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PG_FINALLY

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This gives an alternative way of catching exceptions, for the common
case where the cleanup code is the same in the error and non-error
cases.  So instead of

    PG_TRY();
    {
        ... code that might throw ereport(ERROR) ...
    }
    PG_CATCH();
    {
        cleanup();
	PG_RE_THROW();
    }
    PG_END_TRY();
    cleanup();

one can write

    PG_TRY();
    {
        ... code that might throw ereport(ERROR) ...
    }
    PG_FINALLY();
    {
        cleanup();
    }
    PG_END_TRY();

Discussion: https://www.postgresql.org/message-id/flat/95a822c3-728b-af0e-d7e5-71890507ae0c%402ndquadrant.com
This commit is contained in:
Peter Eisentraut
2019-11-01 11:09:52 +01:00
parent 7302514088
commit 604bd36711
32 changed files with 91 additions and 245 deletions
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9
src/backend/commands/async.c
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@ -2028,22 +2028,15 @@ asyncQueueReadAllNotifications(void)
snapshot);
} while (!reachedStop);
}
PG_CATCH();
PG_FINALLY();
{
/* Update shared state */
LWLockAcquire(AsyncQueueLock, LW_SHARED);
QUEUE_BACKEND_POS(MyBackendId) = pos;
LWLockRelease(AsyncQueueLock);
PG_RE_THROW();
}
PG_END_TRY();
/* Update shared state */
LWLockAcquire(AsyncQueueLock, LW_SHARED);
QUEUE_BACKEND_POS(MyBackendId) = pos;
LWLockRelease(AsyncQueueLock);
/* Done with snapshot */
UnregisterSnapshot(snapshot);
}