mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-14 01:00:07 +00:00
56 lines
2.2 KiB
C
56 lines
2.2 KiB
C
/* Return frequency of ticks reported by profil. Generic version. */
|
|
/*-
|
|
* Copyright (c) 1983, 1992, 1993
|
|
* The Regents of the University of California. All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 4. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
|
|
|
|
#include <sys/types.h>
|
|
#include <sys/time.h>
|
|
#include <libc-internal.h>
|
|
|
|
int
|
|
__profile_frequency (void)
|
|
{
|
|
/*
|
|
* Discover the tick frequency of the machine if something goes wrong,
|
|
* we return 0, an impossible hertz.
|
|
*/
|
|
struct itimerval tim;
|
|
|
|
tim.it_interval.tv_sec = 0;
|
|
tim.it_interval.tv_usec = 1;
|
|
tim.it_value.tv_sec = 0;
|
|
tim.it_value.tv_usec = 0;
|
|
__setitimer(ITIMER_REAL, &tim, 0);
|
|
__setitimer(ITIMER_REAL, 0, &tim);
|
|
if (tim.it_interval.tv_usec < 2)
|
|
return 0;
|
|
return (1000000 / tim.it_interval.tv_usec);
|
|
}
|
|
libc_hidden_def (__profile_frequency)
|