text: /*
   * 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)
  {
    int result = 0;
  
  #if defined(NEED_PROCESS_AFFINITY_MASK)
  
    *count = 1;
  
  #else
  
    DWORD_PTR vProcessCPUs;
    DWORD_PTR vSystemCPUs;
  
    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);
  }
  