compiler-rt/test/tsan/flush_memory.cpp

   1 // RUN: %clangxx_tsan -O1 %s -o %t
   2 // RUN: %env_tsan_opts=flush_memory_ms=1:flush_symbolizer_ms=1:memory_limit_mb=1 not %run %t 2>&1 | FileCheck %s
   3 #include "test.h"
   4
   5 long X, Y;
   6
   7 void *Thread(void *arg) {
   8   __atomic_fetch_add(&X, 1, __ATOMIC_SEQ_CST);
   9   barrier_wait(&barrier);
  10   barrier_wait(&barrier);
  11   Y = 1;
  12   return &Y;
  13 }
  14
  15 int main() {
  16   __tsan_flush_memory();
  17   barrier_init(&barrier, 2);
  18   __atomic_fetch_add(&X, 1, __ATOMIC_SEQ_CST);
  19   pthread_t t;
  20   pthread_create(&t, NULL, Thread, NULL);
  21   barrier_wait(&barrier);
  22   __tsan_flush_memory();
  23   // Trigger a race to test flushing of the symbolizer cache.
  24   Y = 2;
  25   barrier_wait(&barrier);
  26   pthread_join(t, NULL);
  27   __atomic_fetch_add(&X, 1, __ATOMIC_SEQ_CST);
  28   // Background runtime thread should do some flushes meanwhile.
  29   sleep(2);
  30   __tsan_flush_memory();
  31   fprintf(stderr, "DONE\n");
  32   // The race may not be detected since we are doing aggressive flushes
  33   // (if the state flush happens between racing accesses, tsan won't
  34   // detect the race). So return 1 to make the test deterministic.
  35   return 1;
  36 }
  37
  38 // CHECK: DONE