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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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7
src/backend/storage/buffer/buf_init.c
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@@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/storage/buffer/buf_init.c,v 1.68 2004/08/29 05:06:47 momjian Exp $
* $PostgreSQL: pgsql/src/backend/storage/buffer/buf_init.c,v 1.69 2004/10/16 18:05:06 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -20,9 +20,7 @@
BufferDesc *BufferDescriptors;
Block *BufferBlockPointers;
int32 *PrivateRefCount; /* also used in freelist.c */
bits8 *BufferLocks; /* flag bits showing locks I have set */
int32 *PrivateRefCount;
/* statistics counters */
long int ReadBufferCount;
@@ -177,7 +175,6 @@ InitBufferPoolAccess(void)
sizeof(*BufferBlockPointers));
PrivateRefCount = (int32 *) calloc(NBuffers,
sizeof(*PrivateRefCount));
BufferLocks = (bits8 *) calloc(NBuffers, sizeof(*BufferLocks));
/*
* Convert shmem offsets into addresses as seen by this process. This