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Significant cleanups in SysV IPC handling (shared mem and semaphores).

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IPC key assignment will now work correctly even when multiple postmasters
are using same logical port number (which is possible given -k switch).
There is only one shared-mem segment per postmaster now, not 3.
Rip out broken code for non-TAS case in bufmgr and xlog, substitute a
complete S_LOCK emulation using semaphores in spin.c.  TAS and non-TAS
logic is now exactly the same.
When deadlock is detected, "Deadlock detected" is now the elog(ERROR)
message, rather than a NOTICE that comes out before an unhelpful ERROR.
This commit is contained in:
Tom Lane
2000-11-28 23:27:57 +00:00
parent 914822713c
commit c715fdea26
27 changed files with 1172 additions and 1755 deletions
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4
src/include/storage/bufmgr.h
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@@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2000, PostgreSQL, Inc
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Id: bufmgr.h,v 1.43 2000/11/08 22:10:02 tgl Exp $
* $Id: bufmgr.h,v 1.44 2000/11/28 23:27:57 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -154,7 +154,7 @@ extern Buffer ReleaseAndReadBuffer(Buffer buffer, Relation relation,
BlockNumber blockNum);
extern int FlushBuffer(Buffer buffer, bool sync, bool release);
extern void InitBufferPool(IPCKey key);
extern void InitBufferPool(void);
extern void PrintBufferUsage(FILE *statfp);
extern void ResetBufferUsage(void);
extern void ResetBufferPool(bool isCommit);