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150
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1 // RUN: %clangxx_tsan -O1 %s -o %t && %run %t 2>&1 | FileCheck %s
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2 #include "java.h"
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3
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4 jptr varaddr;
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5 jptr lockaddr;
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6
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7 void *Thread(void *p) {
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8 while (__atomic_load_n((int*)lockaddr, __ATOMIC_RELAXED) == 0)
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9 usleep(1000); // spin-wait
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10 __tsan_java_acquire(lockaddr);
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11 *(int*)varaddr = 42;
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12 return 0;
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13 }
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14
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15 int main() {
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16 barrier_init(&barrier, 2);
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17 int const kHeapSize = 1024 * 1024;
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18 jptr jheap = (jptr)malloc(kHeapSize + 8) + 8;
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19 __tsan_java_init(jheap, kHeapSize);
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20 const int kBlockSize = 16;
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21 __tsan_java_alloc(jheap, kBlockSize);
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22 varaddr = jheap;
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23 lockaddr = jheap + 8;
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24 pthread_t th;
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25 pthread_create(&th, 0, Thread, 0);
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26 *(int*)varaddr = 43;
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27 __tsan_java_release(lockaddr);
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28 __atomic_store_n((int*)lockaddr, 1, __ATOMIC_RELAXED);
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29 pthread_join(th, 0);
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30 *(int*)lockaddr = 0;
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31 pthread_create(&th, 0, Thread, 0);
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32 *(int*)varaddr = 43;
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33 __tsan_java_release_store(lockaddr);
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34 __atomic_store_n((int*)lockaddr, 1, __ATOMIC_RELAXED);
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35 pthread_join(th, 0);
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36 __tsan_java_free(jheap, kBlockSize);
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37 fprintf(stderr, "DONE\n");
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38 return __tsan_java_fini();
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39 }
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40
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41 // CHECK-NOT: WARNING: ThreadSanitizer: data race
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42 // CHECK: DONE
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