test/tsan/ignore_malloc.cc

   1 // RUN: %clang_tsan -O1 %s -o %t && %run %t 2>&1 | FileCheck %s
   2 #include <pthread.h>
   3 #include <stdlib.h>
   4 #include <stdio.h>
   5 #include <unistd.h>
   6
   7 extern "C" {
   8 void AnnotateIgnoreReadsBegin(const char *f, int l);
   9 void AnnotateIgnoreReadsEnd(const char *f, int l);
  10 void AnnotateIgnoreWritesBegin(const char *f, int l);
  11 void AnnotateIgnoreWritesEnd(const char *f, int l);
  12 }
  13
  14 int *g;
  15
  16 void *Thread(void *a) {
  17   int *p = 0;
  18   while ((p = __atomic_load_n(&g, __ATOMIC_RELAXED)) == 0)
  19     usleep(100);
  20   *p = 42;
  21   return 0;
  22 }
  23
  24 int main() {
  25   pthread_t t;
  26   pthread_create(&t, 0, Thread, 0);
  27   AnnotateIgnoreWritesBegin(__FILE__, __LINE__);
  28   int *p = new int(0);
  29   AnnotateIgnoreWritesEnd(__FILE__, __LINE__);
  30   __atomic_store_n(&g, p, __ATOMIC_RELAXED);
  31   pthread_join(t, 0);
  32   delete p;
  33   fprintf(stderr, "OK\n");
  34   return 0;
  35 }
  36
  37 // CHECK-NOT: WARNING: ThreadSanitizer: data race
  38 // CHECK: OK