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 Global;
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pthread_mutex_t mtx;
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void *Thread1(void *x) {
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  pthread_mutex_lock(&mtx);
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  Global++;
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  pthread_mutex_unlock(&mtx);
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  barrier_wait(&barrier);
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  return NULL;
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}
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void *Thread2(void *x) {
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  barrier_wait(&barrier);
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  Global--;
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  return NULL;
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}
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int main() {
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  barrier_init(&barrier, 2);
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  // CHECK: WARNING: ThreadSanitizer: data race
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  // CHECK:   Write of size 4 at {{.*}} by thread T2:
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  // CHECK:   Previous write of size 4 at {{.*}} by thread T1
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  // CHECK:                     (mutexes: write [[M1:M[0-9]+]]):
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  // CHECK:   Mutex [[M1]] (0x{{.*}}) created at:
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  // CHECK:     #0 pthread_mutex_init
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  // CHECK:     #1 main {{.*}}mutexset2.cpp:[[@LINE+1]]
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  pthread_mutex_init(&mtx, 0);
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  pthread_t t[2];
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  pthread_create(&t[0], NULL, Thread1, NULL);
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  pthread_create(&t[1], NULL, Thread2, NULL);
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  pthread_join(t[0], NULL);
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  pthread_join(t[1], NULL);
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  pthread_mutex_destroy(&mtx);
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}
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