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Cause ShutdownPostgres to do a normal transaction abort during backend

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exit, instead of trying to take shortcuts.  Introduce some additional
shutdown callback routines to eliminate kluges like having ProcKill
be responsible for shutting down the buffer manager.  Ensure that the
order of operations during shutdown is predictable and what you would
expect given the module layering.
This commit is contained in:
Tom Lane
2005-08-08 03:12:16 +00:00
parent 89439b8c4f
commit 7117cd3a77
11 changed files with 119 additions and 100 deletions
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48
src/backend/utils/init/postinit.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/utils/init/postinit.c,v 1.155 2005/07/31 17:19:19 tgl Exp $
* $PostgreSQL: pgsql/src/backend/utils/init/postinit.c,v 1.156 2005/08/08 03:12:14 tgl Exp $
*
*
*-------------------------------------------------------------------------
@ -45,6 +45,7 @@
#include "utils/portal.h"
#include "utils/relcache.h"
#include "utils/syscache.h"
#include "pgstat.h"
static bool FindMyDatabase(const char *name, Oid *db_id, Oid *db_tablespace);
@ -287,7 +288,8 @@ BaseInit(void)
InitCommunication();
DebugFileOpen();
/* Do local initialization of storage and buffer managers */
/* Do local initialization of file, storage and buffer managers */
InitFileAccess();
smgrinit();
InitBufferPoolAccess();
}
@ -398,6 +400,11 @@ InitPostgres(const char *dbname, const char *username)
if (MyBackendId > MaxBackends || MyBackendId <= 0)
elog(FATAL, "bad backend id: %d", MyBackendId);
/*
* bufmgr needs another initialization call too
*/
InitBufferPoolBackend();
/*
* Initialize local process's access to XLOG. In bootstrap case we
* may skip this since StartupXLOG() was run instead.
@ -502,6 +509,15 @@ InitPostgres(const char *dbname, const char *username)
/* initialize client encoding */
InitializeClientEncoding();
/*
* Initialize statistics collection for this backend. We do this
* here because the shutdown hook it sets up needs to be invoked
* at the corresponding phase of backend shutdown: after
* ShutdownPostgres and before we drop access to shared memory.
*/
if (IsUnderPostmaster)
pgstat_bestart();
/*
* Set up process-exit callback to do pre-shutdown cleanup. This
* should be last because we want shmem_exit to call this routine
@ -518,6 +534,7 @@ InitPostgres(const char *dbname, const char *username)
return am_superuser;
}
/*
* Backend-shutdown callback. Do cleanup that we want to be sure happens
* before all the supporting modules begin to nail their doors shut via
@ -533,32 +550,19 @@ InitPostgres(const char *dbname, const char *username)
static void
ShutdownPostgres(int code, Datum arg)
{
/*
* These operations are really just a minimal subset of
* AbortTransaction(). We don't want to do any inessential cleanup,
* since that just raises the odds of failure --- but there's some
* stuff we need to do.
*
* Release any LW locks, buffer content locks, and buffer pins we might be
* holding. This is a kluge to improve the odds that we won't get into a
* self-made stuck-lock scenario while trying to shut down. We *must*
* release buffer pins to make it safe to do file deletion, since we
* might have some pins on pages of the target files.
*/
LWLockReleaseAll();
AtProcExit_Buffers();
AtProcExit_LocalBuffers();
/* Make sure we've killed any active transaction */
AbortOutOfAnyTransaction();
/*
* In case a transaction is open, delete any files it created. This
* has to happen before bufmgr shutdown, so having smgr register a
* callback for it wouldn't work.
* User locks are not released by transaction end, so be sure to
* release them explicitly.
*/
smgrDoPendingDeletes(false); /* delete as though aborting xact */
#ifdef USER_LOCKS
LockReleaseAll(USER_LOCKMETHOD, true);
#endif
}
/*
* Returns true if at least one role is defined in this database cluster.
*/