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updated MFC multithreading topics a bit
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‎docs/c-language/thread-local-storage.md‎

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# Thread Local Storage
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**Microsoft Specific**
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Thread Local Storage (TLS) is the mechanism by which each thread in a given multithreaded process allocates storage for thread-specific data. In standard multithreaded programs, data is shared among all threads of a given process, whereas thread local storage is the mechanism for allocating per-thread data. For a complete discussion of threads, see [Processes and Threads](http://msdn.microsoft.com/library/windows/desktop/ms684841) in the Windows SDK.
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Thread Local Storage (TLS) is the mechanism by which each thread in a given multithreaded process allocates storage for thread-specific data. In standard multithreaded programs, data is shared among all threads of a given process, whereas thread local storage is the mechanism for allocating per-thread data. For a complete discussion of threads, see [Processes and Threads](/windows/desktop/ProcThread/processes-and-threads) in the Windows SDK.
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The Microsoft C language includes the extended storage-class attribute, thread, which is used with the __declspec keyword to declare a thread local variable. For example, the following code declares an integer thread local variable and initializes it with a value:
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‎docs/mfc/tn064-apartment-model-threading-in-activex-controls.md‎

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However, different instances of the same type of control may be assigned to different apartments. So, if multiple instances of a control share any data in common (for example, static or global data), then access to this shared data will need to be protected by a synchronization object, such as a critical section.
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For complete details on the apartment threading model, please see [Processes and Threads](http://msdn.microsoft.com/library/windows/desktop/ms684841) in the *OLE Programmer's Reference*.
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For complete details on the apartment threading model, please see [Processes and Threads](/windows/desktop/ProcThread/processes-and-threads) in the *OLE Programmer's Reference*.
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## Why Support Apartment-Model Threading
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Controls that support apartment-model threading can be used in multithreaded container applications that also support the apartment model. If you do not enable apartment-model threading, you will limit the potential set of containers in which your control could be used.

‎docs/parallel/avoiding-problem-areas-with-multithread-programs.md‎

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ms.workload: ["cplusplus"]
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---
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# Avoiding Problem Areas with Multithread Programs
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There are several problems you might encounter in creating, linking, or executing a multithread C program. Some of the more common problems are described in the following table. (For a similar discussion from the MFC point of view, see [Multithreading: Programming Tips](../parallel/multithreading-programming-tips.md).)
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There are several problems you might encounter in creating, linking, or executing a multithread C program. Some of the more common problems are described in the following table. (For a similar discussion from the MFC point of view, see [Multithreading: Programming Tips](multithreading-programming-tips.md).)
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|Problem|Probable cause|
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|-------------|--------------------|
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## See Also
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[Multithreading with C and Win32](../parallel/multithreading-with-c-and-win32.md)
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[Multithreading with C and Win32](multithreading-with-c-and-win32.md)

‎docs/parallel/c-run-time-library-functions-for-thread-control.md‎

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## See Also
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[Multithreading with C and Win32](../parallel/multithreading-with-c-and-win32.md)
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[Multithreading with C and Win32](multithreading-with-c-and-win32.md)

‎docs/parallel/compiling-and-linking-multithread-programs.md‎

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ms.workload: ["cplusplus"]
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# Compiling and Linking Multithread Programs
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The Bounce.c program is introduced in [Sample Multithread C Program](../parallel/sample-multithread-c-program.md).
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The Bounce.c program is introduced in [Sample Multithread C Program](sample-multithread-c-program.md).
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Programs are compiled multithreaded by default.
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## See Also
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[Multithreading with C and Win32](../parallel/multithreading-with-c-and-win32.md)
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[Multithreading with C and Win32](multithreading-with-c-and-win32.md)

‎docs/parallel/include-files-for-multithreading.md‎

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## See Also
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[Multithreading with C and Win32](../parallel/multithreading-with-c-and-win32.md)
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[Multithreading with C and Win32](multithreading-with-c-and-win32.md)

‎docs/parallel/library-support-for-multithreading.md‎

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## See Also
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[Multithreading with C and Win32](../parallel/multithreading-with-c-and-win32.md)
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[Multithreading with C and Win32](multithreading-with-c-and-win32.md)

‎docs/parallel/multithread-programs.md‎

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A process consists of one or more threads and the code, data, and other resources of a program in memory. Typical program resources are open files, semaphores, and dynamically allocated memory. A program executes when the system scheduler gives one of its threads execution control. The scheduler determines which threads should run and when they should run. Threads of lower priority might have to wait while higher priority threads complete their tasks. On multiprocessor machines, the scheduler can move individual threads to different processors to balance the CPU load.
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Each thread in a process operates independently. Unless you make them visible to each other, the threads execute individually and are unaware of the other threads in a process. Threads sharing common resources, however, must coordinate their work by using semaphores or another method of interprocess communication. For more information about synchronizing threads, see [Writing a Multithreaded Win32 Program](../parallel/writing-a-multithreaded-win32-program.md).
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Each thread in a process operates independently. Unless you make them visible to each other, the threads execute individually and are unaware of the other threads in a process. Threads sharing common resources, however, must coordinate their work by using semaphores or another method of interprocess communication. For more information about synchronizing threads, see [Writing a Multithreaded Win32 Program](writing-a-multithreaded-win32-program.md).
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## See Also
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[Multithreading with C and Win32](../parallel/multithreading-with-c-and-win32.md)
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[Multithreading with C and Win32](multithreading-with-c-and-win32.md)

‎docs/parallel/multithreading-and-locales.md‎

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## See Also
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[Multithreading Support for Older Code (Visual C++)](../parallel/multithreading-support-for-older-code-visual-cpp.md)
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[Multithreading Support for Older Code (Visual C++)](multithreading-support-for-older-code-visual-cpp.md)
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[_beginthread, _beginthreadex](../c-runtime-library/reference/beginthread-beginthreadex.md)
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[_configthreadlocale](../c-runtime-library/reference/configthreadlocale.md)
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[setlocale](../preprocessor/setlocale.md)

‎docs/parallel/multithreading-creating-user-interface-threads.md‎

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title: "Multithreading: Creating User-Interface Threads | Microsoft Docs"
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title: "Multithreading: Creating MFC User-Interface Threads | Microsoft Docs"
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ms.custom: ""
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ms.date: "11/04/2016"
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ms.date: "08/27/2018"
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ms.technology: ["cpp-parallel"]
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ms.topic: "conceptual"
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f1_keywords: ["CREATE_SUSPENDED", "SECURITY_ATTRIBUTES"]
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# Multithreading: Creating User-Interface Threads
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# Multithreading: Creating MFC User-Interface Threads
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A user-interface thread is commonly used to handle user input and respond to user events independently of threads executing other portions of the application. The main application thread (provided in your `CWinApp`-derived class) is already created and started for you. This topic describes the steps necessary to create additional user-interface threads.
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The first thing you must do when creating a user-interface thread is derive a class from [CWinThread](../mfc/reference/cwinthread-class.md). You must declare and implement this class, using the [DECLARE_DYNCREATE](../mfc/reference/run-time-object-model-services.md#declare_dyncreate) and [IMPLEMENT_DYNCREATE](../mfc/reference/run-time-object-model-services.md#implement_dyncreate) macros. This class must override some functions and can override others. These functions and what they should do are presented in the following table.
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|Function|Purpose|
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|[ExitInstance](../mfc/reference/cwinthread-class.md#exitinstance)|Perform cleanup when thread terminates. Usually overridden.|
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|[InitInstance](../mfc/reference/cwinthread-class.md#initinstance)|Perform thread instance initialization. Must be overridden.|
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|[OnIdle](../mfc/reference/cwinthread-class.md#onidle)|Perform thread-specific idle-time processing. Not usually overridden.|
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## What do you want to know more about?
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- [Multithreading: Terminating Threads](../parallel/multithreading-terminating-threads.md)
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- [Multithreading: Terminating Threads](multithreading-terminating-threads.md)
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- [Multithreading: Creating Worker Threads](../parallel/multithreading-creating-worker-threads.md)
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- [Multithreading: Creating Worker Threads](multithreading-creating-worker-threads.md)
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- [Processes and Threads](http://msdn.microsoft.com/library/windows/desktop/ms684841)
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- [Processes and Threads](/windows/desktop/ProcThread/processes-and-threads)
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## See Also
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[Multithreading with C++ and MFC](../parallel/multithreading-with-cpp-and-mfc.md)
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[Multithreading with C++ and MFC](multithreading-with-cpp-and-mfc.md)

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