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Homework2_3Multithreads_YuwenSun
Diff: lc.h
- Revision:
- 0:edab293d7652
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/lc.h Tue Nov 30 22:19:29 2010 +0000 @@ -0,0 +1,132 @@ +/* + * 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 protothreads library. + * + * Author: Adam Dunkels <adam@sics.se> + * + * $Id: lc.h,v 1.2 2005/02/24 10:36:59 adam Exp $ + */ + +/** + * \addtogroup pt + * @{ + */ + +/** + * \defgroup lc Local continuations + * @{ + * + * Local continuations form the basis for implementing protothreads. A + * local continuation can be <i>set</i> in a specific function to + * capture the state of the function. After a local continuation has + * been set can be <i>resumed</i> in order to restore the state of the + * function at the point where the local continuation was set. + * + * + */ + +/** + * \file lc.h + * Local continuations + * \author + * Adam Dunkels <adam@sics.se> + * + */ + +#ifdef DOXYGEN +/** + * Initialize a local continuation. + * + * This operation initializes the local continuation, thereby + * unsetting any previously set continuation state. + * + * \hideinitializer + */ +#define LC_INIT(lc) + +/** + * Set a local continuation. + * + * The set operation saves the state of the function at the point + * where the operation is executed. As far as the set operation is + * concerned, the state of the function does <b>not</b> include the + * call-stack or local (automatic) variables, but only the program + * counter and such CPU registers that needs to be saved. + * + * \hideinitializer + */ +#define LC_SET(lc) + +/** + * Resume a local continuation. + * + * The resume operation resumes a previously set local continuation, thus + * restoring the state in which the function was when the local + * continuation was set. If the local continuation has not been + * previously set, the resume operation does nothing. + * + * \hideinitializer + */ +#define LC_RESUME(lc) + +/** + * Mark the end of local continuation usage. + * + * The end operation signifies that local continuations should not be + * used any more in the function. This operation is not needed for + * most implementations of local continuation, but is required by a + * few implementations. + * + * \hideinitializer + */ +#define LC_END(lc) + +/** + * \var typedef lc_t; + * + * The local continuation type. + * + * \hideinitializer + */ +#endif /* DOXYGEN */ + +#ifndef __LC_H__ +#define __LC_H__ + + +#ifdef LC_INCLUDE +#include LC_INCLUDE +#else +#include "lc-switch.h" +#endif /* LC_INCLUDE */ + +#endif /* __LC_H__ */ + +/** @} */ +/** @} */