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Commitc670410

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Move the responsibility for calling StartupXLOG into InitPostgres, for
those process types that go through InitPostgres; in particular, bootstrapand standalone-backend cases. This ensures that we have set up a PGPROCand done some other basic initialization steps (corresponding to theif (IsUnderPostmaster) block in AuxiliaryProcessMain) before we attempt torun WAL recovery in a standalone backend. As was discovered last September,this is necessary for some corner-case code paths during WAL recovery,particularly end-of-WAL cleanup.Moving the bootstrap case here too is not necessary for correctness, but itseems like a good idea since it reduces the number of distinct code paths.
1 parentee7769b commitc670410

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3 files changed

+34
-44
lines changed

3 files changed

+34
-44
lines changed

‎src/backend/bootstrap/bootstrap.c‎

Lines changed: 5 additions & 20 deletions
Original file line numberDiff line numberDiff line change
@@ -8,7 +8,7 @@
88
* Portions Copyright (c) 1994, Regents of the University of California
99
*
1010
* IDENTIFICATION
11-
* $PostgreSQL: pgsql/src/backend/bootstrap/bootstrap.c,v 1.260 2010/02/26 02:00:35 momjian Exp $
11+
* $PostgreSQL: pgsql/src/backend/bootstrap/bootstrap.c,v 1.261 2010/04/20 01:38:52 tgl Exp $
1212
*
1313
*-------------------------------------------------------------------------
1414
*/
@@ -397,14 +397,13 @@ AuxiliaryProcessMain(int argc, char *argv[])
397397
switch (auxType)
398398
{
399399
caseCheckerProcess:
400-
bootstrap_signals();
400+
/* don't set signals, they're useless here */
401401
CheckerModeMain();
402402
proc_exit(1);/* should never return */
403403

404404
caseBootstrapProcess:
405405
bootstrap_signals();
406406
BootStrapXLOG();
407-
StartupXLOG();
408407
BootstrapModeMain();
409408
proc_exit(1);/* should never return */
410409

@@ -438,23 +437,12 @@ AuxiliaryProcessMain(int argc, char *argv[])
438437
/*
439438
* In shared memory checker mode, all we really want to do is create shared
440439
* memory and semaphores (just to prove we can do it with the current GUC
441-
* settings).
440+
* settings). Since, in fact, that was already done by BaseInit(),
441+
* we have nothing more to do here.
442442
*/
443443
staticvoid
444444
CheckerModeMain(void)
445445
{
446-
/*
447-
* We must be getting invoked for bootstrap mode
448-
*/
449-
Assert(!IsUnderPostmaster);
450-
451-
SetProcessingMode(BootstrapProcessing);
452-
453-
/*
454-
* Do backend-like initialization for bootstrap mode
455-
*/
456-
InitProcess();
457-
InitPostgres(NULL,InvalidOid,NULL,NULL);
458446
proc_exit(0);
459447
}
460448

@@ -478,6 +466,7 @@ BootstrapModeMain(void)
478466
* Do backend-like initialization for bootstrap mode
479467
*/
480468
InitProcess();
469+
481470
InitPostgres(NULL,InvalidOid,NULL,NULL);
482471

483472
/* Initialize stuff for bootstrap-file processing */
@@ -498,10 +487,6 @@ BootstrapModeMain(void)
498487
*/
499488
RelationMapFinishBootstrap();
500489

501-
/* Perform a checkpoint to ensure everything's down to disk */
502-
SetProcessingMode(NormalProcessing);
503-
CreateCheckPoint(CHECKPOINT_IS_SHUTDOWN |CHECKPOINT_IMMEDIATE);
504-
505490
/* Clean up and exit */
506491
cleanup();
507492
proc_exit(0);

‎src/backend/tcop/postgres.c‎

Lines changed: 5 additions & 15 deletions
Original file line numberDiff line numberDiff line change
@@ -8,7 +8,7 @@
88
*
99
*
1010
* IDENTIFICATION
11-
* $PostgreSQL: pgsql/src/backend/tcop/postgres.c,v 1.592 2010/03/21 00:17:58 petere Exp $
11+
* $PostgreSQL: pgsql/src/backend/tcop/postgres.c,v 1.593 2010/04/20 01:38:52 tgl Exp $
1212
*
1313
* NOTES
1414
* this is the "main" module of the postgres backend and
@@ -3531,11 +3531,7 @@ PostgresMain(int argc, char *argv[], const char *username)
35313531

35323532
PG_SETMASK(&BlockSig);/* block everything except SIGQUIT */
35333533

3534-
if (IsUnderPostmaster)
3535-
{
3536-
BaseInit();
3537-
}
3538-
else
3534+
if (!IsUnderPostmaster)
35393535
{
35403536
/*
35413537
* Validate we have been given a reasonable-looking DataDir (if under
@@ -3551,17 +3547,11 @@ PostgresMain(int argc, char *argv[], const char *username)
35513547
* Create lockfile for data directory.
35523548
*/
35533549
CreateDataDirLockFile(false);
3554-
3555-
BaseInit();
3556-
3557-
/*
3558-
* Start up xlog for standalone backend, and register to have it
3559-
* closed down at exit.
3560-
*/
3561-
StartupXLOG();
3562-
on_shmem_exit(ShutdownXLOG,0);
35633550
}
35643551

3552+
/* Early initialization */
3553+
BaseInit();
3554+
35653555
/*
35663556
* Create a per-backend PGPROC struct in shared memory, except in the
35673557
* EXEC_BACKEND case where this was done in SubPostmasterMain. We must do

‎src/backend/utils/init/postinit.c‎

Lines changed: 24 additions & 9 deletions
Original file line numberDiff line numberDiff line change
@@ -8,7 +8,7 @@
88
*
99
*
1010
* IDENTIFICATION
11-
* $PostgreSQL: pgsql/src/backend/utils/init/postinit.c,v 1.208 2010/03/25 20:40:17 sriggs Exp $
11+
* $PostgreSQL: pgsql/src/backend/utils/init/postinit.c,v 1.209 2010/04/20 01:38:52 tgl Exp $
1212
*
1313
*
1414
*-------------------------------------------------------------------------
@@ -427,11 +427,9 @@ pg_split_opts(char **argv, int *argcp, char *optstr)
427427
* Early initialization of a backend (either standalone or under postmaster).
428428
* This happens even before InitPostgres.
429429
*
430-
* If you're wondering why this is separate from InitPostgres at all:
431-
* the critical distinction is that this stuff has to happen before we can
432-
* run XLOG-related initialization, which is done before InitPostgres --- in
433-
* fact, for cases such as the background writer process, InitPostgres may
434-
* never be done at all.
430+
* This is separate from InitPostgres because it is also called by auxiliary
431+
* processes, such as the background writer process, which may not call
432+
* InitPostgres at all.
435433
*/
436434
void
437435
BaseInit(void)
@@ -512,11 +510,28 @@ InitPostgres(const char *in_dbname, Oid dboid, const char *username,
512510
InitBufferPoolBackend();
513511

514512
/*
515-
* Initialize local process's access to XLOG, if appropriate. In
516-
* bootstrap case we skip this since StartupXLOG() was run instead.
513+
* Initialize local process's access to XLOG.
517514
*/
518-
if (!bootstrap)
515+
if (IsUnderPostmaster)
516+
{
517+
/*
518+
* The postmaster already started the XLOG machinery, but we need
519+
* to call InitXLOGAccess(), if the system isn't in hot-standby mode.
520+
* This is handled by calling RecoveryInProgress and ignoring the
521+
* result.
522+
*/
519523
(void)RecoveryInProgress();
524+
}
525+
else
526+
{
527+
/*
528+
* We are either a bootstrap process or a standalone backend.
529+
* Either way, start up the XLOG machinery, and register to have it
530+
* closed down at exit.
531+
*/
532+
StartupXLOG();
533+
on_shmem_exit(ShutdownXLOG,0);
534+
}
520535

521536
/*
522537
* Initialize the relation cache and the system catalog caches. Note that

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