compiler-rt/test/tsan/java_volatile.cpp

   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
   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
  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