1 // RUN: %clangxx_tsan -O1 %s -o %t && %deflake %run %t 2>&1 | FileCheck %s
2 #include "test.h"
3 #include <stdint.h>
4 #include <errno.h>
5 #include <sys/mman.h>
6 
7 // Test for issue:
8 // https://github.com/google/sanitizers/issues/412
9 
10 // MAP_32BIT flag for mmap is supported only for x86_64.
11 // XFAIL: mips
12 // XFAIL: aarch64
13 // XFAIL: powerpc64
14 // XFAIL: s390x
15 
16 // MAP_32BIT doesn't exist on OS X and NetBSD.
17 // UNSUPPORTED: darwin,netbsd
18 
19 void *Thread(void *ptr) {
20   *(int*)ptr = 42;
21   barrier_wait(&barrier);
22   return 0;
23 }
24 
25 int main() {
26   barrier_init(&barrier, 2);
27   void *ptr = mmap(0, 128 << 10, PROT_READ|PROT_WRITE,
28       MAP_32BIT|MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
29   fprintf(stderr, "ptr=%p\n", ptr);
30   if (ptr == MAP_FAILED) {
31     fprintf(stderr, "mmap failed: %d\n", errno);
32     return 1;
33   }
34   if ((uintptr_t)ptr >= (1ull << 32)) {
35     fprintf(stderr, "ptr is too high\n");
36     return 1;
37   }
38   pthread_t t;
39   pthread_create(&t, 0, Thread, ptr);
40   barrier_wait(&barrier);
41   *(int*)ptr = 42;
42   pthread_join(t, 0);
43   munmap(ptr, 128 << 10);
44   fprintf(stderr, "DONE\n");
45 }
46 
47 // CHECK: WARNING: ThreadSanitizer: data race
48 // CHECK: DONE
49