DisableThreadLibraryCalls

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Windows Embedded CE 6.0 R3

4/8/2010

This function disables the DLL_THREAD_ATTACH and DLL_THREAD_DETACH notifications for the DLL specified by the hLibModule parameter.

Using this function can reduce the size of the working code set for some applications.

Syntax

BOOL DisableThreadLibraryCalls(
  HMODULE hLibModule
);

Parameters

• hLibModule
  [in] Handle to the DLL module for which the DLL_THREAD_ATTACH and DLL_THREAD_DETACH notifications are to be disabled.

Return Value

Nonzero indicates success. Zero indicates failure. To get extended error information, call GetLastError.

Remarks

Windows Embedded CE does not support static-thread local storage; therefore, the only restriction for specifying a DLL to disable is that it is a valid module.

The DisableThreadLibraryCalls function lets a DLL disable the DLL_THREAD_ATTACH and DLL_THREAD_DETACH notification calls.

This can be a useful optimization for multithreaded applications that have many DLLs, frequently create and delete threads, and whose DLLs do not need these thread-level notifications of attachment/detachment.

By disabling the notifications, the DLL initialization code is not paged-in because a thread is created or deleted, which reduces the size of the application's working code set.

Disabling the notification calls can be used for any DLL where there is no thread-level tracking required. If you need to track resources on a thread-by-thread basis, the notification should not be turned off.

To implement the optimization, modify a DLL's DLL_PROCESS_ATTACH code to call DisableThreadLibraryCalls.

Drivers that exist in the Device Manager Device.exe process space should call DisableThreadLibraryCalls if no thread-specific data is needed.

Requirements

See Also

Reference

DLL Functions