compiler-rt/test/tsan/fd_close_norace3.cpp

   1 // RUN: %clangxx_tsan -O1 %s -o %t && %env_tsan_opts=flush_memory_ms=1 %run %t 2>&1 | FileCheck %s
   2 #include "test.h"
   3 #include <fcntl.h>
   4 #include <sys/stat.h>
   5 #include <sys/types.h>
   6 #include <unistd.h>
   7
   8 void *Thread(void *stop) {
   9   while (!__atomic_load_n((int *)stop, __ATOMIC_RELAXED))
  10     close(open("/dev/null", O_RDONLY));
  11   return 0;
  12 }
  13
  14 int main() {
  15   int stop = 0;
  16   const int kThreads = 10;
  17   pthread_t th[kThreads];
  18   for (int i = 0; i < kThreads; i++)
  19     pthread_create(&th[i], 0, Thread, &stop);
  20   sleep(5);
  21   __atomic_store_n(&stop, 1, __ATOMIC_RELAXED);
  22   for (int i = 0; i < kThreads; i++)
  23     pthread_join(th[i], 0);
  24   fprintf(stderr, "DONE\n");
  25 }
  26
  27 // CHECK-NOT: WARNING: ThreadSanitizer: data race
  28 // CHECK: DONE