NOTES:
- * Here's what makes this complicated: one process's locks don't
- * conflict with one another, even if they are held under different
- * transaction IDs (eg, session and xact locks do not conflict).
- * So, we must subtract off our own locks when determining whether the
- * requested new lock conflicts with those already held.
- *
- * The caller can optionally pass the process's total holding counts, if
- * known. If NULL is passed then these values will be computed internally.
- */
-int
-LockCheckConflicts(LOCKMETHODTABLE *lockMethodTable,
- LOCKMODE lockmode,
- LOCK *lock,
- HOLDER *holder,
- PGPROC *proc,
- int *myHolding) /* myHolding[] array or NULL */
-{
- LOCKMETHODCTL *lockctl = lockMethodTable->ctl;
- int numLockModes = lockctl->numLockModes;
- int bitmask;
- int i,
- tmpMask;
- int localHolding[MAX_LOCKMODES];
-
- /*
- * first check for global conflicts: If no locks conflict with my
- * request, then I get the lock.
- *
- * Checking for conflict: lock->grantMask represents the types of
- * currently held locks. conflictTable[lockmode] has a bit set for
- * each type of lock that conflicts with request. Bitwise compare
- * tells if there is a conflict.
- */
- if (!(lockctl->conflictTab[lockmode] & lock->grantMask))
- {
- HOLDER_PRINT("LockCheckConflicts: no conflict", holder);
- return STATUS_OK;
- }
-
- /*
- * Rats. Something conflicts. But it could still be my own lock. We
- * have to construct a conflict mask that does not reflect our own
- * locks. Locks held by the current process under another XID also
- * count as "our own locks".
- */
- if (myHolding == NULL)
- {
- /* Caller didn't do calculation of total holding for me */
- LockCountMyLocks(holder->tag.lock, proc, localHolding);
- myHolding = localHolding;
- }
-
- /* Compute mask of lock types held by other processes */
- bitmask = 0;
- tmpMask = 2;
- for (i = 1; i <= numLockModes; i++, tmpMask <<= 1)
- {
- if (lock->granted[i] != myHolding[i])
- bitmask |= tmpMask;
- }
-
- /*
- * now check again for conflicts. 'bitmask' describes the types of
- * locks held by other processes. If one of these conflicts with the
- * kind of lock that I want, there is a conflict and I have to sleep.
- */
- if (!(lockctl->conflictTab[lockmode] & bitmask))
- {
- /* no conflict. OK to get the lock */
- HOLDER_PRINT("LockCheckConflicts: resolved", holder);
- return STATUS_OK;
- }
-
- HOLDER_PRINT("LockCheckConflicts: conflicting", holder);
- return STATUS_FOUND;
-}
-
-/*
- * LockCountMyLocks --- Count total number of locks held on a given lockable
- * object by a given process (under any transaction ID).
- *
- * XXX This could be rather slow if the process holds a large number of locks.
- * Perhaps it could be sped up if we kept yet a third hashtable of per-
- * process lock information. However, for the normal case where a transaction
- * doesn't hold a large number of locks, keeping such a table would probably
- * be a net slowdown.
- */
-static void
-LockCountMyLocks(SHMEM_OFFSET lockOffset, PGPROC *proc, int *myHolding)
-{
- SHM_QUEUE *procHolders = &(proc->procHolders);
- HOLDER *holder;
- int i;
-
- MemSet(myHolding, 0, MAX_LOCKMODES * sizeof(int));
-
- holder = (HOLDER *) SHMQueueNext(procHolders, procHolders,
- offsetof(HOLDER, procLink));
-
- while (holder)
- {
- if (lockOffset == holder->tag.lock)
- {
- for (i = 1; i < MAX_LOCKMODES; i++)
- myHolding[i] += holder->holding[i];
- }
-
- holder = (HOLDER *) SHMQueueNext(procHolders, &holder->procLink,
- offsetof(HOLDER, procLink));
- }
-}
-
-/*
- * GrantLock -- update the lock and holder data structures to show
- * the lock request has been granted.
- *
- * NOTE: if proc was blocked, it also needs to be removed from the wait list
- * and have its waitLock/waitHolder fields cleared. That's not done here.
- */
-void
-GrantLock(LOCK *lock, HOLDER *holder, LOCKMODE lockmode)
-{
- lock->nGranted++;
- lock->granted[lockmode]++;
- lock->grantMask |= BITS_ON[lockmode];
- if (lock->granted[lockmode] == lock->requested[lockmode])
- lock->waitMask &= BITS_OFF[lockmode];
- LOCK_PRINT("GrantLock", lock, lockmode);
- Assert((lock->nGranted > 0) && (lock->granted[lockmode] > 0));
- Assert(lock->nGranted <= lock->nRequested);
- holder->holding[lockmode]++;
- holder->nHolding++;
- Assert((holder->nHolding > 0) && (holder->holding[lockmode] > 0));
-}
-
-/*
- * WaitOnLock -- wait to acquire a lock
- *
- * Caller must have set MyProc->heldLocks to reflect locks already held
- * on the lockable object by this process (under all XIDs).
- *
- * The locktable's masterLock must be held at entry.
- */
-static int
-WaitOnLock(LOCKMETHOD lockmethod, LOCKMODE lockmode,
- LOCK *lock, HOLDER *holder)
-{
- LOCKMETHODTABLE *lockMethodTable = LockMethodTable[lockmethod];
- char *new_status,
- *old_status;
-
- Assert(lockmethod < NumLockMethods);
-
- LOCK_PRINT("WaitOnLock: sleeping on lock", lock, lockmode);
-
- old_status = pstrdup(get_ps_display());
- new_status = (char *) palloc(strlen(old_status) + 10);
- strcpy(new_status, old_status);
- strcat(new_status, " waiting");
- set_ps_display(new_status);
-
- /*
- * NOTE: Think not to put any shared-state cleanup after the call to
- * ProcSleep, in either the normal or failure path. The lock state
- * must be fully set by the lock grantor, or by HandleDeadLock if we
- * give up waiting for the lock. This is necessary because of the
- * possibility that a cancel/die interrupt will interrupt ProcSleep
- * after someone else grants us the lock, but before we've noticed it.
- * Hence, after granting, the locktable state must fully reflect the
- * fact that we own the lock; we can't do additional work on return.
- * Contrariwise, if we fail, any cleanup must happen in xact abort
- * processing, not here, to ensure it will also happen in the
- * cancel/die case.
- */
-
- if (ProcSleep(lockMethodTable,
- lockmode,
- lock,
- holder) != STATUS_OK)
- {
- /*
- * We failed as a result of a deadlock, see HandleDeadLock(). Quit
- * now. Removal of the holder and lock objects, if no longer
- * needed, will happen in xact cleanup (see above for motivation).
- */
- LOCK_PRINT("WaitOnLock: aborting on lock", lock, lockmode);
- LWLockRelease(lockMethodTable->ctl->masterLock);
- elog(ERROR, "deadlock detected");
- /* not reached */
- }
-
- set_ps_display(old_status);
- pfree(old_status);
- pfree(new_status);
-
- LOCK_PRINT("WaitOnLock: wakeup on lock", lock, lockmode);
- return STATUS_OK;
-}
-
-/*
- * Remove a proc from the wait-queue it is on
- * (caller must know it is on one).
- *
- * Locktable lock must be held by caller.
- *
- * NB: this does not remove the process' holder object, nor the lock object,
- * even though their counts might now have gone to zero. That will happen
- * during a subsequent LockReleaseAll call, which we expect will happen
- * during transaction cleanup. (Removal of a proc from its wait queue by
- * this routine can only happen if we are aborting the transaction.)
- */
-void
-RemoveFromWaitQueue(PGPROC *proc)
-{
- LOCK *waitLock = proc->waitLock;
- LOCKMODE lockmode = proc->waitLockMode;
-
- /* Make sure proc is waiting */
- Assert(proc->links.next != INVALID_OFFSET);
- Assert(waitLock);
- Assert(waitLock->waitProcs.size > 0);
-
- /* Remove proc from lock's wait queue */
- SHMQueueDelete(&(proc->links));
- waitLock->waitProcs.size--;
-
- /* Undo increments of request counts by waiting process */
- Assert(waitLock->nRequested > 0);
- Assert(waitLock->nRequested > proc->waitLock->nGranted);
- waitLock->nRequested--;
- Assert(waitLock->requested[lockmode] > 0);
- waitLock->requested[lockmode]--;
- /* don't forget to clear waitMask bit if appropriate */
- if (waitLock->granted[lockmode] == waitLock->requested[lockmode])
- waitLock->waitMask &= BITS_OFF[lockmode];
-
- /* Clean up the proc's own state */
- proc->waitLock = NULL;
- proc->waitHolder = NULL;
-
- /* See if any other waiters for the lock can be woken up now */
- ProcLockWakeup(GetLocksMethodTable(waitLock), waitLock);
-}
-
-/*
- * LockRelease -- look up 'locktag' in lock table 'lockmethod' and
- * release one 'lockmode' lock on it.
- *
- * Side Effects: find any waiting processes that are now wakable,
- * grant them their requested locks and awaken them.
- * (We have to grant the lock here to avoid a race between
- * the waking process and any new process to
- * come along and request the lock.)
- */
-bool
-LockRelease(LOCKMETHOD lockmethod, LOCKTAG *locktag,
- TransactionId xid, LOCKMODE lockmode)
-{
- LOCK *lock;
- LWLockId masterLock;
- LOCKMETHODTABLE *lockMethodTable;
- HOLDER *holder;
- HOLDERTAG holdertag;
- HTAB *holderTable;
- bool wakeupNeeded = false;
-
-#ifdef LOCK_DEBUG
- if (lockmethod == USER_LOCKMETHOD && Trace_userlocks)
- elog(LOG, "LockRelease: user lock tag [%u] %d", locktag->objId.blkno, lockmode);
-#endif
-
- /* ???????? This must be changed when short term locks will be used */
- locktag->lockmethod = lockmethod;
-
- Assert(lockmethod < NumLockMethods);
- lockMethodTable = LockMethodTable[lockmethod];
- if (!lockMethodTable)
- {
- elog(WARNING, "lockMethodTable is null in LockRelease");
- return FALSE;
- }
-
- masterLock = lockMethodTable->ctl->masterLock;
- LWLockAcquire(masterLock, LW_EXCLUSIVE);
-
- /*
- * Find a lock with this tag
- */
- Assert(lockMethodTable->lockHash->hash == tag_hash);
- lock = (LOCK *) hash_search(lockMethodTable->lockHash,
- (void *) locktag,
- HASH_FIND, NULL);
-
- /*
- * let the caller print its own error message, too. Do not
- * elog(ERROR).
- */
- if (!lock)
- {
- LWLockRelease(masterLock);
- elog(WARNING, "LockRelease: no such lock");
- return FALSE;
- }
- LOCK_PRINT("LockRelease: found", lock, lockmode);
-
- /*
- * Find the holder entry for this holder.
- */
- MemSet(&holdertag, 0, sizeof(HOLDERTAG)); /* must clear padding,
- * needed */
- holdertag.lock = MAKE_OFFSET(lock);
- holdertag.proc = MAKE_OFFSET(MyProc);
- TransactionIdStore(xid, &holdertag.xid);
-
- holderTable = lockMethodTable->holderHash;
- holder = (HOLDER *) hash_search(holderTable,
- (void *) &holdertag,
- HASH_FIND_SAVE, NULL);
- if (!holder)
- {
- LWLockRelease(masterLock);
-#ifdef USER_LOCKS
- if (lockmethod == USER_LOCKMETHOD)
- elog(WARNING, "LockRelease: no lock with this tag");
- else
-#endif
- elog(WARNING, "LockRelease: holder table corrupted");
- return FALSE;
- }
- HOLDER_PRINT("LockRelease: found", holder);
-
- /*
- * Check that we are actually holding a lock of the type we want to
- * release.
- */
- if (!(holder->holding[lockmode] > 0))
- {
- HOLDER_PRINT("LockRelease: WRONGTYPE", holder);
- Assert(holder->holding[lockmode] >= 0);
- LWLockRelease(masterLock);
- elog(WARNING, "LockRelease: you don't own a lock of type %s",
- lock_mode_names[lockmode]);
- return FALSE;
- }
- Assert(holder->nHolding > 0);
- Assert((lock->nRequested > 0) && (lock->requested[lockmode] > 0));
- Assert((lock->nGranted > 0) && (lock->granted[lockmode] > 0));
- Assert(lock->nGranted <= lock->nRequested);
-
- /*
- * fix the general lock stats
- */
- lock->nRequested--;
- lock->requested[lockmode]--;
- lock->nGranted--;
- lock->granted[lockmode]--;
-
- if (lock->granted[lockmode] == 0)
- {
- /* change the conflict mask. No more of this lock type. */
- lock->grantMask &= BITS_OFF[lockmode];
- }
-
- LOCK_PRINT("LockRelease: updated", lock, lockmode);
- Assert((lock->nRequested >= 0) && (lock->requested[lockmode] >= 0));
- Assert((lock->nGranted >= 0) && (lock->granted[lockmode] >= 0));
- Assert(lock->nGranted <= lock->nRequested);
-
- /*
- * We need only run ProcLockWakeup if the released lock conflicts with
- * at least one of the lock types requested by waiter(s). Otherwise
- * whatever conflict made them wait must still exist. NOTE: before
- * MVCC, we could skip wakeup if lock->granted[lockmode] was still
- * positive. But that's not true anymore, because the remaining
- * granted locks might belong to some waiter, who could now be
- * awakened because he doesn't conflict with his own locks.
- */
- if (lockMethodTable->ctl->conflictTab[lockmode] & lock->waitMask)
- wakeupNeeded = true;
-
- if (lock->nRequested == 0)
- {
- /*
- * if there's no one waiting in the queue, we just released the
- * last lock on this object. Delete it from the lock table.
- */
- Assert(lockMethodTable->lockHash->hash == tag_hash);
- lock = (LOCK *) hash_search(lockMethodTable->lockHash,
- (void *) &(lock->tag),
- HASH_REMOVE,
- NULL);
- if (!lock)
- {
- LWLockRelease(masterLock);
- elog(WARNING, "LockRelease: remove lock, table corrupted");
- return FALSE;
- }
- wakeupNeeded = false; /* should be false, but make sure */
- }
-
- /*
- * Now fix the per-holder lock stats.
- */
- holder->holding[lockmode]--;
- holder->nHolding--;
- HOLDER_PRINT("LockRelease: updated", holder);
- Assert((holder->nHolding >= 0) && (holder->holding[lockmode] >= 0));
-
- /*
- * If this was my last hold on this lock, delete my entry in the
- * holder table.
- */
- if (holder->nHolding == 0)
- {
- HOLDER_PRINT("LockRelease: deleting", holder);
- SHMQueueDelete(&holder->lockLink);
- SHMQueueDelete(&holder->procLink);
- holder = (HOLDER *) hash_search(holderTable,
- (void *) &holder,
- HASH_REMOVE_SAVED, NULL);
- if (!holder)
- {
- LWLockRelease(masterLock);
- elog(WARNING, "LockRelease: remove holder, table corrupted");
- return FALSE;
- }
- }
-
- /*
- * Wake up waiters if needed.
- */
- if (wakeupNeeded)
- ProcLockWakeup(lockMethodTable, lock);
-
- LWLockRelease(masterLock);
- return TRUE;
-}
-
-/*
- * LockReleaseAll -- Release all locks in a process's lock list.
- *
- * Well, not really *all* locks.
- *
- * If 'allxids' is TRUE, all locks of the specified lock method are
- * released, regardless of transaction affiliation.
- *
- * If 'allxids' is FALSE, all locks of the specified lock method and
- * specified XID are released.
- */
-bool
-LockReleaseAll(LOCKMETHOD lockmethod, PGPROC *proc,
- bool allxids, TransactionId xid)
-{
- SHM_QUEUE *procHolders = &(proc->procHolders);
- HOLDER *holder;
- HOLDER *nextHolder;
- LWLockId masterLock;
- LOCKMETHODTABLE *lockMethodTable;
- int i,
- numLockModes;
- LOCK *lock;
-
-#ifdef LOCK_DEBUG
- if (lockmethod == USER_LOCKMETHOD ? Trace_userlocks : Trace_locks)
- elog(LOG, "LockReleaseAll: lockmethod=%d, pid=%d",
- lockmethod, proc->pid);
-#endif
-
- Assert(lockmethod < NumLockMethods);
- lockMethodTable = LockMethodTable[lockmethod];
- if (!lockMethodTable)
- {
- elog(WARNING, "LockReleaseAll: bad lockmethod %d", lockmethod);
- return FALSE;
- }
-
- numLockModes = lockMethodTable->ctl->numLockModes;
- masterLock = lockMethodTable->ctl->masterLock;
-
- LWLockAcquire(masterLock, LW_EXCLUSIVE);
-
- holder = (HOLDER *) SHMQueueNext(procHolders, procHolders,
- offsetof(HOLDER, procLink));
-
- while (holder)
- {
- bool wakeupNeeded = false;
-
- /* Get link first, since we may unlink/delete this holder */
- nextHolder = (HOLDER *) SHMQueueNext(procHolders, &holder->procLink,
- offsetof(HOLDER, procLink));
-
- Assert(holder->tag.proc == MAKE_OFFSET(proc));
-
- lock = (LOCK *) MAKE_PTR(holder->tag.lock);
-
- /* Ignore items that are not of the lockmethod to be removed */
- if (LOCK_LOCKMETHOD(*lock) != lockmethod)
- goto next_item;
-
- /* If not allxids, ignore items that are of the wrong xid */
- if (!allxids && !TransactionIdEquals(xid, holder->tag.xid))
- goto next_item;
-
- HOLDER_PRINT("LockReleaseAll", holder);
- LOCK_PRINT("LockReleaseAll", lock, 0);
- Assert(lock->nRequested >= 0);
- Assert(lock->nGranted >= 0);
- Assert(lock->nGranted <= lock->nRequested);
- Assert(holder->nHolding >= 0);
- Assert(holder->nHolding <= lock->nRequested);
-
- /*
- * fix the general lock stats
- */
- if (lock->nRequested != holder->nHolding)
- {
- for (i = 1; i <= numLockModes; i++)
- {
- Assert(holder->holding[i] >= 0);
- if (holder->holding[i] > 0)
- {
- lock->requested[i] -= holder->holding[i];
- lock->granted[i] -= holder->holding[i];
- Assert(lock->requested[i] >= 0 && lock->granted[i] >= 0);
- if (lock->granted[i] == 0)
- lock->grantMask &= BITS_OFF[i];
-
- /*
- * Read comments in LockRelease
- */
- if (!wakeupNeeded &&
- lockMethodTable->ctl->conflictTab[i] & lock->waitMask)
- wakeupNeeded = true;
- }
- }
- lock->nRequested -= holder->nHolding;
- lock->nGranted -= holder->nHolding;
- Assert((lock->nRequested >= 0) && (lock->nGranted >= 0));
- Assert(lock->nGranted <= lock->nRequested);
- }
- else
- {
- /*
- * This holder accounts for all the requested locks on the
- * object, so we can be lazy and just zero things out.
- */
- lock->nRequested = 0;
- lock->nGranted = 0;
- /* Fix the lock status, just for next LOCK_PRINT message. */
- for (i = 1; i <= numLockModes; i++)
- {
- Assert(lock->requested[i] == lock->granted[i]);
- lock->requested[i] = lock->granted[i] = 0;
- }
- }
- LOCK_PRINT("LockReleaseAll: updated", lock, 0);
-
- HOLDER_PRINT("LockReleaseAll: deleting", holder);
-
- /*
- * Remove the holder entry from the linked lists
- */
- SHMQueueDelete(&holder->lockLink);
- SHMQueueDelete(&holder->procLink);
-
- /*
- * remove the holder entry from the hashtable
- */
- holder = (HOLDER *) hash_search(lockMethodTable->holderHash,
- (void *) holder,
- HASH_REMOVE,
- NULL);
- if (!holder)
- {
- LWLockRelease(masterLock);
- elog(WARNING, "LockReleaseAll: holder table corrupted");
- return FALSE;
- }
-
- if (lock->nRequested == 0)
- {
- /*
- * We've just released the last lock, so garbage-collect the
- * lock object.
- */
- LOCK_PRINT("LockReleaseAll: deleting", lock, 0);
- Assert(lockMethodTable->lockHash->hash == tag_hash);
- lock = (LOCK *) hash_search(lockMethodTable->lockHash,
- (void *) &(lock->tag),
- HASH_REMOVE, NULL);
- if (!lock)
- {
- LWLockRelease(masterLock);
- elog(WARNING, "LockReleaseAll: cannot remove lock from HTAB");
- return FALSE;
- }
- }
- else if (wakeupNeeded)
- ProcLockWakeup(lockMethodTable, lock);
-
-next_item:
- holder = nextHolder;
- }
-
- LWLockRelease(masterLock);
-
-#ifdef LOCK_DEBUG
- if (lockmethod == USER_LOCKMETHOD ? Trace_userlocks : Trace_locks)
- elog(LOG, "LockReleaseAll: done");
-#endif
-
- return TRUE;
-}
-
-int
-LockShmemSize(int maxBackends)
-{
- int size = 0;
- long max_table_size = NLOCKENTS(maxBackends);
-
- size += MAXALIGN(sizeof(PROC_HDR)); /* ProcGlobal */
- size += maxBackends * MAXALIGN(sizeof(PGPROC)); /* each MyProc */
- size += MAX_LOCK_METHODS * MAXALIGN(sizeof(LOCKMETHODCTL)); /* each
- * lockMethodTable->ctl */
-
- /* lockHash table */
- size += hash_estimate_size(max_table_size, sizeof(LOCK));
-
- /* holderHash table */
- size += hash_estimate_size(max_table_size, sizeof(HOLDER));
-
- /*
- * Since the lockHash entry count above is only an estimate, add 10%
- * safety margin.
- */
- size += size / 10;
-
- return size;
-}
-
-
-#ifdef LOCK_DEBUG
-/*
- * Dump all locks in the proc->procHolders list.
- *
- * Must have already acquired the masterLock.
- */
-void
-DumpLocks(void)
-{
- PGPROC *proc;
- SHM_QUEUE *procHolders;
- HOLDER *holder;
- LOCK *lock;
- int lockmethod = DEFAULT_LOCKMETHOD;
- LOCKMETHODTABLE *lockMethodTable;
-
- proc = MyProc;
- if (proc == NULL)
- return;
-
- procHolders = &proc->procHolders;
-
- Assert(lockmethod < NumLockMethods);
- lockMethodTable = LockMethodTable[lockmethod];
- if (!lockMethodTable)
- return;
-
- if (proc->waitLock)
- LOCK_PRINT("DumpLocks: waiting on", proc->waitLock, 0);
-
- holder = (HOLDER *) SHMQueueNext(procHolders, procHolders,
- offsetof(HOLDER, procLink));
-
- while (holder)
- {
- Assert(holder->tag.proc == MAKE_OFFSET(proc));
-
- lock = (LOCK *) MAKE_PTR(holder->tag.lock);
-
- HOLDER_PRINT("DumpLocks", holder);
- LOCK_PRINT("DumpLocks", lock, 0);
-
- holder = (HOLDER *) SHMQueueNext(procHolders, &holder->procLink,
- offsetof(HOLDER, procLink));
- }
-}
-
-/*
- * Dump all postgres locks. Must have already acquired the masterLock.
- */
-void
-DumpAllLocks(void)
-{
- PGPROC *proc;
- HOLDER *holder;
- LOCK *lock;
- int lockmethod = DEFAULT_LOCKMETHOD;
- LOCKMETHODTABLE *lockMethodTable;
- HTAB *holderTable;
- HASH_SEQ_STATUS status;
-
- proc = MyProc;
- if (proc == NULL)
- return;
-
- Assert(lockmethod < NumLockMethods);
- lockMethodTable = LockMethodTable[lockmethod];
- if (!lockMethodTable)
- return;
-
- holderTable = lockMethodTable->holderHash;
-
- if (proc->waitLock)
- LOCK_PRINT("DumpAllLocks: waiting on", proc->waitLock, 0);
-
- hash_seq_init(&status, holderTable);
- while ((holder = (HOLDER *) hash_seq_search(&status)) != NULL)
- {
- HOLDER_PRINT("DumpAllLocks", holder);
-
- if (holder->tag.lock)
- {
- lock = (LOCK *) MAKE_PTR(holder->tag.lock);
- LOCK_PRINT("DumpAllLocks", lock, 0);
- }
- else
- elog(LOG, "DumpAllLocks: holder->tag.lock = NULL");
- }
-}
-
-#endif /* LOCK_DEBUG */