llvm-project

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// RUN: %clangxx_tsan -O1 %s -o %t && %deflake %run %t | FileCheck %s
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#include "test.h"
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int X = 0;
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__attribute__((noinline)) void MySleep() {
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  sleep(1);  // the sleep that must appear in the report
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}
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void *Thread(void *p) {
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  barrier_wait(&barrier);
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  MySleep();  // Assume the main thread has done the write.
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  X = 42;
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  return 0;
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}
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int main() {
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  barrier_init(&barrier, 2);
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  pthread_t t;
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  pthread_create(&t, 0, Thread, 0);
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  X = 43;
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  barrier_wait(&barrier);
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  pthread_join(t, 0);
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  return 0;
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}
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// CHECK: WARNING: ThreadSanitizer: data race
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// ...
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// CHECK:   As if synchronized via sleep:
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// CHECK-NEXT:     #0 sleep
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// CHECK-NEXT:     #1 MySleep
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// CHECK-NEXT:     #2 Thread
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