source: vis_dev/cusp-1.1/src/util/cpu_time.c@ 93

Last change on this file since 93 was 12, checked in by cecile, 15 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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