线程池之预提交work item_线程 workitem-优快云博客

本文介绍了一段使用线程池、工作项和回调函数的C++代码实现，展示了如何通过线程池并行处理大量任务，以及如何在任务执行过程中进行状态跟踪和输出。

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#include "stdafx.h"
#include <conio.h>
#include <iostream>
#include <algorithm>
#include <vector>
using namespace std;
VOID NTAPI SimpleCallback(PTP_CALLBACK_INSTANCE pInstance, PVOID pvContext)
{
	cout << "[ " << GetCurrentThreadId() << " ]" << " simpleCallback\n";
}
CRITICAL_SECTION g_cs;
const int totalWorkItems = 100000;
PTP_WORK pWorks[totalWorkItems];
DWORD g_ThreadIds[totalWorkItems] = { 0 };

VOID CALLBACK WorkItemCallback(PTP_CALLBACK_INSTANCE Instance, PVOID pvContex, PTP_WORK Work)
{
	EnterCriticalSection(&g_cs);
	cout << "[ " << (g_ThreadIds[int(pvContex)] = GetCurrentThreadId()) << " ]" << "WorkItemCallback(), params = " << (int)pvContex << endl;
	LeaveCriticalSection(&g_cs);
}
void WaitKbhit()
{
	while(!_kbhit());
}
int _tmain(int argc, _TCHAR* argv[])
{
	for (int i = 0; i < totalWorkItems; ++i)
	{
		pWorks[i] = CreateThreadpoolWork(&WorkItemCallback, (PVOID)i, NULL);
	}
	InitializeCriticalSection(&g_cs);
	for (int i = 0; i < totalWorkItems; ++i)
	{
		SubmitThreadpoolWork(pWorks[i]);
	}
	WaitKbhit();
	sort(g_ThreadIds, g_ThreadIds + totalWorkItems);
	vector<DWORD> vThreadIds;
	unique_copy(g_ThreadIds, g_ThreadIds + totalWorkItems, back_inserter(vThreadIds));
	copy(vThreadIds.begin(), vThreadIds.end(), ostream_iterator<DWORD>(cout, ", "));
	cout << "\n total thread ids = " << vThreadIds.size() << endl;
	DeleteCriticalSection(&g_cs);
	return 0;
}