/*
* AuxiliaryProcKill() -- Cut-down version of ProcKill for auxiliary
* processes (bgwriter, etc). The PGPROC and sema are not released, only
* marked as not-in-use.
*/
static void
AuxiliaryProcKill(int code, Datum arg)
{
int proctype = DatumGetInt32(arg);
PGPROC *auxproc PG_USED_FOR_ASSERTS_ONLY;
Assert(proctype >= 0 && proctype < NUM_AUXILIARY_PROCS);
auxproc = &AuxiliaryProcs[proctype];
Assert(MyProc == auxproc);
/* Release any LW locks I am holding (see notes above) */
LWLockReleaseAll();
/* Release ownership of the process's latch, too */
DisownLatch(&MyProc->procLatch);
SpinLockAcquire(ProcStructLock);
/* Mark auxiliary proc no longer in use */
MyProc->pid = 0;
/* PGPROC struct isn't mine anymore */
MyProc = NULL;
/* Update shared estimate of spins_per_delay */
ProcGlobal->spins_per_delay = update_spins_per_delay(ProcGlobal->spins_per_delay);
SpinLockRelease(ProcStructLock);
}
void
SyncRepCleanupAtProcExit(int code, Datum arg)
{
if (!SHMQueueIsDetached(&(MyProc->syncRepLinks)))
{
LWLockAcquire(SyncRepLock, LW_EXCLUSIVE);
SHMQueueDelete(&(MyProc->syncRepLinks));
LWLockRelease(SyncRepLock);
}
DisownLatch(&MyProc->waitLatch);
}
/* Destroy the per-walsender data structure for this walsender process */
static void
WalSndKill(int code, Datum arg)
{
Assert(MyWalSnd != NULL);
/*
* Mark WalSnd struct no longer in use. Assume that no lock is required
* for this.
*/
MyWalSnd->pid = 0;
DisownLatch(&MyWalSnd->latch);
/* WalSnd struct isn't mine anymore */
MyWalSnd = NULL;
}
/*
* AuxiliaryProcKill() -- Cut-down version of ProcKill for auxiliary
* processes (bgwriter, etc). The PGPROC and sema are not released, only
* marked as not-in-use.
*/
static void
AuxiliaryProcKill(int code, Datum arg)
{
int proctype = DatumGetInt32(arg);
PGPROC *auxproc PG_USED_FOR_ASSERTS_ONLY;
PGPROC *proc;
Assert(proctype >= 0 && proctype < NUM_AUXILIARY_PROCS);
auxproc = &AuxiliaryProcs[proctype];
Assert(MyProc == auxproc);
/* Release any LW locks I am holding (see notes above) */
LWLockReleaseAll();
/*
* Reset MyLatch to the process local one. This is so that signal
* handlers et al can continue using the latch after the shared latch
* isn't ours anymore. After that clear MyProc and disown the shared
* latch.
*/
SwitchBackToLocalLatch();
proc = MyProc;
MyProc = NULL;
DisownLatch(&proc->procLatch);
SpinLockAcquire(ProcStructLock);
/* Mark auxiliary proc no longer in use */
proc->pid = 0;
/* Update shared estimate of spins_per_delay */
ProcGlobal->spins_per_delay = update_spins_per_delay(ProcGlobal->spins_per_delay);
SpinLockRelease(ProcStructLock);
}
/*
* ProcKill() -- Destroy the per-proc data structure for
* this process. Release any of its held LW locks.
*/
static void
ProcKill(int code, Datum arg)
{
/* use volatile pointer to prevent code rearrangement */
volatile PROC_HDR *procglobal = ProcGlobal;
PGPROC *proc;
Assert(MyProc != NULL);
/* Make sure we're out of the sync rep lists */
SyncRepCleanupAtProcExit();
#ifdef USE_ASSERT_CHECKING
{
int i;
/* Last process should have released all locks. */
for (i = 0; i < NUM_LOCK_PARTITIONS; i++)
Assert(SHMQueueEmpty(&(MyProc->myProcLocks[i])));
}
#endif
/*
* 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 ...
*/
LWLockReleaseAll();
/* Make sure active replication slots are released */
if (MyReplicationSlot != NULL)
ReplicationSlotRelease();
/*
* Reset MyLatch to the process local one. This is so that signal
* handlers et al can continue using the latch after the shared latch
* isn't ours anymore. After that clear MyProc and disown the shared
* latch.
*/
SwitchBackToLocalLatch();
proc = MyProc;
MyProc = NULL;
DisownLatch(&proc->procLatch);
SpinLockAcquire(ProcStructLock);
/* Return PGPROC structure (and semaphore) to appropriate freelist */
if (IsAnyAutoVacuumProcess())
{
proc->links.next = (SHM_QUEUE *) procglobal->autovacFreeProcs;
procglobal->autovacFreeProcs = proc;
}
else if (IsBackgroundWorker)
{
proc->links.next = (SHM_QUEUE *) procglobal->bgworkerFreeProcs;
procglobal->bgworkerFreeProcs = proc;
}
else
{
proc->links.next = (SHM_QUEUE *) procglobal->freeProcs;
procglobal->freeProcs = proc;
}
/* Update shared estimate of spins_per_delay */
procglobal->spins_per_delay = update_spins_per_delay(procglobal->spins_per_delay);
SpinLockRelease(ProcStructLock);
/*
* This process is no longer present in shared memory in any meaningful
* way, so tell the postmaster we've cleaned up acceptably well. (XXX
* autovac launcher should be included here someday)
*/
if (IsUnderPostmaster && !IsAutoVacuumLauncherProcess())
MarkPostmasterChildInactive();
/* wake autovac launcher if needed -- see comments in FreeWorkerInfo */
if (AutovacuumLauncherPid != 0)
kill(AutovacuumLauncherPid, SIGUSR2);
}
/*
* ProcKill() -- Destroy the per-proc data structure for
* this process. Release any of its held LW locks.
*/
static void
ProcKill(int code, Datum arg)
{
/* use volatile pointer to prevent code rearrangement */
volatile PROC_HDR *procglobal = ProcGlobal;
Assert(MyProc != NULL);
/* Make sure we're out of the sync rep lists */
SyncRepCleanupAtProcExit();
#ifdef USE_ASSERT_CHECKING
if (assert_enabled)
{
int i;
/* Last process should have released all locks. */
for (i = 0; i < NUM_LOCK_PARTITIONS; i++)
Assert(SHMQueueEmpty(&(MyProc->myProcLocks[i])));
}
#endif
/*
* 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 ...
*/
LWLockReleaseAll();
/* Release ownership of the process's latch, too */
DisownLatch(&MyProc->procLatch);
SpinLockAcquire(ProcStructLock);
/* Return PGPROC structure (and semaphore) to appropriate freelist */
if (IsAnyAutoVacuumProcess())
{
MyProc->links.next = (SHM_QUEUE *) procglobal->autovacFreeProcs;
procglobal->autovacFreeProcs = MyProc;
}
else
{
MyProc->links.next = (SHM_QUEUE *) procglobal->freeProcs;
procglobal->freeProcs = MyProc;
}
/* PGPROC struct isn't mine anymore */
MyProc = NULL;
/* Update shared estimate of spins_per_delay */
procglobal->spins_per_delay = update_spins_per_delay(procglobal->spins_per_delay);
SpinLockRelease(ProcStructLock);
/*
* This process is no longer present in shared memory in any meaningful
* way, so tell the postmaster we've cleaned up acceptably well. (XXX
* autovac launcher should be included here someday)
*/
if (IsUnderPostmaster && !IsAutoVacuumLauncherProcess())
MarkPostmasterChildInactive();
/* wake autovac launcher if needed -- see comments in FreeWorkerInfo */
if (AutovacuumLauncherPid != 0)
kill(AutovacuumLauncherPid, SIGUSR2);
}