fixes bug 192294 "hangs at various URLs (Windows 9x-specific)" r=wtc sr=bz a=asa

netwerk/base/src/nsSocketTransportService2.cpp

@@ -260,10 +260,6 @@ nsSocketTransportService::ServiceEventQ()
     {
         nsAutoLock lock(mEventQLock);
 
-        // wait should not block
-        if (mThreadEvent)
-            PR_WaitForPollableEvent(mThreadEvent);
-
         head = mEventQ.mHead;
         mEventQ.mHead = nsnull;
         mEventQ.mTail = nsnull;
@@ -593,8 +589,11 @@ nsSocketTransportService::Run()
             //
             // service the event queue (mPollList[0].fd == mThreadEvent)
             //
-            if (mPollList[0].out_flags == PR_POLL_READ)
+            if (mPollList[0].out_flags == PR_POLL_READ) {
+                // acknowledge pollable event (wait should not block)
+                PR_WaitForPollableEvent(mThreadEvent);
                 active = ServiceEventQ();
+            }
         }
         else {
             //