1 // RUN: %clangxx_tsan %s -o %t 2 // RUN: not %run %t 5 2>&1 | FileCheck %s 3 // RUN: not %run %t 10 2>&1 | FileCheck %s 4 // RUN: not %run %t 15 2>&1 | FileCheck %s 5 // RUN: not %run %t 20 2>&1 | FileCheck %s 6 // RUN: %run %t 30 2>&1 | FileCheck %s --check-prefix=CHECK-TOO-LONG-CYCLE 7 8 #include <pthread.h> 9 #include <stdio.h> 10 #include <stdlib.h> 11 main(int argc,char * argv[])12int main(int argc, char *argv[]) { 13 int num_mutexes = 5; 14 if (argc > 1) num_mutexes = atoi(argv[1]); 15 16 pthread_mutex_t m[num_mutexes]; 17 for (int i = 0; i < num_mutexes; ++i) 18 pthread_mutex_init(&m[i], NULL); 19 20 for (int i = 0; i < num_mutexes - 1; ++i) { 21 pthread_mutex_lock(&m[i]); 22 pthread_mutex_lock(&m[i + 1]); 23 24 pthread_mutex_unlock(&m[i]); 25 pthread_mutex_unlock(&m[i + 1]); 26 } 27 28 pthread_mutex_lock(&m[num_mutexes - 1]); 29 pthread_mutex_lock(&m[0]); 30 31 pthread_mutex_unlock(&m[num_mutexes - 1]); 32 pthread_mutex_unlock(&m[0]); 33 34 for (int i = 0; i < num_mutexes; ++i) 35 pthread_mutex_destroy(&m[i]); 36 37 fprintf(stderr, "PASS\n"); 38 } 39 40 // CHECK: ThreadSanitizer: lock-order-inversion (potential deadlock) 41 // CHECK-TOO-LONG-CYCLE: WARNING: too long mutex cycle found 42 // CHECK: PASS 43