compiler-rt/test/tsan/race_on_speculative_load.cpp

   1 // RUN: %clangxx_tsan -O1 %s -o %t && %run %t 2>&1 | FileCheck %s
   2 // Regtest for https://github.com/google/sanitizers/issues/447
   3 // This is a correct program and tsan should not report a race.
   4 #include "test.h"
   5
   6 int g;
   7 __attribute__((noinline))
   8 int foo(int cond) {
   9   if (cond)
  10     return g;
  11   return 0;
  12 }
  13
  14 void *Thread1(void *p) {
  15   barrier_wait(&barrier);
  16   long res = foo((long)p);
  17   return (void*) res;
  18 }
  19
  20 int main() {
  21   barrier_init(&barrier, 2);
  22   pthread_t t;
  23   pthread_create(&t, 0, Thread1, 0);
  24   g = 1;
  25   barrier_wait(&barrier);
  26   pthread_join(t, 0);
  27   fprintf(stderr, "PASS\n");
  28   // CHECK-NOT: ThreadSanitizer: data race
  29   // CHECK: PASS
  30 }