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

   1 // RUN: %clangxx_tsan -O1 %s -o %t && %deflake %run %t | FileCheck %s
   2 #include "test.h"
   3 #include <string.h>
   4
   5 char *data = new char[10];
   6 char *data1 = new char[10];
   7 char *data2 = new char[10];
   8
   9 void *Thread1(void *x) {
  10   static volatile int size = 1;
  11   memcpy(data+5, data1, size);
  12   barrier_wait(&barrier);
  13   return NULL;
  14 }
  15
  16 void *Thread2(void *x) {
  17   static volatile int size = 4;
  18   barrier_wait(&barrier);
  19   memcpy(data+3, data2, size);
  20   return NULL;
  21 }
  22
  23 int main() {
  24   barrier_init(&barrier, 2);
  25   fprintf(stderr, "addr=%p\n", &data[5]);
  26   pthread_t t[2];
  27   pthread_create(&t[0], NULL, Thread1, NULL);
  28   pthread_create(&t[1], NULL, Thread2, NULL);
  29   pthread_join(t[0], NULL);
  30   pthread_join(t[1], NULL);
  31   return 0;
  32 }
  33
  34 // CHECK: addr=[[ADDR:0x[0-9,a-f]+]]
  35 // CHECK: WARNING: ThreadSanitizer: data race
  36 // CHECK:   Write of size 1 at [[ADDR]] by thread T2:
  37 // CHECK:     #0 memcpy
  38 // CHECK:     #1 Thread2
  39 // CHECK:   Previous write of size 1 at [[ADDR]] by thread T1:
  40 // CHECK:     #0 memcpy
  41 // CHECK:     #1 Thread1