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Initial MVCC code.

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New code for locking buffer' context.
This commit is contained in:
Vadim B. Mikheev
1998-12-15 12:47:01 +00:00
parent c5a27161a1
commit 3f7fbf85dc
65 changed files with 1391 additions and 1282 deletions
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25
src/backend/storage/buffer/buf_init.c
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@ -7,7 +7,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/storage/buffer/buf_init.c,v 1.19 1998/09/01 04:31:39 momjian Exp $
* $Header: /cvsroot/pgsql/src/backend/storage/buffer/buf_init.c,v 1.20 1998/12/15 12:46:18 vadim Exp $
*
*-------------------------------------------------------------------------
*/
@ -62,13 +62,13 @@ BufferBlock BufferBlocks;
#ifndef HAS_TEST_AND_SET
long *NWaitIOBackendP;
#endif
extern IpcSemaphoreId WaitIOSemId;
long *PrivateRefCount; /* also used in freelist.c */
long *LastRefCount; /* refcounts of last ExecMain level */
bits8 *BufferLocks; /* */
long *CommitInfoNeedsSave;/* to write buffers where we have filled
* in t_infomask */
@ -146,21 +146,6 @@ InitBufferPool(IPCKey key)
foundDescs;
int i;
/* check padding of BufferDesc and BufferHdr */
/*
* we need both checks because a sbufdesc_padded >
* PADDED_SBUFDESC_SIZE will shrink sbufdesc to the required size,
* which is bad
*/
if (sizeof(struct sbufdesc) != PADDED_SBUFDESC_SIZE ||
sizeof(struct sbufdesc_unpadded) > PADDED_SBUFDESC_SIZE)
elog(ERROR, "Internal error: sbufdesc does not have the proper size, "
"contact the Postgres developers");
if (sizeof(struct sbufdesc_unpadded) <= PADDED_SBUFDESC_SIZE / 2)
elog(ERROR, "Internal error: sbufdesc is greatly over-sized, "
"contact the Postgres developers");
Data_Descriptors = NBuffers;
Free_List_Descriptor = Data_Descriptors;
Lookup_List_Descriptor = Data_Descriptors + 1;
@ -232,6 +217,7 @@ InitBufferPool(IPCKey key)
buf->buf_id = i;
#ifdef HAS_TEST_AND_SET
S_INIT_LOCK(&(buf->io_in_progress_lock));
S_INIT_LOCK(&(buf->cntx_lock));
#endif
}
@ -252,10 +238,15 @@ InitBufferPool(IPCKey key)
WaitIOSemId = IpcSemaphoreCreate(IPCKeyGetWaitIOSemaphoreKey(key),
1, IPCProtection, 0, 1, &status);
WaitCLSemId = IpcSemaphoreCreate(IPCKeyGetWaitCLSemaphoreKey(key),
1, IPCProtection,
IpcSemaphoreDefaultStartValue,
1, &status);
}
#endif
PrivateRefCount = (long *) calloc(NBuffers, sizeof(long));
LastRefCount = (long *) calloc(NBuffers, sizeof(long));
BufferLocks = (bits8*) calloc (NBuffers, sizeof(bits8));
CommitInfoNeedsSave = (long *) calloc(NBuffers, sizeof(long));
}