1*bcaeed49SFangrui Song // RUN: %clangxx_tsan -O1 %s %link_libcxx_tsan -o %t && %run %t 2>&1 | FileCheck %s
2*bcaeed49SFangrui Song #include <stdio.h>
3*bcaeed49SFangrui Song #include <memory>
4*bcaeed49SFangrui Song #include <thread>
5*bcaeed49SFangrui Song 
main()6*bcaeed49SFangrui Song int main() {
7*bcaeed49SFangrui Song   int v1 = 0;
8*bcaeed49SFangrui Song   int v2 = 0;
9*bcaeed49SFangrui Song   std::thread t1;
10*bcaeed49SFangrui Song   std::thread t2;
11*bcaeed49SFangrui Song 
12*bcaeed49SFangrui Song   {
13*bcaeed49SFangrui Song      auto thingy = std::make_shared<int>(42);
14*bcaeed49SFangrui Song      t1 = std::thread([thingy, &v1] { v1 = *thingy; });
15*bcaeed49SFangrui Song      t2 = std::thread([thingy, &v2] { v2 = *thingy; });
16*bcaeed49SFangrui Song   }
17*bcaeed49SFangrui Song 
18*bcaeed49SFangrui Song   t1.join();
19*bcaeed49SFangrui Song   t2.join();
20*bcaeed49SFangrui Song   printf("%d %d\n", v1, v2);
21*bcaeed49SFangrui Song   // CHECK-NOT: ThreadSanitizer: data race
22*bcaeed49SFangrui Song   // CHECK: 42 42
23*bcaeed49SFangrui Song   return 0;
24*bcaeed49SFangrui Song }
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