diff options
Diffstat (limited to 'src/include/storage/proc.h')
| -rw-r--r-- | src/include/storage/proc.h | 25 |
1 files changed, 13 insertions, 12 deletions
diff --git a/src/include/storage/proc.h b/src/include/storage/proc.h index f771d71933c..ece321028fc 100644 --- a/src/include/storage/proc.h +++ b/src/include/storage/proc.h @@ -7,7 +7,7 @@ * Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group * Portions Copyright (c) 1994, Regents of the University of California * - * $PostgreSQL: pgsql/src/include/storage/proc.h,v 1.78 2005/05/19 21:35:47 tgl Exp $ + * $PostgreSQL: pgsql/src/include/storage/proc.h,v 1.79 2005/06/17 22:32:50 tgl Exp $ * *------------------------------------------------------------------------- */ @@ -46,6 +46,13 @@ struct XidCache * links: list link for any list the PGPROC is in. When waiting for a lock, * the PGPROC is linked into that lock's waitProcs queue. A recycled PGPROC * is linked into ProcGlobal's freeProcs list. + * + * Note: twophase.c also sets up a dummy PGPROC struct for each currently + * prepared transaction. These PGPROCs appear in the ProcArray data structure + * so that the prepared transactions appear to be still running and are + * correctly shown as holding locks. A prepared transaction PGPROC can be + * distinguished from a real one at need by the fact that it has pid == 0. + * The semaphore and lock-related fields in a prepared-xact PGPROC are unused. */ struct PGPROC { @@ -62,16 +69,9 @@ struct PGPROC * were starting our xact: vacuum must not * remove tuples deleted by xid >= xmin ! */ - int pid; /* This backend's process id */ + int pid; /* This backend's process id, or 0 */ Oid databaseId; /* OID of database this backend is using */ - /* - * XLOG location of first XLOG record written by this backend's - * current transaction. If backend is not in a transaction or hasn't - * yet modified anything, logRec.xrecoff is zero. - */ - XLogRecPtr logRec; - /* Info about LWLock the process is currently waiting for, if any. */ bool lwWaiting; /* true if waiting for an LW lock */ bool lwExclusive; /* true if waiting for exclusive access */ @@ -120,11 +120,12 @@ extern int StatementTimeout; /* * Function Prototypes */ -extern int ProcGlobalSemas(int maxBackends); -extern int ProcGlobalShmemSize(int maxBackends); -extern void InitProcGlobal(int maxBackends); +extern int ProcGlobalSemas(void); +extern int ProcGlobalShmemSize(void); +extern void InitProcGlobal(void); extern void InitProcess(void); extern void InitDummyProcess(int proctype); +extern bool HaveNFreeProcs(int n); extern void ProcReleaseLocks(bool isCommit); extern void ProcQueueInit(PROC_QUEUE *queue); |