Back to index

cell-binutils  2.17cvs20070401
hertz.c
Go to the documentation of this file.
00001 /*
00002  * Copyright (c) 1983, 1993
00003  *      The Regents of the University of California.  All rights reserved.
00004  *
00005  * Redistribution and use in source and binary forms, with or without
00006  * modification, are permitted provided that the following conditions
00007  * are met:
00008  * 1. Redistributions of source code must retain the above copyright
00009  *    notice, this list of conditions and the following disclaimer.
00010  * 2. Redistributions in binary form must reproduce the above copyright
00011  *    notice, this list of conditions and the following disclaimer in the
00012  *    documentation and/or other materials provided with the distribution.
00013  * 3. Neither the name of the University nor the names of its contributors
00014  *    may be used to endorse or promote products derived from this software
00015  *    without specific prior written permission.
00016  *
00017  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
00018  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
00019  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
00020  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
00021  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
00022  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
00023  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
00024  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
00025  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
00026  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
00027  * SUCH DAMAGE.
00028  */
00029 #include "gprof.h"
00030 #include "hertz.h"
00031 
00032 
00033 int
00034 hertz ()
00035 {
00036 #ifdef HERTZ
00037   return HERTZ;
00038 #else /* ! defined (HERTZ) */
00039 #ifdef HAVE_SETITIMER
00040   struct itimerval tim;
00041 
00042   tim.it_interval.tv_sec = 0;
00043   tim.it_interval.tv_usec = 1;
00044   tim.it_value.tv_sec = 0;
00045   tim.it_value.tv_usec = 0;
00046   setitimer (ITIMER_REAL, &tim, 0);
00047   setitimer (ITIMER_REAL, 0, &tim);
00048   if (tim.it_interval.tv_usec >= 2)
00049     {
00050       return 1000000 / tim.it_interval.tv_usec;
00051     }
00052 #endif /* ! defined (HAVE_SETITIMER) */
00053 #if defined (HAVE_SYSCONF) && defined (_SC_CLK_TCK)
00054   return sysconf (_SC_CLK_TCK);
00055 #else /* ! defined (HAVE_SYSCONF) || ! defined (_SC_CLK_TCK) */
00056 #ifdef __MSDOS__
00057   return 18;
00058 #else  /* ! defined (__MSDOS__) */
00059   return HZ_WRONG;
00060 #endif /* ! defined (__MSDOS__) */
00061 #endif /* ! defined (HAVE_SYSCONF) || ! defined (_SC_CLK_TCK) */
00062 #endif /* ! defined (HERTZ) */
00063 }