compiler-rt/test/tsan/thread_detach2.c

   1 // RUN: %clang_tsan -O1 %s -o %t && %run %t 2>&1 | FileCheck %s
   2 #include "test.h"
   3
   4 // Test for https://llvm.org/bugs/show_bug.cgi?id=23235
   5 // The bug was that synchronization between thread creation and thread start
   6 // is not established if pthread_create is followed by pthread_detach.
   7
   8 int x;
   9
  10 void *Thread(void *a) {
  11   x = 42;
  12   barrier_wait(&barrier);
  13   return 0;
  14 }
  15
  16 int main() {
  17   barrier_init(&barrier, 2);
  18   pthread_t t;
  19   x = 43;
  20   pthread_create(&t, 0, Thread, 0);
  21   pthread_detach(t);
  22   barrier_wait(&barrier);
  23   fprintf(stderr, "PASS\n");
  24   return 0;
  25 }
  26
  27 // CHECK-NOT: WARNING: ThreadSanitizer: data race
  28 // CHECK: PASS