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14-2-locker.h
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#ifndef LOCKER_H_
#define LOCKER_H_
#include <exception>
#include <pthread.h>
#include <semaphore.h>
//封装信号量的类
class sem
{
public:
//创建并初始化信号量
sem()
{
if (sem_init(&m_sem, 0, 0) != 0)
{
//构造函数没有返回值,可以通过抛出异常来报告错误
throw std::exception();
}
}
//销毁信号量
~sem()
{
sem_destroy(&m_sem);
}
//等待信号量
bool wait()
{
return sem_wait(&m_sem) == 0;
}
//增加信号量
bool post()
{
return sem_post(&m_sem) == 0;
}
private:
sem_t m_sem;
};
//封装互斥锁的类
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;
};
//封装条件变量的类
class cond
{
public:
cond()
{
if (pthread_mutex_init(&m_mutex, NULL) != 0)
{
throw std::exception();
}
if (pthread_cond_init(&m_cond, NULL) != 0)
{
//构造函数中一旦出现问题,就应该立即释放已经成功分配了的资源
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