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/*
* Copyright 2006 Serge van den Boom <svdb@stack.nl>
*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "alarm.h"
#include SDL_INCLUDE(SDL.h)
#include "libs/heap.h"
#include <assert.h>
#include <stdlib.h>
Heap *alarmHeap;
static inline Alarm *
Alarm_alloc(void) {
return malloc(sizeof (Alarm));
}
static inline void
Alarm_free(Alarm *alarm) {
free(alarm);
}
static inline int
AlarmTime_compare(const AlarmTime t1, const AlarmTime t2) {
if (t1 < t2)
return -1;
if (t1 > t2)
return 1;
return 0;
}
static int
Alarm_compare(const Alarm *a1, const Alarm *a2) {
return AlarmTime_compare(a1->time, a2->time);
}
void
Alarm_init(void) {
assert(alarmHeap == NULL);
alarmHeap = Heap_new((HeapValue_Comparator) Alarm_compare,
4, 4, 0.8);
}
void
Alarm_uninit(void) {
assert(alarmHeap != NULL);
while (Heap_hasMore(alarmHeap)) {
Alarm *alarm = (Alarm *) Heap_pop(alarmHeap);
Alarm_free(alarm);
}
Heap_delete(alarmHeap);
alarmHeap = NULL;
}
static inline AlarmTime
AlarmTime_nowMs(void) {
return SDL_GetTicks();
}
Alarm *
Alarm_addAbsoluteMs(uint32 ms, AlarmCallback callback,
AlarmCallbackArg arg) {
Alarm *alarm;
assert(alarmHeap != NULL);
alarm = Alarm_alloc();
alarm->time = ms;
alarm->callback = callback;
alarm->arg = arg;
Heap_add(alarmHeap, (HeapValue *) alarm);
return alarm;
}
Alarm *
Alarm_addRelativeMs(uint32 ms, AlarmCallback callback,
AlarmCallbackArg arg) {
Alarm *alarm;
assert(alarmHeap != NULL);
alarm = Alarm_alloc();
alarm->time = AlarmTime_nowMs() + ms;
alarm->callback = callback;
alarm->arg = arg;
Heap_add(alarmHeap, (HeapValue *) alarm);
return alarm;
}
void
Alarm_remove(Alarm *alarm) {
assert(alarmHeap != NULL);
Heap_remove(alarmHeap, (HeapValue *) alarm);
Alarm_free(alarm);
}
// Process at most one alarm, if its time has come.
// It is safe to call this function again from inside a callback function
// that it called. It should not be called from multiple threads at once.
bool
Alarm_processOne(void)
{
AlarmTime now;
Alarm *alarm;
assert(alarmHeap != NULL);
if (!Heap_hasMore(alarmHeap))
return false;
now = AlarmTime_nowMs();
alarm = (Alarm *) Heap_first(alarmHeap);
if (now < alarm->time)
return false;
Heap_pop(alarmHeap);
alarm->callback(alarm->arg);
Alarm_free(alarm);
return true;
}
#if 0
// It is safe to call this function again from inside a callback function
// that it called. It should not be called from multiple threads at once.
void
Alarm_processAll(void) {
AlarmTime now;
assert(alarmHeap != NULL);
now = AlarmTime_nowMs();
while (Heap_hasMore(alarmHeap)) {
Alarm *alarm = (Alarm *) Heap_first(alarmHeap);
if (now < alarm->time)
break;
Heap_pop(alarmHeap);
alarm->callback(alarm->arg);
Alarm_free(alarm);
}
}
#endif
uint32
Alarm_timeBeforeNextMs(void) {
Alarm *alarm;
if (!Heap_hasMore(alarmHeap))
return UINT32_MAX;
alarm = (Alarm *) Heap_first(alarmHeap);
return alarmTimeToMsUint32(alarm->time);
}
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