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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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43
src/backend/storage/ipc/sinval.c
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@@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/storage/ipc/sinval.c,v 1.23 2000/11/12 20:51:51 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/storage/ipc/sinval.c,v 1.24 2000/11/28 23:27:56 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -27,52 +27,23 @@
SPINLOCK SInvalLock = (SPINLOCK) NULL;
/****************************************************************************/
/* CreateSharedInvalidationState() Create a buffer segment */
/* CreateSharedInvalidationState() Initialize SI buffer */
/* */
/* should be called only by the POSTMASTER */
/****************************************************************************/
void
CreateSharedInvalidationState(IPCKey key, int maxBackends)
CreateSharedInvalidationState(int maxBackends)
{
int status;
/* SInvalLock gets set in spin.c, during spinlock init */
status = SISegmentInit(true, IPCKeyGetSIBufferMemoryBlock(key),
maxBackends);
if (status == -1)
elog(FATAL, "CreateSharedInvalidationState: failed segment init");
}
/****************************************************************************/
/* AttachSharedInvalidationState(key) Attach to existing buffer segment */
/* */
/* should be called by each backend during startup */
/****************************************************************************/
void
AttachSharedInvalidationState(IPCKey key)
{
int status;
if (key == PrivateIPCKey)
{
CreateSharedInvalidationState(key, 16);
return;
}
/* SInvalLock gets set in spin.c, during spinlock init */
status = SISegmentInit(false, IPCKeyGetSIBufferMemoryBlock(key), 0);
if (status == -1)
elog(FATAL, "AttachSharedInvalidationState: failed segment init");
/* SInvalLock must be initialized already, during spinlock init */
SIBufferInit(maxBackends);
}
/*
* InitSharedInvalidationState
* InitBackendSharedInvalidationState
* Initialize new backend's state info in buffer segment.
* Must be called after AttachSharedInvalidationState().
*/
void
InitSharedInvalidationState(void)
InitBackendSharedInvalidationState(void)
{
SpinAcquire(SInvalLock);
if (!SIBackendInit(shmInvalBuffer))