compiler-rt/test/tsan/atexit4.cpp

   1 // RUN: %clang_tsan -O1 %s -o %t && %deflake %run %t | FileCheck %s
   2 #include "test.h"
   3
   4 void *thread(void *x) {
   5   barrier_wait(&barrier);
   6   *static_cast<int *>(x) = 2;
   7   return nullptr;
   8 }
   9
  10 static void race() {
  11   int data = 0;
  12   pthread_t t;
  13   pthread_create(&t, nullptr, thread, &data);
  14   data = 1;
  15   barrier_wait(&barrier);
  16   pthread_join(t, nullptr);
  17 }
  18
  19 struct X {
  20   __attribute__((noinline))
  21   X() { atexit(race); }
  22 } x;
  23
  24 int main() {
  25   barrier_init(&barrier, 2);
  26   fprintf(stderr, "DONE\n");
  27 }
  28
  29 // CHECK: DONE
  30 // CHECK: WARNING: ThreadSanitizer: data race
  31 // CHECK:   Write of size 4
  32 // CHECK:     #0 thread
  33 // CHECK:   Previous write of size 4
  34 // CHECK:     #0 race
  35 // CHECK:     #1 at_exit_callback_installed_at
  36 // CHECK:     #2 X