Automatic date update in version.in
[binutils-gdb.git] / gold / timer.cc
blob5f7774349617c1024bcd131fbbc5b33cf4261361
1 // timer.cc -- helper class for time accounting
3 // Copyright (C) 2009-2022 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.
23 #include "gold.h"
25 #include <unistd.h>
27 #ifdef HAVE_TIMES
28 #include <sys/times.h>
29 #endif
31 #include "libiberty.h"
33 #include "timer.h"
35 namespace gold
38 // Class Timer
40 Timer::Timer()
42 this->start_time_.wall = 0;
43 this->start_time_.user = 0;
44 this->start_time_.sys = 0;
47 // Start counting the time.
48 void
49 Timer::start()
51 this->get_time(&this->start_time_);
54 // Record the time used by pass N (0 <= N <= 2).
55 void
56 Timer::stamp(int n)
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 */
65 #else
66 # ifdef CLK_TCK
67 # define TICKS_PER_SECOND CLK_TCK /* POSIX 1003.1-1988; obsolescent */
68 # else
69 # ifdef HZ
70 # define TICKS_PER_SECOND HZ /* traditional UNIX */
71 # else
72 # define TICKS_PER_SECOND 100 /* often the correct value */
73 # endif
74 # endif
75 #endif
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;
81 class Timer_init
83 public:
84 Timer_init()
86 ticks_per_sec = TICKS_PER_SECOND;
89 Timer_init timer_init;
91 // Write the current time information.
92 void
93 Timer::get_time(TimeStats *now)
95 #ifdef HAVE_TIMES
96 tms t;
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;
100 #else
101 now->wall = get_run_time() / 1000;
102 now->user = 0;
103 now->sys = 0;
104 #endif
107 // Return the stats since start was called.
108 Timer::TimeStats
109 Timer::get_elapsed_time()
111 TimeStats now;
112 this->get_time(&now);
113 TimeStats delta;
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;
117 return delta;
120 // Return the stats for pass N (0 <= N <= 2).
121 Timer::TimeStats
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;
130 return thispass;