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1 581 jeremybenn 
/*
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 * Copyright (c) 2004-2005, Swedish Institute of Computer Science.
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 * 1. Redistributions of source code must retain the above copyright
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 *    notice, this list of conditions and the following disclaimer.
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 * 2. Redistributions in binary form must reproduce the above copyright
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 *    notice, this list of conditions and the following disclaimer in the
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 *    documentation and/or other materials provided with the distribution.
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 * 3. Neither the name of the Institute nor the names of its contributors
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 *    may be used to endorse or promote products derived from this software
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 *    without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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 * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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 * SUCH DAMAGE.
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 *
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 * This file is part of the uIP TCP/IP stack
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 *
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 * Author: Adam Dunkels <adam@sics.se>
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 *
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 * $Id: pt.h 2 2011-07-17 20:13:17Z filepang@gmail.com $
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 */
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/**
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 * \addtogroup pt
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 * @{
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 */
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/**
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 * \file
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 * Protothreads implementation.
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 * \author
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 * Adam Dunkels <adam@sics.se>
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 *
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 */
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#ifndef __PT_H__
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#define __PT_H__
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#include "lc.h"
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struct pt {
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  lc_t lc;
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};
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#define PT_WAITING 0
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#define PT_EXITED  1
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#define PT_ENDED   2
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#define PT_YIELDED 3
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/**
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 * \name Initialization
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 * @{
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 */
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/**
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 * Initialize a protothread.
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 *
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 * Initializes a protothread. Initialization must be done prior to
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 * starting to execute the protothread.
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 *
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 * \param pt A pointer to the protothread control structure.
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 *
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 * \sa PT_SPAWN()
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 *
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 * \hideinitializer
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 */
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#define PT_INIT(pt)   LC_INIT((pt)->lc)
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/** @} */
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/**
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 * \name Declaration and definition
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 * @{
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 */
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/**
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 * Declaration of a protothread.
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 *
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 * This macro is used to declare a protothread. All protothreads must
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 * be declared with this macro.
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 *
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 * \param name_args The name and arguments of the C function
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 * implementing the protothread.
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 *
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 * \hideinitializer
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 */
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#define PT_THREAD(name_args) char name_args
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/**
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 * Declare the start of a protothread inside the C function
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 * implementing the protothread.
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 *
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 * This macro is used to declare the starting point of a
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 * protothread. It should be placed at the start of the function in
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 * which the protothread runs. All C statements above the PT_BEGIN()
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 * invokation will be executed each time the protothread is scheduled.
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 *
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 * \param pt A pointer to the protothread control structure.
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 *
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 * \hideinitializer
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 */
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#define PT_BEGIN(pt) { char PT_YIELD_FLAG = 1; LC_RESUME((pt)->lc)
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/**
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 * Declare the end of a protothread.
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 *
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 * This macro is used for declaring that a protothread ends. It must
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 * always be used together with a matching PT_BEGIN() macro.
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 *
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 * \param pt A pointer to the protothread control structure.
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 *
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 * \hideinitializer
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 */
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#define PT_END(pt) LC_END((pt)->lc); PT_YIELD_FLAG = 0; \
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                   PT_INIT(pt); return PT_ENDED; }
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/** @} */
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/**
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 * \name Blocked wait
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 * @{
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 */
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/**
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 * Block and wait until condition is true.
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 *
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 * This macro blocks the protothread until the specified condition is
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 * true.
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 *
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 * \param pt A pointer to the protothread control structure.
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 * \param condition The condition.
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 *
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 * \hideinitializer
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 */
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#define PT_WAIT_UNTIL(pt, condition)            \
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  do {                                          \
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    LC_SET((pt)->lc);                           \
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    if(!(condition)) {                          \
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      return PT_WAITING;                        \
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    }                                           \
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  } while(0)
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/**
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 * Block and wait while condition is true.
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 *
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 * This function blocks and waits while condition is true. See
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 * PT_WAIT_UNTIL().
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 *
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 * \param pt A pointer to the protothread control structure.
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 * \param cond The condition.
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 *
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 * \hideinitializer
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 */
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#define PT_WAIT_WHILE(pt, cond)  PT_WAIT_UNTIL((pt), !(cond))
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/** @} */
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/**
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 * \name Hierarchical protothreads
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 * @{
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 */
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/**
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 * Block and wait until a child protothread completes.
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 *
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 * This macro schedules a child protothread. The current protothread
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 * will block until the child protothread completes.
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 *
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 * \note The child protothread must be manually initialized with the
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 * PT_INIT() function before this function is used.
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 *
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 * \param pt A pointer to the protothread control structure.
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 * \param thread The child protothread with arguments
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 *
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 * \sa PT_SPAWN()
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 *
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 * \hideinitializer
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 */
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#define PT_WAIT_THREAD(pt, thread) PT_WAIT_WHILE((pt), PT_SCHEDULE(thread))
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/**
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 * Spawn a child protothread and wait until it exits.
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 *
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 * This macro spawns a child protothread and waits until it exits. The
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 * macro can only be used within a protothread.
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 *
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 * \param pt A pointer to the protothread control structure.
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 * \param child A pointer to the child protothread's control structure.
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 * \param thread The child protothread with arguments
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 *
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 * \hideinitializer
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 */
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#define PT_SPAWN(pt, child, thread)             \
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  do {                                          \
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    PT_INIT((child));                           \
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    PT_WAIT_THREAD((pt), (thread));             \
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  } while(0)
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/** @} */
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/**
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 * \name Exiting and restarting
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 * @{
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 */
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/**
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 * Restart the protothread.
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 *
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 * This macro will block and cause the running protothread to restart
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 * its execution at the place of the PT_BEGIN() call.
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 *
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 * \param pt A pointer to the protothread control structure.
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 *
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 * \hideinitializer
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 */
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#define PT_RESTART(pt)                          \
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  do {                                          \
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    PT_INIT(pt);                                \
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    return PT_WAITING;                  \
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  } while(0)
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/**
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 * Exit the protothread.
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 *
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 * This macro causes the protothread to exit. If the protothread was
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 * spawned by another protothread, the parent protothread will become
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 * unblocked and can continue to run.
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 *
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 * \param pt A pointer to the protothread control structure.
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 *
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 * \hideinitializer
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 */
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#define PT_EXIT(pt)                             \
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  do {                                          \
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    PT_INIT(pt);                                \
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    return PT_EXITED;                   \
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  } while(0)
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/** @} */
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/**
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 * \name Calling a protothread
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 * @{
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 */
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/**
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 * Schedule a protothread.
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 *
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 * This function shedules a protothread. The return value of the
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 * function is non-zero if the protothread is running or zero if the
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 * protothread has exited.
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 *
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 * \param f The call to the C function implementing the protothread to
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 * be scheduled
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 *
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 * \hideinitializer
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 */
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#define PT_SCHEDULE(f) ((f) == PT_WAITING)
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/** @} */
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/**
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 * \name Yielding from a protothread
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 * @{
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 */
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/**
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 * Yield from the current protothread.
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 *
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 * This function will yield the protothread, thereby allowing other
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 * processing to take place in the system.
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 *
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 * \param pt A pointer to the protothread control structure.
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 *
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 * \hideinitializer
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 */
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#define PT_YIELD(pt)                            \
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  do {                                          \
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    PT_YIELD_FLAG = 0;                           \
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    LC_SET((pt)->lc);                           \
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    if(PT_YIELD_FLAG == 0) {                     \
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      return PT_YIELDED;                        \
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    }                                           \
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  } while(0)
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/**
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 * \brief      Yield from the protothread until a condition occurs.
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 * \param pt   A pointer to the protothread control structure.
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 * \param cond The condition.
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 *
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 *             This function will yield the protothread, until the
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 *             specified condition evaluates to true.
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 *
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 *
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 * \hideinitializer
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 */
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#define PT_YIELD_UNTIL(pt, cond)                \
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  do {                                          \
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    PT_YIELD_FLAG = 0;                           \
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    LC_SET((pt)->lc);                           \
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    if((PT_YIELD_FLAG == 0) || !(cond)) {        \
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      return PT_YIELDED;                        \
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    }                                           \
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  } while(0)
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/** @} */
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#endif /* __PT_H__ */
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/** @} */

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