src/compiler-rt/test/tsan/inlined_memcpy_race.cc

   1 // RUN: %clangxx_tsan -O1 %s -o %t && %deflake %run %t 2>&1 | FileCheck %s
   2 #include "test.h"
   3 #include <string.h>
   4
   5 int x[4], z[4];
   6
   7 void *MemCpyThread(void *a) {
   8   memcpy((int*)a, z, 16);
   9   barrier_wait(&barrier);
  10   return NULL;
  11 }
  12
  13 void *MemSetThread(void *a) {
  14   barrier_wait(&barrier);
  15   memset((int*)a, 0, 16);
  16   return NULL;
  17 }
  18
  19 int main() {
  20   barrier_init(&barrier, 2);
  21   pthread_t t[2];
  22   // Race on x between memcpy and memset
  23   pthread_create(&t[0], NULL, MemCpyThread, x);
  24   pthread_create(&t[1], NULL, MemSetThread, x);
  25   pthread_join(t[0], NULL);
  26   pthread_join(t[1], NULL);
  27   fprintf(stderr, "PASS\n");
  28   return 0;
  29 }
  30
  31 // CHECK: WARNING: ThreadSanitizer: data race
  32 // CHECK:   #0 memset
  33 // CHECK:   #1 MemSetThread
  34 // CHECK:  Previous write
  35 // CHECK:   #0 {{(memcpy|memmove)}}
  36 // CHECK:   #1 MemCpyThread
  37