91 lines
2.5 KiB
C
91 lines
2.5 KiB
C
/*
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* ptw32_getprocessors.c
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*
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* Description:
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* This translation unit implements routines which are private to
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* the implementation and may be used throughout it.
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*
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* --------------------------------------------------------------------------
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*
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* Pthreads-win32 - POSIX Threads Library for Win32
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* Copyright(C) 1998 John E. Bossom
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* Copyright(C) 1999,2005 Pthreads-win32 contributors
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*
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* Contact Email: rpj@callisto.canberra.edu.au
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*
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* The current list of contributors is contained
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* in the file CONTRIBUTORS included with the source
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* code distribution. The list can also be seen at the
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* following World Wide Web location:
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* http://sources.redhat.com/pthreads-win32/contributors.html
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library in the file COPYING.LIB;
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* if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
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*/
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#include "pthread.h"
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#include "implement.h"
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/*
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* ptw32_getprocessors()
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*
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* Get the number of CPUs available to the process.
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*
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* If the available number of CPUs is 1 then pthread_spin_lock()
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* will block rather than spin if the lock is already owned.
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*
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* pthread_spin_init() calls this routine when initialising
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* a spinlock. If the number of available processors changes
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* (after a call to SetProcessAffinityMask()) then only
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* newly initialised spinlocks will notice.
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*/
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int
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ptw32_getprocessors (int *count)
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{
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DWORD_PTR vProcessCPUs;
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DWORD_PTR vSystemCPUs;
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int result = 0;
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#if defined(NEED_PROCESS_AFFINITY_MASK)
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*count = 1;
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#else
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if (GetProcessAffinityMask (GetCurrentProcess (),
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&vProcessCPUs, &vSystemCPUs))
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{
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DWORD_PTR bit;
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int CPUs = 0;
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for (bit = 1; bit != 0; bit <<= 1)
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{
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if (vProcessCPUs & bit)
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{
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CPUs++;
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}
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}
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*count = CPUs;
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}
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else
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{
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result = EAGAIN;
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}
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#endif
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return (result);
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}
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