1 // timer.cc -- helper class for time accounting
3 // Copyright (C) 2009-2017 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.
28 #include <sys/times.h>
31 #include "libiberty.h"
42 this->start_time_
.wall
= 0;
43 this->start_time_
.user
= 0;
44 this->start_time_
.sys
= 0;
47 // Start counting the time.
51 this->get_time(&this->start_time_
);
54 // Record the time used by pass N (0 <= N <= 2).
58 gold_assert(n
>= 0 && n
<= 2);
59 TimeStats
& thispass
= this->pass_times_
[n
];
60 this->get_time(&thispass
);
63 #if HAVE_SYSCONF && defined _SC_CLK_TCK
64 # define TICKS_PER_SECOND sysconf (_SC_CLK_TCK) /* POSIX 1003.1-1996 */
67 # define TICKS_PER_SECOND CLK_TCK /* POSIX 1003.1-1988; obsolescent */
70 # define TICKS_PER_SECOND HZ /* traditional UNIX */
72 # define TICKS_PER_SECOND 100 /* often the correct value */
77 // times returns statistics in clock_t units. This variable will hold the
78 // conversion factor to seconds. We use a variable that is initialized once
79 // because sysconf can be slow.
80 static long ticks_per_sec
;
86 ticks_per_sec
= TICKS_PER_SECOND
;
89 Timer_init timer_init
;
91 // Write the current time information.
93 Timer::get_time(TimeStats
*now
)
97 now
->wall
= (times(&t
) * 1000) / ticks_per_sec
;
98 now
->user
= (t
.tms_utime
* 1000) / ticks_per_sec
;
99 now
->sys
= (t
.tms_stime
* 1000) / ticks_per_sec
;
101 now
->wall
= get_run_time() / 1000;
107 // Return the stats since start was called.
109 Timer::get_elapsed_time()
112 this->get_time(&now
);
114 delta
.wall
= now
.wall
- this->start_time_
.wall
;
115 delta
.user
= now
.user
- this->start_time_
.user
;
116 delta
.sys
= now
.sys
- this->start_time_
.sys
;
120 // Return the stats for pass N (0 <= N <= 2).
122 Timer::get_pass_time(int n
)
124 gold_assert(n
>= 0 && n
<= 2);
125 TimeStats thispass
= this->pass_times_
[n
];
126 TimeStats
& lastpass
= n
> 0 ? this->pass_times_
[n
-1] : this->start_time_
;
127 thispass
.wall
-= lastpass
.wall
;
128 thispass
.user
-= lastpass
.user
;
129 thispass
.sys
-= lastpass
.sys
;
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