contiki/examples/multi-threading/multi-threading.c

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/*
* Copyright (c) 2007, 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: Oliver Schmidt <ol.sc@web.de>
*
* $Id: multi-threading.c,v 1.4 2008/05/26 09:12:22 oliverschmidt Exp $
*/
/**
* \file
* A very simple Contiki application showing how to use the Contiki
* Multi-threading library
* \author
* Oliver Schmidt <ol.sc@web.de>
*/
/* The Contiki Multi-threading library is on Windows implemented using
* Win32 fibers. The Cygwin C-library implements Thread-Local-Storage
* in a way that is incompatible with fibers. Therefore most Cygwin
* C-library functions don't work when called from a Contiki thread. */
#include "contiki.h"
#include "sys/log.h"
#include "sys/mt.h"
static char *ptr;
PROCESS(multi_threading_process, "Multi-threading process");
AUTOSTART_PROCESSES(&multi_threading_process);
/*---------------------------------------------------------------------------*/
static void
thread_func(char *str, int len)
{
ptr = str + len;
mt_yield();
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if(len) {
thread_func(str, len - 1);
mt_yield();
}
ptr = str + len;
}
/*---------------------------------------------------------------------------*/
static void
thread_main(void *data)
{
while(1) {
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thread_func((char *)data, 9);
}
mt_exit();
}
/*---------------------------------------------------------------------------*/
PROCESS_THREAD(multi_threading_process, ev, data)
{
static struct mt_thread alpha_thread;
static struct mt_thread count_thread;
static struct etimer timer;
static int toggle;
PROCESS_BEGIN();
mt_init();
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mt_start(&alpha_thread, thread_main, "JIHGFEDCBA");
mt_start(&count_thread, thread_main, "9876543210");
etimer_set(&timer, CLOCK_SECOND / 2);
while(1) {
PROCESS_WAIT_EVENT();
if(ev == PROCESS_EVENT_TIMER) {
if(toggle) {
mt_exec(&alpha_thread);
toggle--;
} else {
mt_exec(&count_thread);
toggle++;
}
log_message(ptr, "");
etimer_set(&timer, CLOCK_SECOND / 2);
}
}
mt_stop(&alpha_thread);
mt_stop(&count_thread);
mt_remove();
PROCESS_END();
}
/*---------------------------------------------------------------------------*/