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[/] [openrisc/] [trunk/] [rtos/] [freertos-6.1.1/] [Demo/] [Common/] [ethernet/] [uIP/] [uip-1.0/] [uip/] [lc-switch.h] - Rev 637
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/* * Copyright (c) 2004-2005, Swedish Institute of Computer Science. * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the Institute nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * This file is part of the uIP TCP/IP stack * * Author: Adam Dunkels <adam@sics.se> * * $Id: lc-switch.h 2 2011-07-17 20:13:17Z filepang@gmail.com $ */ /** * \addtogroup lc * @{ */ /** * \file * Implementation of local continuations based on switch() statment * \author Adam Dunkels <adam@sics.se> * * This implementation of local continuations uses the C switch() * statement to resume execution of a function somewhere inside the * function's body. The implementation is based on the fact that * switch() statements are able to jump directly into the bodies of * control structures such as if() or while() statmenets. * * This implementation borrows heavily from Simon Tatham's coroutines * implementation in C: * http://www.chiark.greenend.org.uk/~sgtatham/coroutines.html */ #ifndef __LC_SWITCH_H__ #define __LC_SWTICH_H__ /* WARNING! lc implementation using switch() does not work if an LC_SET() is done within another switch() statement! */ /** \hideinitializer */ typedef unsigned short lc_t; #define LC_INIT(s) s = 0; #define LC_RESUME(s) switch(s) { case 0: #define LC_SET(s) s = __LINE__; case __LINE__: #define LC_END(s) } #endif /* __LC_SWITCH_H__ */ /** @} */
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