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*** src/backend/commands/async.c.orig   Sun Sep 15 21:24:41 2002
--- src/backend/commands/async.c    Mon Feb 17 21:38:47 2003
***************
*** 599,604 ****
--- 599,614 ----

    if (notifyInterruptEnabled)
    {
+       bool        save_ImmediateInterruptOK = ImmediateInterruptOK;
+
+       /*
+        * We may be called while ImmediateInterruptOK is true; turn it off
+        * while messing with the NOTIFY state.  (We would have to save
+        * and restore it anyway, because PGSemaphore operations inside
+        * ProcessIncomingNotify() might reset it.)
+        */
+       ImmediateInterruptOK = false;
+
        /*
         * I'm not sure whether some flavors of Unix might allow another
         * SIGUSR2 occurrence to recursively interrupt this routine. To
***************
*** 626,631 ****
--- 636,648 ----
                    elog(LOG, "Async_NotifyHandler: done");
            }
        }
+
+       /*
+        * Restore ImmediateInterruptOK, and check for interrupts if needed.
+        */
+       ImmediateInterruptOK = save_ImmediateInterruptOK;
+       if (save_ImmediateInterruptOK)
+           CHECK_FOR_INTERRUPTS();
    }
    else
    {