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Get rid of the SpinLockAcquire/SpinLockAcquire_NoHoldoff distinction
in favor of having just one set of macros that don't do HOLD/RESUME_INTERRUPTS (hence, these correspond to the old SpinLockAcquire_NoHoldoff case). Given our coding rules for spinlock use, there is no reason to allow CHECK_FOR_INTERRUPTS to be done while holding a spinlock, and also there is no situation where ImmediateInterruptOK will be true while holding a spinlock. Therefore doing HOLD/RESUME_INTERRUPTS while taking/releasing a spinlock is just a waste of cycles. Qingqing Zhou and Tom Lane.
This commit is contained in:
Tom Lane
parent
e135d9631b
commit
195f164228
@ -7,7 +7,7 @@
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* Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* $PostgreSQL: pgsql/src/backend/access/transam/xlog.c,v 1.224 2005/12/28 23:22:50 tgl Exp $
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* $PostgreSQL: pgsql/src/backend/access/transam/xlog.c,v 1.225 2005/12/29 18:08:05 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -695,10 +695,10 @@ begin:;
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/* use volatile pointer to prevent code rearrangement */
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volatile XLogCtlData *xlogctl = XLogCtl;
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SpinLockAcquire_NoHoldoff(&xlogctl->info_lck);
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SpinLockAcquire(&xlogctl->info_lck);
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LogwrtRqst = xlogctl->LogwrtRqst;
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LogwrtResult = xlogctl->LogwrtResult;
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SpinLockRelease_NoHoldoff(&xlogctl->info_lck);
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SpinLockRelease(&xlogctl->info_lck);
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}
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/*
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@ -940,13 +940,13 @@ begin:;
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/* use volatile pointer to prevent code rearrangement */
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volatile XLogCtlData *xlogctl = XLogCtl;
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SpinLockAcquire_NoHoldoff(&xlogctl->info_lck);
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SpinLockAcquire(&xlogctl->info_lck);
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/* advance global request to include new block(s) */
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if (XLByteLT(xlogctl->LogwrtRqst.Write, WriteRqst))
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xlogctl->LogwrtRqst.Write = WriteRqst;
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/* update local result copy while I have the chance */
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LogwrtResult = xlogctl->LogwrtResult;
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SpinLockRelease_NoHoldoff(&xlogctl->info_lck);
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SpinLockRelease(&xlogctl->info_lck);
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}
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ProcLastRecEnd = RecPtr;
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@ -1175,11 +1175,11 @@ AdvanceXLInsertBuffer(void)
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/* use volatile pointer to prevent code rearrangement */
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volatile XLogCtlData *xlogctl = XLogCtl;
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SpinLockAcquire_NoHoldoff(&xlogctl->info_lck);
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SpinLockAcquire(&xlogctl->info_lck);
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if (XLByteLT(xlogctl->LogwrtRqst.Write, FinishedPageRqstPtr))
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xlogctl->LogwrtRqst.Write = FinishedPageRqstPtr;
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LogwrtResult = xlogctl->LogwrtResult;
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SpinLockRelease_NoHoldoff(&xlogctl->info_lck);
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SpinLockRelease(&xlogctl->info_lck);
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}
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update_needed = false; /* Did the shared-request update */
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@ -1560,13 +1560,13 @@ XLogWrite(XLogwrtRqst WriteRqst, bool flexible)
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/* use volatile pointer to prevent code rearrangement */
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volatile XLogCtlData *xlogctl = XLogCtl;
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SpinLockAcquire_NoHoldoff(&xlogctl->info_lck);
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SpinLockAcquire(&xlogctl->info_lck);
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xlogctl->LogwrtResult = LogwrtResult;
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if (XLByteLT(xlogctl->LogwrtRqst.Write, LogwrtResult.Write))
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xlogctl->LogwrtRqst.Write = LogwrtResult.Write;
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if (XLByteLT(xlogctl->LogwrtRqst.Flush, LogwrtResult.Flush))
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xlogctl->LogwrtRqst.Flush = LogwrtResult.Flush;
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SpinLockRelease_NoHoldoff(&xlogctl->info_lck);
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SpinLockRelease(&xlogctl->info_lck);
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}
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Write->LogwrtResult = LogwrtResult;
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@ -1618,11 +1618,11 @@ XLogFlush(XLogRecPtr record)
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/* use volatile pointer to prevent code rearrangement */
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volatile XLogCtlData *xlogctl = XLogCtl;
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SpinLockAcquire_NoHoldoff(&xlogctl->info_lck);
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SpinLockAcquire(&xlogctl->info_lck);
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if (XLByteLT(WriteRqstPtr, xlogctl->LogwrtRqst.Write))
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WriteRqstPtr = xlogctl->LogwrtRqst.Write;
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LogwrtResult = xlogctl->LogwrtResult;
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SpinLockRelease_NoHoldoff(&xlogctl->info_lck);
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SpinLockRelease(&xlogctl->info_lck);
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}
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/* done already? */
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@ -4984,10 +4984,10 @@ GetRedoRecPtr(void)
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/* use volatile pointer to prevent code rearrangement */
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volatile XLogCtlData *xlogctl = XLogCtl;
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SpinLockAcquire_NoHoldoff(&xlogctl->info_lck);
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SpinLockAcquire(&xlogctl->info_lck);
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Assert(XLByteLE(RedoRecPtr, xlogctl->Insert.RedoRecPtr));
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RedoRecPtr = xlogctl->Insert.RedoRecPtr;
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SpinLockRelease_NoHoldoff(&xlogctl->info_lck);
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SpinLockRelease(&xlogctl->info_lck);
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return RedoRecPtr;
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}
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@ -5165,9 +5165,9 @@ CreateCheckPoint(bool shutdown, bool force)
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/* use volatile pointer to prevent code rearrangement */
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volatile XLogCtlData *xlogctl = XLogCtl;
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SpinLockAcquire_NoHoldoff(&xlogctl->info_lck);
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SpinLockAcquire(&xlogctl->info_lck);
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RedoRecPtr = xlogctl->Insert.RedoRecPtr = checkPoint.redo;
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SpinLockRelease_NoHoldoff(&xlogctl->info_lck);
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SpinLockRelease(&xlogctl->info_lck);
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}
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/*
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@ -8,7 +8,7 @@
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*
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*
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* IDENTIFICATION
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* $PostgreSQL: pgsql/src/backend/storage/buffer/bufmgr.c,v 1.200 2005/11/22 18:17:19 momjian Exp $
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* $PostgreSQL: pgsql/src/backend/storage/buffer/bufmgr.c,v 1.201 2005/12/29 18:08:05 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -442,7 +442,7 @@ BufferAlloc(Relation reln,
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/*
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* Need to lock the buffer header too in order to change its tag.
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*/
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LockBufHdr_NoHoldoff(buf);
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LockBufHdr(buf);
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/*
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* Somebody could have pinned or re-dirtied the buffer while we were
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@ -453,7 +453,7 @@ BufferAlloc(Relation reln,
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if (buf->refcount == 1 && !(buf->flags & BM_DIRTY))
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break;
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UnlockBufHdr_NoHoldoff(buf);
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UnlockBufHdr(buf);
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BufTableDelete(&newTag);
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LWLockRelease(BufMappingLock);
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UnpinBuffer(buf, true, false /* evidently recently used */ );
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@ -473,7 +473,7 @@ BufferAlloc(Relation reln,
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buf->flags |= BM_TAG_VALID;
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buf->usage_count = 0;
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UnlockBufHdr_NoHoldoff(buf);
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UnlockBufHdr(buf);
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if (oldFlags & BM_TAG_VALID)
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BufTableDelete(&oldTag);
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@ -529,13 +529,13 @@ retry:
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*/
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LWLockAcquire(BufMappingLock, LW_EXCLUSIVE);
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/* Re-lock the buffer header (NoHoldoff since we have an LWLock) */
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LockBufHdr_NoHoldoff(buf);
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/* Re-lock the buffer header */
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LockBufHdr(buf);
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/* If it's changed while we were waiting for lock, do nothing */
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if (!BUFFERTAGS_EQUAL(buf->tag, oldTag))
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{
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UnlockBufHdr_NoHoldoff(buf);
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UnlockBufHdr(buf);
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LWLockRelease(BufMappingLock);
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return;
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}
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@ -551,7 +551,7 @@ retry:
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*/
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if (buf->refcount != 0)
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{
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UnlockBufHdr_NoHoldoff(buf);
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UnlockBufHdr(buf);
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LWLockRelease(BufMappingLock);
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/* safety check: should definitely not be our *own* pin */
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if (PrivateRefCount[buf->buf_id] != 0)
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@ -569,7 +569,7 @@ retry:
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buf->flags = 0;
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buf->usage_count = 0;
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UnlockBufHdr_NoHoldoff(buf);
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UnlockBufHdr(buf);
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/*
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* Remove the buffer from the lookup hashtable, if it was in there.
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@ -729,15 +729,10 @@ PinBuffer(volatile BufferDesc *buf)
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if (PrivateRefCount[b] == 0)
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{
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/*
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* Use NoHoldoff here because we don't want the unlock to be a
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* potential place to honor a QueryCancel request. (The caller should
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* be holding off interrupts anyway.)
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*/
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LockBufHdr_NoHoldoff(buf);
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LockBufHdr(buf);
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buf->refcount++;
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result = (buf->flags & BM_VALID) != 0;
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UnlockBufHdr_NoHoldoff(buf);
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UnlockBufHdr(buf);
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}
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else
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{
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@ -766,14 +761,11 @@ PinBuffer_Locked(volatile BufferDesc *buf)
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if (PrivateRefCount[b] == 0)
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buf->refcount++;
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/* NoHoldoff since we mustn't accept cancel interrupt here */
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UnlockBufHdr_NoHoldoff(buf);
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UnlockBufHdr(buf);
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PrivateRefCount[b]++;
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Assert(PrivateRefCount[b] > 0);
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ResourceOwnerRememberBuffer(CurrentResourceOwner,
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BufferDescriptorGetBuffer(buf));
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/* Now we can accept cancel */
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RESUME_INTERRUPTS();
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}
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/*
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@ -811,8 +803,7 @@ UnpinBuffer(volatile BufferDesc *buf, bool fixOwner, bool normalAccess)
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Assert(!LWLockHeldByMe(buf->content_lock));
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Assert(!LWLockHeldByMe(buf->io_in_progress_lock));
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/* NoHoldoff ensures we don't lose control before sending signal */
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LockBufHdr_NoHoldoff(buf);
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LockBufHdr(buf);
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/* Decrement the shared reference count */
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Assert(buf->refcount > 0);
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@ -841,11 +832,11 @@ UnpinBuffer(volatile BufferDesc *buf, bool fixOwner, bool normalAccess)
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int wait_backend_pid = buf->wait_backend_pid;
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buf->flags &= ~BM_PIN_COUNT_WAITER;
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UnlockBufHdr_NoHoldoff(buf);
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UnlockBufHdr(buf);
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ProcSendSignal(wait_backend_pid);
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}
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else
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UnlockBufHdr_NoHoldoff(buf);
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UnlockBufHdr(buf);
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/*
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* If VACUUM is releasing an otherwise-unused buffer, send it to the
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@ -1300,9 +1291,9 @@ FlushBuffer(volatile BufferDesc *buf, SMgrRelation reln)
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*/
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/* To check if block content changes while flushing. - vadim 01/17/97 */
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LockBufHdr_NoHoldoff(buf);
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LockBufHdr(buf);
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buf->flags &= ~BM_JUST_DIRTIED;
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UnlockBufHdr_NoHoldoff(buf);
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UnlockBufHdr(buf);
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smgrwrite(reln,
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buf->tag.blockNum,
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@ -1693,7 +1684,7 @@ UnlockBuffers(void)
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{
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HOLD_INTERRUPTS(); /* don't want to die() partway through... */
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LockBufHdr_NoHoldoff(buf);
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LockBufHdr(buf);
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/*
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* Don't complain if flag bit not set; it could have been reset but we
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@ -1703,7 +1694,7 @@ UnlockBuffers(void)
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buf->wait_backend_pid == MyProcPid)
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buf->flags &= ~BM_PIN_COUNT_WAITER;
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UnlockBufHdr_NoHoldoff(buf);
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UnlockBufHdr(buf);
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ProcCancelWaitForSignal();
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@ -1741,9 +1732,9 @@ LockBuffer(Buffer buffer, int mode)
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* that it's critical to set dirty bit *before* logging changes with
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* XLogInsert() - see comments in SyncOneBuffer().
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*/
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LockBufHdr_NoHoldoff(buf);
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LockBufHdr(buf);
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buf->flags |= (BM_DIRTY | BM_JUST_DIRTIED);
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UnlockBufHdr_NoHoldoff(buf);
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UnlockBufHdr(buf);
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}
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else
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elog(ERROR, "unrecognized buffer lock mode: %d", mode);
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@ -1773,9 +1764,9 @@ ConditionalLockBuffer(Buffer buffer)
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* that it's critical to set dirty bit *before* logging changes with
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* XLogInsert() - see comments in SyncOneBuffer().
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*/
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LockBufHdr_NoHoldoff(buf);
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LockBufHdr(buf);
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buf->flags |= (BM_DIRTY | BM_JUST_DIRTIED);
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UnlockBufHdr_NoHoldoff(buf);
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UnlockBufHdr(buf);
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return true;
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}
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@ -1827,25 +1818,25 @@ LockBufferForCleanup(Buffer buffer)
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{
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/* Try to acquire lock */
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LockBuffer(buffer, BUFFER_LOCK_EXCLUSIVE);
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LockBufHdr_NoHoldoff(bufHdr);
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LockBufHdr(bufHdr);
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Assert(bufHdr->refcount > 0);
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if (bufHdr->refcount == 1)
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{
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/* Successfully acquired exclusive lock with pincount 1 */
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UnlockBufHdr_NoHoldoff(bufHdr);
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UnlockBufHdr(bufHdr);
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return;
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}
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/* Failed, so mark myself as waiting for pincount 1 */
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if (bufHdr->flags & BM_PIN_COUNT_WAITER)
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{
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UnlockBufHdr_NoHoldoff(bufHdr);
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UnlockBufHdr(bufHdr);
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LockBuffer(buffer, BUFFER_LOCK_UNLOCK);
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elog(ERROR, "multiple backends attempting to wait for pincount 1");
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}
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bufHdr->wait_backend_pid = MyProcPid;
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bufHdr->flags |= BM_PIN_COUNT_WAITER;
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PinCountWaitBuf = bufHdr;
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UnlockBufHdr_NoHoldoff(bufHdr);
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UnlockBufHdr(bufHdr);
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LockBuffer(buffer, BUFFER_LOCK_UNLOCK);
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/* Wait to be signaled by UnpinBuffer() */
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ProcWaitForSignal();
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@ -1926,8 +1917,7 @@ StartBufferIO(volatile BufferDesc *buf, bool forInput)
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*/
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LWLockAcquire(buf->io_in_progress_lock, LW_EXCLUSIVE);
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/* NoHoldoff is OK since we now have an LWLock */
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LockBufHdr_NoHoldoff(buf);
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LockBufHdr(buf);
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if (!(buf->flags & BM_IO_IN_PROGRESS))
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break;
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@ -1938,7 +1928,7 @@ StartBufferIO(volatile BufferDesc *buf, bool forInput)
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* an error (see AbortBufferIO). If that's the case, we must wait for
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* him to get unwedged.
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*/
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UnlockBufHdr_NoHoldoff(buf);
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UnlockBufHdr(buf);
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LWLockRelease(buf->io_in_progress_lock);
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WaitIO(buf);
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}
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@ -1948,14 +1938,14 @@ StartBufferIO(volatile BufferDesc *buf, bool forInput)
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if (forInput ? (buf->flags & BM_VALID) : !(buf->flags & BM_DIRTY))
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{
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/* someone else already did the I/O */
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UnlockBufHdr_NoHoldoff(buf);
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UnlockBufHdr(buf);
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LWLockRelease(buf->io_in_progress_lock);
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return false;
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}
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buf->flags |= BM_IO_IN_PROGRESS;
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UnlockBufHdr_NoHoldoff(buf);
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UnlockBufHdr(buf);
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InProgressBuf = buf;
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IsForInput = forInput;
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@ -1986,8 +1976,7 @@ TerminateBufferIO(volatile BufferDesc *buf, bool clear_dirty,
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{
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Assert(buf == InProgressBuf);
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/* NoHoldoff is OK since we must have an LWLock */
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LockBufHdr_NoHoldoff(buf);
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LockBufHdr(buf);
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Assert(buf->flags & BM_IO_IN_PROGRESS);
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buf->flags &= ~(BM_IO_IN_PROGRESS | BM_IO_ERROR);
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@ -1995,7 +1984,7 @@ TerminateBufferIO(volatile BufferDesc *buf, bool clear_dirty,
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buf->flags &= ~BM_DIRTY;
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buf->flags |= set_flag_bits;
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UnlockBufHdr_NoHoldoff(buf);
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UnlockBufHdr(buf);
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InProgressBuf = NULL;
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@ -2026,15 +2015,14 @@ AbortBufferIO(void)
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*/
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LWLockAcquire(buf->io_in_progress_lock, LW_EXCLUSIVE);
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/* NoHoldoff is OK since we now have an LWLock */
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LockBufHdr_NoHoldoff(buf);
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LockBufHdr(buf);
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Assert(buf->flags & BM_IO_IN_PROGRESS);
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if (IsForInput)
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{
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Assert(!(buf->flags & BM_DIRTY));
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/* We'd better not think buffer is valid yet */
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Assert(!(buf->flags & BM_VALID));
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UnlockBufHdr_NoHoldoff(buf);
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UnlockBufHdr(buf);
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}
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else
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{
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@ -2042,7 +2030,7 @@ AbortBufferIO(void)
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sv_flags = buf->flags;
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Assert(sv_flags & BM_DIRTY);
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UnlockBufHdr_NoHoldoff(buf);
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UnlockBufHdr(buf);
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/* Issue notice if this is not the first failure... */
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if (sv_flags & BM_IO_ERROR)
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{
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@ -8,7 +8,7 @@
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*
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*
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* IDENTIFICATION
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* $PostgreSQL: pgsql/src/backend/storage/ipc/shmem.c,v 1.88 2005/11/22 18:17:20 momjian Exp $
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* $PostgreSQL: pgsql/src/backend/storage/ipc/shmem.c,v 1.89 2005/12/29 18:08:05 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -58,6 +58,7 @@
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#include "postgres.h"
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#include "access/transam.h"
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#include "miscadmin.h"
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#include "storage/pg_shmem.h"
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#include "storage/spin.h"
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#include "utils/tqual.h"
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@ -15,7 +15,7 @@
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* IDENTIFICATION
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* $PostgreSQL: pgsql/src/backend/storage/lmgr/lwlock.c,v 1.36 2005/12/11 21:02:18 tgl Exp $
|
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* $PostgreSQL: pgsql/src/backend/storage/lmgr/lwlock.c,v 1.37 2005/12/29 18:08:05 tgl Exp $
|
||||
*
|
||||
*-------------------------------------------------------------------------
|
||||
*/
|
||||
@ -24,6 +24,7 @@
|
||||
#include "access/clog.h"
|
||||
#include "access/multixact.h"
|
||||
#include "access/subtrans.h"
|
||||
#include "miscadmin.h"
|
||||
#include "storage/lwlock.h"
|
||||
#include "storage/proc.h"
|
||||
#include "storage/spin.h"
|
||||
@ -301,7 +302,7 @@ LWLockAcquire(LWLockId lockid, LWLockMode mode)
|
||||
bool mustwait;
|
||||
|
||||
/* Acquire mutex. Time spent holding mutex should be short! */
|
||||
SpinLockAcquire_NoHoldoff(&lock->mutex);
|
||||
SpinLockAcquire(&lock->mutex);
|
||||
|
||||
/* If retrying, allow LWLockRelease to release waiters again */
|
||||
if (retry)
|
||||
@ -340,7 +341,7 @@ LWLockAcquire(LWLockId lockid, LWLockMode mode)
|
||||
* memory initialization.
|
||||
*/
|
||||
if (proc == NULL)
|
||||
elog(FATAL, "cannot wait without a PGPROC structure");
|
||||
elog(PANIC, "cannot wait without a PGPROC structure");
|
||||
|
||||
proc->lwWaiting = true;
|
||||
proc->lwExclusive = (mode == LW_EXCLUSIVE);
|
||||
@ -352,7 +353,7 @@ LWLockAcquire(LWLockId lockid, LWLockMode mode)
|
||||
lock->tail = proc;
|
||||
|
||||
/* Can release the mutex now */
|
||||
SpinLockRelease_NoHoldoff(&lock->mutex);
|
||||
SpinLockRelease(&lock->mutex);
|
||||
|
||||
/*
|
||||
* Wait until awakened.
|
||||
@ -384,7 +385,7 @@ LWLockAcquire(LWLockId lockid, LWLockMode mode)
|
||||
}
|
||||
|
||||
/* We are done updating shared state of the lock itself. */
|
||||
SpinLockRelease_NoHoldoff(&lock->mutex);
|
||||
SpinLockRelease(&lock->mutex);
|
||||
|
||||
/* Add lock to list of locks held by this backend */
|
||||
held_lwlocks[num_held_lwlocks++] = lockid;
|
||||
@ -423,7 +424,7 @@ LWLockConditionalAcquire(LWLockId lockid, LWLockMode mode)
|
||||
HOLD_INTERRUPTS();
|
||||
|
||||
/* Acquire mutex. Time spent holding mutex should be short! */
|
||||
SpinLockAcquire_NoHoldoff(&lock->mutex);
|
||||
SpinLockAcquire(&lock->mutex);
|
||||
|
||||
/* If I can get the lock, do so quickly. */
|
||||
if (mode == LW_EXCLUSIVE)
|
||||
@ -448,7 +449,7 @@ LWLockConditionalAcquire(LWLockId lockid, LWLockMode mode)
|
||||
}
|
||||
|
||||
/* We are done updating shared state of the lock itself. */
|
||||
SpinLockRelease_NoHoldoff(&lock->mutex);
|
||||
SpinLockRelease(&lock->mutex);
|
||||
|
||||
if (mustwait)
|
||||
{
|
||||
@ -494,7 +495,7 @@ LWLockRelease(LWLockId lockid)
|
||||
held_lwlocks[i] = held_lwlocks[i + 1];
|
||||
|
||||
/* Acquire mutex. Time spent holding mutex should be short! */
|
||||
SpinLockAcquire_NoHoldoff(&lock->mutex);
|
||||
SpinLockAcquire(&lock->mutex);
|
||||
|
||||
/* Release my hold on lock */
|
||||
if (lock->exclusive > 0)
|
||||
@ -542,7 +543,7 @@ LWLockRelease(LWLockId lockid)
|
||||
}
|
||||
|
||||
/* We are done updating shared state of the lock itself. */
|
||||
SpinLockRelease_NoHoldoff(&lock->mutex);
|
||||
SpinLockRelease(&lock->mutex);
|
||||
|
||||
/*
|
||||
* Awaken any waiters I removed from the queue.
|
||||
|
||||
@ -8,7 +8,7 @@
|
||||
* Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
|
||||
* Portions Copyright (c) 1994, Regents of the University of California
|
||||
*
|
||||
* $PostgreSQL: pgsql/src/include/storage/buf_internals.h,v 1.83 2005/11/22 18:17:31 momjian Exp $
|
||||
* $PostgreSQL: pgsql/src/include/storage/buf_internals.h,v 1.84 2005/12/29 18:08:05 tgl Exp $
|
||||
*
|
||||
*-------------------------------------------------------------------------
|
||||
*/
|
||||
@ -138,24 +138,16 @@ typedef struct sbufdesc
|
||||
#define FREENEXT_NOT_IN_LIST (-2)
|
||||
|
||||
/*
|
||||
* Macros for acquiring/releasing a buffer header's spinlock. The
|
||||
* NoHoldoff cases may be used when we know that we hold some LWLock
|
||||
* and therefore interrupts are already held off. Do not apply these
|
||||
* to local buffers!
|
||||
* Macros for acquiring/releasing a shared buffer header's spinlock.
|
||||
* Do not apply these to local buffers!
|
||||
*
|
||||
* Note: as a general coding rule, if you are using these then you probably
|
||||
* want to be using a volatile-qualified pointer to the buffer header, to
|
||||
* need to be using a volatile-qualified pointer to the buffer header, to
|
||||
* ensure that the compiler doesn't rearrange accesses to the header to
|
||||
* occur before or after the spinlock is acquired/released.
|
||||
*/
|
||||
#define LockBufHdr(bufHdr) \
|
||||
SpinLockAcquire(&(bufHdr)->buf_hdr_lock)
|
||||
#define UnlockBufHdr(bufHdr) \
|
||||
SpinLockRelease(&(bufHdr)->buf_hdr_lock)
|
||||
#define LockBufHdr_NoHoldoff(bufHdr) \
|
||||
SpinLockAcquire_NoHoldoff(&(bufHdr)->buf_hdr_lock)
|
||||
#define UnlockBufHdr_NoHoldoff(bufHdr) \
|
||||
SpinLockRelease_NoHoldoff(&(bufHdr)->buf_hdr_lock)
|
||||
#define LockBufHdr(bufHdr) SpinLockAcquire(&(bufHdr)->buf_hdr_lock)
|
||||
#define UnlockBufHdr(bufHdr) SpinLockRelease(&(bufHdr)->buf_hdr_lock)
|
||||
|
||||
|
||||
/* in buf_init.c */
|
||||
|
||||
@ -14,17 +14,9 @@
|
||||
* Acquire a spinlock, waiting if necessary.
|
||||
* Time out and abort() if unable to acquire the lock in a
|
||||
* "reasonable" amount of time --- typically ~ 1 minute.
|
||||
* Cancel/die interrupts are held off until the lock is released.
|
||||
*
|
||||
* void SpinLockRelease(volatile slock_t *lock)
|
||||
* Unlock a previously acquired lock.
|
||||
* Release the cancel/die interrupt holdoff.
|
||||
*
|
||||
* void SpinLockAcquire_NoHoldoff(volatile slock_t *lock)
|
||||
* void SpinLockRelease_NoHoldoff(volatile slock_t *lock)
|
||||
* Same as above, except no interrupt holdoff processing is done.
|
||||
* This pair of macros may be used when there is a surrounding
|
||||
* interrupt holdoff.
|
||||
*
|
||||
* bool SpinLockFree(slock_t *lock)
|
||||
* Tests if the lock is free. Returns TRUE if free, FALSE if locked.
|
||||
@ -43,14 +35,21 @@
|
||||
* protects shared data with a spinlock MUST reference that shared
|
||||
* data through a volatile pointer.
|
||||
*
|
||||
* Keep in mind the coding rule that spinlocks must not be held for more
|
||||
* than a few instructions. In particular, we assume it is not possible
|
||||
* for a CHECK_FOR_INTERRUPTS() to occur while holding a spinlock, and so
|
||||
* it is not necessary to do HOLD/RESUME_INTERRUPTS() in these macros.
|
||||
*
|
||||
* These macros are implemented in terms of hardware-dependent macros
|
||||
* supplied by s_lock.h.
|
||||
* supplied by s_lock.h. There is not currently any extra functionality
|
||||
* added by this header, but there has been in the past and may someday
|
||||
* be again.
|
||||
*
|
||||
*
|
||||
* Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
|
||||
* Portions Copyright (c) 1994, Regents of the University of California
|
||||
*
|
||||
* $PostgreSQL: pgsql/src/include/storage/spin.h,v 1.26 2005/10/13 06:17:34 neilc Exp $
|
||||
* $PostgreSQL: pgsql/src/include/storage/spin.h,v 1.27 2005/12/29 18:08:05 tgl Exp $
|
||||
*
|
||||
*-------------------------------------------------------------------------
|
||||
*/
|
||||
@ -58,26 +57,13 @@
|
||||
#define SPIN_H
|
||||
|
||||
#include "storage/s_lock.h"
|
||||
#include "miscadmin.h"
|
||||
|
||||
|
||||
#define SpinLockInit(lock) S_INIT_LOCK(lock)
|
||||
|
||||
#define SpinLockAcquire(lock) \
|
||||
do { \
|
||||
HOLD_INTERRUPTS(); \
|
||||
S_LOCK(lock); \
|
||||
} while (0)
|
||||
#define SpinLockAcquire(lock) S_LOCK(lock)
|
||||
|
||||
#define SpinLockAcquire_NoHoldoff(lock) S_LOCK(lock)
|
||||
|
||||
#define SpinLockRelease(lock) \
|
||||
do { \
|
||||
S_UNLOCK(lock); \
|
||||
RESUME_INTERRUPTS(); \
|
||||
} while (0)
|
||||
|
||||
#define SpinLockRelease_NoHoldoff(lock) S_UNLOCK(lock)
|
||||
#define SpinLockRelease(lock) S_UNLOCK(lock)
|
||||
|
||||
#define SpinLockFree(lock) S_LOCK_FREE(lock)
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user