1*10465441SEvalZero /* 2*10465441SEvalZero * Copyright (c) 2004-2005, Swedish Institute of Computer Science. 3*10465441SEvalZero * All rights reserved. 4*10465441SEvalZero * 5*10465441SEvalZero * Redistribution and use in source and binary forms, with or without 6*10465441SEvalZero * modification, are permitted provided that the following conditions 7*10465441SEvalZero * are met: 8*10465441SEvalZero * 1. Redistributions of source code must retain the above copyright 9*10465441SEvalZero * notice, this list of conditions and the following disclaimer. 10*10465441SEvalZero * 2. Redistributions in binary form must reproduce the above copyright 11*10465441SEvalZero * notice, this list of conditions and the following disclaimer in the 12*10465441SEvalZero * documentation and/or other materials provided with the distribution. 13*10465441SEvalZero * 3. Neither the name of the Institute nor the names of its contributors 14*10465441SEvalZero * may be used to endorse or promote products derived from this software 15*10465441SEvalZero * without specific prior written permission. 16*10465441SEvalZero * 17*10465441SEvalZero * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND 18*10465441SEvalZero * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19*10465441SEvalZero * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20*10465441SEvalZero * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE 21*10465441SEvalZero * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22*10465441SEvalZero * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23*10465441SEvalZero * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24*10465441SEvalZero * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25*10465441SEvalZero * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26*10465441SEvalZero * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27*10465441SEvalZero * SUCH DAMAGE. 28*10465441SEvalZero * 29*10465441SEvalZero * This file is part of the uIP TCP/IP stack 30*10465441SEvalZero * 31*10465441SEvalZero * Author: Adam Dunkels <[email protected]> 32*10465441SEvalZero * 33*10465441SEvalZero * $Id: lc-switch.h,v 1.2 2006/06/12 08:00:30 adam Exp $ 34*10465441SEvalZero */ 35*10465441SEvalZero 36*10465441SEvalZero /** 37*10465441SEvalZero * \addtogroup lc 38*10465441SEvalZero * @{ 39*10465441SEvalZero */ 40*10465441SEvalZero 41*10465441SEvalZero /** 42*10465441SEvalZero * \file 43*10465441SEvalZero * Implementation of local continuations based on switch() statment 44*10465441SEvalZero * \author Adam Dunkels <[email protected]> 45*10465441SEvalZero * 46*10465441SEvalZero * This implementation of local continuations uses the C switch() 47*10465441SEvalZero * statement to resume execution of a function somewhere inside the 48*10465441SEvalZero * function's body. The implementation is based on the fact that 49*10465441SEvalZero * switch() statements are able to jump directly into the bodies of 50*10465441SEvalZero * control structures such as if() or while() statmenets. 51*10465441SEvalZero * 52*10465441SEvalZero * This implementation borrows heavily from Simon Tatham's coroutines 53*10465441SEvalZero * implementation in C: 54*10465441SEvalZero * http://www.chiark.greenend.org.uk/~sgtatham/coroutines.html 55*10465441SEvalZero */ 56*10465441SEvalZero 57*10465441SEvalZero #ifndef __LC_SWITCH_H__ 58*10465441SEvalZero #define __LC_SWTICH_H__ 59*10465441SEvalZero 60*10465441SEvalZero /* WARNING! lc implementation using switch() does not work if an 61*10465441SEvalZero LC_SET() is done within another switch() statement! */ 62*10465441SEvalZero 63*10465441SEvalZero /** \hideinitializer */ 64*10465441SEvalZero typedef unsigned short lc_t; 65*10465441SEvalZero 66*10465441SEvalZero #define LC_INIT(s) s = 0; 67*10465441SEvalZero 68*10465441SEvalZero #define LC_RESUME(s) switch(s) { case 0: 69*10465441SEvalZero 70*10465441SEvalZero #define LC_SET(s) s = __LINE__; case __LINE__: 71*10465441SEvalZero 72*10465441SEvalZero #define LC_END(s) } 73*10465441SEvalZero 74*10465441SEvalZero #endif /* __LC_SWITCH_H__ */ 75*10465441SEvalZero 76*10465441SEvalZero /** @} */ 77