apc-优快云博客

本文通过一个具体的示例代码详细介绍了 Windows 操作系统中异步过程调用 (APC) 的工作原理及其使用方法。文章演示了如何创建线程、使用 APC 在线程中插入回调函数，并展示了如何通过事件来控制线程的运行状态。

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#include <windows.h>
#include <stdio.h>

DWORD WINAPI WorkThread(PVOID pParam)
{
HANDLE Event = (HANDLE)pParam;

for(;;)
{
DWORD dwRet = WaitForSingleObjectEx(Event, INFINITE, TRUE);
if(dwRet == WAIT_OBJECT_0)
{
printf("(tid=%d)WAIT_OBJECT_0\n", GetCurrentThreadId());
break;
}
else if(dwRet == WAIT_IO_COMPLETION)
{
printf("(tid=%d)WAIT_IO_COMPLETION\n", GetCurrentThreadId());
}
}

return 0;
}

VOID CALLBACK APCProc(DWORD dwParam)
{
printf("(tid=%d)%s", GetCurrentThreadId(), (PVOID)dwParam);
}

void TestAPC(BOOL bFast)
{
HANDLE QuitEvent = CreateEvent(NULL, FALSE, FALSE, NULL);

HANDLE hThread = CreateThread(NULL,
0,
WorkThread,
(PVOID)QuitEvent,
0,
NULL);

Sleep(100); // Wait for WorkThread initialized.

for(int i=5; i>0; i--)
{
printf("(tid=%d)QueueUserAPC(APCProc, hThread)\n", GetCurrentThreadId());
QueueUserAPC(APCProc, hThread, (DWORD)(PVOID)"APC here\n");

if(!bFast)
Sleep(5000);
}

SetEvent(QuitEvent);
printf("(tid=%d)SetEvent(QuitEvent)\n", GetCurrentThreadId());
WaitForSingleObject(hThread, INFINITE);
Sleep(10000);
CloseHandle(hThread);
}

int main()
{
TestAPC(FALSE);
}