[并发并行]_[pthread]_[对工作线程进行简单控制-暂停-继续-停止]

1.使用命令行对线程简单控制。

界面和Win32版本的:

http://blog.csdn.net/xianglitian/article/details/6729851

场景:

1.在开发界面程序时,为了不让界面程序挂起，会新建一个工作线程来处理逻辑，主线程就能持续和用户交互。

2.pthread优点:跨平台。

耗时:3h

文件1： test_pthread.cpp

#include <stdio.h>#include "pthread.h"#include <iostream>using namespace std;enum DhThreadStatus{    kStop,    kRunning,    kPause};typedef struct DhThreadData{    int thread_status;    pthread_mutex_t mutex;//共享互斥量    //1.控制工作线程.    pthread_cond_t work_cond;//条件变量    //1.控制主线程.    pthread_cond_t main_cond;//条件变量    FILE* file;//记录日志}DhThreadData;void WriteLine(const char* str,FILE* file,bool is_print_console = true){    if(is_print_console)    {        printf("%s",str);    }    size_t log_length = strlen(str);    fwrite(str,log_length,1,file);    fflush(file);}void StopThread(DhThreadData* thread_data){    //call stop    //如果是扫描或暂停状态,通知线程停止扫描.    //等待线程结束.    pthread_mutex_lock(&thread_data->mutex);    thread_data->thread_status = kStop;    pthread_cond_signal(&thread_data->work_cond);//1.告诉工作线程可以继续了.    pthread_cond_wait(&thread_data->main_cond,&thread_data->mutex);//2.等待    pthread_mutex_unlock(&thread_data->mutex);    WriteLine("Continue response key press.\n",thread_data->file);}void * StartPthread(void * arg){    DhThreadData* data = (DhThreadData*)arg;    WriteLine("StartPthread begin scan.\n",data->file);    data->thread_status = kRunning;    while(true)    {        WriteLine("StartPthread scanning.\n",data->file,false);        //1.暂停        if(data->thread_status == kPause)        {            WriteLine("StartPthread pause thread.\n",data->file);            pthread_mutex_lock(&data->mutex);            pthread_cond_signal(&data->main_cond);            pthread_cond_wait(&data->work_cond,&data->mutex);            pthread_mutex_unlock(&data->mutex);            //1.返回时,状态是kRunning或者kStop.            if(data->thread_status == kRunning)            {                //1.告诉主线程继续.                WriteLine("StartPthread continue thread.\n",data->file);                pthread_cond_signal(&data->main_cond);            }        }        if(data->thread_status == kStop)        {            pthread_mutex_lock(&data->mutex);            pthread_cond_signal(&data->main_cond);            pthread_mutex_unlock(&data->mutex);            WriteLine("StartPthread Stop.\n",data->file);            break;        }        Sleep(500);    }    //1.告诉主线程继续,工作线程已结束.    return NULL;}void StartScan(DhThreadData* data){    pthread_t t1;    pthread_create(&t1, NULL, StartPthread, data);    pthread_detach(t1);}int main(int argc, char *argv[]){    setbuf(stdout, (char*) 0);    setbuf(stderr, (char*) 0);    FILE* file = fopen("log.txt","w");    WriteLine("begin........\n",file);    DhThreadData thread_data;    memset(&thread_data,0,sizeof(thread_data));    thread_data.file = file;    pthread_mutex_init(&thread_data.mutex,NULL);    pthread_cond_init(&thread_data.work_cond,NULL);    pthread_cond_init(&thread_data.main_cond,NULL);    int i;    WriteLine("1.开始扫描.\n2.继续扫描->暂停扫描切换.\n3.停止扫描.\nEnter q for exit:.\n",file);    while(1)    {        i = getchar();        if(i == '\n')        {            continue;        }        if(i == 'q')        {            if(thread_data.thread_status != kStop)            {                StopThread(&thread_data);            }            WriteLine("Exit.\n",file);            break;        }else if(i == '1')        {            if(thread_data.thread_status == kStop)            {                StartScan(&thread_data);            }else            {                WriteLine("Scanning.\n",file);                WriteLine("Continue response key press.\n",file);                continue;            }        }else if(i == '2')        {            if(thread_data.thread_status == kStop)            {                WriteLine("Press 1 for begin scanning.\n",file);                WriteLine("Continue response key press.\n",file);                continue;            }            //如果是暂停状态,通知线程继续扫描.            if(thread_data.thread_status == kPause)            {                //继续                pthread_mutex_lock(&thread_data.mutex);                thread_data.thread_status = kRunning;                pthread_cond_signal(&thread_data.work_cond);//1.告诉工作线程可以继续了.                pthread_cond_wait(&thread_data.main_cond,&thread_data.mutex);//2.等待                pthread_mutex_unlock(&thread_data.mutex);            }else            {                //暂停                pthread_mutex_lock(&thread_data.mutex);                thread_data.thread_status = kPause;                pthread_cond_wait(&thread_data.main_cond,&thread_data.mutex);                pthread_mutex_unlock(&thread_data.mutex);                            }            WriteLine("Continue response key press.\n",file);            continue;        }else if (i == '3')        {            if(thread_data.thread_status == kStop)            {                WriteLine("Scan has stopped.\n",file);                WriteLine("Continue response key press.\n",file);                continue;            }            StopThread(&thread_data);        }    }        pthread_mutex_destroy(&thread_data.mutex);    pthread_cond_destroy(&thread_data.work_cond);    pthread_cond_destroy(&thread_data.main_cond);    fclose(file);    WriteLine("end...........\n",file);    return 0;}

输出:

begin........1.开始扫描.2.继续扫描->暂停扫描切换.3.停止扫描.Enter q for exit:.StartPthread begin scan. //1StartPthread scanning.StartPthread scanning.StartPthread scanning.StartPthread scanning.StartPthread scanning.StartPthread scanning.StartPthread pause thread. //2Continue response key press.StartPthread continue thread. //2Continue response key press.StartPthread scanning.StartPthread scanning.StartPthread scanning.StartPthread scanning.StartPthread pause thread. //2Continue response key press.StartPthread continue thread. //2Continue response key press.StartPthread scanning.StartPthread scanning.StartPthread scanning.StartPthread scanning.StartPthread scanning.StartPthread scanning.StartPthread scanning.StartPthread Stop. //3Continue response key press.StartPthread begin scan. //1StartPthread scanning.StartPthread scanning.StartPthread scanning.StartPthread scanning.StartPthread scanning.StartPthread scanning.StartPthread scanning.StartPthread scanning.StartPthread scanning.StartPthread scanning.StartPthread scanning.StartPthread scanning.StartPthread scanning.StartPthread scanning.StartPthread scanning.StartPthread scanning.StartPthread pause thread. //2Continue response key press.StartPthread Stop. //3Continue response key press.StartPthread begin scan. //1StartPthread scanning.StartPthread scanning.StartPthread scanning.StartPthread scanning.StartPthread scanning.StartPthread scanning.StartPthread scanning.StartPthread scanning.StartPthread scanning.StartPthread scanning.StartPthread Stop. //3Continue response key press.StartPthread begin scan. //1StartPthread scanning.StartPthread scanning.StartPthread scanning.StartPthread scanning.StartPthread Stop. //qContinue response key press.Exit.