3 * Copyright 2008, Google Inc.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are met:
8 * 1. Redistributions of source code must retain the above copyright notice,
9 * this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright notice,
11 * this list of conditions and the following disclaimer in the documentation
12 * and/or other materials provided with the distribution.
13 * 3. The name of the author may not be used to endorse or promote products
14 * derived from this software without specific prior written permission.
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
17 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
18 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
19 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
20 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
21 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
22 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
23 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
24 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
25 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 #include "talk/base/timing.h"
29 #include "talk/base/timeutils.h"
36 #include <mach/mach.h>
37 #include <mach/clock.h>
40 #include <sys/timeb.h>
41 #include "talk/base/win32.h"
48 // This may fail, but we handle failure gracefully in the methods
49 // that use it (use alternative sleep method).
51 // TODO: Make it possible for user to tell if IdleWait will
52 // be done at lesser resolution because of this.
53 timer_handle_ = CreateWaitableTimer(NULL, // Security attributes.
54 FALSE, // Manual reset?
61 if (timer_handle_ != NULL)
62 CloseHandle(timer_handle_);
66 double Timing::WallTimeNow() {
69 gettimeofday(&time, NULL);
70 // Convert from second (1.0) and microsecond (1e-6).
71 return (static_cast<double>(time.tv_sec) +
72 static_cast<double>(time.tv_usec) * 1.0e-6);
77 // Convert from second (1.0) and milliseconds (1e-3).
78 return (static_cast<double>(time.time) +
79 static_cast<double>(time.millitm) * 1.0e-3);
83 double Timing::TimerNow() {
84 return (static_cast<double>(TimeNanos()) / kNumNanosecsPerSec);
87 double Timing::BusyWait(double period) {
88 double start_time = TimerNow();
89 while (TimerNow() - start_time < period) {
91 return TimerNow() - start_time;
94 double Timing::IdleWait(double period) {
95 double start_time = TimerNow();
98 double sec_int, sec_frac = modf(period, &sec_int);
100 ts.tv_sec = static_cast<time_t>(sec_int);
101 ts.tv_nsec = static_cast<long>(sec_frac * 1.0e9); // NOLINT
103 // NOTE(liulk): for the NOLINT above, long is the appropriate POSIX
106 // POSIX nanosleep may be interrupted by signals.
107 while (nanosleep(&ts, &ts) == -1 && errno == EINTR) {
111 if (timer_handle_ != NULL) {
112 LARGE_INTEGER due_time;
114 // Negative indicates relative time. The unit is 100 nanoseconds.
115 due_time.QuadPart = -LONGLONG(period * 1.0e7);
117 SetWaitableTimer(timer_handle_, &due_time, 0, NULL, NULL, TRUE);
118 WaitForSingleObject(timer_handle_, INFINITE);
120 // Still attempts to sleep with lesser resolution.
121 // The unit is in milliseconds.
122 Sleep(DWORD(period * 1.0e3));
126 return TimerNow() - start_time;
129 } // namespace talk_base