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Per previous discussions, here are two functions to send INT and TERM

Browse Source 
(cancel and terminate) signals to other backends.   They permit only INT
and TERM, and permits sending only to postgresql backends.

Magnus Hagander
This commit is contained in:
Bruce Momjian
2004-06-02 21:29:29 +00:00
parent de2c66539e
commit e8d9d68ca4
6 changed files with 95 additions and 7 deletions
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36
src/backend/storage/ipc/sinval.c
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@@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/storage/ipc/sinval.c,v 1.63 2004/05/23 03:50:45 tgl Exp $
* $PostgreSQL: pgsql/src/backend/storage/ipc/sinval.c,v 1.64 2004/06/02 21:29:28 momjian Exp $
*
*-------------------------------------------------------------------------
*/
@@ -463,6 +463,40 @@ TransactionIdIsInProgress(TransactionId xid)
return result;
}
/*
* IsBackendPid -- is a given pid a running backend
*/
bool
IsBackendPid(int pid)
{
bool result = false;
SISeg *segP = shmInvalBuffer;
ProcState *stateP = segP->procState;
int index;
LWLockAcquire(SInvalLock, LW_SHARED);
for (index = 0; index < segP->lastBackend; index++)
{
SHMEM_OFFSET pOffset = stateP[index].procStruct;
if (pOffset != INVALID_OFFSET)
{
PGPROC *proc = (PGPROC *) MAKE_PTR(pOffset);
if (proc->pid == pid)
{
result = true;
break;
}
}
}
LWLockRelease(SInvalLock);
return result;
}
/*
* GetOldestXmin -- returns oldest transaction that was running
* when any current transaction was started.