src/compiler-rt/test/tsan/memcmp_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 *data0 = 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   static volatile int sink;
  12   sink = memcmp(data0+5, data1, size);
  13   barrier_wait(&barrier);
  14   return NULL;
  15 }
  16
  17 void *Thread2(void *x) {
  18   static volatile int size = 4;
  19   barrier_wait(&barrier);
  20   memcpy(data0+5, data2, size);
  21   return NULL;
  22 }
  23
  24 int main() {
  25   barrier_init(&barrier, 2);
  26   fprintf(stderr, "addr=%p\n", &data0[5]);
  27   pthread_t t[2];
  28   pthread_create(&t[0], NULL, Thread1, NULL);
  29   pthread_create(&t[1], NULL, Thread2, NULL);
  30   pthread_join(t[0], NULL);
  31   pthread_join(t[1], NULL);
  32   return 0;
  33 }
  34
  35 // CHECK: addr=[[ADDR:0x[0-9,a-f]+]]
  36 // CHECK: WARNING: ThreadSanitizer: data race
  37 // CHECK:   Write of size 1 at [[ADDR]] by thread T2:
  38 // CHECK:     #0 memcpy
  39 // CHECK:     #1 Thread2
  40 // CHECK:   Previous read of size 1 at [[ADDR]] by thread T1:
  41 // CHECK:     #0 memcmp
  42 // CHECK:     #1 Thread1