test/tsan/tls_race.cc

   1 // RUN: %clangxx_tsan -O1 %s -o %t && not %run %t 2>&1 | FileCheck %s
   2 #include <pthread.h>
   3 #include <stddef.h>
   4 #include <unistd.h>
   5
   6 void *Thread(void *a) {
   7   sleep(1);
   8   *(int*)a = 43;
   9   return 0;
  10 }
  11
  12 int main() {
  13   static __thread int Var = 42;
  14   pthread_t t;
  15   pthread_create(&t, 0, Thread, &Var);
  16   Var = 43;
  17   pthread_join(t, 0);
  18 }
  19
  20 // CHECK: WARNING: ThreadSanitizer: data race
  21 // CHECK:   Location is TLS of main thread.