Re: use pthread under winCE

[James Ewing <james.ewing@sveasoft.com>]

Hi Benoit,

I've attached my modifications to the ptw32_getprocessors.c file that 
fixes the GetProcessAffinityMask for WINCE. It just forces the processor 
count to one.

I looked in the pthread.h file and found that if you don't have _UWIN 
defined, pthreads own internal _errno will be used. Make sure _UWIN is 
*not* defined. See line 1143 in pthread.h.

It was many moons ago that I tweaked pthreads for WIN32 for WINCE and 
I've forgotten much of what needed to be done. If anyone wants a diff of 
my build against the current CVS version just let me know and I'll send 
it out. It might be a good idea to test it a bit and then merge it into 
the main CVS tree. I use the same source for both WIN32 and WINCE 
pthreads builds.

Best,

James


[ ptw32_getprocessors.c]
----------------------------------------------------------------------
/*
 * 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;

#ifndef WINCE
  DWORD vProcessCPUs;
  DWORD vSystemCPUs;

  if (GetProcessAffinityMask(GetCurrentProcess(),
                 &vProcessCPUs,
                 &vSystemCPUs))
    {
      DWORD bit;
      int CPUs = 0;

      for (bit = 1; bit != 0; bit <<= 1)
    {
      if (vProcessCPUs & bit)
        {
          CPUs++;
        }
    }
      *count = CPUs;
    }
  else
    {
      result = EAGAIN;
    }
#else
  *count = 1;
#endif
  return(result);
// end of file -----------------------------------------------------------