1// RUN: %clangxx_tsan -c -O1 -fno-sanitize=thread %s -o %t.o
2// RUN: %clangxx_tsan -O1 %s %t.o -o %t && %run %t 2>&1 | FileCheck %s
3
4#include <stdio.h>
5#include <stdlib.h>
6
7#if !__has_feature(thread_sanitizer)
8
9// Defined by tsan.
10extern "C" void *__interceptor_malloc(unsigned long size);
11extern "C" void __interceptor_free(void *p);
12extern "C" void *malloc(unsigned long size) {
13 static int first = 0;
14 if (__sync_lock_test_and_set(&first, 1) == 0)
15 fprintf(stderr, "user malloc\n");
16 return __interceptor_malloc(size);
17}
18
19extern "C" void free(void *p) {
20 __interceptor_free(p);
21}
22
23#else
24
25int main() {
26 volatile char *p = (char*)malloc(10);
27 p[0] = 0;
28 free((void*)p);
29}
30
31#endif
32
33// CHECK: user malloc
34// CHECK-NOT: ThreadSanitizer
35
36