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Remove BufferLocks[] array in favor of a single pointer to the buffer

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(if any) currently waited for by LockBufferForCleanup(), which is all
that we were using it for anymore.  Saves some space and eliminates
proportional-to-NBuffers slowdown in UnlockBuffers().
This commit is contained in:
Tom Lane
2004-10-16 18:05:07 +00:00
parent 72f9013741
commit 1c2de47746
3 changed files with 35 additions and 56 deletions
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16
src/include/storage/buf_internals.h
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@@ -8,7 +8,7 @@
* Portions Copyright (c) 1996-2004, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/storage/buf_internals.h,v 1.73 2004/08/29 05:06:58 momjian Exp $
* $PostgreSQL: pgsql/src/include/storage/buf_internals.h,v 1.74 2004/10/16 18:05:07 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -75,8 +75,7 @@ typedef struct buftag
)
/*
* BufferDesc -- shared buffer cache metadata for a single
* shared buffer descriptor.
* BufferDesc -- shared descriptor/state data for a single shared buffer.
*/
typedef struct sbufdesc
{
@@ -108,16 +107,6 @@ typedef struct sbufdesc
#define BufferDescriptorGetBuffer(bdesc) ((bdesc)->buf_id + 1)
/*
* Each backend has its own BufferLocks[] array holding flag bits
* showing what locks it has set on each buffer.
*
* We have to free these locks during ereport(ERROR)...
*/
#define BL_IO_IN_PROGRESS (1 << 0) /* unimplemented */
#define BL_PIN_COUNT_LOCK (1 << 1)
/* entry for buffer lookup hashtable */
typedef struct
{
@@ -206,7 +195,6 @@ extern void BufTableDelete(BufferTag *tagPtr);
/* bufmgr.c */
extern BufferDesc *BufferDescriptors;
extern bits8 *BufferLocks;
/* localbuf.c */
extern BufferDesc *LocalBufferDescriptors;