初始化之后,我们接着看看pthread_mutex_lock操作: 1#ifndef __pthread_mutex_lock2strong_alias (__pthread_mutex_lock, pthread_mutex_lock)3hidden_def (__pthread_mutex_lock)4#endif56int7__pthread_mutex_lock (pthread_mutex_t *mutex)8{9assert (sizeof(mutex->__size) >=sizeof(mutex->__data)...
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_lock(ctypes.byref(mutex))ifresult==0:print("互斥锁加锁成功")else:pri...
pthread_mutex_unlock; 相关说明如下: PTHREAD_MUTEX_UNLOCK(3) BSD Library Functions Manual PTHREAD_MUTEX_UNLOCK(3) NAME pthread_mutex_unlock -- unlock a mutex SYNOPSIS #include<pthread.h>int pthread_mutex_unlock(pthread_mutex_t *mutex); DESCRIPTION If the current thread holds the lock on mutex,...
pthread_mutex_t *mutex; int pthread_mutex_unlock (mutex) pthread_mutex_t *mutex; 描述 通过调用pthread_mutex_lock来锁定mutex参数引用的互斥对象。 如果互斥对象已锁定,那么调用线程将阻塞,直到互斥对象变为可用为止。 此操作将返回由处于锁定状态的mutex参数引用的互斥对象,调用线程作为其所有者。
pthread_mutex_tlock; } ct_sum;void* add1(void*cnt) { pthread_mutex_lock(&(((ct_sum*)cnt)->lock)); printf("get lock thread1 id:%lu\n", pthread_self()); sleep(5);inti;for( i=0;i<50;i++) {(*(ct_sum*)cnt).sum+=i; ...
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...
1：pthread_mutex_init(pthread_mutex_t * mutex,const pthread_mutexattr_t *attr);初始化锁变量mutex。attr为锁属性，NULL值为默认属性。2：pthread_mutex_lock(pthread_mutex_t *mutex);加锁 3：pthread_mutex_tylock(pthread_mutex_t *mutex);加锁，但是与2不⼀样的是当锁已经在使⽤的时候，返回为...
futex全称是fast user-space locking,也就是快速用户空间锁,在linux下使用C语言写多线程程序时,在需要线程同步的地方会经常使用pthread_mutex_lock()函数对临界区进行加锁,如果加锁失败线程就会挂起,这就是互斥锁。但是pthread_mutex_lock并不是立即进行系统调用,而是首先在用户态进行CAS操作,判断其它线程是否已经获取...
#define _UNIX03_THREADS #include <pthread.h> int pthread_mutex_lock(pthread_mutex_t *mutex); General description Locks a mutex object, which identifies a mutex. Mutexes are used to protect shared resources. If the mutex is already locked by another thread, the thread waits for the mutex to...