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Code

Improve LOCK_DEBUG logging code for LWLocks.

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This commit is contained in:
Tom Lane 2001-12-28 23:26:04 +00:00
parent ce286ff6b5
commit 198152730b
1 changed files with 17 additions and 2 deletions
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19
src/backend/storage/lmgr/lwlock.c
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@ -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 1.4 2001/12/10 21:13:50 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/storage/lmgr/lwlock.c,v 1.5 2001/12/28 23:26:04 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -64,7 +64,7 @@ static LWLockId held_lwlocks[MAX_SIMUL_LWLOCKS];
bool Trace_lwlocks = false;
inline static void
PRINT_LWDEBUG(const char *where, LWLockId lockid, const LWLock *lock)
PRINT_LWDEBUG(const char *where, LWLockId lockid, const volatile LWLock *lock)
{
if (Trace_lwlocks)
elog(DEBUG, "%s(%d): excl %d shared %d head %p",
@ -72,8 +72,17 @@ PRINT_LWDEBUG(const char *where, LWLockId lockid, const LWLock *lock)
(int) lock->exclusive, lock->shared, lock->head);
}
inline static void
LOG_LWDEBUG(const char *where, LWLockId lockid, const char *msg)
{
if (Trace_lwlocks)
elog(DEBUG, "%s(%d): %s",
where, (int) lockid, msg);
}
#else /* not LOCK_DEBUG */
#define PRINT_LWDEBUG(a,b,c)
#define LOG_LWDEBUG(a,b,c)
#endif /* LOCK_DEBUG */
@ -265,6 +274,8 @@ LWLockAcquire(LWLockId lockid, LWLockMode mode)
* received, so that the lock manager or signal manager will see
* the received signal when it next waits.
*/
LOG_LWDEBUG("LWLockAcquire", lockid, "waiting");
for (;;)
{
/* "false" means cannot accept cancel/die interrupt here. */
@ -274,6 +285,8 @@ LWLockAcquire(LWLockId lockid, LWLockMode mode)
extraWaits++;
}
LOG_LWDEBUG("LWLockAcquire", lockid, "awakened");
/*
* The awakener already updated the lock struct's state, so we
* don't need to do anything more to it. Just need to fix the
@ -352,6 +365,7 @@ LWLockConditionalAcquire(LWLockId lockid, LWLockMode mode)
{
/* Failed to get lock, so release interrupt holdoff */
RESUME_INTERRUPTS();
LOG_LWDEBUG("LWLockConditionalAcquire", lockid, "failed");
}
else
{
@ -448,6 +462,7 @@ LWLockRelease(LWLockId lockid)
*/
while (head != NULL)
{
LOG_LWDEBUG("LWLockRelease", lockid, "release waiter");
proc = head;
head = proc->lwWaitLink;
proc->lwWaitLink = NULL;