*
*
* IDENTIFICATION
- * $PostgreSQL: pgsql/src/backend/postmaster/postmaster.c,v 1.572 2009/02/19 16:43:13 heikki Exp $
+ * $PostgreSQL: pgsql/src/backend/postmaster/postmaster.c,v 1.573 2009/02/23 09:28:50 heikki Exp $
*
* NOTES
*
static int Shutdown = NoShutdown;
static bool FatalError = false; /* T if recovering from backend crash */
-static bool RecoveryError = false; /* T if recovery failed */
-
-/* State of WAL redo */
-#define NoRecovery 0
-#define RecoveryStarted 1
-#define RecoveryConsistent 2
-#define RecoveryCompleted 3
-
-static int RecoveryStatus = NoRecovery;
+static bool RecoveryError = false; /* T if WAL recovery failed */
/*
* We use a simple state machine to control startup, shutdown, and
* could start accepting connections to perform read-only queries at this
* point, if we had the infrastructure to do that.
*
- * When the WAL redo is finished, the startup process signals us the third
- * time, and we switch to PM_RUN state. The startup process can also skip the
+ * When WAL redo is finished, the startup process exits with exit code 0
+ * and we switch to PM_RUN state. Startup process can also skip the
* recovery and consistent recovery phases altogether, as it will during
* normal startup when there's no recovery to be done, for example.
*
static void reaper(SIGNAL_ARGS);
static void sigusr1_handler(SIGNAL_ARGS);
static void dummy_handler(SIGNAL_ARGS);
-static void CheckRecoverySignals(void);
static void CleanupBackend(int pid, int exitstatus);
static void HandleChildCrash(int pid, int exitstatus, const char *procname);
static void LogChildExit(int lev, const char *procname,
ereport(LOG,
(errmsg("received smart shutdown request")));
- if (pmState == PM_RUN || pmState == PM_RECOVERY || pmState == PM_RECOVERY_CONSISTENT)
+ if (pmState == PM_RUN || pmState == PM_RECOVERY ||
+ pmState == PM_RECOVERY_CONSISTENT)
{
/* autovacuum workers are told to shut down immediately */
SignalAutovacWorkers(SIGTERM);
{
StartupPID = 0;
- /*
- * Check if we've received a signal from the startup process
- * first. This can change pmState. If the startup process sends
- * a signal and exits immediately after that, we might not have
- * processed the signal yet. We need to know if it completed
- * recovery before it exited.
- */
- CheckRecoverySignals();
-
/*
* Unexpected exit of startup process (including FATAL exit)
* during PM_STARTUP is treated as catastrophic. There is no
- * other processes running yet.
+ * other processes running yet, so we can just exit.
*/
- if (pmState == PM_STARTUP)
+ if (pmState == PM_STARTUP && !EXIT_STATUS_0(exitstatus))
{
LogChildExit(LOG, _("startup process"),
pid, exitstatus);
(errmsg("aborting startup due to startup process failure")));
ExitPostmaster(1);
}
+ /*
+ * Startup process exited in response to a shutdown request (or
+ * it completed normally regardless of the shutdown request).
+ */
+ if (Shutdown > NoShutdown &&
+ (EXIT_STATUS_0(exitstatus) || EXIT_STATUS_1(exitstatus)))
+ {
+ pmState = PM_WAIT_BACKENDS;
+ /* PostmasterStateMachine logic does the rest */
+ continue;
+ }
/*
* Any unexpected exit (including FATAL exit) of the startup
* process is treated as a crash, except that we don't want
_("startup process"));
continue;
}
+
/*
- * Startup process exited normally, but didn't finish recovery.
- * This can happen if someone else than postmaster kills the
- * startup process with SIGTERM. Treat it like a crash.
+ * Startup succeeded, commence normal operations
*/
- if (pmState == PM_RECOVERY || pmState == PM_RECOVERY_CONSISTENT)
- {
- RecoveryError = true;
- HandleChildCrash(pid, exitstatus,
- _("startup process"));
- continue;
- }
+ FatalError = false;
+ pmState = PM_RUN;
+
+ /*
+ * Load the flat authorization file into postmaster's cache. The
+ * startup process has recomputed this from the database contents,
+ * so we wait till it finishes before loading it.
+ */
+ load_role();
+
+ /*
+ * Crank up the background writer, if we didn't do that already
+ * when we entered consistent recovery phase. It doesn't matter
+ * if this fails, we'll just try again later.
+ */
+ if (BgWriterPID == 0)
+ BgWriterPID = StartBackgroundWriter();
+
+ /*
+ * Likewise, start other special children as needed. In a restart
+ * situation, some of them may be alive already.
+ */
+ if (WalWriterPID == 0)
+ WalWriterPID = StartWalWriter();
+ if (AutoVacuumingActive() && AutoVacPID == 0)
+ AutoVacPID = StartAutoVacLauncher();
+ if (XLogArchivingActive() && PgArchPID == 0)
+ PgArchPID = pgarch_start();
+ if (PgStatPID == 0)
+ PgStatPID = pgstat_start();
+
+ /* at this point we are really open for business */
+ ereport(LOG,
+ (errmsg("database system is ready to accept connections")));
}
/*
static void
PostmasterStateMachine(void)
{
- /* Startup states */
-
- if (pmState == PM_STARTUP && RecoveryStatus > NoRecovery)
- {
- /* WAL redo has started. We're out of reinitialization. */
- FatalError = false;
-
- /*
- * Go to shutdown mode if a shutdown request was pending.
- */
- if (Shutdown > NoShutdown)
- {
- pmState = PM_WAIT_BACKENDS;
- /* PostmasterStateMachine logic does the rest */
- }
- else
- {
- /*
- * Crank up the background writer. It doesn't matter if this
- * fails, we'll just try again later.
- */
- Assert(BgWriterPID == 0);
- BgWriterPID = StartBackgroundWriter();
-
- pmState = PM_RECOVERY;
- }
- }
- if (pmState == PM_RECOVERY && RecoveryStatus >= RecoveryConsistent)
- {
- /*
- * Recovery has reached a consistent recovery point. Go to shutdown
- * mode if a shutdown request was pending.
- */
- if (Shutdown > NoShutdown)
- {
- pmState = PM_WAIT_BACKENDS;
- /* PostmasterStateMachine logic does the rest */
- }
- else
- {
- pmState = PM_RECOVERY_CONSISTENT;
-
- /*
- * Load the flat authorization file into postmaster's cache. The
- * startup process won't have recomputed this from the database yet,
- * so we it may change following recovery.
- */
- load_role();
-
- /*
- * Likewise, start other special children as needed.
- */
- Assert(PgStatPID == 0);
- PgStatPID = pgstat_start();
-
- /* XXX at this point we could accept read-only connections */
- ereport(DEBUG1,
- (errmsg("database system is in consistent recovery mode")));
- }
- }
- if ((pmState == PM_RECOVERY ||
- pmState == PM_RECOVERY_CONSISTENT ||
- pmState == PM_STARTUP) &&
- RecoveryStatus == RecoveryCompleted)
- {
- /*
- * Startup succeeded.
- *
- * Go to shutdown mode if a shutdown request was pending.
- */
- if (Shutdown > NoShutdown)
- {
- pmState = PM_WAIT_BACKENDS;
- /* PostmasterStateMachine logic does the rest */
- }
- else
- {
- /*
- * Otherwise, commence normal operations.
- */
- pmState = PM_RUN;
-
- /*
- * Load the flat authorization file into postmaster's cache. The
- * startup process has recomputed this from the database contents,
- * so we wait till it finishes before loading it.
- */
- load_role();
-
- /*
- * Crank up the background writer, if we didn't do that already
- * when we entered consistent recovery phase. It doesn't matter
- * if this fails, we'll just try again later.
- */
- if (BgWriterPID == 0)
- BgWriterPID = StartBackgroundWriter();
-
- /*
- * Likewise, start other special children as needed. In a restart
- * situation, some of them may be alive already.
- */
- if (WalWriterPID == 0)
- WalWriterPID = StartWalWriter();
- if (AutoVacuumingActive() && AutoVacPID == 0)
- AutoVacPID = StartAutoVacLauncher();
- if (XLogArchivingActive() && PgArchPID == 0)
- PgArchPID = pgarch_start();
- if (PgStatPID == 0)
- PgStatPID = pgstat_start();
-
- /* at this point we are really open for business */
- ereport(LOG,
- (errmsg("database system is ready to accept connections")));
- }
- }
-
- /* Shutdown states */
-
if (pmState == PM_WAIT_BACKUP)
{
/*
shmem_exit(1);
reset_shared(PostPortNumber);
- RecoveryStatus = NoRecovery;
-
StartupPID = StartupDataBase();
Assert(StartupPID != 0);
pmState = PM_STARTUP;
}
/*
- * common code used in sigusr1_handler() and reaper() to handle
- * recovery-related signals from startup process
+ * sigusr1_handler - handle signal conditions from child processes
*/
static void
-CheckRecoverySignals(void)
+sigusr1_handler(SIGNAL_ARGS)
{
- bool changed = false;
+ int save_errno = errno;
- if (CheckPostmasterSignal(PMSIGNAL_RECOVERY_STARTED))
- {
- Assert(pmState == PM_STARTUP);
+ PG_SETMASK(&BlockSig);
- RecoveryStatus = RecoveryStarted;
- changed = true;
- }
- if (CheckPostmasterSignal(PMSIGNAL_RECOVERY_CONSISTENT))
+ /*
+ * RECOVERY_STARTED and RECOVERY_CONSISTENT signals are ignored in
+ * unexpected states. If the startup process quickly starts up, completes
+ * recovery, exits, we might process the death of the startup process
+ * first. We don't want to go back to recovery in that case.
+ */
+ if (CheckPostmasterSignal(PMSIGNAL_RECOVERY_STARTED) &&
+ pmState == PM_STARTUP)
{
- RecoveryStatus = RecoveryConsistent;
- changed = true;
+ /* WAL redo has started. We're out of reinitialization. */
+ FatalError = false;
+
+ /*
+ * Crank up the background writer. It doesn't matter if this
+ * fails, we'll just try again later.
+ */
+ Assert(BgWriterPID == 0);
+ BgWriterPID = StartBackgroundWriter();
+
+ pmState = PM_RECOVERY;
}
- if (CheckPostmasterSignal(PMSIGNAL_RECOVERY_COMPLETED))
+ if (CheckPostmasterSignal(PMSIGNAL_RECOVERY_CONSISTENT) &&
+ pmState == PM_RECOVERY)
{
- RecoveryStatus = RecoveryCompleted;
- changed = true;
- }
-
- if (changed)
- PostmasterStateMachine();
-}
+ /*
+ * Load the flat authorization file into postmaster's cache. The
+ * startup process won't have recomputed this from the database yet,
+ * so we it may change following recovery.
+ */
+ load_role();
-/*
- * sigusr1_handler - handle signal conditions from child processes
- */
-static void
-sigusr1_handler(SIGNAL_ARGS)
-{
- int save_errno = errno;
+ /*
+ * Likewise, start other special children as needed.
+ */
+ Assert(PgStatPID == 0);
+ PgStatPID = pgstat_start();
- PG_SETMASK(&BlockSig);
+ /* XXX at this point we could accept read-only connections */
+ ereport(DEBUG1,
+ (errmsg("database system is in consistent recovery mode")));
- CheckRecoverySignals();
+ pmState = PM_RECOVERY_CONSISTENT;
+ }
if (CheckPostmasterSignal(PMSIGNAL_PASSWORD_CHANGE))
{
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