70e0514a02
either - due to poor signal performance of base platform - due to being to less prioritized - due to schedule overload - due to using time sources of different physical CPUs Issue #3111
82 lines
1.7 KiB
C++
82 lines
1.7 KiB
C++
/*
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* \brief Handle timeouts which are late due to poor signal performance or
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* due to scheduling overload
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* \author Alexander Boettcher
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* \date 2019-05-07
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*/
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/*
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* Copyright (C) 2019 Genode Labs GmbH
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*
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* This file is distributed under the terms of the GNU General Public License
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* version 2.
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*
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* The code is partially based on the Seoul/Vancouver VMM, which is distributed
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* under the terms of the GNU General Public License version 2.
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*
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* Modifications by Intel Corporation are contributed under the terms and
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* conditions of the GNU General Public License version 2.
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*/
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#ifndef _TIMEOUT_LATE_H_
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#define _TIMEOUT_LATE_H_
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class Late_timeout
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{
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public:
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struct Remote
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{
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timevalue _now { 0 };
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timevalue _timeout { 0 };
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unsigned _timer_nr { ~0U };
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bool valid() const { return _timer_nr != ~0U; };
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};
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private:
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Genode::Lock _lock { };
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Remote _remote { };
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public:
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Late_timeout() { }
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void timeout(Clock &clock, MessageTimer const &msg)
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{
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Genode::Lock_guard<Genode::Lock> guard(_lock);
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Genode::uint64_t const now = clock.time();
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if (!_remote._now || now < _remote._now) {
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_remote._now = now;
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_remote._timeout = msg.abstime;
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_remote._timer_nr = msg.nr;
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}
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}
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Remote reset()
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{
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Genode::Lock_guard<Genode::Lock> guard(_lock);
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Remote last = _remote;
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_remote._now = 0;
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_remote._timeout = 0;
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_remote._timer_nr = ~0U;
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return last;
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}
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bool apply(Remote const &remote,
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unsigned const timer_nr,
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Genode::uint64_t now)
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{
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return (timer_nr == remote._timer_nr) &&
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((remote._timeout - remote._now) < (now - _remote._now));
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}
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};
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#endif /* _TIMEOUT_LATE_H_ */
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