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

source code of compiler-rt/test/tsan/inlined_memcpy_race.cpp