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julius |
/*
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* Copyright (c) 1983, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include "gprof.h"
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#include "hertz.h"
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int
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hertz ()
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{
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#ifdef HERTZ
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return HERTZ;
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#else /* ! defined (HERTZ) */
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#ifdef HAVE_SETITIMER
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struct itimerval tim;
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tim.it_interval.tv_sec = 0;
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tim.it_interval.tv_usec = 1;
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tim.it_value.tv_sec = 0;
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tim.it_value.tv_usec = 0;
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setitimer (ITIMER_REAL, &tim, 0);
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setitimer (ITIMER_REAL, 0, &tim);
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if (tim.it_interval.tv_usec >= 2)
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{
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return 1000000 / tim.it_interval.tv_usec;
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}
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#endif /* ! defined (HAVE_SETITIMER) */
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#if defined (HAVE_SYSCONF) && defined (_SC_CLK_TCK)
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return sysconf (_SC_CLK_TCK);
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#else /* ! defined (HAVE_SYSCONF) || ! defined (_SC_CLK_TCK) */
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#ifdef __MSDOS__
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return 18;
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#else /* ! defined (__MSDOS__) */
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return HZ_WRONG;
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#endif /* ! defined (__MSDOS__) */
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#endif /* ! defined (HAVE_SYSCONF) || ! defined (_SC_CLK_TCK) */
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#endif /* ! defined (HERTZ) */
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}
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