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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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43
src/backend/storage/lmgr/proc.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/storage/lmgr/proc.c,v 1.161 2005/07/31 17:19:19 tgl Exp $
* $PostgreSQL: pgsql/src/backend/storage/lmgr/proc.c,v 1.162 2005/08/08 03:11:55 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -144,7 +144,7 @@ InitProcGlobal(void)
ShmemInitStruct("Proc Header", sizeof(PROC_HDR), &foundProcGlobal);
/*
* Create or attach to the PGPROC structures for dummy (checkpoint)
* Create or attach to the PGPROC structures for dummy (bgwriter)
* processes, too. These do not get linked into the freeProcs list.
*/
DummyProcs = (PGPROC *)
@ -289,9 +289,10 @@ InitProcess(void)
/*
* InitDummyProcess -- create a dummy per-process data structure
*
* This is called by checkpoint processes so that they will have a MyProc
* value that's real enough to let them wait for LWLocks. The PGPROC and
* sema that are assigned are the extra ones created during InitProcGlobal.
* This is called by bgwriter and similar processes so that they will have a
* MyProc value that's real enough to let them wait for LWLocks. The PGPROC
* and sema that are assigned are the extra ones created during
* InitProcGlobal.
*
* Dummy processes are presently not expected to wait for real (lockmgr)
* locks, nor to participate in sinval messaging.
@ -485,27 +486,12 @@ ProcKill(int code, Datum arg)
Assert(MyProc != NULL);
/* Release any LW locks I am holding */
LWLockReleaseAll();
/*
* Make real sure we release any buffer locks and pins we might be
* holding, too. It is pretty ugly to do this here and not in a
* shutdown callback registered by the bufmgr ... but we must do this
* *after* LWLockReleaseAll and *before* zapping MyProc.
* Release any LW locks I am holding. There really shouldn't be any,
* but it's cheap to check again before we cut the knees off the LWLock
* facility by releasing our PGPROC ...
*/
AtProcExit_Buffers();
/* Get off any wait queue I might be on */
LockWaitCancel();
/* Remove from the standard lock table */
LockReleaseAll(DEFAULT_LOCKMETHOD, true);
#ifdef USER_LOCKS
/* Remove from the user lock table */
LockReleaseAll(USER_LOCKMETHOD, true);
#endif
LWLockReleaseAll();
/* Remove our PGPROC from the PGPROC array in shared memory */
ProcArrayRemove(MyProc);
@ -523,7 +509,7 @@ ProcKill(int code, Datum arg)
}
/*
* DummyProcKill() -- Cut-down version of ProcKill for dummy (checkpoint)
* DummyProcKill() -- Cut-down version of ProcKill for dummy (bgwriter)
* processes. The PGPROC and sema are not released, only marked
* as not-in-use.
*/
@ -539,14 +525,9 @@ DummyProcKill(int code, Datum arg)
Assert(MyProc == dummyproc);
/* Release any LW locks I am holding */
/* Release any LW locks I am holding (see notes above) */
LWLockReleaseAll();
/* Release buffer locks and pins, too */
AtProcExit_Buffers();
/* I can't be on regular lock queues, so needn't check */
/* Mark dummy proc no longer in use */
MyProc->pid = 0;