88 lines
2.5 KiB
C++
88 lines
2.5 KiB
C++
/*
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* Copyright (c) 2013, 2016, 2017 Jonas 'Sortie' Termansen.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* sortix/kernel/clock.h
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* A virtual clock that can be measured and waited upon.
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*/
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#ifndef _INCLUDE_SORTIX_KERNEL_CLOCK_H
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#define _INCLUDE_SORTIX_KERNEL_CLOCK_H
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#include <sys/types.h>
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#include <sortix/timespec.h>
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#include <sortix/kernel/kthread.h>
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#include <sortix/kernel/interrupt.h>
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namespace Sortix {
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class Clock;
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class Timer;
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class Clock
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{
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public:
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Clock();
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~Clock();
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public:
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Timer* delay_timer;
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Timer* absolute_timer;
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Timer* first_interrupt_timer;
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Timer* last_interrupt_timer;
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struct interrupt_work interrupt_work;
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struct timespec current_time;
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struct timespec current_advancement;
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struct timespec resolution;
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kthread_mutex_t clock_mutex;
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bool clock_callable_from_interrupt;
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bool we_disabled_interrupts;
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bool interrupt_work_scheduled;
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public:
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void SetCallableFromInterrupts(bool callable_from_interrupts);
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void Set(struct timespec* now, struct timespec* res);
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void Get(struct timespec* now, struct timespec* res);
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void Advance(struct timespec duration);
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void Register(Timer* timer);
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void Unlink(Timer* timer);
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void Cancel(Timer* timer);
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bool TryCancel(Timer* timer);
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void LockClock();
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void UnlockClock();
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struct timespec SleepDelay(struct timespec duration);
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struct timespec SleepUntil(struct timespec expiration);
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public: // These should only be called if the clock is locked.
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void RegisterAbsolute(Timer* timer);
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void RegisterDelay(Timer* timer);
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void UnlinkAbsolute(Timer* timer);
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void UnlinkDelay(Timer* timer);
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private: // These should only be called if the clock is locked.
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void FireTimer(Timer* timer);
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void TriggerDelay(struct timespec unaccounted);
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void TriggerAbsolute();
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public: // Only for use by Clock__InterruptWork.
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void InterruptWork();
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};
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} // namespace Sortix
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#endif
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