75 lines
1.7 KiB
C++
75 lines
1.7 KiB
C++
/*
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* \brief Wrapper for Trace::Buffer that adds some convenient functionality
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* \author Martin Stein
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* \date 2018-01-12
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*/
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/*
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* Copyright (C) 2018 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 _TRACE_BUFFER_H_
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#define _TRACE_BUFFER_H_
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/* Genode includes */
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#include <base/trace/buffer.h>
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/**
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* Wrapper for Trace::Buffer that adds some convenient functionality
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*/
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class Trace_buffer
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{
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private:
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Genode::Trace::Buffer &_buffer;
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Genode::Trace::Buffer::Entry _curr { _buffer.first() };
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unsigned _wrapped_count { 0 };
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public:
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Trace_buffer(Genode::Trace::Buffer &buffer) : _buffer(buffer) { }
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/**
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* Call functor for each entry that wasn't yet processed
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*/
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template <typename FUNC>
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void for_each_new_entry(FUNC && functor)
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{
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using namespace Genode;
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bool wrapped = _buffer.wrapped() != _wrapped_count;
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if (wrapped)
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_wrapped_count = _buffer.wrapped();
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/* initialize _curr if _buffer was empty until now */
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if (_curr.last())
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_curr = _buffer.first();
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/* iterate over all entries that were not processed yet */
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Trace::Buffer::Entry e1 = _curr;
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for (Trace::Buffer::Entry e2 = _curr; wrapped || !e2.last();
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e2 = _buffer.next(e2))
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{
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/* if buffer wrapped, we pass the last entry once and continue at first entry */
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if (wrapped && e2.last()) {
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wrapped = false;
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e2 = _buffer.first();
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if (e2.last())
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break;
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}
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e1 = e2;
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functor(e1);
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}
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/* remember the last processed entry in _curr */
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_curr = e1;
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}
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};
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#endif /* _TRACE_BUFFER_H_ */
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