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SetThreadAffinityMask info  Overview  Group

The SetThreadAffinityMask function sets a processor affinity mask for a specified thread.

A thread affinity mask is a bit vector in which each bit represents the processors that a thread is allowed to run on.

A thread affinity mask must be a proper subset of the process affinity mask for the containing process of a thread. A thread is only allowed to run on the processors its process is allowed to run on.

DWORD SetThreadAffinityMask (

    HANDLE hThread,

// handle to the thread of interest

    DWORD dwThreadAffinityMask

// a thread affinity mask

   );

Parameters

hThread
A handle to the thread whose affinity mask the function sets.

Windows NT: This handle must have the THREAD_SET_INFORMATION access right associated with it. For more information, see Thread Objects.

dwThreadAffinityMask
Windows 95: This value must be 1.

Windows NT: Specifies an affinity mask for the thread.

Return Values

If the function succeeds, the return value is nonzero.

Windows 95: The return value is 1. To succeed, hThread must be valid and dwThreadAffinityMask must be 1.

Windows NT: The return value is the threadís previous affinity mask.

If the function fails, the return value is zero. To get extended error information, call GetLastError.

See Also

GetProcessAffinityMask, SetThreadIdealProcessor

See also:


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