应用java网站建设前景南宁百度seo软件

如果大家不太了解信号量、互斥锁和条件变量的，可以先看一下下面三篇文章。

• linux多线程之POSIX信号量-CSDN博客
• linux多线程之互斥锁-CSDN博客
• linux多线程之条件变量-CSDN博客

locker.h

#ifndef LOCKER_H
#define LOCKER_H#include <exception>
#include <pthread.h>
#include <semaphore.h>// 封装信号量
class sem
{
public:sem(){if( sem_init( &m_sem, 0, 0 ) != 0 ){throw std::exception();}}~sem(){sem_destroy( &m_sem );}bool wait(){return sem_wait( &m_sem ) == 0;}bool post(){return sem_post( &m_sem ) == 0;}private:sem_t m_sem;
};// 封装后斥锁
class locker
{
public:locker(){if( pthread_mutex_init( &m_mutex, NULL ) != 0 ){throw std::exception();}}~locker(){pthread_mutex_destroy( &m_mutex );}bool lock(){return pthread_mutex_lock( &m_mutex ) == 0;}bool unlock(){return pthread_mutex_unlock( &m_mutex ) == 0;}private:pthread_mutex_t m_mutex;
};// 封装条件变量
class cond
{
public:cond(){if( pthread_mutex_init( &m_mutex, NULL ) != 0 ){throw std::exception();}if ( pthread_cond_init( &m_cond, NULL ) != 0 ){pthread_mutex_destroy( &m_mutex );throw std::exception();}}~cond(){pthread_mutex_destroy( &m_mutex );pthread_cond_destroy( &m_cond );}bool wait(){int ret = 0;pthread_mutex_lock( &m_mutex );ret = pthread_cond_wait( &m_cond, &m_mutex );pthread_mutex_unlock( &m_mutex );return ret == 0;}bool signal(){return pthread_cond_signal( &m_cond ) == 0;}private:pthread_mutex_t m_mutex;pthread_cond_t m_cond;
};#endif