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Split the shared-memory array of PGPROC pointers out of the sinval

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communication structure, and make it its own module with its own lock.
This should reduce contention at least a little, and it definitely makes
the code seem cleaner.  Per my recent proposal.
This commit is contained in:
Tom Lane
2005-05-19 21:35:48 +00:00
parent 6910032a56
commit ee3b71f6bc
30 changed files with 923 additions and 860 deletions
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10
src/backend/storage/buffer/bufmgr.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/storage/buffer/bufmgr.c,v 1.188 2005/03/20 22:00:53 tgl Exp $
* $PostgreSQL: pgsql/src/backend/storage/buffer/bufmgr.c,v 1.189 2005/05/19 21:35:46 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -825,11 +825,11 @@ UnpinBuffer(BufferDesc *buf, bool fixOwner, bool trashOK)
buf->refcount == 1)
{
/* we just released the last pin other than the waiter's */
BackendId wait_backend_id = buf->wait_backend_id;
int wait_backend_pid = buf->wait_backend_pid;
buf->flags &= ~BM_PIN_COUNT_WAITER;
UnlockBufHdr_NoHoldoff(buf);
ProcSendSignal(wait_backend_id);
ProcSendSignal(wait_backend_pid);
}
else
UnlockBufHdr_NoHoldoff(buf);
@ -1678,7 +1678,7 @@ UnlockBuffers(void)
* signal.
*/
if ((buf->flags & BM_PIN_COUNT_WAITER) != 0 &&
buf->wait_backend_id == MyBackendId)
buf->wait_backend_pid == MyProcPid)
buf->flags &= ~BM_PIN_COUNT_WAITER;
UnlockBufHdr_NoHoldoff(buf);
@ -1820,7 +1820,7 @@ LockBufferForCleanup(Buffer buffer)
LockBuffer(buffer, BUFFER_LOCK_UNLOCK);
elog(ERROR, "multiple backends attempting to wait for pincount 1");
}
bufHdr->wait_backend_id = MyBackendId;
bufHdr->wait_backend_pid = MyProcPid;
bufHdr->flags |= BM_PIN_COUNT_WAITER;
PinCountWaitBuf = bufHdr;
UnlockBufHdr_NoHoldoff(bufHdr);