compiler-rt/test/tsan/getline_nohang.cpp

   1 // RUN: %clangxx_tsan -O1 %s -o %t && %run %t
   2
   3 // Data race randomly triggered.
   4 // UNSUPPORTED: target={{.*netbsd.*}}
   5
   6 // Make sure TSan doesn't deadlock on a file stream lock at program shutdown.
   7 // See https://github.com/google/sanitizers/issues/454
   8 #ifdef __FreeBSD__
   9 #define _WITH_GETLINE  // to declare getline()
  10 #endif
  11
  12 #include <pthread.h>
  13 #include <stdio.h>
  14 #include <unistd.h>
  15
  16 void *thread(void *unused) {
  17   char *line = NULL;
  18   size_t size;
  19   int fd[2];
  20   pipe(fd);
  21   // Forge a non-standard stream to make sure it's not closed.
  22   FILE *stream = fdopen(fd[0], "r");
  23   while (1) {
  24     volatile int res = getline(&line, &size, stream);
  25     (void)res;
  26   }
  27   return NULL;
  28 }
  29
  30 int main() {
  31   pthread_t t;
  32   pthread_attr_t a;
  33   pthread_attr_init(&a);
  34   pthread_attr_setdetachstate(&a, PTHREAD_CREATE_DETACHED);
  35   pthread_create(&t, &a, thread, NULL);
  36   pthread_attr_destroy(&a);
  37   fprintf(stderr, "DONE\n");
  38   return 0;
  39   // ThreadSanitizer used to hang here because of a deadlock on a file stream.
  40 }
  41
  42 // CHECK: DONE