1 // timer.cc -- helper class for time accounting
3 // Copyright 2009, 2010 Free Software Foundation, Inc.
4 // Written by Rafael Avila de Espindola <espindola@google.com>.
6 // This file is part of gold.
8 // This program is free software; you can redistribute it and/or modify
9 // it under the terms of the GNU General Public License as published by
10 // the Free Software Foundation; either version 3 of the License, or
11 // (at your option) any later version.
13 // This program is distributed in the hope that it will be useful,
14 // but WITHOUT ANY WARRANTY; without even the implied warranty of
15 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 // GNU General Public License for more details.
18 // You should have received a copy of the GNU General Public License
19 // along with this program; if not, write to the Free Software
20 // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
21 // MA 02110-1301, USA.
26 #include <sys/times.h>
29 #include "libiberty.h"
40 this->start_time_
.wall
= 0;
41 this->start_time_
.user
= 0;
42 this->start_time_
.sys
= 0;
45 // Start counting the time.
49 this->get_time(&this->start_time_
);
52 // Record the time used by pass N (0 <= N <= 2).
56 gold_assert(n
>= 0 && n
<= 2);
57 TimeStats
& thispass
= this->pass_times_
[n
];
58 this->get_time(&thispass
);
61 #if HAVE_SYSCONF && defined _SC_CLK_TCK
62 # define TICKS_PER_SECOND sysconf (_SC_CLK_TCK) /* POSIX 1003.1-1996 */
65 # define TICKS_PER_SECOND CLK_TCK /* POSIX 1003.1-1988; obsolescent */
68 # define TICKS_PER_SECOND HZ /* traditional UNIX */
70 # define TICKS_PER_SECOND 100 /* often the correct value */
75 // times returns statistics in clock_t units. This variable will hold the
76 // conversion factor to seconds. We use a variable that is initialized once
77 // because sysconf can be slow.
78 static long ticks_per_sec
;
84 ticks_per_sec
= TICKS_PER_SECOND
;
87 Timer_init timer_init
;
89 // Write the current time information.
91 Timer::get_time(TimeStats
*now
)
95 now
->wall
= (times(&t
) * 1000) / ticks_per_sec
;
96 now
->user
= (t
.tms_utime
* 1000) / ticks_per_sec
;
97 now
->sys
= (t
.tms_stime
* 1000) / ticks_per_sec
;
99 now
->wall
= get_run_time() / 1000;
105 // Return the stats since start was called.
107 Timer::get_elapsed_time()
110 this->get_time(&now
);
112 delta
.wall
= now
.wall
- this->start_time_
.wall
;
113 delta
.user
= now
.user
- this->start_time_
.user
;
114 delta
.sys
= now
.sys
- this->start_time_
.sys
;
118 // Return the stats for pass N (0 <= N <= 2).
120 Timer::get_pass_time(int n
)
122 gold_assert(n
>= 0 && n
<= 2);
123 TimeStats thispass
= this->pass_times_
[n
];
124 TimeStats
& lastpass
= n
> 0 ? this->pass_times_
[n
-1] : this->start_time_
;
125 thispass
.wall
-= lastpass
.wall
;
126 thispass
.user
-= lastpass
.user
;
127 thispass
.sys
-= lastpass
.sys
;
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