Linux3种线程同步机制的封装

#ifndef LOCKER_H

#define LOCKER_H
#include <exception>
#include <pthread.h>
#include <semaphore.h>
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;
};
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;
};
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

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