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69 lines
1.4 KiB
C++
69 lines
1.4 KiB
C++
/*
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* \brief OKL4-specific layout of IPC message buffer
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* \author Norman Feske
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* \date 2009-03-25
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*
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* On OKL4, we do not directly use the a kernel-specific message-buffer layout.
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* The IPC goes through the UTCBs of the sending and receiving threads. Because
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* on Genode, message buffers are decoupled from threads, we need to copy-in
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* and copy-out the message payload between the message buffers and the used
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* UTCBs.
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*/
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/*
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* Copyright (C) 2009-2012 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 General Public License version 2.
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*/
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#ifndef _INCLUDE__BASE__IPC_MSGBUF_H_
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#define _INCLUDE__BASE__IPC_MSGBUF_H_
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namespace Genode {
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/**
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* IPC message buffer layout
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*/
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class Msgbuf_base
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{
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protected:
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size_t _size;
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char _msg_start[]; /* symbol marks start of message */
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public:
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/*
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* Begin of actual message buffer
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*/
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char buf[];
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/**
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* Return size of message buffer
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*/
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inline size_t size() const { return _size; };
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/**
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* Return address of message buffer
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*/
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inline void *addr() { return &_msg_start[0]; };
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};
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/**
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* Instance of IPC message buffer with specified buffer size
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*/
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template <unsigned BUF_SIZE>
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class Msgbuf : public Msgbuf_base
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{
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public:
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char buf[BUF_SIZE];
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Msgbuf() { _size = BUF_SIZE; }
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};
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}
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#endif /* _INCLUDE__BASE__IPC_MSGBUF_H_ */
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