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Kernel: Add CLOCK_MONOTONIC_COARSE to the kernel time page
This allows clock_gettime(CLOCK_MONOTONIC_COARSE) without syscalls. Core::EventLoop takes advantage of this automatically. :^)
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b7dae4f90e
Notes:
sideshowbarker
2024-07-18 07:09:11 +09:00
Author: https://github.com/awesomekling Commit: https://github.com/SerenityOS/serenity/commit/b7dae4f90ec
@ -18,7 +18,7 @@ namespace Kernel {
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inline bool time_page_supports(clockid_t clock_id)
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{
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return clock_id == CLOCK_REALTIME_COARSE;
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return clock_id == CLOCK_REALTIME_COARSE || clock_id == CLOCK_MONOTONIC_COARSE;
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}
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struct TimePage {
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@ -363,9 +363,9 @@ void TimeManagement::increment_time_since_boot_hpet()
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// TODO: Apply m_remaining_epoch_time_adjustment
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timespec_add(m_epoch_time, { (time_t)(delta_ns / 1000000000), (long)(delta_ns % 1000000000) }, m_epoch_time);
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update_time_page();
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m_update1.store(update_iteration + 1, AK::MemoryOrder::memory_order_release);
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update_time_page();
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}
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void TimeManagement::increment_time_since_boot()
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@ -396,8 +396,9 @@ void TimeManagement::increment_time_since_boot()
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m_ticks_this_second = 0;
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}
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update_time_page();
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m_update1.store(update_iteration + 1, AK::MemoryOrder::memory_order_release);
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update_time_page();
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}
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void TimeManagement::system_timer_tick(const RegisterState& regs)
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@ -432,6 +433,7 @@ void TimeManagement::update_time_page()
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auto* page = time_page();
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u32 update_iteration = AK::atomic_fetch_add(&page->update2, 1u, AK::MemoryOrder::memory_order_acquire);
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page->clocks[CLOCK_REALTIME_COARSE] = m_epoch_time;
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page->clocks[CLOCK_MONOTONIC_COARSE] = monotonic_time(TimePrecision::Coarse).to_timespec();
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AK::atomic_store(&page->update1, update_iteration + 1u, AK::MemoryOrder::memory_order_release);
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}
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