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线程池

实现线程类

#pragma once#include <pthread.h>
#include <iostream>
#include <vector>
#include <string>
#include <cstdlib>
#include <cstring>
#include <functional>
#include <unistd.h>
#include "sem.hpp"
using namespace std;class Thread
{using func_t = function<void(string)>;public:void Excute(){_func(_threadname);}
public:Thread(func_t func, const std::string &name="none-name"): _func(func), _threadname(name), _stop(true){}static void *threadroutine(void *args) // 类成员函数，形参是有this指针的！！{Thread *self = static_cast<Thread *>(args);self->Excute();return nullptr;}bool Start(){int n = pthread_create(&_tid, nullptr, threadroutine, this);if(!n){_stop = false;return true;}else{return false;}}void Detach(){if(!_stop){pthread_detach(_tid);}}void Join(){if(!_stop){pthread_join(_tid, nullptr);}}std::string name(){return _threadname;}void Stop(){_stop = true;}~Thread() {}private:pthread_t _tid;std::string _threadname;func_t _func;bool _stop;
};

任务类

这个就随便写了，用来简单测试。

#include <iostream>
using namespace std;class Task
{
public:void Compare(){cout << "compare" << endl;}void operator()(){Compare();}int a = 1;
int b = 2;};

线程池类

#include "Thread_pool.hpp"
#include <queue>const int g_pthreadnum = 6;pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
pthread_cond_t cond = PTHREAD_COND_INITIALIZER;//线程池
template<class T>
class ThreadPool
{
public:ThreadPool(int num = g_pthreadnum):pthreadnum(num),state(false),waitnum(0){}void Everydo(string name){while(true){Lock();while(qtask.empty() && state){waitnum++;Wait_Pthread();waitnum--;}if(qtask.empty() && !state){UnLock();cout << name << ": quit" << endl;break;}T task = qtask.front();qtask.pop();task();UnLock();}}bool Push(const T& t){Lock();bool ret = false;if(state){qtask.push(t);if(waitnum > 0) WakeUp_sigle();ret = true;}UnLock();return ret;}void ThreadInit(){for(int i=0; i<pthreadnum; i++){string name = "pthread-" + to_string(i);vthread.emplace_back(bind(&ThreadPool::Everydo, this, placeholders::_1), name);  //每个线程都要执行这个方法，这个方法会将任务队列中的任务分配给他们}}void Wait(){for(auto &e : vthread) e.Join();}void Quit(){state = false;WakeUp_All();}void Start(){state = true;for(auto &e : vthread) e.Start();}private://线程池需要什么？线程数量，保存线程的容器int pthreadnum;vector<Thread> vthread;//一个任务队列,创建线程池对象时，线程创建好，我们需要从外部接收任务分配给线程执行//我们希望能够接收任意类型的任务，仿函数，函数，lambda表达式等，所以使用模板queue<T> qtask;//一个状态，控制线程池的退出bool state;int waitnum;void Lock(){pthread_mutex_lock(&mutex);}void UnLock(){pthread_mutex_unlock(&mutex);}void WakeUp_sigle(){pthread_cond_signal(&cond);}void WakeUp_All(){pthread_cond_broadcast(&cond);}void Wait_Pthread(){pthread_cond_wait(&cond, &mutex);}
};

测试