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150
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1 // RUN: %clangxx_tsan -O1 --std=c++11 %s -o %t && %deflake %run %t 2>&1 | FileCheck %s
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2 #include "custom_mutex.h"
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3
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4 // Test that failed TryLock does not induce parasitic synchronization.
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5
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6 Mutex mu(true, 0);
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7 long data;
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8
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9 void *thr(void *arg) {
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10 mu.Lock();
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11 data++;
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12 mu.Unlock();
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13 mu.Lock();
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14 barrier_wait(&barrier);
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15 barrier_wait(&barrier);
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16 mu.Unlock();
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17 return 0;
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18 }
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19
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20 int main() {
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21 barrier_init(&barrier, 2);
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22 pthread_t th;
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23 pthread_create(&th, 0, thr, 0);
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24 barrier_wait(&barrier);
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25 if (mu.TryLock()) {
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26 fprintf(stderr, "TryLock succeeded, should not\n");
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27 exit(0);
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28 }
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29 data++;
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30 barrier_wait(&barrier);
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31 pthread_join(th, 0);
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32 fprintf(stderr, "DONE\n");
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33 return 0;
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34 }
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35
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36 // CHECK: ThreadSanitizer: data race
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37 // CHECK-NEXT: Write of size 8 at {{.*}} by main thread:
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38 // CHECK-NEXT: #0 main {{.*}}custom_mutex1.cpp:29
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39 // CHECK: DONE
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