forked from dolphin-emu/dolphin
fb5537213a
Events don't update the downcount until after the first Advance(), thus Advance() must be called once before scheduling works normally.
106 lines
3.6 KiB
C++
106 lines
3.6 KiB
C++
// Copyright 2008 Dolphin Emulator Project
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// Licensed under GPLv2+
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// Refer to the license.txt file included.
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#pragma once
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// This is a system to schedule events into the emulated machine's future. Time is measured
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// in main CPU clock cycles.
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// To schedule an event, you first have to register its type. This is where you pass in the
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// callback. You then schedule events using the type id you get back.
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// See HW/SystemTimers.cpp for the main part of Dolphin's usage of this scheduler.
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// The int cyclesLate that the callbacks get is how many cycles late it was.
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// So to schedule a new event on a regular basis:
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// inside callback:
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// ScheduleEvent(periodInCycles - cyclesLate, callback, "whatever")
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#include <string>
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#include "Common/CommonTypes.h"
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class PointerWrap;
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namespace CoreTiming
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{
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// These really shouldn't be global, but jit64 accesses them directly
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extern s64 g_global_timer;
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extern u64 g_fake_TB_start_value;
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extern u64 g_fake_TB_start_ticks;
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extern int g_slice_length;
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extern float g_last_OC_factor_inverted;
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// CoreTiming begins at the boundary of timing slice -1. An initial call to Advance() is
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// required to end slice -1 and start slice 0 before the first cycle of code is executed.
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void Init();
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void Shutdown();
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typedef void (*TimedCallback)(u64 userdata, s64 cyclesLate);
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// This should only be called from the CPU thread, if you are calling it any other thread, you are
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// doing something evil
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u64 GetTicks();
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u64 GetIdleTicks();
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void DoState(PointerWrap& p);
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struct EventType;
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// Returns the event_type identifier. if name is not unique, an existing event_type will be
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// discarded.
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EventType* RegisterEvent(const std::string& name, TimedCallback callback);
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void UnregisterAllEvents();
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enum class FromThread
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{
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CPU,
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NON_CPU,
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// Don't use ANY unless you're sure you need to call from
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// both the CPU thread and at least one other thread
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ANY
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};
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// userdata MAY NOT CONTAIN POINTERS. userdata might get written and reloaded from savestates.
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// After the first Advance, the slice lengths and the downcount will be reduced whenever an event
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// is scheduled earlier than the current values (when scheduled from the CPU Thread only).
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// Scheduling from a callback will not update the downcount until the Advance() completes.
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void ScheduleEvent(s64 cycles_into_future, EventType* event_type, u64 userdata = 0,
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FromThread from = FromThread::CPU);
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// We only permit one event of each type in the queue at a time.
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void RemoveEvent(EventType* event_type);
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void RemoveAllEvents(EventType* event_type);
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// Advance must be called at the beginning of dispatcher loops, not the end. Advance() ends
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// the previous timing slice and begins the next one, you must Advance from the previous
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// slice to the current one before executing any cycles. CoreTiming starts in slice -1 so an
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// Advance() is required to initialize the slice length before the first cycle of emulated
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// instructions is executed.
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// NOTE: Advance updates the PowerPC downcount and performs a PPC external exception check.
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void Advance();
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void MoveEvents();
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// Pretend that the main CPU has executed enough cycles to reach the next event.
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void Idle();
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// Clear all pending events. This should ONLY be done on exit or state load.
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void ClearPendingEvents();
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void LogPendingEvents();
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std::string GetScheduledEventsSummary();
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u32 GetFakeDecStartValue();
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void SetFakeDecStartValue(u32 val);
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u64 GetFakeDecStartTicks();
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void SetFakeDecStartTicks(u64 val);
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u64 GetFakeTBStartValue();
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void SetFakeTBStartValue(u64 val);
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u64 GetFakeTBStartTicks();
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void SetFakeTBStartTicks(u64 val);
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void ForceExceptionCheck(s64 cycles);
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} // end of namespace
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