1 // RUN: %clang_tsan -O1 %s -o %t && %run %t 2>&1 | FileCheck %s
2 #include "test.h"
3 #include <signal.h>
4 #include <unistd.h>
5 #include <errno.h>
6 #include <semaphore.h>
7
8 // Test that signals can be delivered to blocked pthread_cond_wait.
9 // https://github.com/google/sanitizers/issues/498
10
11 int g_thread_run = 1;
12 pthread_mutex_t mutex;
13 pthread_cond_t cond;
14
sig_handler(int sig)15 void sig_handler(int sig) {
16 (void)sig;
17 write(2, "SIGNAL\n", sizeof("SIGNAL\n") - 1);
18 barrier_wait(&barrier);
19 }
20
my_thread(void * arg)21 void* my_thread(void* arg) {
22 pthread_mutex_lock(&mutex);
23 while (g_thread_run)
24 pthread_cond_wait(&cond, &mutex);
25 pthread_mutex_unlock(&mutex);
26 return 0;
27 }
28
main()29 int main() {
30 barrier_init(&barrier, 2);
31
32 pthread_mutex_init(&mutex, 0);
33 pthread_cond_init(&cond, 0);
34
35 signal(SIGUSR1, &sig_handler);
36 pthread_t thr;
37 pthread_create(&thr, 0, &my_thread, 0);
38 // wait for thread to get inside pthread_cond_wait
39 // (can't use barrier_wait for that)
40 sleep(1);
41 pthread_kill(thr, SIGUSR1);
42 barrier_wait(&barrier);
43 pthread_mutex_lock(&mutex);
44 g_thread_run = 0;
45 pthread_cond_signal(&cond);
46 pthread_mutex_unlock(&mutex);
47 pthread_join(thr, 0);
48 fprintf(stderr, "DONE\n");
49 return 0;
50 }
51
52 // CHECK: SIGNAL
53 // CHECK: DONE
54