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Fix failure in CreateCheckPoint on some Alpha boxes --- it's not OK to

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assume that TAS() will always succeed the first time, even if the lock
is known to be free.  Also, make sure that code will eventually time out
and report a stuck spinlock, rather than looping forever.  Small cleanups
in s_lock.h, too.
This commit is contained in:
Tom Lane
2000-12-29 21:31:21 +00:00
parent 7d363c4c33
commit 7f60b81e1a
4 changed files with 196 additions and 179 deletions
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6
src/backend/storage/buffer/bufmgr.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/storage/buffer/bufmgr.c,v 1.100 2000/12/28 13:00:21 vadim Exp $
* $Header: /cvsroot/pgsql/src/backend/storage/buffer/bufmgr.c,v 1.101 2000/12/29 21:31:21 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -1987,7 +1987,7 @@ LockBuffer(Buffer buffer, int mode)
while (buf->ri_lock || buf->w_lock)
{
S_UNLOCK(&(buf->cntx_lock));
s_lock_sleep(i++);
S_LOCK_SLEEP(&(buf->cntx_lock), i++);
S_LOCK(&(buf->cntx_lock));
}
(buf->r_locks)++;
@ -2013,7 +2013,7 @@ LockBuffer(Buffer buffer, int mode)
buf->ri_lock = true;
}
S_UNLOCK(&(buf->cntx_lock));
s_lock_sleep(i++);
S_LOCK_SLEEP(&(buf->cntx_lock), i++);
S_LOCK(&(buf->cntx_lock));
}
buf->w_lock = true;