llvm-project

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// RUN: %clangxx_tsan -O1 %s -o %t && %run %t 2>&1 | FileCheck %s
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#include "java.h"
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jptr varaddr;
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jptr lockaddr;
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void *Thread(void *p) {
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  while (__atomic_load_n((int*)lockaddr, __ATOMIC_RELAXED) == 0)
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    usleep(1000);  // spin-wait
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  __tsan_java_acquire(lockaddr);
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  *(int*)varaddr = 42;
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  return 0;
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}
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int main() {
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  barrier_init(&barrier, 2);
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  int const kHeapSize = 1024 * 1024;
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  jptr jheap = (jptr)malloc(kHeapSize + 8) + 8;
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  __tsan_java_init(jheap, kHeapSize);
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  const int kBlockSize = 16;
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  __tsan_java_alloc(jheap, kBlockSize);
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  varaddr = jheap;
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  lockaddr = jheap + 8;
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  pthread_t th;
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  pthread_create(&th, 0, Thread, 0);
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  *(int*)varaddr = 43;
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  __tsan_java_release(lockaddr);
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  __atomic_store_n((int*)lockaddr, 1, __ATOMIC_RELAXED);
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  pthread_join(th, 0);
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  *(int*)lockaddr = 0;
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  pthread_create(&th, 0, Thread, 0);
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  *(int*)varaddr = 43;
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  __tsan_java_release_store(lockaddr);
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  __atomic_store_n((int*)lockaddr, 1, __ATOMIC_RELAXED);
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  pthread_join(th, 0);
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  __tsan_java_free(jheap, kBlockSize);
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  fprintf(stderr, "DONE\n");
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  return __tsan_java_fini();
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}
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// CHECK-NOT: WARNING: ThreadSanitizer: data race
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// CHECK: DONE
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