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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 *******************************************************************************/
46 Scalar
Timer::gNextFire
= std::numeric_limits
<Scalar
>::max();
47 std::map
<unsigned,Timer
*> Timer::gTimers
;
50 unsigned Timer::getNewID()
52 static unsigned id
= 1;
57 void Timer::init(const Function
& function
, Scalar seconds
, Mode mode
)
73 mAbsolute
= seconds
- getTicks();
78 gTimers
.insert(std::pair
<unsigned,Timer
*>(mId
, this));
80 if (mAbsolute
< gNextFire
) gNextFire
= mAbsolute
;
85 bool Timer::isValid() const
87 return mMode
!= INVALID
;
90 void Timer::invalidate()
97 if (isEqual(mAbsolute
, gNextFire
)) gNextFire
= findNextFire();
104 Scalar t
= getTicks();
106 if (mFunction
) mFunction(*this, t
);
110 Scalar absolute
= mAbsolute
;
112 if (isEqual(mAbsolute
, t
, 1.0)) mAbsolute
+= mInterval
;
113 else mAbsolute
= mInterval
+ t
;
115 if (isEqual(absolute
, gNextFire
)) gNextFire
= findNextFire();
124 Scalar
Timer::findNextFire()
126 std::map
<unsigned,Timer
*>::iterator it
;
127 Scalar nextFire
= std::numeric_limits
<Scalar
>::max();
129 for (it
= gTimers
.begin(); it
!= gTimers
.end(); ++it
)
131 Scalar absolute
= (*it
).second
->mAbsolute
;
132 if (absolute
< nextFire
) nextFire
= absolute
;
139 Scalar
Timer::getSecondsRemaining() const
141 return mAbsolute
- getTicks();
144 bool Timer::isExpired() const
146 return getSecondsRemaining() < 0.0;
149 bool Timer::isRepeating() const
151 return mMode
== REPEAT
;
155 void Timer::fireIfExpired()
157 fireIfExpired(getTicks());
160 void Timer::fireIfExpired(Scalar t
)
162 std::map
<unsigned,Timer
*>::iterator it
;
164 if (gNextFire
> t
) return;
166 for (it
= gTimers
.begin(); it
!= gTimers
.end(); ++it
)
168 Timer
* timer
= (*it
).second
;
169 if (timer
->isExpired()) timer
->fire();
174 #if HAVE_CLOCK_GETTIME
176 // Since the monotonic clock will provide us with the time since the computer
177 // started, the number of seconds since that time could easily become so large
178 // that it cannot be accurately stored in a float (even with as little two days
179 // uptime), therefore we need to start from a more recent reference (when the
180 // program starts). Of course this isn't much of an issue if scalar is a
181 // double-precision number.
183 static time_t setReference_()
187 if (clock_gettime(CLOCK_MONOTONIC
, &ts
) != 0)
195 static const time_t reference
= setReference_();
198 Scalar
Timer::getTicks()
202 int result
= clock_gettime(CLOCK_MONOTONIC
, &ts
);
203 ASSERT(result
== 0 && "cannot access clock");
205 return Scalar(ts
.tv_sec
- reference
) + Scalar(ts
.tv_nsec
) / 1000000000.0;
208 void Timer::sleep(Scalar seconds
, Mode mode
)
213 if (mode
== ACTUAL
) seconds
-= getTicks();
214 ts
.tv_sec
= time_t(seconds
);
215 ts
.tv_nsec
= long((seconds
- Scalar(ts
.tv_sec
)) * 1000000000.0);
219 ret
= nanosleep(&ts
, &ts
);
221 while (ret
== -1 && errno
== EINTR
);
225 #else // ! HAVE_CLOCK_GETTIME
228 // If we don't have posix timers, we'll have to use a different timing method.
229 // SDL only promises centisecond accuracy, but that's better than a kick in the
232 Scalar
Timer::getTicks()
234 Uint32 ms
= SDL_GetTicks();
235 return Scalar(ms
/ 1000) + Scalar(ms
% 1000) / 1000.0;
238 void Timer::sleep(Scalar seconds
, Mode mode
)
240 if (mode
== ACTUAL
) seconds
-= getTicks();
241 SDL_Delay(Uint32(cml::clamp(int(seconds
* 1000.0), 0, 1000)));
244 #endif // HAVE_CLOCK_GETTIME
249 /** vim: set ts=4 sw=4 tw=80: *************************************************/
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