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
11int g_thread_run = 1;
12pthread_mutex_t mutex;
13pthread_cond_t cond;
14
15void sig_handler(int sig) {
16  (void)sig;
17  write(1, "SIGNAL\n", sizeof("SIGNAL\n") - 1);
18  barrier_wait(&barrier);
19}
20
21void* 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
29int 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