javasetprocessaffinitymask_SetThreadAffinityMask详解|学步园

MSDN上的描述&＃xff1a;

SetThreadAffinityMask

TheSetThreadAffinityMaskfunction sets a processor affinity mask for the specified thread.

DWORD_PTR SetThreadAffinityMask(

HANDLE , DWORD_PTR );

Parameters

hThread

[in] Handle to the thread whose affinity mask is to be set.

This handle must have the THREAD_SET_INFORMATION and THREAD_QUERY_INFORMATION access rights. For more information, seeThread Security and Access Rights.

dwThreadAffinityMask

[in] Affinity mask for the thread.

Windows Me/98/95:This value must be 1.

Return Values

If the function succeeds, the return value is the thread&＃39;s previous affinity mask.

Windows Me/98/95:The return value is 1. To succeed,hThreadmust be valid anddwThreadAffinityMaskmust be 1.

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

Remarks

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.

通过调用SetThreadAffinityMask&＃xff0c;就能为各个线程设置亲缘性屏蔽&＃xff1a;

DWORD_PTR SetThreadAffinityMask(HANDLE hThread, DWORD_PTR dwThreadAffinityMask);

该函数中的h T h r e a d参数用于指明要限制哪个线程&＃xff0c; dwThreadAffinityMask用于指明该线程能够在哪个CPU上运行。dwThreadAffinityMask必须是进程的亲缘性屏蔽的相应子集。返回值是线程的前一个亲缘性屏蔽。

因此&＃xff0c;若要将3个线程限制到CPU1、2和3上去运行&＃xff0c;可以这样操作&＃xff1a;

//Thread 0 can only run on CPU 0.

SetThreadAffinityMask(hThread0, 0x00000001); //第0位是1

//Threads 1, 2, 3 run on CPUs 1, 2, 3.//第1 2 3位是1

SetThreadAffinityMask(hThread1, 0x0000000E);

SetThreadAffinityMask(hThread2, 0x0000000E);

SetThreadAffinityMask(hThread3, 0x0000000E);