1 // RUN: %clangxx_tsan -O1 %s -o %t && %run %t 2>&1 | FileCheck %s
2 #include "java.h"
3
4 jptr varaddr;
5 jptr lockaddr;
6
Thread(void * p)7 void *Thread(void *p) {
8 while (__atomic_load_n((int*)lockaddr, __ATOMIC_RELAXED) == 0)
9 usleep(1000); // spin-wait
10 __tsan_java_acquire(lockaddr);
11 *(int*)varaddr = 42;
12 return 0;
13 }
14
main()15 int main() {
16 barrier_init(&barrier, 2);
17 int const kHeapSize = 1024 * 1024;
18 jptr jheap = (jptr)malloc(kHeapSize + 8) + 8;
19 __tsan_java_init(jheap, kHeapSize);
20 const int kBlockSize = 16;
21 __tsan_java_alloc(jheap, kBlockSize);
22 varaddr = jheap;
23 lockaddr = jheap + 8;
24 pthread_t th;
25 pthread_create(&th, 0, Thread, 0);
26 *(int*)varaddr = 43;
27 __tsan_java_release(lockaddr);
28 __atomic_store_n((int*)lockaddr, 1, __ATOMIC_RELAXED);
29 pthread_join(th, 0);
30 *(int*)lockaddr = 0;
31 pthread_create(&th, 0, Thread, 0);
32 *(int*)varaddr = 43;
33 __tsan_java_release_store(lockaddr);
34 __atomic_store_n((int*)lockaddr, 1, __ATOMIC_RELAXED);
35 pthread_join(th, 0);
36 __tsan_java_free(jheap, kBlockSize);
37 fprintf(stderr, "DONE\n");
38 return __tsan_java_fini();
39 }
40
41 // CHECK-NOT: WARNING: ThreadSanitizer: data race
42 // CHECK: DONE
43