diff options
Diffstat (limited to 'src/backend/storage/ipc/sinval.c')
| -rw-r--r-- | src/backend/storage/ipc/sinval.c | 36 |
1 files changed, 35 insertions, 1 deletions
diff --git a/src/backend/storage/ipc/sinval.c b/src/backend/storage/ipc/sinval.c index 570feab25e6..856d0f0a73f 100644 --- a/src/backend/storage/ipc/sinval.c +++ b/src/backend/storage/ipc/sinval.c @@ -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 $ * *------------------------------------------------------------------------- */ @@ -464,6 +464,40 @@ TransactionIdIsInProgress(TransactionId xid) } /* + * 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. * |