1// RUN: %clangxx_tsan -O1 %s -o %t && %deflake %run %t | FileCheck %s
2#include "test.h"
3#include <string.h>
4
5char *data0 = new char[10];
6char *data1 = new char[10];
7char *data2 = new char[10];
8
9void *Thread1(void *x) {
10 static volatile int size = 1;
11 static volatile int sink;
12 sink = memcmp(s1: data0+5, s2: data1, n: size);
13 barrier_wait(barrier: &barrier);
14 return NULL;
15}
16
17void *Thread2(void *x) {
18 static volatile int size = 4;
19 barrier_wait(barrier: &barrier);
20 memcpy(dest: data0+5, src: data2, n: size);
21 return NULL;
22}
23
24int main() {
25 barrier_init(barrier: &barrier, count: 2);
26 print_address("addr=", 1, &data0[5]);
27 pthread_t t[2];
28 pthread_create(newthread: &t[0], NULL, start_routine: Thread1, NULL);
29 pthread_create(newthread: &t[1], NULL, start_routine: Thread2, NULL);
30 pthread_join(th: t[0], NULL);
31 pthread_join(th: 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 3 at [[ADDR]] by thread T2:
38// CHECK: #0 {{.*mem(cpy|move)}}
39// CHECK: #{{[12]}} Thread2
40// CHECK: Previous read of size 1 at [[ADDR]] by thread T1:
41// CHECK: #0 {{.*}}memcmp
42// CHECK: #{{[12]}} Thread1
43

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