xref: /llvm-project/compiler-rt/test/tsan/memcpy_race.cpp (revision b4257d3bf58c51ff437c99c7b160023f5fffac78)

// RUN: %clangxx_tsan -O1 %s -o %t && %deflake %run %t | FileCheck %s
#include "test.h"
#include <string.h>

char *data = new char[10];
char *data1 = new char[10];
char *data2 = new char[10];

void *Thread1(void *x) {
  static volatile int size = 1;
  memcpy(data+5, data1, size);
  barrier_wait(&barrier);
  return NULL;
}

void *Thread2(void *x) {
  static volatile int size = 4;
  barrier_wait(&barrier);
  memcpy(data+3, data2, size);
  return NULL;
}

int main() {
  barrier_init(&barrier, 2);
  print_address("addr1=", 1, &data[3]);
  print_address("addr2=", 1, &data[5]);
  pthread_t t[2];
  pthread_create(&t[0], NULL, Thread1, NULL);
  pthread_create(&t[1], NULL, Thread2, NULL);
  pthread_join(t[0], NULL);
  pthread_join(t[1], NULL);
  return 0;
}

// CHECK: addr1=[[ADDR1:0x[0-9,a-f]+]]
// CHECK: addr2=[[ADDR2:0x[0-9,a-f]+]]
// CHECK: WARNING: ThreadSanitizer: data race
// CHECK:   Write of size 4 at [[ADDR1]] by thread T2:
// CHECK:     #0 {{.*mem(cpy|move)}}
// CHECK:     #{{[12]}} Thread2
// CHECK:   Previous write of size 1 at [[ADDR2]] by thread T1:
// CHECK:     #0 {{.*mem(cpy|move)}}
// CHECK:     #{{[12]}} Thread1