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