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Create an internal semaphore API that is not tied to SysV semaphores.

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As proof of concept, provide an alternate implementation based on POSIX
semaphores.  Also push the SysV shared-memory implementation into a
separate file so that it can be replaced conveniently.
This commit is contained in:
Tom Lane
2002-05-05 00:03:29 +00:00
parent 91fc10fdac
commit 72a3902a66
37 changed files with 1659 additions and 1370 deletions
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8
src/backend/storage/lmgr/lwlock.c
View File

@@ -15,7 +15,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/storage/lmgr/lwlock.c,v 1.9 2002/03/02 21:39:29 momjian Exp $
* $Header: /cvsroot/pgsql/src/backend/storage/lmgr/lwlock.c,v 1.10 2002/05/05 00:03:28 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -302,7 +302,7 @@ LWLockAcquire(LWLockId lockid, LWLockMode mode)
for (;;)
{
/* "false" means cannot accept cancel/die interrupt here. */
IpcSemaphoreLock(proc->sem.semId, proc->sem.semNum, false);
PGSemaphoreLock(&proc->sem, false);
if (!proc->lwWaiting)
break;
extraWaits++;
@@ -325,7 +325,7 @@ LWLockAcquire(LWLockId lockid, LWLockMode mode)
* Fix the process wait semaphore's count for any absorbed wakeups.
*/
while (extraWaits-- > 0)
IpcSemaphoreUnlock(proc->sem.semId, proc->sem.semNum);
PGSemaphoreUnlock(&proc->sem);
}
/*
@@ -485,7 +485,7 @@ LWLockRelease(LWLockId lockid)
head = proc->lwWaitLink;
proc->lwWaitLink = NULL;
proc->lwWaiting = false;
IpcSemaphoreUnlock(proc->sem.semId, proc->sem.semNum);
PGSemaphoreUnlock(&proc->sem);
}
/*