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Optimize the handling of SC_NPROCESSORS_CONF, by using auxv AT_NCPU

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value if present.

MFC after:	1 week
This commit is contained in:
Konstantin Belousov 2012-06-27 20:32:45 +00:00
parent a33cb5feab
commit a87855124c
1 changed files with 4 additions and 0 deletions
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4
lib/libc/gen/sysconf.c
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@ -42,6 +42,7 @@ __FBSDID("$FreeBSD$");
#include <sys/resource.h>
#include <sys/socket.h>
#include <elf.h>
#include <errno.h>
#include <limits.h>
#include <paths.h>
@ -51,6 +52,7 @@ __FBSDID("$FreeBSD$");
#include "../stdlib/atexit.h"
#include "tzfile.h" /* from ../../../contrib/tzcode/stdtime */
#include "libc_private.h"
#define _PATH_ZONEINFO TZDIR /* from tzfile.h */
@ -585,6 +587,8 @@ yesno:
case _SC_NPROCESSORS_CONF:
case _SC_NPROCESSORS_ONLN:
if (_elf_aux_info(AT_NCPUS, &value, sizeof(value)) == 0)
return ((long)value);
mib[0] = CTL_HW;
mib[1] = HW_NCPU;
break;