首先，第一段代码 void func(pthread_mutex_t mutex1){ pthread_mutex_lock(&mutex1); cou...
int pthread_mutex_init(pthread_mutex_t *restrict mutex, const pthread_mutexattr_t *restrict attr); pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER; int pthread_mutex_lock(pthread_mutex_t *mutex); int pthread_mutex_trylock(pthread_mutex_t *mutex); int pthread_mutex_unlock(pthread_mutex_t ...
在这种情况下,对pthread_mutex_destroy子例程的调用是对健壮互斥的唯一允许操作。 函数pthread_mutex_trylock与pthread_mutex_lock相同,只是如果mutex参数所引用的健壮互斥对象被任何线程 (包括当前线程) 锁定,那么调用将立即返回。 pthread_mutex_unlock函数释放互斥对象所引用的互斥对象。 释放互斥对象的方式...
intret;ret= pthread_ mutex_lock(&mp); /* acquire the mutex */ 当pthread_mutex_lock()返回时,该互斥锁已被锁定。调用线程是该互斥锁的属主。如果该互斥锁已被另一个线程锁定和拥有,则调用线程将阻塞,直到该互斥锁变为可用为止。 对于 Solaris 线程,请参见mutex_lock语法。 如果互斥锁类型为PTHREAD_MUT...
对已锁定的互斥对象上调用 pthread_mutex_lock() 的所有线程都将进入睡眠状态,这些睡眠的线程将“排队”访问这个互斥对象。 从上述可知,mutex会帮助我们锁定一段逻辑区域的访问。但是,如果一个数据对象有多处调用的情况,我们需要根据实际情况,设计统一的接口。
在pthread_mutex_lock函数中,我们需要根据实际情况添加加锁互斥锁的逻辑。 6. 步骤四:调用pthread_mutex_lock函数 最后,我们需要调用pthread_mutex_lock函数来实现互斥锁的加锁。下面是调用pthread_mutex_lock函数的代码: mutex=pthread_mutex_t()# 创建互斥锁对象# 调用pthread_mutex_lock函数result=pthread_mutex_lo...
pthread_mutex_lock ---互斥锁上锁 pthread_mutex_unlock ---互斥锁解锁 pthread_cond_wait() / pthread_cond_timedwait ---等待条件变量,挂起线程,区别是后者,会有timeout时间,如 果到了timeout,线程自动解除阻塞,这个时间和 time()系统调用相同意义的。以1970年时间算起。 pthread...
When a thread successfully acquires a mutex for the first time, the lock count is set to 1. Every time a thread relocks this mutex, the lock count is incremented by one. Each time the thread unlocks the mutex, the lock count is decremented by one. When the lock count reaches 0, the...
PTHREAD_MUTEX_RECURSIVE A recursive type mutex permits a thread to lock many times. That is, a thread attempting to relock this mutex without first unlocking will succeed. This type of mutex must be unlocked the same number to times it is locked before the mutex will be returned to an unlo...