1 /* Copyright (c) 2002-2023. The SimGrid Team. All rights reserved. */
3 /* This program is free software; you can redistribute it and/or modify it
4 * under the terms of the license (GNU LGPL) which comes with this package. */
6 /* Simple test code that may deadlock:
8 Thread 1 locks mutex1 then mutex2 while thread 2 locks in reverse order.
9 Deadlock occurs when each thread get one mutex and then ask for the other one.
15 pthread_mutex_t mutex1;
16 pthread_mutex_t mutex2;
18 static void* thread_fun1(void* val)
20 pthread_mutex_lock(&mutex1);
21 pthread_mutex_lock(&mutex2);
22 pthread_mutex_unlock(&mutex1);
23 pthread_mutex_unlock(&mutex2);
25 fprintf(stderr, "The thread %d is terminating.\n", *(int*)val);
28 static void* thread_fun2(void* val)
30 pthread_mutex_lock(&mutex2);
31 pthread_mutex_lock(&mutex1);
32 pthread_mutex_unlock(&mutex1);
33 pthread_mutex_unlock(&mutex2);
35 fprintf(stderr, "The thread %d is terminating.\n", *(int*)val);
39 int main(int argc, char* argv[])
41 pthread_mutex_init(&mutex1, NULL);
42 pthread_mutex_init(&mutex2, NULL);
47 pthread_create(&thread1, NULL, thread_fun1, &id[0]);
48 pthread_create(&thread2, NULL, thread_fun2, &id[1]);
49 fprintf(stderr, "All threads are started.\n");
50 pthread_join(thread1, NULL);
51 pthread_join(thread2, NULL);
53 pthread_mutex_destroy(&mutex1);
54 pthread_mutex_destroy(&mutex2);
56 fprintf(stderr, "User's main is terminating.\n");