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#include <stdio.h>
#include <iostream>
using namespace std;
#include <unistd.h>
#include <pthread.h>
class JobBase
{
public:
bool start()
{
return createAndRun();
}
virtual ~JobBase();
protected:
JobBase(void* _jobParam,bool _joinable=false)
: jobStatus(Job_Unkown), thread(0),
jobParam(_jobParam),joinable(_joinable)
{}
protected:
/**
* @jobThread
* the faked thread entry to do special work
* @param: void* param, user defined thread parameter
* @return: void* as thread callback function
*/
static void* jobThread(void* param);
/**
* @jobEntry
* the real entry to do special work
* @param: void
* @return: void* as thread callback function
*/
virtual void* jobEntry() = 0; /*here, it would make the program terminated in runtime,system error: pure virtual method called
terminate called without an active exception
*/
virtual void onJobCompleted(void* jobRet);
/**
* @createAndRun
* create and start internal thread
* @params: void
* @return: true for success
*/
bool createAndRun();
protected:
typedef enum{
Job_Unkown = 0,
Job_Ready, //ready to be started
Job_Stopped, //not running
Job_Running, //is busy
Job_BeingExit //being exit, should do any further work
}JobStatus;
JobStatus jobStatus; //indicate the internal thread status
private:
pthread_t thread;
bool joinable;
void* jobParam;
};
bool JobBase::createAndRun()
{
bool bRet = false;
if(jobStatus==Job_Unkown){
pthread_attr_t attr;
pthread_attr_init(&attr);
if(!pthread_attr_setdetachstate(&attr,joinable?PTHREAD_CREATE_JOINABLE:PTHREAD_CREATE_DETACHED)){
if(!pthread_create(&thread,&attr,jobThread,jobParam)){
bRet = true;
jobStatus = Job_Running;
}
}
pthread_attr_destroy(&attr);
}
return bRet;
}
/*
void* JobBase::jobEntry()
{
cout<<"Stange"<<endl;
return NULL;
}
*/
void* JobBase::jobThread(void* param)
{
JobBase* pThis = (JobBase*)param;
if(pThis)
pThis->onJobCompleted(pThis->jobEntry());
return NULL;
}
void JobBase::onJobCompleted(void* jobRet)
{
cout<<"Job completed!"<<endl;
jobStatus = Job_Stopped;
}
JobBase::~JobBase()
{
if(jobStatus!=Job_Unkown && jobStatus==Job_Running){
if(joinable){
void* pret = NULL;
pthread_join(thread,&pret);
}else{
cout<<"Job was uncompleted, its unsafe!"<<endl;
}
}
}
class TestJob : public JobBase
{
public:
TestJob():JobBase(this,true){}
protected:
virtual void* jobEntry()
{
int i = 100;
while(i>0){
cout<<i<<endl;
--i;
fflush(stdout);
}
return NULL;
}
};
int main(int argc,char* argv[])
{
cout<<"Hello world!"<<endl;
TestJob job;
job.start();
fflush(stdout);
return 0;
}
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