5f6328d9c6
dev/pktfifo.cc:
need to checkpoint _reserved
dev/pktfifo.hh:
When clearing, clear _reserved
size() is used for determining how many bytes are in the fifo
ready to be pulled, so we don't want to add _reserved
avail() on the other hand is used for determining how much
free space is in the fifo for adding packets.
adjust the implementation of empty() and full() to reflect this.
--HG--
extra : convert_revision : 3281972b4b70ea5833d39ae7ce1e73648b3573b0
108 lines
3.2 KiB
C++
108 lines
3.2 KiB
C++
/*
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* Copyright (c) 2002-2004 The Regents of The University of Michigan
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met: redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer;
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* redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution;
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* neither the name of the copyright holders nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef __DEV_PKTFIFO_HH__
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#define __DEV_PKTFIFO_HH__
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#include <iosfwd>
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#include <list>
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#include <string>
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#include "dev/etherpkt.hh"
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#include "sim/serialize.hh"
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class Checkpoint;
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class PacketFifo
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{
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protected:
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std::list<PacketPtr> fifo;
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int _maxsize;
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int _size;
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int _reserved;
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public:
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explicit PacketFifo(int max) : _maxsize(max), _size(0), _reserved(0) {}
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virtual ~PacketFifo() {}
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int packets() const { return fifo.size(); }
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int maxsize() const { return _maxsize; }
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int size() const { return _size; }
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int reserved() const { return _reserved; }
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int avail() const { return _maxsize - _size - _reserved; }
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bool empty() const { return size() <= 0; }
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bool full() const { return avail() <= 0; }
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int reserve(int len = 0)
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{
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_reserved += len;
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assert(avail() >= 0);
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return _reserved;
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}
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bool push(PacketPtr ptr)
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{
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assert(_reserved <= ptr->length);
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if (avail() < ptr->length - _reserved)
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return false;
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_size += ptr->length;
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fifo.push_back(ptr);
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_reserved = 0;
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return true;
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}
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PacketPtr front() { return fifo.front(); }
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void pop()
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{
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if (empty())
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return;
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_size -= fifo.front()->length;
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fifo.front() = NULL;
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fifo.pop_front();
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}
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void clear()
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{
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fifo.clear();
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_size = 0;
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_reserved = 0;
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}
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/**
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* Serialization stuff
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*/
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public:
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void serialize(const std::string &base, std::ostream &os);
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void unserialize(const std::string &base,
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Checkpoint *cp, const std::string §ion);
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};
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#endif // __DEV_PKTFIFO_HH__
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