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From: John Baldwin <jhb@FreeBSD.org>
Subject: PERFORCE change 26513 for review
To: Perforce Change Reviews <perforce@freebsd.org>
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http://perforce.freebsd.org/chv.cgi?CH=26513

Change 26513 by jhb@jhb_laptop on 2003/03/07 14:18:18

	Fix a bug.

Affected files ...

.. //depot/projects/smpng/sys/modules/evtest/evtest.c#2 edit

Differences ...

==== //depot/projects/smpng/sys/modules/evtest/evtest.c#2 (text+ko) ====

@@ -183,12 +183,14 @@
 
 	printf("thread %d: dump:\n", evtest_lookupthread());
 	ee = (struct eventhandler_entry *)first_tag;
-	while (TAILQ_PREV(ee, eventhandler_entry_head, ee_link) != NULL)
-		ee = TAILQ_PREV(ee, eventhandler_entry_head, ee_link);
-	for (; ee != NULL; ee = TAILQ_NEXT(ee, ee_link)) {
-		ev = (struct eventhandler_entry_evtest *)ee;
-		printf("  pri %d, func %s()\n", ee->ee_priority,
-		    evtest_funcname(ev->eh_func));
+	if (ee != NULL) {
+		while (TAILQ_PREV(ee, eventhandler_entry_head, ee_link) != NULL)
+			ee = TAILQ_PREV(ee, eventhandler_entry_head, ee_link);
+		for (; ee != NULL; ee = TAILQ_NEXT(ee, ee_link)) {
+			ev = (struct eventhandler_entry_evtest *)ee;
+			printf("  pri %d, func %s()\n", ee->ee_priority,
+			    evtest_funcname(ev->eh_func));
+		}
 	}
 }
 
@@ -286,10 +288,12 @@
 	int i;
 
 	ee = (struct eventhandler_entry *)first_tag;
-	while (TAILQ_PREV(ee, eventhandler_entry_head, ee_link) != NULL)
-		ee = TAILQ_PREV(ee, eventhandler_entry_head, ee_link);
-	for (; ee != NULL; ee = TAILQ_NEXT(ee, ee_link))
-		EVENTHANDLER_DEREGISTER(evtest, ee);
+	if (ee != NULL) {
+		while (TAILQ_PREV(ee, eventhandler_entry_head, ee_link) != NULL)
+			ee = TAILQ_PREV(ee, eventhandler_entry_head, ee_link);
+		for (; ee != NULL; ee = TAILQ_NEXT(ee, ee_link))
+			EVENTHANDLER_DEREGISTER(evtest, ee);
+	}
 
 	mtx_lock(&event_mtx);
 	for (i = 0; i < NUM_THREADS; i++)

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