nest-open-source / nest-learning-thermostat / 5.1.7 / nspr / d9983f48184703e94753a0cafe2f85a103be5000 / . / nspr-4.8.6 / mozilla / nsprpub / pr / src / misc / prinrval.c

/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ | |

/* ***** BEGIN LICENSE BLOCK ***** | |

* Version: MPL 1.1/GPL 2.0/LGPL 2.1 | |

* | |

* The contents of this file are subject to the Mozilla Public License Version | |

* 1.1 (the "License"); you may not use this file except in compliance with | |

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* | |

* Software distributed under the License is distributed on an "AS IS" basis, | |

* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License | |

* for the specific language governing rights and limitations under the | |

* License. | |

* | |

* The Original Code is the Netscape Portable Runtime (NSPR). | |

* | |

* The Initial Developer of the Original Code is | |

* Netscape Communications Corporation. | |

* Portions created by the Initial Developer are Copyright (C) 1998-2000 | |

* the Initial Developer. All Rights Reserved. | |

* | |

* Contributor(s): | |

* | |

* Alternatively, the contents of this file may be used under the terms of | |

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* ***** END LICENSE BLOCK ***** */ | |

/* | |

* file: prinrval.c | |

* description: implementation for the kernel interval timing functions | |

*/ | |

#include "primpl.h" | |

/* | |

*----------------------------------------------------------------------- | |

* | |

* _PR_InitClock -- | |

* | |

* | |

*----------------------------------------------------------------------- | |

*/ | |

void _PR_InitClock(void) | |

{ | |

_PR_MD_INTERVAL_INIT(); | |

#ifdef DEBUG | |

{ | |

PRIntervalTime ticksPerSec = PR_TicksPerSecond(); | |

PR_ASSERT(ticksPerSec >= PR_INTERVAL_MIN); | |

PR_ASSERT(ticksPerSec <= PR_INTERVAL_MAX); | |

} | |

#endif /* DEBUG */ | |

} | |

/* | |

* This version of interval times is based on the time of day | |

* capability offered by system. This isn't valid for two reasons: | |

* 1) The time of day is neither linear nor montonically increasing | |

* 2) The units here are milliseconds. That's not appropriate for our use. | |

*/ | |

PR_IMPLEMENT(PRIntervalTime) PR_IntervalNow(void) | |

{ | |

if (!_pr_initialized) _PR_ImplicitInitialization(); | |

return _PR_MD_GET_INTERVAL(); | |

} /* PR_IntervalNow */ | |

PR_EXTERN(PRUint32) PR_TicksPerSecond(void) | |

{ | |

if (!_pr_initialized) _PR_ImplicitInitialization(); | |

return _PR_MD_INTERVAL_PER_SEC(); | |

} /* PR_TicksPerSecond */ | |

PR_IMPLEMENT(PRIntervalTime) PR_SecondsToInterval(PRUint32 seconds) | |

{ | |

return seconds * PR_TicksPerSecond(); | |

} /* PR_SecondsToInterval */ | |

PR_IMPLEMENT(PRIntervalTime) PR_MillisecondsToInterval(PRUint32 milli) | |

{ | |

PRIntervalTime ticks; | |

PRUint64 tock, tps, msecPerSec, rounding; | |

LL_UI2L(tock, milli); | |

LL_I2L(msecPerSec, PR_MSEC_PER_SEC); | |

LL_I2L(rounding, (PR_MSEC_PER_SEC >> 1)); | |

LL_I2L(tps, PR_TicksPerSecond()); | |

LL_MUL(tock, tock, tps); | |

LL_ADD(tock, tock, rounding); | |

LL_DIV(tock, tock, msecPerSec); | |

LL_L2UI(ticks, tock); | |

return ticks; | |

} /* PR_MillisecondsToInterval */ | |

PR_IMPLEMENT(PRIntervalTime) PR_MicrosecondsToInterval(PRUint32 micro) | |

{ | |

PRIntervalTime ticks; | |

PRUint64 tock, tps, usecPerSec, rounding; | |

LL_UI2L(tock, micro); | |

LL_I2L(usecPerSec, PR_USEC_PER_SEC); | |

LL_I2L(rounding, (PR_USEC_PER_SEC >> 1)); | |

LL_I2L(tps, PR_TicksPerSecond()); | |

LL_MUL(tock, tock, tps); | |

LL_ADD(tock, tock, rounding); | |

LL_DIV(tock, tock, usecPerSec); | |

LL_L2UI(ticks, tock); | |

return ticks; | |

} /* PR_MicrosecondsToInterval */ | |

PR_IMPLEMENT(PRUint32) PR_IntervalToSeconds(PRIntervalTime ticks) | |

{ | |

return ticks / PR_TicksPerSecond(); | |

} /* PR_IntervalToSeconds */ | |

PR_IMPLEMENT(PRUint32) PR_IntervalToMilliseconds(PRIntervalTime ticks) | |

{ | |

PRUint32 milli; | |

PRUint64 tock, tps, msecPerSec, rounding; | |

LL_UI2L(tock, ticks); | |

LL_I2L(msecPerSec, PR_MSEC_PER_SEC); | |

LL_I2L(tps, PR_TicksPerSecond()); | |

LL_USHR(rounding, tps, 1); | |

LL_MUL(tock, tock, msecPerSec); | |

LL_ADD(tock, tock, rounding); | |

LL_DIV(tock, tock, tps); | |

LL_L2UI(milli, tock); | |

return milli; | |

} /* PR_IntervalToMilliseconds */ | |

PR_IMPLEMENT(PRUint32) PR_IntervalToMicroseconds(PRIntervalTime ticks) | |

{ | |

PRUint32 micro; | |

PRUint64 tock, tps, usecPerSec, rounding; | |

LL_UI2L(tock, ticks); | |

LL_I2L(usecPerSec, PR_USEC_PER_SEC); | |

LL_I2L(tps, PR_TicksPerSecond()); | |

LL_USHR(rounding, tps, 1); | |

LL_MUL(tock, tock, usecPerSec); | |

LL_ADD(tock, tock, rounding); | |

LL_DIV(tock, tock, tps); | |

LL_L2UI(micro, tock); | |

return micro; | |

} /* PR_IntervalToMicroseconds */ | |

/* prinrval.c */ | |