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Detect the number of CPUs available.

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Now qfvis will default to multi-threaded on multi-core machines.
This commit is contained in:
Bill Currie 2013-03-19 12:05:50 +09:00
parent 88e5adcec6
commit dff0b89a6c
1 changed files with 23 additions and 1 deletions
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24
tools/qfvis/source/options.c
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@ -37,10 +37,12 @@
#include <stdlib.h>
#include <stdio.h>
#include <getopt.h>
#include <unistd.h>
#include "QF/dstring.h"
#include "options.h"
#include "vis.h"
const char *this_program;
@ -86,6 +88,20 @@ usage (int status)
exit (status);
}
static int
default_threads (void)
{
int threads = 1;
#ifdef USE_PTHREADS
# ifdef _SC_NPROCESSORS_ONLN
threads = sysconf(_SC_NPROCESSORS_ONLN);
if (threads < 1)
threads = 1;
# endif
#endif
return threads;
}
int
DecodeArgs (int argc, char **argv)
{
@ -93,7 +109,7 @@ DecodeArgs (int argc, char **argv)
options.verbosity = 0;
options.bspfile = NULL;
options.threads = 1;
options.threads = default_threads ();
options.level = 4;
while ((c = getopt_long (argc, argv, short_options, long_options, 0))
@ -128,6 +144,12 @@ DecodeArgs (int argc, char **argv)
usage (1);
}
}
#ifndef USE_PTHREADS
if (options.threads != 1) {
printf ("NOTE: ignoring thread count (unsupported)\n");
options.threads = 1;
}
#endif
if ((!options.bspfile) && argv[optind] && *(argv[optind]))
options.bspfile = dstring_strdup (argv[optind++]);