compiler-rt/test/tsan/ignore_malloc.cpp

   1 // RUN: %clangxx_tsan -O1 %s -o %t && %run %t 2>&1 | FileCheck %s
   2 #include "test.h"
   3
   4 int *g;
   5
   6 void *Thread(void *a) {
   7   int *p = 0;
   8   while ((p = __atomic_load_n(&g, __ATOMIC_RELAXED)) == 0)
   9     usleep(100);  // spin-wait
  10   *p = 42;
  11   return 0;
  12 }
  13
  14 int main() {
  15   pthread_t t;
  16   pthread_create(&t, 0, Thread, 0);
  17   AnnotateIgnoreWritesBegin(__FILE__, __LINE__);
  18   int *p = new int(0);
  19   AnnotateIgnoreWritesEnd(__FILE__, __LINE__);
  20   __atomic_store_n(&g, p, __ATOMIC_RELAXED);
  21   pthread_join(t, 0);
  22   delete p;
  23   fprintf(stderr, "OK\n");
  24   return 0;
  25 }
  26
  27 // CHECK-NOT: WARNING: ThreadSanitizer: data race
  28 // CHECK: OK