4 * Simple implementation of one-shot timers. Effectively this allows IO
5 * devices to wait until a particular time before completing. We expect
6 * there to be at least half a dozen or so continually scheduled events
7 * (TMU and PVR2), peaking around 20+.
9 * Copyright (c) 2005 Nathan Keynes.
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
22 #ifndef lxdream_eventq_H
23 #define lxdream_eventq_H 1
31 #define NOT_SCHEDULED 0xFFFFFFFF /* Sentinel value */
34 typedef void (*event_func_t)(int eventid);
37 * Register the callback to be associated with the given event ID.
38 * Note: These should be registered at init time and never changed.
40 void register_event_callback( int eventid, event_func_t func );
43 * Schedule a new pending event.
44 * @param eventid Unique ID identifying the event in question (used to remove it
45 * at a later time). If the eventid is scheduled more than once, only the lastest
46 * schedule for that ID will be valid.
47 * @param nanosecs Nanoseconds from the current SH4 time at which the event
50 void event_schedule( int eventid, uint32_t nanosecs );
53 * Schedule a long-duration pending event
55 void event_schedule_long( int eventid, uint32_t seconds, uint32_t nanosecs );
58 * Remove a previously created event without triggering it. This is usually
59 * only used when an operation is aborted.
61 void event_cancel( int eventid );
64 * Return the slice cycle time of the next event, or NOT_SCHEDULED
65 * if no events are scheduled for this time slice.
67 uint32_t event_get_next_time();
70 * Execute the event on the top of the queue, and remove it.
75 * Initialize the event queue.
79 #define MAX_EVENT_ID 128
81 /* Events 1..96 are defined as the corresponding ASIC events. */
86 #define EVENT_GUNPOS 100
88 #define EVENT_ENDTIMESLICE 127
93 #endif /* !lxdream_eventq_H */
.