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https://github.com/RGBCube/serenity
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12cf6f8650
This allows us to use blocking timeouts with either monotonic or real time for all blockers. Which means that clock_nanosleep() now also supports CLOCK_REALTIME. Also, switch alarm() to use CLOCK_REALTIME as per specification.
95 lines
3.5 KiB
C++
95 lines
3.5 KiB
C++
/*
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* Copyright (c) 2020, Liav A. <liavalb@hotmail.co.il>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include <AK/NonnullRefPtrVector.h>
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#include <AK/RefPtr.h>
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#include <AK/Types.h>
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#include <Kernel/KResult.h>
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#include <Kernel/UnixTypes.h>
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namespace Kernel {
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#define OPTIMAL_TICKS_PER_SECOND_RATE 1000
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class HardwareTimerBase;
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class TimeManagement {
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AK_MAKE_ETERNAL;
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public:
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TimeManagement();
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static bool initialized();
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static void initialize(u32 cpu);
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static TimeManagement& the();
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static timespec ticks_to_time(u64 ticks, time_t ticks_per_second);
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static u64 time_to_ticks(const timespec& tspec, time_t ticks_per_second);
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KResultOr<timespec> current_time(clockid_t clock_id) const;
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timespec monotonic_time() const;
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timespec epoch_time() const;
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void set_epoch_time(timespec);
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time_t ticks_per_second() const;
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time_t boot_time() const;
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bool is_system_timer(const HardwareTimerBase&) const;
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static void update_time(const RegisterState&);
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void increment_time_since_boot(const RegisterState&);
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static bool is_hpet_periodic_mode_allowed();
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u64 uptime_ms() const;
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u64 monotonic_ticks() const;
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static timeval now_as_timeval();
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timespec remaining_epoch_time_adjustment() const { return m_remaining_epoch_time_adjustment; }
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void set_remaining_epoch_time_adjustment(const timespec& adjustment) { m_remaining_epoch_time_adjustment = adjustment; }
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private:
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bool probe_and_set_legacy_hardware_timers();
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bool probe_and_set_non_legacy_hardware_timers();
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Vector<HardwareTimerBase*> scan_and_initialize_periodic_timers();
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Vector<HardwareTimerBase*> scan_for_non_periodic_timers();
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NonnullRefPtrVector<HardwareTimerBase> m_hardware_timers;
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void set_system_timer(HardwareTimerBase&);
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static void timer_tick(const RegisterState&);
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// Variables between m_update1 and m_update2 are synchronized
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Atomic<u32> m_update1 { 0 };
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u32 m_ticks_this_second { 0 };
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u32 m_seconds_since_boot { 0 };
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timespec m_epoch_time { 0, 0 };
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timespec m_remaining_epoch_time_adjustment { 0, 0 };
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Atomic<u32> m_update2 { 0 };
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RefPtr<HardwareTimerBase> m_system_timer;
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RefPtr<HardwareTimerBase> m_time_keeper_timer;
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};
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}
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