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Dogcows Code - chaz/yoink/blob - src/Moof/Timer.cc
2 /*******************************************************************************
4 Copyright (c) 2009, Charles McGarvey
7 Redistribution and use in source and binary forms, with or without
8 modification, are permitted provided that the following conditions are met:
10 * Redistributions of source code must retain the above copyright notice,
11 this list of conditions and the following disclaimer.
12 * Redistributions in binary form must reproduce the above copyright notice,
13 this list of conditions and the following disclaimer in the documentation
14 and/or other materials provided with the distribution.
16 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
17 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
19 DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
20 FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
22 SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
23 CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24 OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
25 OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 *******************************************************************************/
47 Scalar
Timer::nextFire_
= std::numeric_limits
<Scalar
>::max();
48 std::map
<unsigned,Timer
&> Timer::timers_
;
51 unsigned Timer::getNewID()
53 static unsigned id
= 1;
58 void Timer::init(const Function
& function
, Scalar seconds
, Mode mode
)
68 if (mode
== ABSOLUTEE
)
74 mAbsolute
= seconds
- getTicks();
79 timers_
.insert(std::pair
<unsigned,Timer
&>(mId
, *this));
81 if (mAbsolute
< nextFire_
) nextFire_
= mAbsolute
;
86 bool Timer::isValid() const
88 return mMode
!= INVALID
;
91 void Timer::invalidate()
98 if (isEqual(mAbsolute
, nextFire_
)) nextFire_
= findNextFire();
105 Scalar t
= getTicks();
107 if (mFunction
) mFunction(*this, t
);
111 Scalar absolute
= mAbsolute
;
113 if (isEqual(mAbsolute
, t
, 1.0)) mAbsolute
+= mInterval
;
114 else mAbsolute
= mInterval
+ t
;
116 if (isEqual(absolute
, nextFire_
)) nextFire_
= findNextFire();
125 Scalar
Timer::findNextFire()
127 std::map
<unsigned,Timer
&>::iterator it
;
128 Scalar nextFire
= std::numeric_limits
<Scalar
>::max();
130 for (it
= timers_
.begin(); it
!= timers_
.end(); ++it
)
132 Scalar absolute
= (*it
).second
.mAbsolute
;
133 if (absolute
< nextFire
) nextFire
= absolute
;
140 Scalar
Timer::getSecondsRemaining() const
142 return mAbsolute
- getTicks();
145 bool Timer::isExpired() const
147 return getSecondsRemaining() < 0.0;
150 bool Timer::isRepeating() const
152 return mMode
== REPEAT
;
156 void Timer::fireIfExpired(Scalar t
)
158 std::map
<unsigned,Timer
&>::iterator it
;
160 if (nextFire_
> t
) return;
162 for (it
= timers_
.begin(); it
!= timers_
.end(); ++it
)
164 Timer
& timer
= (*it
).second
;
165 if (timer
.isExpired()) timer
.fire();
170 #if HAVE_CLOCK_GETTIME
172 // Since the monotonic clock will provide us with the timer since the computer
173 // started, the number of seconds since that time could easily become so large
174 // that it cannot be accurately stored in a float (even with as little two days
175 // uptime), therefore we need to start from a more recent reference (when the
176 // program starts). Of course this isn't much of an issue if scalar is a
177 // double-precision number.
179 static time_t setReference_()
183 if (clock_gettime(CLOCK_MONOTONIC
, &ts
) != 0)
191 static const time_t reference
= setReference_();
194 Scalar
Timer::getTicks()
198 if (clock_gettime(CLOCK_MONOTONIC
, &ts
) != 0)
200 throw std::runtime_error("cannot access monotonic clock");
203 return Scalar(ts
.tv_sec
- reference
) + Scalar(ts
.tv_nsec
) / 1000000000.0;
206 void Timer::sleep(Scalar seconds
, bool absolute
)
211 if (absolute
) seconds
-= getTicks();
212 ts
.tv_sec
= time_t(seconds
);
213 ts
.tv_nsec
= long((seconds
- Scalar(ts
.tv_sec
)) * 1000000000.0);
217 ret
= nanosleep(&ts
, &ts
);
219 while (ret
== -1 && errno
== EINTR
);
223 #else // ! HAVE_CLOCK_GETTIME
226 // If we don't have posix timers, we'll have to use a different timing method.
227 // SDL only promises centisecond accuracy, but that's better than a kick in the
230 Scalar
Timer::getTicks()
232 Uint32 ms
= SDL_GetTicks();
233 return Scalar(ms
/ 1000) + Scalar(ms
% 1000) / 1000.0;
236 void Timer::sleep(Scalar seconds
, bool absolute
)
238 if (absolute
) seconds
-= getTicks();
239 SDL_Delay(Uint32(cml::clamp(int(seconds
* 1000.0), 0, 1000)));
242 #endif // HAVE_CLOCK_GETTIME
247 /** vim: set ts=4 sw=4 tw=80: *************************************************/
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