File: inlined_memcpy_race.cpp

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llvm-toolchain-19 1%3A19.1.7-3
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// RUN: %clangxx_tsan -O1 %s -o %t && %deflake %run %t 2>&1 | FileCheck %s
#include "test.h"
#include <string.h>

int x[4], z[4];

void *MemCpyThread(void *a) {
  memcpy((int*)a, z, 16);
  barrier_wait(&barrier);
  return NULL;
}

void *MemSetThread(void *a) {
  barrier_wait(&barrier);
  memset((int*)a, 0, 16);
  return NULL;
}

int main() {
  barrier_init(&barrier, 2);
  pthread_t t[2];
  // Race on x between memcpy and memset
  pthread_create(&t[0], NULL, MemCpyThread, x);
  pthread_create(&t[1], NULL, MemSetThread, x);
  pthread_join(t[0], NULL);
  pthread_join(t[1], NULL);
  fprintf(stderr, "PASS\n");
  return 0;
}

// CHECK: WARNING: ThreadSanitizer: data race
// CHECK:   #0 {{.*}}memset
// CHECK:   #{{[12]}} MemSetThread
// CHECK:  Previous write
// CHECK:   #0 {{.*mem(cpy|move)}}
// CHECK:   #{{[12]}} MemCpyThread