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Split the shared-memory array of PGPROC pointers out of the sinval

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communication structure, and make it its own module with its own lock.
This should reduce contention at least a little, and it definitely makes
the code seem cleaner.  Per my recent proposal.
This commit is contained in:
Tom Lane
2005-05-19 21:35:48 +00:00
parent 6910032a56
commit ee3b71f6bc
30 changed files with 923 additions and 860 deletions
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9
src/backend/storage/ipc/sinvaladt.c
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@@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/storage/ipc/sinvaladt.c,v 1.58 2004/12/31 22:00:56 pgsql Exp $
* $PostgreSQL: pgsql/src/backend/storage/ipc/sinvaladt.c,v 1.59 2005/05/19 21:35:46 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -17,10 +17,12 @@
#include "miscadmin.h"
#include "storage/backendid.h"
#include "storage/ipc.h"
#include "storage/lwlock.h"
#include "storage/pmsignal.h"
#include "storage/proc.h"
#include "storage/shmem.h"
#include "storage/sinvaladt.h"
SISeg *shmInvalBuffer;
static void CleanupInvalidationState(int status, Datum arg);
@@ -72,7 +74,6 @@ SIBufferInit(int maxBackends)
{
segP->procState[i].nextMsgNum = -1; /* inactive */
segP->procState[i].resetState = false;
segP->procState[i].procStruct = INVALID_OFFSET;
}
}
@@ -133,7 +134,6 @@ SIBackendInit(SISeg *segP)
/* mark myself active, with all extant messages already read */
stateP->nextMsgNum = segP->maxMsgNum;
stateP->resetState = false;
stateP->procStruct = MAKE_OFFSET(MyProc);
/* register exit routine to mark my entry inactive at exit */
on_shmem_exit(CleanupInvalidationState, PointerGetDatum(segP));
@@ -163,7 +163,6 @@ CleanupInvalidationState(int status, Datum arg)
/* Mark myself inactive */
segP->procState[MyBackendId - 1].nextMsgNum = -1;
segP->procState[MyBackendId - 1].resetState = false;
segP->procState[MyBackendId - 1].procStruct = INVALID_OFFSET;
/* Recompute index of last active backend */
for (i = segP->lastBackend; i > 0; i--)