| /* |
| * ptw32_getprocessors.c |
| * |
| * Description: |
| * This translation unit implements routines which are private to |
| * the implementation and may be used throughout it. |
| * |
| * -------------------------------------------------------------------------- |
| * |
| * Pthreads-win32 - POSIX Threads Library for Win32 |
| * Copyright(C) 1998 John E. Bossom |
| * Copyright(C) 1999,2005 Pthreads-win32 contributors |
| * |
| * Contact Email: rpj@callisto.canberra.edu.au |
| * |
| * The current list of contributors is contained |
| * in the file CONTRIBUTORS included with the source |
| * code distribution. The list can also be seen at the |
| * following World Wide Web location: |
| * http://sources.redhat.com/pthreads-win32/contributors.html |
| * |
| * This library is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2 of the License, or (at your option) any later version. |
| * |
| * This library is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with this library in the file COPYING.LIB; |
| * if not, write to the Free Software Foundation, Inc., |
| * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA |
| */ |
| |
| #include "pthread.h" |
| #include "implement.h" |
| |
| |
| /* |
| * ptw32_getprocessors() |
| * |
| * Get the number of CPUs available to the process. |
| * |
| * If the available number of CPUs is 1 then pthread_spin_lock() |
| * will block rather than spin if the lock is already owned. |
| * |
| * pthread_spin_init() calls this routine when initialising |
| * a spinlock. If the number of available processors changes |
| * (after a call to SetProcessAffinityMask()) then only |
| * newly initialised spinlocks will notice. |
| */ |
| int |
| ptw32_getprocessors (int *count) |
| { |
| DWORD_PTR vProcessCPUs; |
| DWORD_PTR vSystemCPUs; |
| int result = 0; |
| |
| #if defined(NEED_PROCESS_AFFINITY_MASK) |
| |
| *count = 1; |
| |
| #else |
| |
| if (GetProcessAffinityMask (GetCurrentProcess (), |
| &vProcessCPUs, &vSystemCPUs)) |
| { |
| DWORD_PTR bit; |
| int CPUs = 0; |
| |
| for (bit = 1; bit != 0; bit <<= 1) |
| { |
| if (vProcessCPUs & bit) |
| { |
| CPUs++; |
| } |
| } |
| *count = CPUs; |
| } |
| else |
| { |
| result = EAGAIN; |
| } |
| |
| #endif |
| |
| return (result); |
| } |