/platform/cooja/sys/cooja_mt.c
C | 107 lines | 49 code | 5 blank | 53 comment | 3 complexity | 7b4e795830e368bd8e697222334ca049 MD5 | raw file
- /*
- * Copyright (c) 2004, 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>
- *
- * $Id: cooja_mt.c,v 1.1 2006/09/29 14:32:38 fros4943 Exp $
- */
- /*
- * This file is ripped from mt.c of the Contiki Multi-threading library.
- * Fredrik Osterlind <fros@sics.se>
- */
- #include "contiki.h"
- #include "sys/cooja_mt.h"
- #include "sys/cc.h"
- #define MT_STATE_READY 1
- #define MT_STATE_RUNNING 2
- #define MT_STATE_WAITING 3
- #define MT_STATE_PEEK 4
- #define MT_STATE_EXITED 5
- static struct cooja_mt_thread *current;
- /*--------------------------------------------------------------------------*/
- void
- cooja_mt_init(void)
- {
- cooja_mtarch_init();
- }
- /*--------------------------------------------------------------------------*/
- void
- cooja_mt_remove(void)
- {
- cooja_mtarch_remove();
- }
- /*--------------------------------------------------------------------------*/
- void
- cooja_mt_start(struct cooja_mt_thread *thread, void (* function)(void *), void *data)
- {
- /* Call the architecture dependant function to set up the processor
- stack with the correct parameters. */
- cooja_mtarch_start(&thread->thread, function, data);
- thread->state = MT_STATE_READY;
- }
- /*--------------------------------------------------------------------------*/
- void
- cooja_mt_exec(struct cooja_mt_thread *thread)
- {
- if(thread->state == MT_STATE_READY ||
- thread->state == MT_STATE_PEEK) {
- thread->state = MT_STATE_RUNNING;
- current = thread;
- /* Switch context to the thread. The function call will not return
- until the the thread has yielded, or is preempted. */
- /*printf("swtis\n");*/
- cooja_mtarch_exec(&thread->thread);
- }
- }
- /*--------------------------------------------------------------------------*/
- void
- cooja_mt_exit(void)
- {
- current->state = MT_STATE_EXITED;
- current = NULL;
- cooja_mtarch_yield();
- }
- /*--------------------------------------------------------------------------*/
- void
- cooja_mt_yield(void)
- {
- current->state = MT_STATE_READY;
- current = NULL;
- /* This function is called from the running thread, and we call the
- switch function in order to switch the thread to the main Contiki
- program instead. For us, the switch function will not return
- until the next time we are scheduled to run. */
- cooja_mtarch_yield();
- }