Arguments:
Windows only.
The processor affinity in Windows is a number which specifies the number of processors (i.e. chips) that will be used by the running process. In Allegro CL 5.0.x, the best affinity is 1 and there are known problems with higher affinities. The startup code on Windows sets the affinity to 1.
T his function is defined on Windows versions only. On Unix versions, the symbols exist but have no function definitions. It uses a MicroSoft routine which is documented as working on Windows 95/98/NT/2000.
On Windows, return the current process' processor affinity mask (a number). It does this by calling GetProcessorAffinityMask(), and an error is signaled if this routine returns an error (0).
(setf sys:processor-affinity-mask)
On 95/98, this function has no effect.
On NT/2000, the setf value is the new processor affinity mask--see the Microsoft documentation on SetProcessorAffinityMask(). Our startup code sets the mask to 1 (see the (internal) function start-lisp-execution defined in [Allegro directory]/src/aclstart.cl). An error is signalled if the call to SetProcessorAffinityMask() fails.
The documentation is described in introduction.htm and the index is in index.htm.
Copyright (c) 1998-2000, Franz Inc. Berkeley, CA., USA. All rights reserved.
Created 2000.10.5.