Add BackendXidGetPid().
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@ -23,7 +23,7 @@
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*
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*
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* IDENTIFICATION
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* $PostgreSQL: pgsql/src/backend/storage/ipc/procarray.c,v 1.4 2005/07/31 17:19:18 tgl Exp $
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* $PostgreSQL: pgsql/src/backend/storage/ipc/procarray.c,v 1.5 2005/08/20 01:26:36 ishii Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -685,6 +685,44 @@ BackendPidGetProc(int pid)
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return result;
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}
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/*
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* BackendXidGetPid -- get a backend's pid given its XID
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*
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* Returns 0 if not found or it's a prepared transaction. Note that
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* it is up to the caller to be sure that the question remains
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* meaningful for long enough for the answer to be used ...
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*
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* Only main transaction Ids are considered. This function is mainly
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* useful for determining what backend owns a lock.
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*/
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int
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BackendXidGetPid(TransactionId xid)
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{
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int result = 0;
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ProcArrayStruct *arrayP = procArray;
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int index;
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if (xid == InvalidTransactionId) /* never match invalid xid */
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return 0;
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LWLockAcquire(ProcArrayLock, LW_SHARED);
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for (index = 0; index < arrayP->numProcs; index++)
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{
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PGPROC *proc = arrayP->procs[index];
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if (proc->xid == xid)
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{
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result = proc->pid;
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break;
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}
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}
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LWLockRelease(ProcArrayLock);
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return result;
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}
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/*
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* IsBackendPid -- is a given pid a running backend
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*/
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@ -7,7 +7,7 @@
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* Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* $PostgreSQL: pgsql/src/include/storage/procarray.h,v 1.3 2005/07/31 17:19:22 tgl Exp $
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* $PostgreSQL: pgsql/src/include/storage/procarray.h,v 1.4 2005/08/20 01:26:29 ishii Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -27,6 +27,7 @@ extern bool TransactionIdIsActive(TransactionId xid);
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extern TransactionId GetOldestXmin(bool allDbs);
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extern PGPROC *BackendPidGetProc(int pid);
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extern int BackendXidGetPid(TransactionId xid);
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extern bool IsBackendPid(int pid);
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extern bool DatabaseHasActiveBackends(Oid databaseId, bool ignoreMyself);
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