windows核心编程之纤程

最新推荐文章于 2021-10-17 21:22:47 发布

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最新推荐文章于 2021-10-17 21:22:47 发布

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文章标签：纤程

纤程不同于线程，纤程和线程的区别
1.系统不认识纤程，所以，多纤程之间的切换完全由程序员自己调度
2.线程上下文之间切换需要开销，纤程之间切换由于完全受程序员控制，所以没有开销
3.多线程可以同步通讯，但是纤程之间完全不需要同步(线程运行受CPU调度影响，纤程不受CPU调度影响，不会产生同步问题)

纤程函数
PVOID ConvertThreadToFiber(PVOID pvParam);
该函数把当前线程转化为纤程，此时纤程已运行，注意这是跟另外一个纤程创建函数跟它的区别之一
返回值:纤程的运行环境的内存地址

LPVOID CreateFiber(
SIZE_T dwStackSize, // 初始栈大小
LPFIBER_START_ROUTINE lpStartAddress, // 纤程函数
LPVOID lpParameter // 纤程函数参数
);
该函数创建一个纤程，下面是lpStartAddress的原型
VOID CALLBACK FiberProc(
PVOID lpParameter // 纤程参数
);
CreateFiber创建纤程之后无法立即运行，还需要调用SwitchToFiber，切换到创建的纤程运行
VOID SwitchToFiber(
LPVOID lpFiber // 纤程的运行环境的内存地址，由ConvertThreadToFiber或者CreateFiber返回
);
若是想撤销纤程，则需要调用DeleteFiber
VOID DeleteFiber(
LPVOID lpFiber // 纤程的运行环境的内存地址
);
GetCurrentFiber可以获取当前纤程的运行环境的内存地址
GetFiberData可以获取纤程当前参数

下面附上源代码
resource.h

//{{NO_DEPENDENCIES}}
// Microsoft Visual C++ 生成的包含文件。
// 供 Counter.rc 使用
//
#define IDD_COUNTER                     101
#define IDI_COUNTER                     102
#define IDC_FIBER                       1000
#define IDC_ANSWER                      1001
#define IDC_COUNT                       1002
#define IDC_INFO                        1003
#define IDC_STATIC                      -1

// Next default values for new objects
// 
#ifdef APSTUDIO_INVOKED
#ifndef APSTUDIO_READONLY_SYMBOLS
#define _APS_NEXT_RESOURCE_VALUE        103
#define _APS_NEXT_COMMAND_VALUE         40001
#define _APS_NEXT_CONTROL_VALUE         1004
#define _APS_NEXT_SYMED_VALUE           101
#endif
#endif

main.cpp

#define _WIN32_WINNT _WIN32_WINNT_LONGHORN //这里一定要写

#include <Windows.h>
#include <windowsx.h>
#include <stdio.h>
#include "resource.h"
typedef enum
{
    BPS_STARTOVER,BPS_CONTINUE,BPS_DONE
}BKGNDSTATE;

typedef struct
{
    PVOID pFiberUI;
    HWND hwnd;
    BKGNDSTATE state;
}FIBERINFO,*PFIBERINFO;
void WINAPI FiberFunc(PVOID pvParam);
INT_PTR WINAPI DlgProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam);
FIBERINFO g_FiberInfo;
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE, LPSTR szCmdLine, int iCmdShow)
{
    g_FiberInfo.pFiberUI = ConvertThreadToFiber(NULL);
    PVOID pFiberCounter = NULL;
    g_FiberInfo.state = BPS_DONE;
    g_FiberInfo.hwnd = CreateDialog(hInstance, MAKEINTRESOURCE(IDD_COUNTER), NULL, DlgProc);
    SetDlgItemText(g_FiberInfo.hwnd, IDC_FIBER, TEXT("User Interface"));
    //维护一个消息循环
    bool fQuit = false;
    MSG msg;
    while (!fQuit)
    {
        if (PeekMessage(&msg, NULL, 0, 0, PM_REMOVE))
        {
            //如果能得到消息
            //还要检查是不是对话框消息
            if (!IsDialogMessage(g_FiberInfo.hwnd, &msg))
            {
                TranslateMessage(&msg);
                DispatchMessage(&msg);
            }
            fQuit = (msg.message == WM_QUIT);
        }
        else
        {
            switch (g_FiberInfo.state)
            {
            case BPS_DONE:
                WaitMessage();
                break;
            case BPS_STARTOVER:
                if (pFiberCounter != NULL)
                {
                    DeleteFiber(pFiberCounter);
                    pFiberCounter = NULL;
                }
                pFiberCounter=CreateFiber(0, FiberFunc, &g_FiberInfo);
                g_FiberInfo.state = BPS_CONTINUE;
            case BPS_CONTINUE:
                SwitchToFiber(pFiberCounter);
                SetDlgItemText(g_FiberInfo.hwnd, IDC_FIBER, TEXT("User Interface"));
                if (g_FiberInfo.state == BPS_DONE)
                {
                    DeleteFiber(pFiberCounter);
                    pFiberCounter = NULL;
                }
                break;
            }
        }
    }
    DestroyWindow(g_FiberInfo.hwnd);
    return 0;
}

INT_PTR WINAPI DlgProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    HINSTANCE hInstance;
    HICON hIcon;
    switch (message)
    {
        case WM_INITDIALOG: 
            hInstance=GetModuleHandleW(NULL);
            hIcon=LoadIcon(hInstance, MAKEINTRESOURCE(IDI_COUNTER));
            if (!hIcon)
            {
                MessageBox(NULL, TEXT("加载资源失败"), TEXT("error"), MB_OK);
                return 1;
            }
            PostMessage(hwnd,WM_SETICON,ICON_BIG,(LPARAM)hIcon);
            PostMessage(hwnd, WM_SETICON, ICON_SMALL, (LPARAM)hIcon);
            SetDlgItemInt(hwnd, IDC_COUNT, 0, false);
            return 1;
        case WM_COMMAND:
            switch (LOWORD(wParam))
            {
            case IDC_COUNT:
                if (HIWORD(wParam) == EN_CHANGE)
                {
                    g_FiberInfo.state = BPS_STARTOVER;
                }
                return 1;
            }
            return 0;
        case WM_CLOSE:
            PostQuitMessage(0);
            return 1;
    }
    return 0;
}

void WINAPI FiberFunc(PVOID pvParam)
{
    PFIBERINFO FiberInfo = (PFIBERINFO)pvParam;
    BOOL Suc;
    WORD value;
    char buffer[MAX_PATH];
    UINT Count = GetDlgItemInt(FiberInfo->hwnd, IDC_COUNT, &Suc, false);
    SetDlgItemText(g_FiberInfo.hwnd, IDC_FIBER, TEXT("Recalculation"));
    for (int i = 0; i <= Count; i++)
    {
        value = HIWORD(GetQueueStatus(QS_ALLEVENTS));
        sprintf(buffer, "%u", value);
        if ( value!= 0)
        {
            SwitchToFiber(FiberInfo->pFiberUI);
            SetDlgItemText(g_FiberInfo.hwnd, IDC_FIBER, TEXT("Recalculation"));
        }
        SetDlgItemTextA(g_FiberInfo.hwnd, IDC_INFO, buffer);
        SetDlgItemInt(FiberInfo->hwnd, IDC_ANSWER, i, FALSE);
        Sleep(200);
    }
    FiberInfo->state = BPS_DONE;
    SwitchToFiber(FiberInfo->pFiberUI);
}

Counter.rc

// Microsoft Visual C++ generated resource script.
//
#include "resource.h"

#define APSTUDIO_READONLY_SYMBOLS
/////////////////////////////////////////////////////////////////////////////
//
// Generated from the TEXTINCLUDE 2 resource.
//
#include "Windows.h"

/////////////////////////////////////////////////////////////////////////////
#undef APSTUDIO_READONLY_SYMBOLS

/////////////////////////////////////////////////////////////////////////////
// 英语(美国) resources

#if !defined(AFX_RESOURCE_DLL) || defined(AFX_TARG_ENU)
LANGUAGE LANG_ENGLISH, SUBLANG_ENGLISH_US
#pragma code_page(1252)

/////////////////////////////////////////////////////////////////////////////
//
// Dialog
//

IDD_COUNTER DIALOGEX 0, 0, 156, 37
STYLE DS_SETFONT | DS_3DLOOK | DS_CENTER | WS_MINIMIZEBOX | WS_VISIBLE | WS_CAPTION | WS_SYSMENU
CAPTION "Counter"
FONT 8, "MS Sans Serif", 0, 0, 0x0
BEGIN
    LTEXT           "Count to:",IDC_STATIC,4,6,34,8
    EDITTEXT        IDC_COUNT,38,4,40,14,ES_AUTOHSCROLL | ES_NUMBER
    LTEXT           "Answer:",IDC_STATIC,90,6,25,8
    RTEXT           "0",IDC_ANSWER,122,6,23,8
    LTEXT           "Currently running fiber:",IDC_INFO,4,24,75,8
    LTEXT           "Fiber",IDC_FIBER,80,24,72,8
END


/////////////////////////////////////////////////////////////////////////////
//
// DESIGNINFO
//

#ifdef APSTUDIO_INVOKED
GUIDELINES DESIGNINFO
BEGIN
    IDD_COUNTER, DIALOG
    BEGIN
        LEFTMARGIN, 7
        RIGHTMARGIN, 149
        TOPMARGIN, 7
        BOTTOMMARGIN, 30
    END
END
#endif    // APSTUDIO_INVOKED


#ifdef APSTUDIO_INVOKED
/////////////////////////////////////////////////////////////////////////////
//
// TEXTINCLUDE
//

1 TEXTINCLUDE 
BEGIN
    "resource.h\0"
END

2 TEXTINCLUDE 
BEGIN
    "#include ""Windows.h""\r\n"
    "\0"
END

3 TEXTINCLUDE 
BEGIN
    "\r\n"
    "\0"
END

#endif    // APSTUDIO_INVOKED


/////////////////////////////////////////////////////////////////////////////
//
// Icon
//

// Icon with lowest ID value placed first to ensure application icon
// remains consistent on all systems.
IDI_COUNTER             ICON                    "Counter.ico"
#endif    // 英语(美国) resources
/////////////////////////////////////////////////////////////////////////////



#ifndef APSTUDIO_INVOKED
/////////////////////////////////////////////////////////////////////////////
//
// Generated from the TEXTINCLUDE 3 resource.
//


/////////////////////////////////////////////////////////////////////////////
#endif    // not APSTUDIO_INVOKED