dingusppc/core/timermanager.cpp

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2022-01-10 15:36:14 +00:00
/*
DingusPPC - The Experimental PowerPC Macintosh emulator
Copyright (C) 2018-22 divingkatae and maximum
(theweirdo) spatium
(Contact divingkatae#1017 or powermax#2286 on Discord for more info)
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 3 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, see <https://www.gnu.org/licenses/>.
*/
/** Timer management system. */
#include <loguru.hpp>
#include "timermanager.h"
#include <cinttypes>
#include <memory>
TimerManager* TimerManager::timer_manager;
uint32_t TimerManager::add_oneshot_timer(uint64_t timeout, timer_cb cb)
{
if (!timeout || timeout <= MIN_TIMEOUT_NS) {
LOG_F(WARNING, "One-shot timer too short, timeout=%llu ns", timeout);
}
TimerInfo* ti = new TimerInfo;
ti->id = ++this->id;
ti->timeout_ns = this->get_time_now() + timeout;
ti->interval_ns = 0;
ti->cb = cb;
std::shared_ptr<TimerInfo> timer_desc(ti);
// add new timer to the timer queue
this->timer_queue.push(timer_desc);
// notify listeners about changes in the timer queue
if (!this->cb_active) {
this->notify_timer_changes();
}
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return ti->id;
}
uint32_t TimerManager::add_cyclic_timer(uint64_t interval, timer_cb cb)
{
if (!interval || interval <= MIN_TIMEOUT_NS) {
LOG_F(WARNING, "Cyclic timer interval too short, timeout=%llu ns", interval);
}
TimerInfo* ti = new TimerInfo;
ti->id = ++this->id;
ti->timeout_ns = this->get_time_now() + interval;
ti->interval_ns = interval;
ti->cb = cb;
std::shared_ptr<TimerInfo> timer_desc(ti);
// add new timer to the timer queue
this->timer_queue.push(timer_desc);
// notify listeners about changes in the timer queue
if (!this->cb_active) {
this->notify_timer_changes();
}
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return ti->id;
}
void TimerManager::cancel_timer(uint32_t id)
{
TimerInfo* cur_timer = this->timer_queue.top().get();
if (cur_timer->id == id) {
this->timer_queue.pop();
} else {
this->timer_queue.remove_by_id(id);
}
if (!this->cb_active) {
this->notify_timer_changes();
}
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}
uint64_t TimerManager::process_timers(uint64_t time_now)
{
TimerInfo* cur_timer;
if (this->timer_queue.empty()) {
return 0ULL;
}
// scan for expired timers
cur_timer = this->timer_queue.top().get();
while (cur_timer->timeout_ns <= time_now ||
cur_timer->timeout_ns <= (time_now + MIN_TIMEOUT_NS)) {
timer_cb cb = cur_timer->cb;
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// re-arm cyclic timers
if (cur_timer->interval_ns) {
auto new_timer = this->timer_queue.top();
new_timer->timeout_ns = time_now + cur_timer->interval_ns;
this->timer_queue.pop();
this->timer_queue.push(new_timer);
} else {
// remove one-shot timers from queue
this->timer_queue.pop();
}
this->cb_active = true;
// invoke timer callback
cb();
this->cb_active = false;
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// process next timer
if (this->timer_queue.empty()) {
return 0ULL;
}
cur_timer = this->timer_queue.top().get();
}
// return time slice in nanoseconds until next timer's expiry
return cur_timer->timeout_ns - time_now;
}