51 lines
1.1 KiB
C++
51 lines
1.1 KiB
C++
/*
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* \brief Interface for accessing the libc's kernel timer
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* \author Norman Feske
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* \date 2019-09-19
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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 part of the Genode OS framework, which is distributed
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* under the terms of the GNU Affero General Public License version 3.
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*/
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#ifndef _LIBC__INTERNAL__KERNEL_TIMER_ACCESSOR_H_
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#define _LIBC__INTERNAL__KERNEL_TIMER_ACCESSOR_H_
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/* Genode includes */
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#include <base/env.h>
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#include <base/lock.h>
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#include <timer_session/connection.h>
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namespace Libc { struct Kernel_timer_accessor; }
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struct Libc::Kernel_timer_accessor : Timer_accessor
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{
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Genode::Env &_env;
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/*
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* The '_timer' is constructed by whatever thread (main thread
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* of pthread) that uses a time-related function first. Hence,
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* the construction must be protected by a lock.
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*/
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Lock _lock;
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Constructible<Timer> _timer;
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Kernel_timer_accessor(Genode::Env &env) : _env(env) { }
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Timer &timer() override
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{
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Lock::Guard guard(_lock);
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if (!_timer.constructed())
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_timer.construct(_env);
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return *_timer;
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}
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};
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#endif /* _LIBC__INTERNAL__KERNEL_TIMER_ACCESSOR_H_ */
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