C/C++ 原生API实现线程池的方法

140 阅读 0 评论 93 点赞

我是靠谱客的博主活泼小天鹅，最近开发中收集的这篇文章主要介绍C/C++ 原生API实现线程池的方法，觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

线程池有两个核心的概念，一个是任务队列，一个是工作线程队列。任务队列负责存放主线程需要处理的任务，工作线程队列其实是一个死循环，负责从任务队列中取出和运行任务，可以看成是一个生产者和多个消费l者的模型。在一些高并发的网络应用中，线程池也是常用的技术。陈硕大神推荐的C++多线程服务端编程模式为：one loop per thread + thread pool，通常会有单独的线程负责接受来自客户端的请求，对请求稍作解析后将数据处理的任务提交到专门的计算线程池。

ThreadPool 线程池同步事件: 线程池内的线程函数同样支持互斥锁,信号控制,内核事件控制,临界区控制.

#include <Windows.h>
#include <iostream>
#include <stdlib.h>

unsigned long g_count = 0;

// --------------------------------------------------------------
// 线程池同步-互斥量同步
void NTAPI TaskHandlerMutex(PTP_CALLBACK_INSTANCE Instance, PVOID Context, PTP_WORK Work)
{
	// 锁定资源
	WaitForSingleObject(*(HANDLE *)Context, INFINITE);

	for (int x = 0; x < 100; x++)
	{
		printf("线程ID: %d ---> 子线程: %d n", GetCurrentThreadId(), x);
		g_count = g_count + 1;
	}

	// 解锁资源
	ReleaseMutexWhenCallbackReturns(Instance, *(HANDLE*)Context);
}

void TestMutex()
{
	// 创建互斥量
	HANDLE hMutex = CreateMutex(NULL, FALSE, NULL);

	PTP_WORK pool = CreateThreadpoolWork((PTP_WORK_CALLBACK)TaskHandlerMutex, &hMutex, NULL);

	for (int i = 0; i < 1000; i++)
	{
		SubmitThreadpoolWork(pool);
	}

	WaitForThreadpoolWorkCallbacks(pool, FALSE);
	CloseThreadpoolWork(pool);
	CloseHandle(hMutex);

	printf("相加后 ---> %d n", g_count);
}

// --------------------------------------------------------------
// 线程池同步-事件内核对象
void NTAPI TaskHandlerKern(PTP_CALLBACK_INSTANCE Instance, PVOID Context, PTP_WORK Work)
{
	// 锁定资源
	WaitForSingleObject(*(HANDLE *)Context, INFINITE);

	for (int x = 0; x < 100; x++)
	{
		printf("线程ID: %d ---> 子线程: %d n", GetCurrentThreadId(), x);
		g_count = g_count + 1;
	}

	// 解锁资源
	SetEventWhenCallbackReturns(Instance, *(HANDLE*)Context);
}

void TestKern()
{
	HANDLE hEvent = CreateEvent(NULL, FALSE, FALSE, NULL);
	SetEvent(hEvent);

	PTP_WORK pwk = CreateThreadpoolWork((PTP_WORK_CALLBACK)TaskHandlerKern, &hEvent, NULL);

	for (int i = 0; i < 1000; i++)
	{
		SubmitThreadpoolWork(pwk);
	}

	WaitForThreadpoolWorkCallbacks(pwk, FALSE);
	CloseThreadpoolWork(pwk);

	printf("相加后 ---> %d n", g_count);
}

// --------------------------------------------------------------
// 线程池同步-信号量同步
void NTAPI TaskHandlerSemaphore(PTP_CALLBACK_INSTANCE Instance, PVOID Context, PTP_WORK Work)
{
	// 锁定资源
	WaitForSingleObject(*(HANDLE *)Context, INFINITE);

	for (int x = 0; x < 100; x++)
	{
		printf("线程ID: %d ---> 子线程: %d n", GetCurrentThreadId(), x);
		g_count = g_count + 1;
	}

	// 解锁资源
	ReleaseSemaphoreWhenCallbackReturns(Instance, *(HANDLE*)Context, 1);
}

void TestSemaphore()
{
	// 创建信号量为100
	HANDLE hSemaphore = CreateSemaphore(NULL, 0, 100, NULL);

	ReleaseSemaphore(hSemaphore, 10, NULL);

	PTP_WORK pwk = CreateThreadpoolWork((PTP_WORK_CALLBACK)TaskHandlerSemaphore, &hSemaphore, NULL);

	for (int i = 0; i < 1000; i++)
	{
		SubmitThreadpoolWork(pwk);
	}

	WaitForThreadpoolWorkCallbacks(pwk, FALSE);
	CloseThreadpoolWork(pwk);
	CloseHandle(hSemaphore);

	printf("相加后 ---> %d n", g_count);
}

// --------------------------------------------------------------
// 线程池同步-临界区
void NTAPI TaskHandlerLeave(PTP_CALLBACK_INSTANCE Instance, PVOID Context, PTP_WORK Work)
{
	// 锁定资源
	EnterCriticalSection((CRITICAL_SECTION*)Context);

	for (int x = 0; x < 100; x++)
	{
		printf("线程ID: %d ---> 子线程: %d n", GetCurrentThreadId(), x);
		g_count = g_count + 1;
	}

	// 解锁资源
	LeaveCriticalSectionWhenCallbackReturns(Instance, (CRITICAL_SECTION*)Context);
}

void TestLeave()
{
	CRITICAL_SECTION cs;
	InitializeCriticalSection(&cs);

	PTP_WORK pwk = CreateThreadpoolWork((PTP_WORK_CALLBACK)TaskHandlerLeave, &cs, NULL);

	for (int i = 0; i < 1000; i++)
	{
		SubmitThreadpoolWork(pwk);
	}

	WaitForThreadpoolWorkCallbacks(pwk, FALSE);
	DeleteCriticalSection(&cs);
	CloseThreadpoolWork(pwk);

	printf("相加后 ---> %d n", g_count);
}

int main(int argc,char *argv)
{
	//TestMutex();
	//TestKern();
	//TestSemaphore();
	TestLeave();

	system("pause");
	return 0;
}

简单的IO读写：

#include <Windows.h>
#include <iostream>
#include <stdlib.h>

// 简单的异步文本读写
int ReadWriteIO()
{
	char enContent[] = "hello lyshark";
	char deContent[255] = { 0 };

	// 异步写文件
	HANDLE hFileWrite = CreateFile(L"d://test.txt", GENERIC_WRITE, 0, NULL, OPEN_ALWAYS, FILE_FLAG_SEQUENTIAL_SCAN, NULL);
	if (INVALID_HANDLE_VALUE == hFileWrite)
	{
		return 0;
	}

	WriteFile(hFileWrite, enContent, strlen(enContent), NULL, NULL);
	FlushFileBuffers(hFileWrite);

	CancelSynchronousIo(hFileWrite);
	CloseHandle(hFileWrite);

	// 异步读文件

	HANDLE hFileRead = CreateFile(L"d://test.txt", GENERIC_READ, 0, NULL, OPEN_ALWAYS, NULL, NULL);
	if (INVALID_HANDLE_VALUE == hFileRead)
	{
		return 0;
	}

	ReadFile(hFileRead, deContent, 255, NULL, NULL);
	CloseHandle(hFileRead);
	std::cout << "读出内容: " << deContent << std::endl;
	return 1;
}


// 通过IO获取文件大小
int GetFileSize()
{
	HANDLE hFile = CreateFile(L"d://test.txt", 0, 0, NULL, OPEN_EXISTING, NULL, NULL);
	if (INVALID_HANDLE_VALUE == hFile)
	{
		return 0;
	}

	ULARGE_INTEGER ulFileSize;
	ulFileSize.LowPart = GetFileSize(hFile, &ulFileSize.HighPart);

	LARGE_INTEGER lFileSize;
	BOOL ret = GetFileSizeEx(hFile, &lFileSize);

	std::cout << "文件大小A: " << ulFileSize.QuadPart << " bytes" << std::endl;
	std::cout << "文件大小B: " << lFileSize.QuadPart << " bytes" << std::endl;
	CloseHandle(hFile);

	return 1;
}

// 通过IO设置文件指针和文件尾
int SetFilePointer()
{
	char deContent[255] = { 0 };
	DWORD readCount = 0;

	HANDLE hFile = CreateFile(L"d://test.txt", GENERIC_WRITE, 0, NULL, OPEN_ALWAYS, NULL, NULL);
	if (INVALID_HANDLE_VALUE == hFile)
	{
		return 0;
	}

	LARGE_INTEGER liMove;

	// 设置移动位置
	liMove.QuadPart = 2;
	SetFilePointerEx(hFile, liMove, NULL, FILE_BEGIN);

	// 移动到文件末尾
	SetEndOfFile(hFile);

	ReadFile(hFile, deContent, 255, &readCount, NULL);
	std::cout << "移动指针后读取: " << deContent << " 读入长度: " << readCount << std::endl;

	CloseHandle(hFile);

	// 设置编码格式
	_wsetlocale(LC_ALL, L"chs");
	setlocale(LC_ALL, "chs");
	wprintf(L"%s", deContent);
}

int main(int argc,char *argv)
{
	// 读写IO
	ReadWriteIO();

	// 取文件长度
	GetFileSize();

	// 设置文件指针
	SetFilePointer();

	return 0;
}

到此这篇关于C/C++ 原生API实现线程池的文章就介绍到这了,更多相关C++实现线程池内容请搜索靠谱客以前的文章或继续浏览下面的相关文章希望大家以后多多支持靠谱客！