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The patch adjust the code of the base, base-<kernel>, and os repository.
To adapt existing components to fix violations of the best practices
suggested by "Effective C++" as reported by the -Weffc++ compiler
argument. The changes follow the patterns outlined below:
* A class with virtual functions can no longer publicly inherit base
classed without a vtable. The inherited object may either be moved
to a member variable, or inherited privately. The latter would be
used for classes that inherit 'List::Element' or 'Avl_node'. In order
to enable the 'List' and 'Avl_tree' to access the meta data, the
'List' must become a friend.
* Instead of adding a virtual destructor to abstract base classes,
we inherit the new 'Interface' class, which contains a virtual
destructor. This way, single-line abstract base classes can stay
as compact as they are now. The 'Interface' utility resides in
base/include/util/interface.h.
* With the new warnings enabled, all member variables must be explicitly
initialized. Basic types may be initialized with '='. All other types
are initialized with braces '{ ... }' or as class initializers. If
basic types and non-basic types appear in a row, it is nice to only
use the brace syntax (also for basic types) and align the braces.
* If a class contains pointers as members, it must now also provide a
copy constructor and assignment operator. In the most cases, one
would make them private, effectively disallowing the objects to be
copied. Unfortunately, this warning cannot be fixed be inheriting
our existing 'Noncopyable' class (the compiler fails to detect that
the inheriting class cannot be copied and still gives the error).
For now, we have to manually add declarations for both the copy
constructor and assignment operator as private class members. Those
declarations should be prepended with a comment like this:
/*
* Noncopyable
*/
Thread(Thread const &);
Thread &operator = (Thread const &);
In the future, we should revisit these places and try to replace
the pointers with references. In the presence of at least one
reference member, the compiler would no longer implicitly generate
a copy constructor. So we could remove the manual declaration.
Issue #465
88 lines
1.7 KiB
C++
88 lines
1.7 KiB
C++
/*
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* \brief Input event queue
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* \author Norman Feske
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* \date 2007-10-08
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*/
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/*
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* Copyright (C) 2007-2017 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 _EVENT_QUEUE_H_
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#define _EVENT_QUEUE_H_
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#include <base/signal.h>
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#include <input/event.h>
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#include <os/ring_buffer.h>
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namespace Input { class Event_queue; };
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class Input::Event_queue
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{
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public:
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/**
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* Input event queue
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*
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* We expect the client to fetch events circa each 10ms. The PS/2 driver
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* queues up to 255 events, which should be enough. Normally, PS/2
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* generates not more than 16Kbit/s, which would correspond to ca. 66 mouse
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* events per 10ms.
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*/
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enum { QUEUE_SIZE = 512U };
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typedef Genode::Ring_buffer<Input::Event, QUEUE_SIZE> Ring_buffer;
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private:
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Ring_buffer _queue { };
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bool _enabled = false;
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Genode::Signal_context_capability _sigh { };
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public:
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typedef Ring_buffer::Overflow Overflow;
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void enabled(bool enabled) { _enabled = enabled; }
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bool enabled() const { return _enabled; }
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void sigh(Genode::Signal_context_capability sigh) { _sigh = sigh; }
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void submit_signal()
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{
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if (_sigh.valid())
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Genode::Signal_transmitter(_sigh).submit();
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}
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/**
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* \throw Overflow
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*/
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void add(Input::Event ev, bool submit_signal_immediately = true)
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{
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if (!_enabled)
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return;
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_queue.add(ev);
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if (submit_signal_immediately)
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submit_signal();
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}
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Input::Event get() { return _queue.get(); }
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bool empty() const { return _queue.empty(); }
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int avail_capacity() const { return _queue.avail_capacity(); }
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void reset() { _queue.reset(); }
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};
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#endif /* _EVENT_QUEUE_H_ */
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