c++ threadpool.h

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本文介绍了一个简单的线程池实现方案，包括WorkerThread类和ThreadPool类的设计。WorkerThread类需被用户继承并实现executeThis方法来定义具体任务，而ThreadPool类负责管理线程池中的所有活动，如跟踪空闲线程及同步所有线程。

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//threadpool.h

#include <pthread.h>
#include <semaphore.h>
#include <iostream>
#include <vector>

using namespace std;
/*
WorkerThread class
This class needs to be sobclassed by the user.
*/
class WorkerThread{
public:
int id;
    unsigned virtual executeThis()
{
return 0;
}

WorkerThread(int id) : id(id) {}
virtual ~WorkerThread(){}
};

/*
ThreadPool class manages all the ThreadPool related activities. This includes keeping track of idle threads and ynchronizations between all threads.
*/
class ThreadPool{
public:
ThreadPool();
ThreadPool(int maxThreadsTemp);
virtual ~ThreadPool();
private:
int maxThreads;

pthread_cond_t condCrit;
sem_t availableWork;
sem_t availableThreads;

//WorkerThread ** workerQueue;
vector<WorkerThread *> workerQueue;

int topIndex;
int bottomIndex;
    int incompleteWork;
    int queueSize;
};