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Re: Trying to develop a pool executor from pthreads... in C++
- From: gcherian <gcherian dot 142857 at gmail dot com>
- To: pthreads-win32 at sourceware dot org
- Date: Tue, 27 Jan 2009 17:27:55 -0800 (PST)
- Subject: Re: Trying to develop a pool executor from pthreads... in C++
- References: <61e59ce30710120512i40fd0912t1df90a33c59e9f26@mail.gmail.com>
Hello,
Runner class should be inheriting the Runnable (to override the virtual
run() method)
-George Cherian
mlnglstaccram alksjd wrote:
>
> For the sake of learning i am trying to develp a pool executor... but
> it doesnt work.. can u ppl tell me where i am goin wrong? I am getting
> an assertion failure in windows in the line below with comments, in
> file PoolExecutor.h..
>
>
> /*
> main.cpp
> */
> #include <pthread.h>
> #include <iostream>
> #include <windows.h>
> #include "PoolExecutor.h"
>
>
>
> using namespace std;
>
> class Runner{
> public:
> Runner(){}
> ~Runner(){}
> void run(){
> for(int i=0;i<100;++i)
> cout<<"i="<
> #include<queue>
> #include<windows.h>
>
> class PoolExecutor;
> void *func(void *temp);
>
> class Runnable{
> public:
> virtual void run()=0;
> };
>
>
> class Thread{
> pthread_t threadId;
> Runnable *runnable;
> public:
> Thread(){
> runnable=NULL;
> }
>
> void start(PoolExecutor *pthRun){
> int started = pthread_create (&threadId, NULL, func,
> pthRun);
> std::cout<< started<<std::endl;
> }
>
> void join(){
> pthread_join(threadId,NULL);
> }
>
> };
>
>
>
> class PoolExecutor{
> Thread *threads;
> int N;
> bool cancelled ;
> std::queue<Runnable*> taskQueue;
> pthread_mutex_t taskQueueMutex;
> public:
> PoolExecutor(int numberOfThreads){
> N=numberOfThreads;
> if(numberOfThreads<=0 && numberOfThreads>512)
> N=5;
> cancelled= false;
> pthread_mutex_init(&taskQueueMutex,NULL);
> threads = new Thread[N];
> for(int i=0;i<N;++i)
> threads[i].start(this);
> }
> ~PoolExecutor(){
> cancelled = true;
> for(int i=0;i<N;++i)
> threads[i].join();
> delete[] threads;
> }
>
> void execute(Runnable* runnable ){
> pthread_mutex_lock(&taskQueueMutex);
> taskQueue.push(runnable);
> pthread_mutex_unlock(&taskQueueMutex);
> }
>
> void* runMethod(void * param){
> for(;;){
> while(taskQueue.empty()&& !cancelled){
> Sleep(100);
> }
> if(cancelled){
> return NULL;
> }
> pthread_mutex_lock(&taskQueueMutex);
> if(taskQueue.empty()){
> pthread_mutex_unlock(&taskQueueMutex);
> continue;
> }
> Runnable *runnable = (Runnable *)taskQueue.front();
> ////////////////////////////////////////////////////////////////////////////////////////////////
> //////////////////////////////////// i get error in the above line
> ////////////////////////////////////////////////////////////////////////////////////////////////
> taskQueue.pop();
> pthread_mutex_unlock(&taskQueueMutex);
> runnable->run();
> delete runnable;
> if(cancelled){
> return NULL;
> }
> }
> return NULL;
> }
>
> };
>
> void *func(void *temp){
> PoolExecutor *poolExecutor = (PoolExecutor *)temp;
> return poolExecutor->runMethod(NULL);
> }
>
> Thanks
>
>
--
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