compiler-rt/test/tsan/static_init3.cpp

   1 // RUN: %clangxx_tsan -O1 %s -o %t && %deflake %run %t | FileCheck %s
   2 #include <pthread.h>
   3 #include <stdlib.h>
   4 #include <stdio.h>
   5 #include <sched.h>
   6
   7 struct Cache {
   8   int x;
   9 };
  10
  11 Cache g_cache;
  12
  13 Cache *CreateCache() {
  14   g_cache.x = rand();
  15   return &g_cache;
  16 }
  17
  18 _Atomic(Cache*) queue;
  19
  20 void *Thread1(void *x) {
  21   static Cache *c = CreateCache();
  22   __c11_atomic_store(&queue, c, 0);
  23   return 0;
  24 }
  25
  26 void *Thread2(void *x) {
  27   Cache *c = 0;
  28   for (;;) {
  29     c = __c11_atomic_load(&queue, 0);
  30     if (c)
  31       break;
  32     sched_yield();
  33   }
  34   if (c->x >= RAND_MAX)
  35     exit(1);
  36   return 0;
  37 }
  38
  39 int main() {
  40   pthread_t t[2];
  41   pthread_create(&t[0], 0, Thread1, 0);
  42   pthread_create(&t[1], 0, Thread2, 0);
  43   pthread_join(t[0], 0);
  44   pthread_join(t[1], 0);
  45 }
  46
  47 // CHECK: WARNING: ThreadSanitizer: data race