Linux多线程锁属性设置方法
更新时间:2017年01月05日 10:16:30 投稿:jingxian
下面小编就为大家带来一篇Linux多线程锁属性设置方法。小编觉得挺不错的,现在就分享给大家,也给大家做个参考。一起跟随小编过来看看吧
(福利推荐:【腾讯云】服务器最新限时优惠活动,云服务器1核2G仅99元/年、2核4G仅768元/3年,立即抢购>>>:9i0i.cn/qcloud)
(福利推荐:你还在原价购买阿里云服务器?现在阿里云0.8折限时抢购活动来啦!4核8G企业云服务器仅2998元/3年,立即抢购>>>:9i0i.cn/aliyun)
互斥锁是Linux下多线程资源保护的常用手段,但是在时序复杂的情况下,很容易会出现死锁的情况。
可以通过设置锁的属性,避免同一条线程重复上锁导致死锁的问题。
通过int pthread_mutexattr_settype(pthread_mutexattr_t *attr, int type)接口设置
一般是以下四种属性:
PTHREAD_MUTEX_NORMAL This type of mutex does not detect deadlock. A thread attempting to relock this mutex without first unlocking it will deadlock. Attempting to unlock a mutex locked by a different thread results in undefined behaviour. Attempting to unlock an unlocked mutex results in undefined behaviour. PTHREAD_MUTEX_ERRORCHECK This type of mutex provides error checking. A thread attempting to relock this mutex without first unlocking it will return with an error. A thread attempting to unlock a mutex which another thread has locked will return with an error. A thread attempting to unlock an unlocked mutex will return with an error. PTHREAD_MUTEX_RECURSIVE A thread attempting to relock this mutex without first unlocking it will succeed in locking the mutex. The relocking deadlock which can occur with mutexes of type PTHREAD_MUTEX_NORMAL cannot occur with this type of mutex. Multiple locks of this mutex require the same number of unlocks to release the mutex before another thread can acquire the mutex. A thread attempting to unlock a mutex which another thread has locked will return with an error. A thread attempting to unlock an unlocked mutex will return with an error. PTHREAD_MUTEX_DEFAULT Attempting to recursively lock a mutex of this type results in undefined behaviour. Attempting to unlock a mutex of this type which was not locked by the calling thread results in undefined behaviour. Attempting to unlock a mutex of this type which is not locked results in undefined behaviour. An implementation is allowed to map this mutex to one of the other mutex types.
这里主要指同一条线程重复上锁,不同线程上锁,无论设置什么属性,当锁已经被锁定后都会互斥阻塞。
使用PTHREAD_MUTEX_RECURSIVE属性,当同一条线程在没有解锁的情况下尝试再次锁定会返回成功。
以上就是小编为大家带来的Linux多线程锁属性设置方法全部内容了,希望大家多多支持程序员之家~
相关文章
CentOS6.5下Tomcat7 Nginx Redis配置步骤教程详解
这篇文章主要介绍了CentOS6.5下Tomcat7 Nginx Redis配置步骤,本文给大家介绍的非常详细,具有参考借鉴价值,需要的朋友可以参考下2016-10-10
最新评论