compiler-rt/test/tsan/tsan-vs-gvn.cpp

   1 // RUN: %clangxx_tsan -O1 %s -o %t && %run %t 2>&1 | FileCheck %s
   2 // RUN: %clangxx_tsan -O2 %s -o %t && %run %t 2>&1 | FileCheck %s
   3 // RUN: %clangxx_tsan -O3 %s -o %t && %run %t 2>&1 | FileCheck %s
   4 //
   5 // Check that load widening is not tsan-hostile.
   6 #include <pthread.h>
   7 #include <stdio.h>
   8 #include <string.h>
   9
  10 struct {
  11   int i;
  12   char c1, c2, c3, c4;
  13 } S;
  14
  15 int G;
  16
  17 void *Thread1(void *x) {
  18   G = S.c1 + S.c3;
  19   return NULL;
  20 }
  21
  22 void *Thread2(void *x) {
  23   S.c2 = 1;
  24   return NULL;
  25 }
  26
  27 int main() {
  28   pthread_t t[2];
  29   memset(&S, 123, sizeof(S));
  30   pthread_create(&t[0], NULL, Thread1, NULL);
  31   pthread_create(&t[1], NULL, Thread2, NULL);
  32   pthread_join(t[0], NULL);
  33   pthread_join(t[1], NULL);
  34   fprintf(stderr, "PASS\n");
  35 }
  36
  37 // CHECK-NOT: WARNING: ThreadSanitizer: data race
  38 // CHECK: PASS