/usr/include/sidplayfp/event.h is in libsidplayfp-dev 1.2.2-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 | /*
* This file is part of libsidplayfp, a SID player engine.
*
* Copyright 2011-2013 Leandro Nini <drfiemost@users.sourceforge.net>
* Copyright 2007-2010 Antti Lankila
* Copyright 2001 Simon White
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#ifndef EVENT_H
#define EVENT_H
#include <stdint.h>
#include "sidplayfp/siddefs.h"
typedef int_fast64_t event_clock_t;
/**
* C64 system runs actions at system clock high and low
* states. The PHI1 corresponds to the auxiliary chip activity
* and PHI2 to CPU activity. For any clock, PHI1s are before
* PHI2s.
*/
typedef enum {EVENT_CLOCK_PHI1 = 0, EVENT_CLOCK_PHI2 = 1} event_phase_t;
/**
* Event scheduler (based on alarm from Vice). Created in 2001 by Simon A.
* White.
*
* Optimized EventScheduler and corresponding Event class by Antti S. Lankila
* in 2009.
*
* @author Antti Lankila
*/
class SID_EXTERN Event
{
friend class EventScheduler;
private:
/** Describe event for humans. */
const char * const m_name;
/** The clock this event fires */
event_clock_t triggerTime;
/** The next event in sequence */
Event *next;
public:
/**
* Events are used for delayed execution. Name is
* not used by code, but is useful for debugging.
*
* @param name Descriptive string of the event.
*/
Event(const char * const name) :
m_name(name) {}
/**
* Event code to be executed. Events are allowed to safely
* reschedule themselves with the EventScheduler during
* invocations.
*/
virtual void event() = 0;
protected:
~Event() {}
};
/**
* Fast EventScheduler, which maintains a linked list of Events.
* This scheduler takes neglible time even when it is used to
* schedule events for nearly every clock.
*
* Events occur on an internal clock which is 2x the visible clock.
* The visible clock is divided to two phases called phi1 and phi2.
*
* The phi1 clocks are used by VIC and CIA chips, phi2 clocks by CPU.
*
* Scheduling an event for a phi1 clock when system is in phi2 causes the
* event to be moved to the next phi1 cycle. Correspondingly, requesting
* a phi1 time when system is in phi2 returns the value of the next phi1.
*
* @author Antti S. Lankila
*/
class EventContext
{
public:
/**
* Cancel the specified event.
*
* @param event the event to cancel
*/
virtual void cancel(Event &event) = 0;
/**
* Add event to pending queue.
*
* At PHI2, specify cycles=0 and Phase=PHI1 to fire on the very next PHI1.
*
* @param event the event to add
* @param cycles how many cycles from now to fire
* @param phase the phase when to fire the event
*/
virtual void schedule(Event &event, event_clock_t cycles,
event_phase_t phase) = 0;
/**
* Add event to pending queue in the same phase as current event.
*
* @param event the event to add
* @param cycles how many cycles from now to fire
*/
virtual void schedule(Event &event, event_clock_t cycles) = 0;
/**
* Is the event pending in this scheduler?
*
* @param event the event
* @return true when pending
*/
virtual bool isPending(Event &event) const = 0;
/**
* Get time with respect to a specific clock phase.
*
* @param phase the phase
* @return the time according to specified phase.
*/
virtual event_clock_t getTime(event_phase_t phase) const = 0;
/**
* Get clocks since specified clock in given phase.
*
* @param clock the time to compare to
* @param phase the phase to comapre to
* @return the time between specified clock and now
*/
virtual event_clock_t getTime(event_clock_t clock, event_phase_t phase) const = 0;
/**
* Return current clock phase.
*
* @return The current phase
*/
virtual event_phase_t phase() const = 0;
protected:
~EventContext() {}
};
#endif // EVENT_H
|