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| author | Vadim B. Mikheev <vadim4o@yahoo.com> | 1998-12-15 12:47:01 +0000 |
|---|---|---|
| committer | Vadim B. Mikheev <vadim4o@yahoo.com> | 1998-12-15 12:47:01 +0000 |
| commit | 3f7fbf85dc5b42dfd33c803efe6c90533773576a (patch) | |
| tree | df8f84075ae7a27fa6b7ec0d063a03898e0b1bbb /src/include/storage/bufmgr.h | |
| parent | c5a27161a188b235ce3c0afb1b12e8942ac8e963 (diff) | |
| download | postgresql-3f7fbf85dc5b42dfd33c803efe6c90533773576a.tar.gz | |
Initial MVCC code.
New code for locking buffer' context.
Diffstat (limited to 'src/include/storage/bufmgr.h')
| -rw-r--r-- | src/include/storage/bufmgr.h | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/src/include/storage/bufmgr.h b/src/include/storage/bufmgr.h index 1948e813ee..22f66c2295 100644 --- a/src/include/storage/bufmgr.h +++ b/src/include/storage/bufmgr.h @@ -6,7 +6,7 @@ * * Copyright (c) 1994, Regents of the University of California * - * $Id: bufmgr.h,v 1.23 1998/10/08 18:30:43 momjian Exp $ + * $Id: bufmgr.h,v 1.24 1998/12/15 12:46:56 vadim Exp $ * *------------------------------------------------------------------------- */ @@ -74,6 +74,14 @@ extern int ShowPinTrace; #define BUFFER_LATE_WRITE 1 /* delayed write: mark as DIRTY */ /* + * Buffer context lock modes + */ +#define BUFFER_LOCK_UNLOCK 0 +#define BUFFER_LOCK_SHARE 1 +#define BUFFER_LOCK_EXCLUSIVE 2 + + +/* * BufferIsValid -- * True iff the refcnt of the local buffer is > 0 * Note: @@ -155,4 +163,7 @@ extern void BufferRefCountRestore(int *refcountsave); extern int SetBufferWriteMode(int mode); extern void SetBufferCommitInfoNeedsSave(Buffer buffer); +extern void UnlockBuffers(void); +extern void LockBuffer(Buffer buffer, int mode); + #endif /* !defined(BufMgrIncluded) */ |