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Typedefs
typedef struct PMSignalData	PMSignalData

Enumerations
enum	PMSignalReason { PMSIGNAL_RECOVERY_STARTED, PMSIGNAL_BEGIN_HOT_STANDBY, PMSIGNAL_WAKEN_ARCHIVER, PMSIGNAL_ROTATE_LOGFILE, PMSIGNAL_START_AUTOVAC_LAUNCHER, PMSIGNAL_START_AUTOVAC_WORKER, PMSIGNAL_BACKGROUND_WORKER_CHANGE, PMSIGNAL_START_WALRECEIVER, PMSIGNAL_ADVANCE_STATE_MACHINE, NUM_PMSIGNALS }

Functions
Size	PMSignalShmemSize (void)

void	PMSignalShmemInit (void)

void	SendPostmasterSignal (PMSignalReason reason)

bool	CheckPostmasterSignal (PMSignalReason reason)

int	AssignPostmasterChildSlot (void)

bool	ReleasePostmasterChildSlot (int slot)

bool	IsPostmasterChildWalSender (int slot)

void	MarkPostmasterChildActive (void)

void	MarkPostmasterChildInactive (void)

void	MarkPostmasterChildWalSender (void)

bool	PostmasterIsAlive (void)

Typedef Documentation

typedef struct PMSignalData PMSignalData

Definition at line 39 of file pmsignal.h.

Enumeration Type Documentation

enum PMSignalReason

Enumerator
PMSIGNAL_RECOVERY_STARTED
PMSIGNAL_BEGIN_HOT_STANDBY
PMSIGNAL_WAKEN_ARCHIVER
PMSIGNAL_ROTATE_LOGFILE
PMSIGNAL_START_AUTOVAC_LAUNCHER
PMSIGNAL_START_AUTOVAC_WORKER
PMSIGNAL_BACKGROUND_WORKER_CHANGE
PMSIGNAL_START_WALRECEIVER
PMSIGNAL_ADVANCE_STATE_MACHINE
NUM_PMSIGNALS

Definition at line 23 of file pmsignal.h.

 {
     PMSIGNAL_RECOVERY_STARTED,  /* recovery has started */
     PMSIGNAL_BEGIN_HOT_STANDBY, /* begin Hot Standby */
     PMSIGNAL_WAKEN_ARCHIVER,    /* send a NOTIFY signal to xlog archiver */
     PMSIGNAL_ROTATE_LOGFILE,    /* send SIGUSR1 to syslogger to rotate logfile */
     PMSIGNAL_START_AUTOVAC_LAUNCHER,    /* start an autovacuum launcher */
     PMSIGNAL_START_AUTOVAC_WORKER,  /* start an autovacuum worker */
     PMSIGNAL_BACKGROUND_WORKER_CHANGE,  /* background worker state change */
     PMSIGNAL_START_WALRECEIVER, /* start a walreceiver */
     PMSIGNAL_ADVANCE_STATE_MACHINE, /* advance postmaster's state machine */
 
     NUM_PMSIGNALS               /* Must be last value of enum! */
 } PMSignalReason;

Function Documentation

int AssignPostmasterChildSlot ( void )

Definition at line 151 of file pmsignal.c.

References elog, FATAL, PMSignalData::next_child_flag, PMSignalData::num_child_flags, PM_CHILD_ASSIGNED, PM_CHILD_UNUSED, PMSignalData::PMChildFlags, and PMSignalState.

Referenced by assign_backendlist_entry(), BackendStartup(), and StartAutovacuumWorker().

 {
     int         slot = PMSignalState->next_child_flag;
     int         n;
 
     /*
      * Scan for a free slot.  We track the last slot assigned so as not to
      * waste time repeatedly rescanning low-numbered slots.
      */
     for (n = PMSignalState->num_child_flags; n > 0; n--)
     {
         if (--slot < 0)
             slot = PMSignalState->num_child_flags - 1;
         if (PMSignalState->PMChildFlags[slot] == PM_CHILD_UNUSED)
         {
             PMSignalState->PMChildFlags[slot] = PM_CHILD_ASSIGNED;
             PMSignalState->next_child_flag = slot;
             return slot + 1;
         }
     }
 
     /* Out of slots ... should never happen, else postmaster.c messed up */
     elog(FATAL, "no free slots in PMChildFlags array");
     return 0;                   /* keep compiler quiet */
 }

bool CheckPostmasterSignal ( PMSignalReason reason )

Definition at line 130 of file pmsignal.c.

References PMSignalData::PMSignalFlags, and PMSignalState.

Referenced by sigusr1_handler().

 {
     /* Careful here --- don't clear flag if we haven't seen it set */
     if (PMSignalState->PMSignalFlags[reason])
     {
         PMSignalState->PMSignalFlags[reason] = false;
         return true;
     }
     return false;
 }

bool IsPostmasterChildWalSender ( int slot )

Definition at line 207 of file pmsignal.c.

References Assert, PM_CHILD_WALSENDER, PMSignalData::PMChildFlags, and PMSignalState.

Referenced by CountChildren(), and SignalSomeChildren().

 {
     Assert(slot > 0 && slot <= PMSignalState->num_child_flags);
     slot--;
 
     if (PMSignalState->PMChildFlags[slot] == PM_CHILD_WALSENDER)
         return true;
     else
         return false;
 }

void MarkPostmasterChildActive ( void )

Definition at line 223 of file pmsignal.c.

References Assert, MyPMChildSlot, PM_CHILD_ACTIVE, PM_CHILD_ASSIGNED, PMSignalData::PMChildFlags, and PMSignalState.

Referenced by InitProcess().

 {
     int         slot = MyPMChildSlot;
 
     Assert(slot > 0 && slot <= PMSignalState->num_child_flags);
     slot--;
     Assert(PMSignalState->PMChildFlags[slot] == PM_CHILD_ASSIGNED);
     PMSignalState->PMChildFlags[slot] = PM_CHILD_ACTIVE;
 }

void MarkPostmasterChildInactive ( void )

Definition at line 256 of file pmsignal.c.

References Assert, MyPMChildSlot, PM_CHILD_ACTIVE, PM_CHILD_ASSIGNED, PM_CHILD_WALSENDER, PMSignalData::PMChildFlags, and PMSignalState.

Referenced by ProcKill().

 {
     int         slot = MyPMChildSlot;
 
     Assert(slot > 0 && slot <= PMSignalState->num_child_flags);
     slot--;
     Assert(PMSignalState->PMChildFlags[slot] == PM_CHILD_ACTIVE ||
            PMSignalState->PMChildFlags[slot] == PM_CHILD_WALSENDER);
     PMSignalState->PMChildFlags[slot] = PM_CHILD_ASSIGNED;
 }

void MarkPostmasterChildWalSender ( void )

Definition at line 239 of file pmsignal.c.

References am_walsender, Assert, MyPMChildSlot, PM_CHILD_ACTIVE, PM_CHILD_WALSENDER, PMSignalData::PMChildFlags, and PMSignalState.

Referenced by WalSndShutdown().

 {
     int         slot = MyPMChildSlot;
 
     Assert(am_walsender);
 
     Assert(slot > 0 && slot <= PMSignalState->num_child_flags);
     slot--;
     Assert(PMSignalState->PMChildFlags[slot] == PM_CHILD_ACTIVE);
     PMSignalState->PMChildFlags[slot] = PM_CHILD_WALSENDER;
 }

void PMSignalShmemInit ( void )

Definition at line 95 of file pmsignal.c.

References MaxLivePostmasterChildren(), MemSet, PMSignalData::num_child_flags, PMSignalShmemSize(), PMSignalState, and ShmemInitStruct().

Referenced by CreateSharedMemoryAndSemaphores().

 {
     bool        found;
 
     PMSignalState = (PMSignalData *)
         ShmemInitStruct("PMSignalState", PMSignalShmemSize(), &found);
 
     if (!found)
     {
         MemSet(PMSignalState, 0, PMSignalShmemSize());
         PMSignalState->num_child_flags = MaxLivePostmasterChildren();
     }
 }

Size PMSignalShmemSize ( void )

Definition at line 80 of file pmsignal.c.

References add_size(), MaxLivePostmasterChildren(), mul_size(), and offsetof.

Referenced by CreateSharedMemoryAndSemaphores(), and PMSignalShmemInit().

 {
     Size        size;
 
     size = offsetof(PMSignalData, PMChildFlags);
     size = add_size(size, mul_size(MaxLivePostmasterChildren(),
                                    sizeof(sig_atomic_t)));
 
     return size;
 }

bool PostmasterIsAlive ( void )

Definition at line 272 of file pmsignal.c.

References EAGAIN, elog, EWOULDBLOCK, FATAL, postmaster_alive_fds, POSTMASTER_FD_WATCH, and read.

Referenced by HandleStartupProcInterrupts(), pgarch_ArchiverCopyLoop(), pgarch_MainLoop(), SyncRepWaitForLSN(), WalRcvWaitForStartPosition(), WalSndLoop(), WalSndWaitForWal(), and WalSndWriteData().

 {
 #ifndef WIN32
     char        c;
     ssize_t     rc;
 
     rc = read(postmaster_alive_fds[POSTMASTER_FD_WATCH], &c, 1);
     if (rc < 0)
     {
         if (errno == EAGAIN || errno == EWOULDBLOCK)
             return true;
         else
             elog(FATAL, "read on postmaster death monitoring pipe failed: %m");
     }
     else if (rc > 0)
         elog(FATAL, "unexpected data in postmaster death monitoring pipe");
 
     return false;
 #else                           /* WIN32 */
     return (WaitForSingleObject(PostmasterHandle, 0) == WAIT_TIMEOUT);
 #endif                          /* WIN32 */
 }

bool ReleasePostmasterChildSlot ( int slot )

Definition at line 185 of file pmsignal.c.

References Assert, PM_CHILD_ASSIGNED, PM_CHILD_UNUSED, PMSignalData::PMChildFlags, PMSignalState, and result.

Referenced by BackendStartup(), CleanupBackend(), CleanupBackgroundWorker(), do_start_bgworker(), HandleChildCrash(), and StartAutovacuumWorker().

 {
     bool        result;
 
     Assert(slot > 0 && slot <= PMSignalState->num_child_flags);
     slot--;
 
     /*
      * Note: the slot state might already be unused, because the logic in
      * postmaster.c is such that this might get called twice when a child
      * crashes.  So we don't try to Assert anything about the state.
      */
     result = (PMSignalState->PMChildFlags[slot] == PM_CHILD_ASSIGNED);
     PMSignalState->PMChildFlags[slot] = PM_CHILD_UNUSED;
     return result;
 }

void SendPostmasterSignal ( PMSignalReason reason )

Definition at line 113 of file pmsignal.c.

References IsUnderPostmaster, PMSignalData::PMSignalFlags, PMSignalState, PostmasterPid, and SIGUSR1.

Referenced by AutoVacLauncherMain(), CheckRecoveryConsistency(), do_start_worker(), GetNewMultiXactId(), GetNewTransactionId(), pg_rotate_logfile(), RegisterDynamicBackgroundWorker(), RequestXLogStreaming(), SetMultiXactIdLimit(), SetTransactionIdLimit(), StartupXLOG(), TerminateBackgroundWorker(), WalSndShutdown(), and XLogArchiveNotify().

 {
     /* If called in a standalone backend, do nothing */
     if (!IsUnderPostmaster)
         return;
     /* Atomically set the proper flag */
     PMSignalState->PMSignalFlags[reason] = true;
     /* Send signal to postmaster */
     kill(PostmasterPid, SIGUSR1);
 }

Typedefs

Enumerations

Functions

Typedef Documentation

Enumeration Type Documentation

Function Documentation