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author | CVS to git conversion script <webmaster@postgresql.org> | 2002-06-20 20:29:55 +0000 |
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committer | CVS to git conversion script <webmaster@postgresql.org> | 2002-06-20 20:29:55 +0000 |
commit | 05dedace84ef8c93fea5309c3ac55f889011429b (patch) | |
tree | 4c7f513afbbc03060039a165d1770e11be711773 /src/backend/storage/lmgr/lock.c | |
parent | d84fe82230c593f3dc5d7f427849b99d1efa8a0a (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.'
Delete:
COPYRIGHT
GNUmakefile.in
HISTORY
INSTALL
Makefile
README
aclocal.m4
config/ac_func_accept_argtypes.m4
config/c-compiler.m4
config/c-library.m4
config/config.guess
config/config.sub
config/cxx.m4
config/docbook.m4
config/general.m4
config/install-sh
config/java.m4
config/libtool.m4
config/missing
config/mkinstalldirs
config/perl.m4
config/prep_buildtree
config/programs.m4
config/python.m4
config/tcl.m4
configure
configure.in
contrib/Makefile
contrib/README
contrib/array/Makefile
contrib/array/README.array_iterator
contrib/array/array_iterator.c
contrib/array/array_iterator.h
contrib/array/array_iterator.sql.in
contrib/btree_gist/Makefile
contrib/btree_gist/README.btree_gist
contrib/btree_gist/btree_gist.c
contrib/btree_gist/btree_gist.sql.in
contrib/btree_gist/data/test_btree.data
contrib/btree_gist/data/test_btree_ts.data
contrib/btree_gist/expected/btree_gist.out
contrib/btree_gist/sql/btree_gist.sql
contrib/chkpass/Makefile
contrib/chkpass/README.chkpass
contrib/chkpass/chkpass.c
contrib/chkpass/chkpass.sql.in
contrib/contrib-global.mk
contrib/cube/Makefile
contrib/cube/README.cube
contrib/cube/buffer.c
contrib/cube/buffer.h
contrib/cube/cube.c
contrib/cube/cube.sql.in
contrib/cube/cubedata.h
contrib/cube/cubeparse.y
contrib/cube/cubescan.l
contrib/cube/data/test_cube.data
contrib/cube/expected/cube.out
contrib/cube/sql/cube.sql
contrib/dbase/Makefile
contrib/dbase/README.dbf2pg
contrib/dbase/dbf.c
contrib/dbase/dbf.h
contrib/dbase/dbf2pg.1
contrib/dbase/dbf2pg.c
contrib/dbase/endian.c
contrib/dblink/Makefile
contrib/dblink/README.dblink
contrib/dblink/dblink.c
contrib/dblink/dblink.h
contrib/dblink/dblink.sql.in
contrib/dbsize/Makefile
contrib/dbsize/README.dbsize
contrib/dbsize/dbsize.c
contrib/dbsize/dbsize.sql.in
contrib/earthdistance/Makefile
contrib/earthdistance/README.earthdistance
contrib/earthdistance/earthdistance.c
contrib/earthdistance/earthdistance.sql.in
contrib/findoidjoins/Makefile
contrib/findoidjoins/README.findoidjoins
contrib/findoidjoins/findoidjoins.c
contrib/findoidjoins/make_oidjoins_check
contrib/fulltextindex/Makefile
contrib/fulltextindex/README.fti
contrib/fulltextindex/TODO
contrib/fulltextindex/fti.c
contrib/fulltextindex/fti.pl
contrib/fulltextindex/fti.sql.in
contrib/fulltextindex/timings.sh
contrib/fuzzystrmatch/Makefile
contrib/fuzzystrmatch/README.fuzzystrmatch
contrib/fuzzystrmatch/README.soundex
contrib/fuzzystrmatch/fuzzystrmatch.c
contrib/fuzzystrmatch/fuzzystrmatch.h
contrib/fuzzystrmatch/fuzzystrmatch.sql.in
contrib/intagg/Makefile
contrib/intagg/README.int_aggregate
contrib/intagg/int_aggregate.c
contrib/intagg/int_aggregate.sql.in
contrib/intarray/Makefile
contrib/intarray/README.intarray
contrib/intarray/_int.c
contrib/intarray/_int.sql.in
contrib/intarray/bench/bench.pl
contrib/intarray/bench/create_test.pl
contrib/intarray/data/test__int.data
contrib/intarray/expected/_int.out
contrib/intarray/sql/_int.sql
contrib/ipc_check/README
contrib/ipc_check/ipc_check.pl
contrib/isbn_issn/Makefile
contrib/isbn_issn/README.isbn_issn
contrib/isbn_issn/isbn_issn.c
contrib/isbn_issn/isbn_issn.sql.in
contrib/lo/Makefile
contrib/lo/README.lo
contrib/lo/lo.c
contrib/lo/lo.sql.in
contrib/lo/lo_drop.sql
contrib/lo/lo_test.sql
contrib/mSQL-interface/Makefile
contrib/mSQL-interface/README.mpgsql
contrib/mSQL-interface/mpgsql.c
contrib/mac/README.mac
contrib/mac/createoui
contrib/mac/dropoui
contrib/mac/ouiparse.awk
contrib/mac/updateoui
contrib/miscutil/Makefile
contrib/miscutil/README.misc_utils
contrib/miscutil/misc_utils.c
contrib/miscutil/misc_utils.h
contrib/miscutil/misc_utils.sql.in
contrib/mysql/README
contrib/mysql/my2pg.pl
contrib/mysql/mysql2pgsql
contrib/noupdate/Makefile
contrib/noupdate/README.noup
contrib/noupdate/noup.c
contrib/noupdate/noup.sql.in
contrib/oid2name/Makefile
contrib/oid2name/README.oid2name
contrib/oid2name/oid2name.c
contrib/oracle/CHANGES
contrib/oracle/Ora2Pg.pm
contrib/oracle/README.ora2pg
contrib/oracle/TODO
contrib/oracle/ora2pg.html
contrib/oracle/ora2pg.pl
contrib/pg_controldata/Makefile
contrib/pg_controldata/README.pg_controldata
contrib/pg_controldata/pg_controldata.c
contrib/pg_dumplo/Makefile
contrib/pg_dumplo/README.pg_dumplo
contrib/pg_dumplo/lo_export.c
contrib/pg_dumplo/lo_import.c
contrib/pg_dumplo/main.c
contrib/pg_dumplo/pg_dumplo.h
contrib/pg_dumplo/utils.c
contrib/pg_logger/Makefile
contrib/pg_logger/README.pg_logger
contrib/pg_logger/pg_logger.c
contrib/pg_resetxlog/Makefile
contrib/pg_resetxlog/README.pg_resetxlog
contrib/pg_resetxlog/pg_resetxlog.c
contrib/pg_upgrade/README
contrib/pg_upgrade/pg_upgrade
contrib/pg_upgrade/pg_upgrade.1
contrib/pgbench/Makefile
contrib/pgbench/README.pgbench
contrib/pgbench/README.pgbench_jis
contrib/pgbench/pgbench.c
contrib/pgcrypto/API
contrib/pgcrypto/Makefile
contrib/pgcrypto/README.pgcrypto
contrib/pgcrypto/blf.c
contrib/pgcrypto/blf.h
contrib/pgcrypto/crypt-blowfish.c
contrib/pgcrypto/crypt-des.c
contrib/pgcrypto/crypt-gensalt.c
contrib/pgcrypto/crypt-md5.c
contrib/pgcrypto/expected/blowfish.out
contrib/pgcrypto/expected/crypt-blowfish.out
contrib/pgcrypto/expected/crypt-des.out
contrib/pgcrypto/expected/crypt-md5.out
contrib/pgcrypto/expected/crypt-xdes.out
contrib/pgcrypto/expected/hmac-md5.out
contrib/pgcrypto/expected/hmac-sha1.out
contrib/pgcrypto/expected/init.out
contrib/pgcrypto/expected/md5.out
contrib/pgcrypto/expected/rijndael.out
contrib/pgcrypto/expected/sha1.out
contrib/pgcrypto/internal.c
contrib/pgcrypto/md5.c
contrib/pgcrypto/md5.h
contrib/pgcrypto/mhash.c
contrib/pgcrypto/misc.c
contrib/pgcrypto/openssl.c
contrib/pgcrypto/pgcrypto.c
contrib/pgcrypto/pgcrypto.h
contrib/pgcrypto/pgcrypto.sql.in
contrib/pgcrypto/px-crypt.c
contrib/pgcrypto/px-crypt.h
contrib/pgcrypto/px-hmac.c
contrib/pgcrypto/px.c
contrib/pgcrypto/px.h
contrib/pgcrypto/random.c
contrib/pgcrypto/rijndael.c
contrib/pgcrypto/rijndael.h
contrib/pgcrypto/rijndael.tbl
contrib/pgcrypto/sha1.c
contrib/pgcrypto/sha1.h
contrib/pgcrypto/sql/blowfish.sql
contrib/pgcrypto/sql/crypt-blowfish.sql
contrib/pgcrypto/sql/crypt-des.sql
contrib/pgcrypto/sql/crypt-md5.sql
contrib/pgcrypto/sql/crypt-xdes.sql
contrib/pgcrypto/sql/hmac-md5.sql
contrib/pgcrypto/sql/hmac-sha1.sql
contrib/pgcrypto/sql/init.sql
contrib/pgcrypto/sql/md5.sql
contrib/pgcrypto/sql/rijndael.sql
contrib/pgcrypto/sql/sha1.sql
contrib/pgstattuple/Makefile
contrib/pgstattuple/README.pgstattuple
contrib/pgstattuple/README.pgstattuple.euc_jp
contrib/pgstattuple/pgstattuple.c
contrib/pgstattuple/pgstattuple.sql.in
contrib/retep/CHANGELOG
contrib/retep/Implementation
contrib/retep/Makefile
contrib/retep/README
contrib/retep/build.xml
contrib/retep/data/cds.dtd
contrib/retep/data/cds.xml
contrib/retep/retep.jpx
contrib/retep/uk/org/retep/dtu/DCollection.java
contrib/retep/uk/org/retep/dtu/DConstants.java
contrib/retep/uk/org/retep/dtu/DElement.java
contrib/retep/uk/org/retep/dtu/DEnvironment.java
contrib/retep/uk/org/retep/dtu/DModule.java
contrib/retep/uk/org/retep/dtu/DModuleXML.java
contrib/retep/uk/org/retep/dtu/DNode.java
contrib/retep/uk/org/retep/dtu/DProcessor.java
contrib/retep/uk/org/retep/dtu/DTransform.java
contrib/retep/uk/org/retep/tools/Tool.java
contrib/retep/uk/org/retep/tools.properties
contrib/retep/uk/org/retep/util/ExceptionDialog.java
contrib/retep/uk/org/retep/util/Globals.java
contrib/retep/uk/org/retep/util/Logger.java
contrib/retep/uk/org/retep/util/Main.java
contrib/retep/uk/org/retep/util/StandaloneApp.java
contrib/retep/uk/org/retep/util/hba/Editor.java
contrib/retep/uk/org/retep/util/hba/Main.java
contrib/retep/uk/org/retep/util/hba/Record.java
contrib/retep/uk/org/retep/util/misc/IPAddress.java
contrib/retep/uk/org/retep/util/misc/PropertiesIO.java
contrib/retep/uk/org/retep/util/misc/WStringTokenizer.java
contrib/retep/uk/org/retep/util/models/HBATableModel.java
contrib/retep/uk/org/retep/util/models/PropertiesTableModel.java
contrib/retep/uk/org/retep/util/proped/Main.java
contrib/retep/uk/org/retep/util/proped/PropertyEditor.java
contrib/retep/uk/org/retep/xml/core/XMLFactory.java
contrib/retep/uk/org/retep/xml/core/XMLFactoryException.java
contrib/retep/uk/org/retep/xml/jdbc/XMLDatabase.java
contrib/retep/uk/org/retep/xml/jdbc/XMLResultSet.java
contrib/retep/uk/org/retep/xml/parser/TagHandler.java
contrib/retep/uk/org/retep/xml/parser/TagListener.java
contrib/retep/uk/org/retep/xml/test/XMLExport.java
contrib/rserv/ApplySnapshot.in
contrib/rserv/CleanLog.in
contrib/rserv/GetSyncID.in
contrib/rserv/InitRservTest.in
contrib/rserv/Makefile
contrib/rserv/MasterAddTable.in
contrib/rserv/MasterInit.in
contrib/rserv/MasterSync.in
contrib/rserv/PrepareSnapshot.in
contrib/rserv/README.rserv
contrib/rserv/RServ.pm
contrib/rserv/Replicate.in
contrib/rserv/RservTest.in
contrib/rserv/SlaveAddTable.in
contrib/rserv/SlaveInit.in
contrib/rserv/master.sql.in
contrib/rserv/regress.sh
contrib/rserv/rserv.c
contrib/rserv/slave.sql.in
contrib/rtree_gist/Makefile
contrib/rtree_gist/README.rtree_gist
contrib/rtree_gist/bench/bench.pl
contrib/rtree_gist/bench/create_test.pl
contrib/rtree_gist/data/test_box.data
contrib/rtree_gist/expected/rtree_gist.out
contrib/rtree_gist/rtree_gist.c
contrib/rtree_gist/rtree_gist.sql.in
contrib/rtree_gist/sql/rtree_gist.sql
contrib/seg/Makefile
contrib/seg/README.seg
contrib/seg/buffer.c
contrib/seg/buffer.h
contrib/seg/data/test_seg.data
contrib/seg/expected/seg.out
contrib/seg/seg-validate.pl
contrib/seg/seg.c
contrib/seg/seg.sql.in
contrib/seg/segdata.h
contrib/seg/segparse.y
contrib/seg/segscan.l
contrib/seg/sort-segments.pl
contrib/seg/sql/seg.sql
contrib/spi/Makefile
contrib/spi/README.spi
contrib/spi/autoinc.c
contrib/spi/autoinc.example
contrib/spi/autoinc.sql.in
contrib/spi/insert_username.c
contrib/spi/insert_username.example
contrib/spi/insert_username.sql.in
contrib/spi/moddatetime.c
contrib/spi/moddatetime.example
contrib/spi/moddatetime.sql.in
contrib/spi/preprocessor/README.MAX
contrib/spi/preprocessor/example.sql
contrib/spi/preprocessor/step1.c
contrib/spi/preprocessor/step1.e
contrib/spi/preprocessor/step2.pl
contrib/spi/refint.c
contrib/spi/refint.example
contrib/spi/refint.sql.in
contrib/spi/timetravel.c
contrib/spi/timetravel.example
contrib/spi/timetravel.sql.in
contrib/start-scripts/freebsd
contrib/start-scripts/linux
contrib/string/Makefile
contrib/string/README.string_io
contrib/string/string_io.c
contrib/string/string_io.h
contrib/string/string_io.sql.in
contrib/tips/Makefile
contrib/tips/README.apachelog
contrib/tools/add-emacs-variables
contrib/tools/find-sources
contrib/tools/make-tags
contrib/tsearch/Makefile
contrib/tsearch/README.tsearch
contrib/tsearch/crc32.c
contrib/tsearch/crc32.h
contrib/tsearch/data/test_tsearch.data
contrib/tsearch/deflex.h
contrib/tsearch/dict/porter_english.dct
contrib/tsearch/dict/russian_stemming.dct
contrib/tsearch/dict.h
contrib/tsearch/expected/tsearch.out
contrib/tsearch/gistidx.c
contrib/tsearch/gistidx.h
contrib/tsearch/makedict/makedict.pl
contrib/tsearch/morph.c
contrib/tsearch/morph.h
contrib/tsearch/parser.h
contrib/tsearch/parser.l
contrib/tsearch/query.c
contrib/tsearch/query.h
contrib/tsearch/rewrite.c
contrib/tsearch/rewrite.h
contrib/tsearch/sql/tsearch.sql
contrib/tsearch/tsearch.sql.in
contrib/tsearch/txtidx.c
contrib/tsearch/txtidx.h
contrib/userlock/Makefile
contrib/userlock/README.user_locks
contrib/userlock/user_locks.c
contrib/userlock/user_locks.h
contrib/userlock/user_locks.sql.in
contrib/vacuumlo/Makefile
contrib/vacuumlo/README.vacuumlo
contrib/vacuumlo/vacuumlo.c
contrib/xml/Makefile
contrib/xml/README
contrib/xml/TODO
contrib/xml/pgxml.c
contrib/xml/pgxml.h
contrib/xml/pgxml.source
contrib/xml/pgxml_dom.c
contrib/xml/pgxml_dom.source
doc/FAQ
doc/FAQ_AIX
doc/FAQ_DEV
doc/FAQ_HPUX
doc/FAQ_IRIX
doc/FAQ_MSWIN
doc/FAQ_QNX4
doc/FAQ_SCO
doc/FAQ_Solaris
doc/FAQ_german
doc/FAQ_japanese
doc/FAQ_polish
doc/FAQ_russian
doc/KNOWN_BUGS
doc/MISSING_FEATURES
doc/Makefile
doc/README.mb.big5
doc/README.mb.jp
doc/TODO
doc/TODO.detail/README
doc/TODO.detail/atttypmod
doc/TODO.detail/crossdb
doc/TODO.detail/cursor
doc/TODO.detail/drop
doc/TODO.detail/exists
doc/TODO.detail/foreign
doc/TODO.detail/fsync
doc/TODO.detail/inheritance
doc/TODO.detail/java
doc/TODO.detail/mmap
doc/TODO.detail/namedatalen
doc/TODO.detail/optimizer
doc/TODO.detail/performance
doc/TODO.detail/persistent
doc/TODO.detail/pool
doc/TODO.detail/prepare
doc/TODO.detail/privileges
doc/TODO.detail/replication
doc/TODO.detail/schema
doc/TODO.detail/tablespaces
doc/TODO.detail/thread
doc/TODO.detail/transactions
doc/TODO.detail/typeconv
doc/TODO.detail/update
doc/TODO.detail/vacuum
doc/TODO.detail/view
doc/TODO.detail/win32
doc/TODO.detail/yacc
doc/bug.template
doc/src/FAQ/FAQ.html
doc/src/FAQ/FAQ_DEV.html
doc/src/FAQ/FAQ_german.html
doc/src/FAQ/FAQ_japanese.html
doc/src/FAQ/FAQ_polish.html
doc/src/FAQ/FAQ_russian.html
doc/src/Makefile
doc/src/graphics/catalogs.ag
doc/src/graphics/catalogs.cgm
doc/src/graphics/catalogs.gif
doc/src/graphics/catalogs.ps
doc/src/graphics/clientserver.ag
doc/src/graphics/clientserver.gif
doc/src/graphics/connections.ag
doc/src/graphics/connections.gif
doc/src/sgml/Makefile
doc/src/sgml/admin.sgml
doc/src/sgml/advanced.sgml
doc/src/sgml/arch-dev.sgml
doc/src/sgml/arch-pg.sgml
doc/src/sgml/array.sgml
doc/src/sgml/backup.sgml
doc/src/sgml/biblio.sgml
doc/src/sgml/bki.sgml
doc/src/sgml/book-decl.sgml
doc/src/sgml/catalogs.sgml
doc/src/sgml/charset.sgml
doc/src/sgml/client-auth.sgml
doc/src/sgml/compiler.sgml
doc/src/sgml/contacts.sgml
doc/src/sgml/cvs.sgml
doc/src/sgml/datatype.sgml
doc/src/sgml/datetime.sgml
doc/src/sgml/developer.sgml
doc/src/sgml/dfunc.sgml
doc/src/sgml/diskusage.sgml
doc/src/sgml/docguide.sgml
doc/src/sgml/ecpg.sgml
doc/src/sgml/extend.sgml
doc/src/sgml/features.sgml
doc/src/sgml/filelist.sgml
doc/src/sgml/fixrtf
doc/src/sgml/func-ref.sgml
doc/src/sgml/func.sgml
doc/src/sgml/geqo.sgml
doc/src/sgml/gist.sgml
doc/src/sgml/history.sgml
doc/src/sgml/indexcost.sgml
doc/src/sgml/indices.sgml
doc/src/sgml/info.sgml
doc/src/sgml/inherit.sgml
doc/src/sgml/install-win32.sgml
doc/src/sgml/installation.sgml
doc/src/sgml/intro.sgml
doc/src/sgml/jdbc.sgml
doc/src/sgml/keywords.sgml
doc/src/sgml/legal.sgml
doc/src/sgml/libpgeasy.sgml
doc/src/sgml/libpgtcl.sgml
doc/src/sgml/libpq++.sgml
doc/src/sgml/libpq.sgml
doc/src/sgml/lobj.sgml
doc/src/sgml/maintenance.sgml
doc/src/sgml/manage-ag.sgml
doc/src/sgml/manage.sgml
doc/src/sgml/monitoring.sgml
doc/src/sgml/mvcc.sgml
doc/src/sgml/nls.sgml
doc/src/sgml/notation.sgml
doc/src/sgml/odbc.sgml
doc/src/sgml/page.sgml
doc/src/sgml/perform.sgml
doc/src/sgml/plperl.sgml
doc/src/sgml/plpython.sgml
doc/src/sgml/plsql.sgml
doc/src/sgml/pltcl.sgml
doc/src/sgml/postgres.sgml
doc/src/sgml/problems.sgml
doc/src/sgml/programmer.sgml
doc/src/sgml/protocol.sgml
doc/src/sgml/pygresql.sgml
doc/src/sgml/queries.sgml
doc/src/sgml/query.sgml
doc/src/sgml/recovery.sgml
doc/src/sgml/ref/abort.sgml
doc/src/sgml/ref/allfiles.sgml
doc/src/sgml/ref/alter_database.sgml
doc/src/sgml/ref/alter_group.sgml
doc/src/sgml/ref/alter_table.sgml
doc/src/sgml/ref/alter_trigger.sgml
doc/src/sgml/ref/alter_user.sgml
doc/src/sgml/ref/analyze.sgml
doc/src/sgml/ref/begin.sgml
doc/src/sgml/ref/checkpoint.sgml
doc/src/sgml/ref/close.sgml
doc/src/sgml/ref/cluster.sgml
doc/src/sgml/ref/comment.sgml
doc/src/sgml/ref/commit.sgml
doc/src/sgml/ref/copy.sgml
doc/src/sgml/ref/create_aggregate.sgml
doc/src/sgml/ref/create_constraint.sgml
doc/src/sgml/ref/create_database.sgml
doc/src/sgml/ref/create_domain.sgml
doc/src/sgml/ref/create_function.sgml
doc/src/sgml/ref/create_group.sgml
doc/src/sgml/ref/create_index.sgml
doc/src/sgml/ref/create_language.sgml
doc/src/sgml/ref/create_operator.sgml
doc/src/sgml/ref/create_rule.sgml
doc/src/sgml/ref/create_schema.sgml
doc/src/sgml/ref/create_sequence.sgml
doc/src/sgml/ref/create_table.sgml
doc/src/sgml/ref/create_table_as.sgml
doc/src/sgml/ref/create_trigger.sgml
doc/src/sgml/ref/create_type.sgml
doc/src/sgml/ref/create_user.sgml
doc/src/sgml/ref/create_view.sgml
doc/src/sgml/ref/createdb.sgml
doc/src/sgml/ref/createlang.sgml
doc/src/sgml/ref/createuser.sgml
doc/src/sgml/ref/current_date.sgml
doc/src/sgml/ref/current_time.sgml
doc/src/sgml/ref/current_timestamp.sgml
doc/src/sgml/ref/current_user.sgml
doc/src/sgml/ref/declare.sgml
doc/src/sgml/ref/delete.sgml
doc/src/sgml/ref/drop_aggregate.sgml
doc/src/sgml/ref/drop_database.sgml
doc/src/sgml/ref/drop_domain.sgml
doc/src/sgml/ref/drop_function.sgml
doc/src/sgml/ref/drop_group.sgml
doc/src/sgml/ref/drop_index.sgml
doc/src/sgml/ref/drop_language.sgml
doc/src/sgml/ref/drop_operator.sgml
doc/src/sgml/ref/drop_rule.sgml
doc/src/sgml/ref/drop_sequence.sgml
doc/src/sgml/ref/drop_table.sgml
doc/src/sgml/ref/drop_trigger.sgml
doc/src/sgml/ref/drop_type.sgml
doc/src/sgml/ref/drop_user.sgml
doc/src/sgml/ref/drop_view.sgml
doc/src/sgml/ref/dropdb.sgml
doc/src/sgml/ref/droplang.sgml
doc/src/sgml/ref/dropuser.sgml
doc/src/sgml/ref/ecpg-ref.sgml
doc/src/sgml/ref/end.sgml
doc/src/sgml/ref/explain.sgml
doc/src/sgml/ref/fetch.sgml
doc/src/sgml/ref/grant.sgml
doc/src/sgml/ref/initdb.sgml
doc/src/sgml/ref/initlocation.sgml
doc/src/sgml/ref/insert.sgml
doc/src/sgml/ref/ipcclean.sgml
doc/src/sgml/ref/listen.sgml
doc/src/sgml/ref/load.sgml
doc/src/sgml/ref/lock.sgml
doc/src/sgml/ref/move.sgml
doc/src/sgml/ref/notify.sgml
doc/src/sgml/ref/pg_config-ref.sgml
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Diffstat (limited to 'src/backend/storage/lmgr/lock.c')
-rw-r--r-- | src/backend/storage/lmgr/lock.c | 1467 |
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 */ |