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authorMike Frysinger <vapier@gentoo.org>2007-02-20 16:21:29 +0000
committerMike Frysinger <vapier@gentoo.org>2007-02-20 16:21:29 +0000
commitcf61af7af9705f2ed53e557a951b2e09f71d0ae1 (patch)
tree8943f3b4bfde38f322ea74c905a36136013587e1 /test/pthread/tst-too-many-cleanups.c
parent8d8b6ba629c8f510b152ec4bac03a7d7ac25ab2f (diff)
make sure cleanup handler is only called once
Diffstat (limited to 'test/pthread/tst-too-many-cleanups.c')
-rw-r--r--test/pthread/tst-too-many-cleanups.c97
1 files changed, 97 insertions, 0 deletions
diff --git a/test/pthread/tst-too-many-cleanups.c b/test/pthread/tst-too-many-cleanups.c
new file mode 100644
index 000000000..54907fc23
--- /dev/null
+++ b/test/pthread/tst-too-many-cleanups.c
@@ -0,0 +1,97 @@
+/*
+ * This illustrates the bug where the cleanup function
+ * of a thread may be called too many times.
+ *
+ * main thread:
+ * - grab mutex
+ * - spawn thread1
+ * - go to sleep
+ * thread1:
+ * - register cleanup handler via pthread_cleanup_push()
+ * - try to grab mutex and sleep
+ * main:
+ * - kill thread1
+ * - go to sleep
+ * thread1 cleanup handler:
+ * - try to grab mutex and sleep
+ * main:
+ * - kill thread1
+ * - go to sleep
+ * thread1 cleanup handler:
+ * - wrongly called again
+ */
+
+#ifndef _GNU_SOURCE
+#define _GNU_SOURCE
+#endif
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <pthread.h>
+#include <assert.h>
+#include <unistd.h>
+
+#define warn(fmt, args...) fprintf(stderr, "[%p] " fmt, (void*)pthread_self(), ## args)
+#define warnf(fmt, args...) warn("%s:%i: " fmt, __FUNCTION__, __LINE__, ## args)
+
+int ok_to_kill_thread;
+
+static void thread_killed(void *arg);
+
+static void *KillMeThread(void *thread_par)
+{
+ pthread_t pthread_id;
+
+ warnf("Starting child thread\n");
+
+ pthread_id = pthread_self();
+ pthread_cleanup_push(thread_killed, (void *)pthread_id);
+
+ pthread_setcanceltype(PTHREAD_CANCEL_ASYNCHRONOUS, NULL);
+ pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, NULL);
+
+ /* main code */
+ warnf("please kill me now\n");
+ while (1)
+ ok_to_kill_thread = 1;
+
+ pthread_cleanup_pop(0);
+}
+
+static void thread_killed(void *arg)
+{
+ static num_times_called = 0;
+
+ warnf("killing %p [cnt=%i]\n", arg, ++num_times_called);
+ assert(num_times_called == 1);
+
+ /* pick any cancellation endpoint, sleep() will do just fine */
+ while (1) {
+ warnf("sleeping in cancellation endpoint ...\n");
+ sleep(1);
+ }
+
+ warnf("done cleaning up\n");
+}
+
+int main(int argc, char *argv[])
+{
+ int count = 3;
+ pthread_t app_pthread_id;
+
+ ok_to_kill_thread = 0;
+
+ pthread_create(&app_pthread_id, NULL, KillMeThread, NULL);
+
+ warnf("waiting for thread to prepare itself\n");
+ while (!ok_to_kill_thread)
+ ;
+
+ while (count--) {
+ warnf("killing thread\n");
+ pthread_cancel(app_pthread_id);
+ sleep(3);
+ }
+
+ return 0;
+}