1*75fd0b74Schristos /*
2*75fd0b74Schristos * Copyright (c) 1983, 1993
3*75fd0b74Schristos * The Regents of the University of California. All rights reserved.
4*75fd0b74Schristos *
5*75fd0b74Schristos * Redistribution and use in source and binary forms, with or without
6*75fd0b74Schristos * modification, are permitted provided that the following conditions
7*75fd0b74Schristos * are met:
8*75fd0b74Schristos * 1. Redistributions of source code must retain the above copyright
9*75fd0b74Schristos * notice, this list of conditions and the following disclaimer.
10*75fd0b74Schristos * 2. Redistributions in binary form must reproduce the above copyright
11*75fd0b74Schristos * notice, this list of conditions and the following disclaimer in the
12*75fd0b74Schristos * documentation and/or other materials provided with the distribution.
13*75fd0b74Schristos * 3. Neither the name of the University nor the names of its contributors
14*75fd0b74Schristos * may be used to endorse or promote products derived from this software
15*75fd0b74Schristos * without specific prior written permission.
16*75fd0b74Schristos *
17*75fd0b74Schristos * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18*75fd0b74Schristos * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19*75fd0b74Schristos * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20*75fd0b74Schristos * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21*75fd0b74Schristos * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22*75fd0b74Schristos * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23*75fd0b74Schristos * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24*75fd0b74Schristos * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25*75fd0b74Schristos * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26*75fd0b74Schristos * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27*75fd0b74Schristos * SUCH DAMAGE.
28*75fd0b74Schristos */
29*75fd0b74Schristos #include "gprof.h"
30*75fd0b74Schristos #include "hertz.h"
31*75fd0b74Schristos
32*75fd0b74Schristos
33*75fd0b74Schristos int
hertz(void)34*75fd0b74Schristos hertz (void)
35*75fd0b74Schristos {
36*75fd0b74Schristos #ifdef HERTZ
37*75fd0b74Schristos return HERTZ;
38*75fd0b74Schristos #else /* ! defined (HERTZ) */
39*75fd0b74Schristos #ifdef HAVE_SETITIMER
40*75fd0b74Schristos struct itimerval tim;
41*75fd0b74Schristos
42*75fd0b74Schristos tim.it_interval.tv_sec = 0;
43*75fd0b74Schristos tim.it_interval.tv_usec = 1;
44*75fd0b74Schristos tim.it_value.tv_sec = 0;
45*75fd0b74Schristos tim.it_value.tv_usec = 0;
46*75fd0b74Schristos setitimer (ITIMER_REAL, &tim, 0);
47*75fd0b74Schristos setitimer (ITIMER_REAL, 0, &tim);
48*75fd0b74Schristos if (tim.it_interval.tv_usec >= 2)
49*75fd0b74Schristos {
50*75fd0b74Schristos return 1000000 / tim.it_interval.tv_usec;
51*75fd0b74Schristos }
52*75fd0b74Schristos #endif /* ! defined (HAVE_SETITIMER) */
53*75fd0b74Schristos #if defined (HAVE_SYSCONF) && defined (_SC_CLK_TCK)
54*75fd0b74Schristos return sysconf (_SC_CLK_TCK);
55*75fd0b74Schristos #else /* ! defined (HAVE_SYSCONF) || ! defined (_SC_CLK_TCK) */
56*75fd0b74Schristos #ifdef __MSDOS__
57*75fd0b74Schristos return 18;
58*75fd0b74Schristos #else /* ! defined (__MSDOS__) */
59*75fd0b74Schristos return HZ_WRONG;
60*75fd0b74Schristos #endif /* ! defined (__MSDOS__) */
61*75fd0b74Schristos #endif /* ! defined (HAVE_SYSCONF) || ! defined (_SC_CLK_TCK) */
62*75fd0b74Schristos #endif /* ! defined (HERTZ) */
63*75fd0b74Schristos }
64