On Dec 18, 2005, at 5:45 PM, Ivan S. Kourtev wrote:
First, I tried sysconf() but it doesn't seem capable of doing what I
need under Mac OS? The two variables
_SC_NPROCESSORS_CONF and _SC_NPROCESSORS_ONLN are undefined in
unistd.h -- am I missing something?
They don't seem to be defined on Mac OS X. I'd suggest filing a bug
report with Apple (<http://bugreport.apple.com>) if you'd like to see
them added.
I also looked into sysctl as per Daniel's and Eric's suggestions -- I
noticed even the sysconf manpage suggests that the sysctl interface is
much richer. On Mac OS X, I got some code working right away
(attached at end) but I haven't figured out how to get it to go under
redhat (everything I do must work under both Mac OS X and redhat at
least). redhat has a sys/sysctl.h but it only contains the
declaration of sysctl() and none of the keywords. I realize this may
be a little off-topic, but any clues?
This sounds like a great job for a configure script. This is hardly
the only difference between Mac OS X and Linux. :) Another alternative
is to do something like
#ifdef HW_NCPU
...do the sysctl thing...
#elif defined(_SC_NPROCESSORS_CONF)
...do the sysconf thing...
#else
#error Uh oh.
#endif
By the way, in the code below, what are the HW_ keywords (if any) that
correspond to the commented out entries in the data[] array? I really
only need HW_NCPU and HW_AVAILCPU for now but just out of curiosity?
Not all sysctl entries have numeric items to go along with their names.
Sometimes you just have to use sysctlbyname.
Hope this helps,
Eric
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