Re: use pthread under winCE

[James Ewing <james dot ewing at sveasoft dot 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 -----------------------------------------------------------