VC++如何使用互斥量创建进程_vc++互斥,c++互斥量资源-CSDN文库

共13个文件

h：4个

cpp：3个

txt：1个

5星 · 超过95%的资源需积分: 14 64 浏览量 2011-11-05 13:38:34 上传评论收藏 12KB RAR 举报

在VC++编程环境中，互斥量（Mutex）是一种重要的同步对象，用于控制多个线程对共享资源的访问。本文将详细介绍如何在VC++中利用互斥量创建进程，并确保它们安全地共享数据。我们需要了解互斥量的基本概念。互斥量是一个同步原语，当一个线程拥有互斥量时，其他试图获取该互斥量的线程将被阻塞，直到拥有者释放它。在多进程或多线程环境下，这可以防止多个执行单元同时访问同一资源，从而避免数据竞争和不一致性问题。要使用互斥量，你需要包含以下头文件： ```cpp #include <windows.h> ``` 接下来，你可以使用`CreateMutex`函数创建一个互斥量对象。该函数返回一个`HANDLE`类型的句柄，可用于后续的同步操作： ```cpp HANDLE hMutex = CreateMutex(NULL, FALSE, NULL); ``` 参数说明如下： - `NULL`：默认的安全属性，如果需要更复杂的权限控制，可以传递一个SECURITY_ATTRIBUTES结构体指针。 - `FALSE`：表示互斥量创建时不自动拥有，这意味着第一个调用`WaitForSingleObject`的线程将获得所有权。 - `NULL`：互斥量的名称，如果为空字符串，互斥量将只在当前进程中可见。如果需要跨进程同步，可以提供一个全局唯一的名称。当需要访问共享资源时，线程应先调用`WaitForSingleObject`来尝试获取互斥量： ```cpp if (WaitForSingleObject(hMutex, INFINITE) == WAIT_OBJECT_0) { // 拥有互斥量，现在可以访问共享资源 // ... ReleaseMutex(hMutex); // 在完成访问后释放互斥量 } else { // 无法获取互斥量，可能已被其他线程持有 // 可以选择等待或处理错误 } ``` `WAIT_OBJECT_0`表示成功获取互斥量，`INFINITE`表示无限期等待，直至获取到互斥量。如果线程在没有释放互斥量的情况下结束，操作系统会自动释放它，防止死锁。为了在进程间共享互斥量，可以在创建时提供一个全局唯一的名称，这样其他进程可以通过相同的名称获取到相同的互斥量对象。例如： ```cpp TCHAR mutexName[] = _T("Global\\MyMutexName"); hMutex = CreateMutex(NULL, FALSE, mutexName); ``` 在不同进程中的代码可以使用相同的`mutexName`来创建和访问这个互斥量。不要忘记在不再需要互斥量时关闭其句柄，使用`CloseHandle`函数： ```cpp CloseHandle(hMutex); ``` 通过以上步骤，你可以在VC++中创建使用互斥量的进程，实现线程和进程间的同步。在实际项目中，可能还需要结合其他的同步机制（如事件、信号量等）以及错误处理来构建更加健壮的多线程程序。在学习过程中，可以参考提供的源码示例进行实践，加深理解。

资源推荐

资源详情

资源评论

收起资源包目录

huzhithread.rar （13个子文件）

codefans.net

使用互斥量

ReadMe.txt 3KB

StdAfx.h 1KB

res

Demo.ico 1KB

Demo.rc2 396B

Demo.cpp 2KB

DemoDlg.cpp 7KB

Demo.h 1KB

resource.h 774B

Demo.dsp 4KB

Demo.dsw 533B

StdAfx.cpp 206B

DemoDlg.h 2KB

Demo.rc 5KB

======================================================================== MICROSOFT FOUNDATION CLASS LIBRARY : Demo ======================================================================== AppWizard has created this Demo application for you. This application not only demonstrates the basics of using the Microsoft Foundation classes but is also a starting point for writing your application. This file contains a summary of what you will find in each of the files that make up your Demo application. Demo.dsp This file (the project file) contains information at the project level and is used to build a single project or subproject. Other users can share the project (.dsp) file, but they should export the makefiles locally. Demo.h This is the main header file for the application. It includes other project specific headers (including Resource.h) and declares the CDemoApp application class. Demo.cpp This is the main application source file that contains the application class CDemoApp. Demo.rc This is a listing of all of the Microsoft Windows resources that the program uses. It includes the icons, bitmaps, and cursors that are stored in the RES subdirectory. This file can be directly edited in Microsoft Visual C++. Demo.clw This file contains information used by ClassWizard to edit existing classes or add new classes. ClassWizard also uses this file to store information needed to create and edit message maps and dialog data maps and to create prototype member functions. res\Demo.ico This is an icon file, which is used as the application's icon. This icon is included by the main resource file Demo.rc. res\Demo.rc2 This file contains resources that are not edited by Microsoft Visual C++. You should place all resources not editable by the resource editor in this file. ///////////////////////////////////////////////////////////////////////////// AppWizard creates one dialog class: DemoDlg.h, DemoDlg.cpp - the dialog These files contain your CDemoDlg class. This class defines the behavior of your application's main dialog. The dialog's template is in Demo.rc, which can be edited in Microsoft Visual C++. ///////////////////////////////////////////////////////////////////////////// Other standard files: StdAfx.h, StdAfx.cpp These files are used to build a precompiled header (PCH) file named Demo.pch and a precompiled types file named StdAfx.obj. Resource.h This is the standard header file, which defines new resource IDs. Microsoft Visual C++ reads and updates this file. ///////////////////////////////////////////////////////////////////////////// Other notes: AppWizard uses "TODO:" to indicate parts of the source code you should add to or customize. If your application uses MFC in a shared DLL, and your application is in a language other than the operating system's current language, you will need to copy the corresponding localized resources MFC42XXX.DLL from the Microsoft Visual C++ CD-ROM onto the system or system32 directory, and rename it to be MFCLOC.DLL. ("XXX" stands for the language abbreviation. For example, MFC42DEU.DLL contains resources translated to German.) If you don't do this, some of the UI elements of your application will remain in the language of the operating system. /////////////////////////////////////////////////////////////////////////////

评论收藏

内容反馈