source: vis_dev/cusp-1.1/src/util/cpu_time.c @ 64

Last change on this file since 64 was 12, checked in by cecile, 13 years ago

cusp added

File size: 5.5 KB
Line 
1/**CFile***********************************************************************
2
3  FileName    [ cpu_time.c ]
4
5  PackageName [ util ]
6
7  Synopsis    [ System time calls ]
8
9  Description [ The problem is that all unix systems have a different notion
10                of how fast time goes (i.e., the units returned by).  This
11                returns a consistent result. ]
12
13  Author      [ Stephen Edwards <sedwards@eecs.berkeley.edu> and others ]
14
15  Copyright   [Copyright (c) 1994-1996 The Regents of the Univ. of California.
16  All rights reserved.
17
18  Permission is hereby granted, without written agreement and without license
19  or royalty fees, to use, copy, modify, and distribute this software and its
20  documentation for any purpose, provided that the above copyright notice and
21  the following two paragraphs appear in all copies of this software.
22
23  IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY FOR
24  DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT
25  OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF THE UNIVERSITY OF
26  CALIFORNIA HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27
28  THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY WARRANTIES,
29  INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
30  FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS ON AN
31  "AS IS" BASIS, AND THE UNIVERSITY OF CALIFORNIA HAS NO OBLIGATION TO PROVIDE
32  MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.]
33
34******************************************************************************/
35
36#include "util.h"
37
38//#if HAVE_SYS_TYPES_H
39#  include<sys/types.h>
40//#endif
41
42//#if HAVE_SYS_TIMES_H
43#  include<sys/times.h>
44//#endif
45
46/**AutomaticStart*************************************************************/
47
48/*---------------------------------------------------------------------------*/
49/* Static function prototypes                                                */
50/*---------------------------------------------------------------------------*/
51
52/**AutomaticEnd***************************************************************/
53
54/**Function********************************************************************
55
56  Synopsis           [ Return elapsed time in milliseconds ]
57
58  Description        [ Return a long which represents the elapsed time in
59                       milliseconds since some constant reference. <P>
60
61                       There are two possibilities:
62                       <OL>
63                       <LI> The system is non-POSIX compliant, so unistd.h
64                            and hence sysconf() can't tell us the clock tick
65                            speed.  At this point, we have to resort to
66                            using the user-settable CLOCK_RESOLUTION definition
67                            to get the right speed
68                       <LI> The system is POSIX-compliant.  unistd.h gives
69                            us sysconf(), which tells us the clock rate.
70                       </OL>
71 ]
72
73  SideEffects        [ none ]
74
75******************************************************************************/
76long 
77util_cpu_time(void)
78{
79    long t = 0;
80
81#if HAVE_SYSCONF == 1
82
83    /* Code for POSIX systems */
84
85    struct tms buffer;
86    long nticks;                /* number of clock ticks per second */
87
88    nticks = sysconf(_SC_CLK_TCK);
89    times(&buffer);
90    t = (long) (buffer.tms_utime * (1000.0/nticks));
91
92#else
93#  ifndef vms
94
95    /* Code for non-POSIX systems */
96
97    struct tms buffer;
98
99    time(&buffer);
100    t = buffer.tms_utime * 1000.0 / CLOCK_RESOLUTION;
101
102#  else
103
104    /* Code for VMS (?) */
105
106    struct {int p1, p2, p3, p4;} buffer;
107    static long ref_time;
108    times(&buffer);
109    t = buffer.p1 * 10;
110    if (ref_time == 0)
111      ref_time = t;
112    t = t - ref_time;
113
114#  endif /* vms */
115#endif /* _POSIX_VERSION */
116
117    return t;
118}
119
120/**Function********************************************************************
121
122  Synopsis           [ Return elapsed time in milliseconds. It includes waited-
123                       for terminated children. ]
124
125  Description        [ Return a long which represents the elapsed time in
126                       milliseconds since some constant reference. This time
127                       includes the CPU time spent executing instructions of
128                       the calling process and the time this process waited
129                       for its children to be terminated<P>
130
131                       There are two possibilities:
132                       <OL>
133                       <LI> The system is non-POSIX compliant, so unistd.h
134                            and hence sysconf() can't tell us the clock tick
135                            speed.  At this point, we have to resort to
136                            using the user-settable CLOCK_RESOLUTION definition
137                            to get the right speed
138                       <LI> The system is POSIX-compliant.  unistd.h gives
139                            us sysconf(), which tells us the clock rate.
140                       </OL>
141 ]
142
143  SideEffects        [ none ]
144
145******************************************************************************/
146long 
147util_cpu_ctime(void)
148{
149    long t = 0;
150
151#if HAVE_SYSCONF == 1
152
153    /* Code for POSIX systems */
154
155    struct tms buffer;
156    long nticks;                /* number of clock ticks per second */
157
158    nticks = sysconf(_SC_CLK_TCK);
159    times(&buffer);
160    t = (long) ((buffer.tms_utime + buffer.tms_cutime) * (1000.0/nticks));
161
162#else
163#  ifndef vms
164
165    /* Code for non-POSIX systems */
166
167    struct tms buffer;
168
169    time(&buffer);
170    t = (buffer.tms_utime + buffer.tms_cutime) * 1000.0 / CLOCK_RESOLUTION;
171
172#  else
173
174    /* Code for VMS (?) */
175
176    struct {int p1, p2, p3, p4;} buffer;
177    static long ref_time;
178    times(&buffer);
179    t = (buffer.p1 + buffer.p3) * 10;
180    if (ref_time == 0)
181      ref_time = t;
182    t = t - ref_time;
183
184#  endif /* vms */
185#endif /* _POSIX_VERSION */
186
187    return t;
188}
189
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