/*********************************************************************************
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* Copyright: (C) 2025 LingYun IoT System Studio
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* All rights reserved.
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*
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* Filename: deadlock.c
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* Description: This file is deadlock example program.
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*
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* Version: 1.0.0(11/04/2025)
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* Author: Guo Wenxue <guowenxue@gmail.com>
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* ChangeLog: 1, Release initial version on "11/04/2025 05:43:15 PM"
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*
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********************************************************************************/
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#include <stdio.h>
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#include <unistd.h>
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#include <pthread.h>
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pthread_mutex_t lock1 = PTHREAD_MUTEX_INITIALIZER;
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pthread_mutex_t lock2 = PTHREAD_MUTEX_INITIALIZER;
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void *thread1(void *arg)
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{
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pthread_mutex_lock(&lock1); // 获取锁1
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sleep(1); // 确保thread2能获取锁2
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pthread_mutex_lock(&lock2); // 请求锁2 → 死锁！
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printf("Thread1 got both locks\n");
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pthread_mutex_unlock(&lock2);
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pthread_mutex_unlock(&lock1);
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return NULL;
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}
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void *thread2(void *arg)
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{
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pthread_mutex_lock(&lock2); // 获取锁2
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sleep(1); // 确保thread1能获取锁1
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pthread_mutex_lock(&lock1); // 请求锁1 → 死锁！
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printf("Thread2 got both locks\n");
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pthread_mutex_unlock(&lock1);
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pthread_mutex_unlock(&lock2);
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return NULL;
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}
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int main (int argc, char **argv)
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{
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pthread_t t1, t2;
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pthread_create(&t1, NULL, thread1, NULL);
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pthread_create(&t2, NULL, thread2, NULL);
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pthread_join(t1, NULL);
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pthread_join(t2, NULL);
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return 0;
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}
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