dingusppc/core/timermanager.h

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/*
DingusPPC - The Experimental PowerPC Macintosh emulator
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Copyright (C) 2018-23 divingkatae and maximum
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(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/>.
*/
#ifndef TIMER_MANAGER_H
#define TIMER_MANAGER_H
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#include <algorithm>
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#include <cinttypes>
#include <functional>
#include <memory>
#include <queue>
#include <vector>
using namespace std;
#define MIN_TIMEOUT_NS 200
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#define NS_PER_SEC 1E9
#define USEC_PER_SEC 1E6
#define NS_PER_USEC 1000UL
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#define NS_PER_MSEC 1E6
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#define ONE_BILLION_NS 0x3B9ACA00UL
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#define USECS_TO_NSECS(us) (us) * NS_PER_USEC
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#define MSECS_TO_NSECS(ms) (ms) * NS_PER_MSEC
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typedef function<void()> timer_cb;
/** Extend std::priority_queue as suggested here:
https://stackoverflow.com/a/36711682
to be able to remove arbitrary elements.
*/
template <typename T, class Container = std::vector<T>, class Compare = std::less<typename Container::value_type>>
class my_priority_queue : public std::priority_queue<T, Container, Compare> {
public:
bool remove_by_id(const uint32_t id){
auto it = std::find_if(
this->c.begin(), this->c.end(), [id](const T& el) { return el->id == id; });
if (it != this->c.end()) {
this->c.erase(it);
std::make_heap(this->c.begin(), this->c.end(), this->comp);
return true;
} else {
return false;
}
};
};
typedef struct TimerInfo {
uint32_t id;
uint64_t timeout_ns; // timer expiry
uint64_t interval_ns; // 0 for one-shot timers
timer_cb cb; // timer callback
} TimerInfo;
// Custom comparator for sorting our timer queue in ascending order
class MyGtComparator {
public:
bool operator()(const shared_ptr<TimerInfo>& l, const shared_ptr<TimerInfo>& r) {
return l.get()->timeout_ns > r.get()->timeout_ns;
}
};
class TimerManager {
public:
static TimerManager* get_instance() {
if (!timer_manager) {
timer_manager = new TimerManager();
}
return timer_manager;
};
// callback for retrieving current time
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void set_time_now_cb(const function<uint64_t()> &cb) {
this->get_time_now = cb;
};
// callback for acknowledging time changes
void set_notify_changes_cb(const timer_cb &cb) {
this->notify_timer_changes = cb;
};
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// return current virtual time in nanoseconds
uint64_t current_time_ns() { return get_time_now(); };
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// creating and cancelling timers
uint32_t add_oneshot_timer(uint64_t timeout, timer_cb cb);
uint32_t add_cyclic_timer(uint64_t interval, timer_cb cb);
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uint32_t add_cyclic_timer(uint64_t interval, uint64_t delay, timer_cb cb);
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void cancel_timer(uint32_t id);
uint64_t process_timers(uint64_t time_now);
private:
static TimerManager* timer_manager;
TimerManager(){}; // private constructor to implement a singleton
// timer queue
my_priority_queue<shared_ptr<TimerInfo>, vector<shared_ptr<TimerInfo>>, MyGtComparator> timer_queue;
function<uint64_t()> get_time_now;
function<void()> notify_timer_changes;
uint32_t id = 0;
bool cb_active = false; // true if a timer callback is executing
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};
#endif // TIMER_MANAGER_H