| /* |
| * 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 Contiki operating system. |
| * |
| * Author: Adam Dunkels <adam@sics.se> |
| * |
| */ |
| |
| /** |
| * \addtogroup lc |
| * @{ |
| */ |
| |
| /** |
| * \file |
| * Implementation of local continuations based on switch() statement |
| * \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() statements. |
| * |
| * 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_SWITCH_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_ */ |
| |
| /** @} */ |