[簡單多線程式控制制]_[類比殺毒軟體線程式控制制]

情境:
1.在做業務庫時,目前有2種常見的狀態，開始，停止。假如需要增加一個暫停狀態的話。就需要線程式控制制。

要求:
1.參考殺毒的開始殺毒，繼續殺毒，暫停殺毒，停止殺毒4個狀態設計一個多線程程式。主線程式控制制背景工作執行緒的暫停，繼續和停止。注意，只能兩個線程,注意，背景工作執行緒只能是detach，不能是join,因為主線程不能被掛起.
2.必須使用pthread線程來實現(網站研發的可以用.net內建線程庫)，有時間自己可以實現win32版本。寫一個控制台或介面程式，介面程式可以模仿例子的，控制台程式可以輸入數字來代替按鈕按下。如:
1.開始掃描.
2.繼續掃描->暫停掃描切換.
3.停止掃描.

 

#include <stdio.h>#include <iostream>#include "pthread.h"typedef enum ButtonType{kStart = 0,  //開始kPause,  //暫停kStop,  //停止kContinue,  //繼續}ButtonType;typedef struct ThreadData{ButtonType type_;pthread_mutex_t mutex_;pthread_cond_t mian_cv_;pthread_cond_t work_cv_;}ThreadData;void *WorkThread(void *data){ThreadData *user_data = (ThreadData *)data;while (1){switch (user_data->type_){case kPause:{Sleep(1000);pthread_mutex_lock(&user_data->mutex_);//告訴主線程可以繼續pthread_cond_signal(&user_data->mian_cv_);//線程阻塞pthread_cond_wait(&user_data->work_cv_, &user_data->mutex_);pthread_mutex_unlock(&user_data->mutex_);if(user_data->type_ == kContinue){pthread_mutex_lock(&user_data->mutex_);pthread_cond_signal(&user_data->mian_cv_);pthread_mutex_unlock(&user_data->mutex_);}//pauseif (user_data->type_ == kStop){pthread_mutex_lock(&user_data->mutex_);pthread_cond_signal(&user_data->mian_cv_);pthread_mutex_unlock(&user_data->mutex_);return 0;}break;}case kStop:{//告訴主線程可以繼續pthread_mutex_lock(&user_data->mutex_);pthread_cond_signal(&user_data->mian_cv_);pthread_mutex_unlock(&user_data->mutex_);//結束進程return 0;}default:{break;}}//Sleep(1000);}}void PrintHelp(){std::cout<<"0  start"<<std::endl;std::cout<<"1  pause<->continue"<<std::endl;std::cout<<"2  stop"<<std::endl;std::cout<<"q  quit"<<std::endl;}//開始狀態只能一次//暫停<->繼續->停止//當背景工作執行緒處於正確狀態時，主線程可以工作別的//主線程式控制制背景工作執行緒狀態int main(int argc, char *argv[]){ThreadData data;data.type_ = kStop;pthread_cond_init(&data.mian_cv_, NULL);pthread_cond_init(&data.work_cv_, NULL);pthread_mutex_init(&data.mutex_, NULL);//列印協助資訊PrintHelp();int value;while (1){value = getchar();switch (value){case '0':  //0  start{if (data.type_ != kStop){std::cout<<"already start !"<<std::endl;break;}std::cout<<"start"<<std::endl;data.type_ = kStart;pthread_t id;pthread_create(&id, NULL, WorkThread, (void *)&data);pthread_detach(id);break;}case '1':  //1  pause<->continue{if (data.type_ == kStop){std::cout<<"not start !"<<std::endl;break;}pthread_mutex_lock(&data.mutex_);if (data.type_ == kPause){std::cout<<"cotinue"<<std::endl;data.type_ = kContinue;pthread_cond_signal(&data.work_cv_);}else{std::cout<<"pause"<<std::endl;data.type_ = kPause;}pthread_cond_wait(&data.mian_cv_, &data.mutex_);pthread_mutex_unlock(&data.mutex_);break;}case '2':  //2  stop{if (data.type_ == kStop){std::cout<<"already finish !"<<std::endl;break;}std::cout<<"stop"<<std::endl;pthread_mutex_lock(&data.mutex_);pthread_cond_signal(&data.work_cv_);data.type_ = kStop;pthread_cond_wait(&data.mian_cv_, &data.mutex_);pthread_mutex_unlock(&data.mutex_);break;}case 'q':  //quitbreak;default:break;}if (value == 'q'){break;}}pthread_cond_destroy(&data.mian_cv_);pthread_cond_destroy(&data.work_cv_);pthread_mutex_destroy(&data.mutex_);return 0;}

 

 

參考文章：

http://blog.csdn.net/ffilman/article/details/4871920