llvm-project

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// RUN: %clang_tsan -O1 %s -o %t && %run %t 2>&1 | FileCheck %s
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#include "test.h"
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#include <signal.h>
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#include <unistd.h>
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#include <errno.h>
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#include <semaphore.h>
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// Test that signals can be delivered to blocked pthread_cond_wait.
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// https://github.com/google/sanitizers/issues/498
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int g_thread_run = 1;
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pthread_mutex_t mutex;
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pthread_cond_t cond;
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void sig_handler(int sig) {
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  (void)sig;
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  write(2, "SIGNAL\n", sizeof("SIGNAL\n") - 1);
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  barrier_wait(&barrier);
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}
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void* my_thread(void* arg) {
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  pthread_mutex_lock(&mutex);
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  while (g_thread_run)
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    pthread_cond_wait(&cond, &mutex);
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  pthread_mutex_unlock(&mutex);
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  return 0;
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}
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int main() {
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  barrier_init(&barrier, 2);
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  pthread_mutex_init(&mutex, 0);
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  pthread_cond_init(&cond, 0);
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  signal(SIGUSR1, &sig_handler);
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  pthread_t thr;
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  pthread_create(&thr, 0, &my_thread, 0);
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  // wait for thread to get inside pthread_cond_wait
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  // (can't use barrier_wait for that)
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  sleep(1);
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  pthread_kill(thr, SIGUSR1);
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  barrier_wait(&barrier);
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  pthread_mutex_lock(&mutex);
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  g_thread_run = 0;
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  pthread_cond_signal(&cond);
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  pthread_mutex_unlock(&mutex);
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  pthread_join(thr, 0);
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  fprintf(stderr, "DONE\n");
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  return 0;
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}
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// CHECK: SIGNAL
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// CHECK: DONE
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