mirror of https://github.com/stenzek/duckstation
Implement event-based scheduler instead of lock-step components
Connor McLaughlin
6 years ago
parent
624888e131
commit
1b9609ef61
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#include "timing_event.h"
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#include "common/assert.h"
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#include "cpu_core.h"
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#include "system.h"
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TimingEvent::TimingEvent(System* system, std::string name, TickCount period, TickCount interval,
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TimingEventCallback callback)
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: m_downcount(interval), m_time_since_last_run(0), m_period(period), m_interval(interval),
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m_callback(std::move(callback)), m_system(system), m_name(std::move(name)), m_active(false)
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{
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}
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TimingEvent::~TimingEvent()
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{
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if (m_active)
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m_system->RemoveActiveEvent(this);
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}
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TickCount TimingEvent::GetTicksSinceLastExecution() const
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{
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return m_system->m_cpu->GetPendingTicks() + m_time_since_last_run;
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}
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TickCount TimingEvent::GetTicksUntilNextExecution() const
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{
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return std::max(m_downcount - m_system->m_cpu->GetPendingTicks(), static_cast<TickCount>(0));
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}
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void TimingEvent::Schedule(TickCount ticks)
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{
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m_downcount = ticks;
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m_time_since_last_run = 0;
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// Factor in partial time if this was rescheduled outside of an event handler. Say, an MMIO write.
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if (!m_system->m_running_events)
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{
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const TickCount pending_ticks = m_system->m_cpu->GetPendingTicks();
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m_downcount += pending_ticks;
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m_time_since_last_run -= pending_ticks;
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}
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if (m_active)
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{
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// If this is a call from an IO handler for example, re-sort the event queue.
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m_system->SortEvents();
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}
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else
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{
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m_active = true;
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m_system->AddActiveEvent(this);
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}
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}
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void TimingEvent::SetIntervalAndSchedule(TickCount ticks)
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{
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SetInterval(ticks);
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Schedule(ticks);
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}
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void TimingEvent::SetPeriodAndSchedule(TickCount ticks)
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{
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SetPeriod(ticks);
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SetInterval(ticks);
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Schedule(ticks);
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}
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void TimingEvent::Reset()
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{
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if (!m_active)
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return;
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m_downcount = m_interval;
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m_time_since_last_run = 0;
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m_system->SortEvents();
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}
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void TimingEvent::InvokeEarly(bool force /* = false */)
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{
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if (!m_active)
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return;
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const TickCount pending_ticks = m_system->m_running_events ? 0 : m_system->m_cpu->GetPendingTicks();
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const TickCount ticks_to_execute = m_time_since_last_run + pending_ticks;
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if (!force && ticks_to_execute < m_period)
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return;
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m_downcount = pending_ticks + m_interval;
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m_time_since_last_run -= ticks_to_execute;
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m_callback(ticks_to_execute, 0);
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// Since we've changed the downcount, we need to re-sort the events.
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m_system->SortEvents();
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}
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void TimingEvent::Activate()
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{
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if (m_active)
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return;
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// leave the downcount intact
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const TickCount pending_ticks = m_system->m_running_events ? 0 : m_system->m_cpu->GetPendingTicks();
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m_downcount += pending_ticks;
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m_time_since_last_run -= pending_ticks;
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m_active = true;
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m_system->AddActiveEvent(this);
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}
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void TimingEvent::Deactivate()
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{
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if (!m_active)
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return;
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const TickCount pending_ticks = m_system->m_running_events ? 0 : m_system->m_cpu->GetPendingTicks();
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m_downcount -= pending_ticks;
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m_time_since_last_run += pending_ticks;
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m_active = false;
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m_system->RemoveActiveEvent(this);
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}
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void TimingEvent::SetDowncount(TickCount downcount)
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{
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const TickCount pending_ticks = m_system->m_running_events ? 0 : m_system->m_cpu->GetPendingTicks();
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m_downcount = downcount + pending_ticks;
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m_time_since_last_run = -pending_ticks;
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if (m_active)
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m_system->SortEvents();
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}
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@ -0,0 +1,76 @@
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#pragma once
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#include <functional>
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#include <memory>
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#include <vector>
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#include "types.h"
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class System;
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class TimingEvent;
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// Event callback type. Second parameter is the number of cycles the event was executed "late".
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using TimingEventCallback = std::function<void(TickCount ticks, TickCount ticks_late)>;
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class TimingEvent
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{
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friend System;
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public:
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TimingEvent(System* system, std::string name, TickCount period, TickCount interval, TimingEventCallback callback);
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~TimingEvent();
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System* GetSystem() const { return m_system; }
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const std::string& GetName() const { return m_name; }
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bool IsActive() const { return m_active; }
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// Returns the number of ticks between each event.
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TickCount GetPeriod() const { return m_period; }
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TickCount GetInterval() const { return m_interval; }
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TickCount GetDowncount() const { return m_downcount; }
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// Includes pending time.
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TickCount GetTicksSinceLastExecution() const;
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TickCount GetTicksUntilNextExecution() const;
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void Schedule(TickCount ticks);
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void SetIntervalAndSchedule(TickCount ticks);
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void SetPeriodAndSchedule(TickCount ticks);
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void Reset();
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// Services the event with the current accmulated time. If force is set, when not enough time is pending to
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// simulate a single cycle, the callback will still be invoked, otherwise it won't be.
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void InvokeEarly(bool force = false);
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// Deactivates the event, preventing it from firing again.
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// Do not call within a callback, return Deactivate instead.
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void Activate();
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void Deactivate();
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ALWAYS_INLINE void SetState(bool active)
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{
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if (active)
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Activate();
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else
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Deactivate();
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}
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// Directly alters the downcount of the event.
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void SetDowncount(TickCount downcount);
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// Directly alters the interval of the event.
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void SetInterval(TickCount interval) { m_interval = interval; }
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void SetPeriod(TickCount period) { m_period = period; }
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private:
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TickCount m_downcount;
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TickCount m_time_since_last_run;
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TickCount m_period;
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TickCount m_interval;
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TimingEventCallback m_callback;
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System* m_system;
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std::string m_name;
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bool m_active;
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};
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