llvm-project

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// RUN: %clang_tsan -O1 %s -o %t && %env_tsan_opts=halt_on_error=1 %deflake %run %t | FileCheck %s
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#include "test.h"
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int X;
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void *Thread(void *x) {
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  barrier_wait(&barrier);
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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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  fprintf(stderr, "BEFORE\n");
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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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  fprintf(stderr, "AFTER\n");
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  return 0;
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}
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// CHECK: BEFORE
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// CHECK: WARNING: ThreadSanitizer: data race
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// CHECK-NOT: AFTER
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