Atmosphere/libraries/libstratosphere/include/stratosphere/os/os_timeout_helper.hpp

64 lines
1.8 KiB
C++

/*
* Copyright (c) 2018-2020 Atmosphère-NX
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope 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 <http://www.gnu.org/licenses/>.
*/
#pragma once
#include "os_common_types.hpp"
namespace ams::os {
class TimeoutHelper {
private:
u64 end_tick;
public:
TimeoutHelper(u64 ns) {
/* Special case zero-time timeouts. */
if (ns == 0) {
end_tick = 0;
return;
}
u64 cur_tick = armGetSystemTick();
this->end_tick = cur_tick + NsToTick(ns) + 1;
}
static constexpr inline u64 NsToTick(u64 ns) {
return (ns * 12) / 625;
}
static constexpr inline u64 TickToNs(u64 tick) {
return (tick * 625) / 12;
}
inline bool TimedOut() const {
if (this->end_tick == 0) {
return true;
}
return armGetSystemTick() >= this->end_tick;
}
inline u64 NsUntilTimeout() const {
u64 diff = TickToNs(this->end_tick - armGetSystemTick());
if (this->TimedOut()) {
return 0;
}
return diff;
}
};
}