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#include<unistd.h>#include <pthread.h>#include<iostream>class RWLock{ // 读写锁  public:      RWLock();  ~RWLock();   void read_lock();   void read_unlock();   void write_lock();   void write_unlock();     private:    pthread_mutex_t write_m_;     pthread_mutex_t count_m_;     int count_; }RWLock::RWLock():count_(0){  pthread_mutex_init(&write_m_,NULL);  pthread_mutex_init(&count_m_,NULL);  }RWLock::~RWLock(){  pthread_mutex_destory(&write_m_);  phtread_mutex_destory(&count_m_);         }void RWLock::read_lock(){  pthread_mutex_lock(&count_m_);      if(count_==0){    pthread_mutex_lock(&write_m_);     }               ++count_;       pthread_mutex_unlock(&count_m_);              }void RWLock::read_unlock(){  pthread_mutex_lock(&count_m_);  --count_;  if(count_==0){    pthread_mutex_unlock(&write_m_);      }    pthread_mutex_unlock(&count_m_);      }void RWLock::write_lock(){  pthread_mutex_lock(&write_m_);        }void RWLock::write_unlock(){  pthread_unlock(&write_m_);        }