test/tsan/getline_nohang.cc

   1 // RUN: %clangxx_tsan -O1 %s -o %t && %run %t
   2
   3 // Make sure TSan doesn't deadlock on a file stream lock at program shutdown.
   4 // See https://code.google.com/p/thread-sanitizer/issues/detail?id=47
   5 #include <pthread.h>
   6 #include <stdio.h>
   7 #include <unistd.h>
   8
   9 void *thread(void *unused) {
  10   char *line = NULL;
  11   size_t size;
  12   int fd[2];
  13   pipe(fd);
  14   // Forge a non-standard stream to make sure it's not closed.
  15   FILE *stream = fdopen(fd[0], "r");
  16   while (1) {
  17     volatile int res = getline(&line, &size, stream);
  18     (void)res;
  19   }
  20   return NULL;
  21 }
  22
  23 int main() {
  24   pthread_t t;
  25   pthread_attr_t a;
  26   pthread_attr_init(&a);
  27   pthread_attr_setdetachstate(&a, PTHREAD_CREATE_DETACHED);
  28   pthread_create(&t, &a, thread, NULL);
  29   pthread_attr_destroy(&a);
  30   fprintf(stderr, "DONE\n");
  31   return 0;
  32   // ThreadSanitizer used to hang here because of a deadlock on a file stream.
  33 }
  34
  35 // CHECK: DONE