The DisableThreadLibraryCalls function disables the DLL_THREAD_ATTACH and DLL_THREAD_DETACH notifications for the dynamic-link library (DLL) specified by hLibModule. This can reduce the size of the working code set for some applications.
// dynamic-link library for which calls are to be disabled
If the function succeeds, the return value is nonzero.
If the function fails, the return value is zero. The DisableThreadLibraryCalls function fails if the DLL specified by hLibModule has active static thread local storage, or if hLibModule is an invalid module handle. To get extended error information, call GetLastError.
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. A remote procedure call (RPC) server application is an example of such an application. In these sorts of applications, DLL initialization routines often remain in memory to service DLL_THREAD_ATTACH and DLL_THREAD_DETACH notifications. By disabling the notifications, the DLL initialization code is not paged in because a thread is created or deleted, thus reducing the size of the applicationís working code set. To implement the optimization, modify a DLLís DLL_PROCESS_ATTACH code to call DisableThreadLibraryCalls.
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