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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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17
src/include/storage/sinval.h
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@@ -7,14 +7,13 @@
* Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/storage/sinval.h,v 1.40 2005/01/10 21:57:19 tgl Exp $
* $PostgreSQL: pgsql/src/include/storage/sinval.h,v 1.41 2005/05/19 21:35:47 tgl Exp $
*
*-------------------------------------------------------------------------
*/
#ifndef SINVAL_H
#define SINVAL_H
#include "storage/backendid.h"
#include "storage/itemptr.h"
#include "storage/relfilenode.h"
@@ -87,24 +86,12 @@ typedef union
extern int SInvalShmemSize(int maxBackends);
extern void CreateSharedInvalidationState(int maxBackends);
extern void InitBackendSharedInvalidationState(void);
extern void SendSharedInvalidMessage(SharedInvalidationMessage *msg);
extern void ReceiveSharedInvalidMessages(
void (*invalFunction) (SharedInvalidationMessage *msg),
void (*resetFunction) (void));
extern bool DatabaseHasActiveBackends(Oid databaseId, bool ignoreMyself);
extern bool TransactionIdIsInProgress(TransactionId xid);
extern bool IsBackendPid(int pid);
extern TransactionId GetOldestXmin(bool allDbs);
extern int CountActiveBackends(void);
extern int CountEmptyBackendSlots(void);
/* Use "struct PGPROC", not PGPROC, to avoid including proc.h here */
extern struct PGPROC *BackendIdGetProc(BackendId procId);
extern void XidCacheRemoveRunningXids(TransactionId xid,
int nxids, TransactionId *xids);
/* signal handler for catchup events (SIGUSR1) */
extern void CatchupInterruptHandler(SIGNAL_ARGS);