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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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8
src/include/storage/sinvaladt.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: sinvaladt.h,v 1.23 2000/11/12 20:51:52 tgl Exp $
* $Id: sinvaladt.h,v 1.24 2000/11/28 23:27:57 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -107,15 +107,13 @@ typedef struct SISeg
} SISeg;
extern SISeg *shmInvalBuffer; /* pointer to the shared buffer segment,
* set by SISegmentAttach() */
extern SISeg *shmInvalBuffer; /* pointer to the shared inval buffer */
/*
* prototypes for functions in sinvaladt.c
*/
extern int SISegmentInit(bool createNewSegment, IPCKey key,
int maxBackends);
extern void SIBufferInit(int maxBackends);
extern int SIBackendInit(SISeg *segP);
extern bool SIInsertDataEntry(SISeg *segP, SharedInvalidData *data);