Contiki 2.6

rtimer-arch.c

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00001 /*
00002  * Copyright (c) 2007, Swedish Institute of Computer Science.
00003  * All rights reserved.
00004  *
00005  * Redistribution and use in source and binary forms, with or without
00006  * modification, are permitted provided that the following conditions
00007  * are met:
00008  * 1. Redistributions of source code must retain the above copyright
00009  *    notice, this list of conditions and the following disclaimer.
00010  * 2. Redistributions in binary form must reproduce the above copyright
00011  *    notice, this list of conditions and the following disclaimer in the
00012  *    documentation and/or other materials provided with the distribution.
00013  * 3. Neither the name of the Institute nor the names of its contributors
00014  *    may be used to endorse or promote products derived from this software
00015  *    without specific prior written permission.
00016  *
00017  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
00018  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
00019  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
00020  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
00021  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
00022  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
00023  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
00024  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
00025  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
00026  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
00027  * SUCH DAMAGE.
00028  *
00029  * This file is part of the Contiki operating system.
00030  *
00031  * $Id: rtimer-arch.c,v 1.3 2008/02/09 14:02:12 oliverschmidt Exp $
00032  */
00033 
00034 /**
00035  * \file
00036  *         Native (non-specific) code for the Contiki real-time module rt
00037  * \author
00038  *         Adam Dunkels <adam@sics.se>
00039  */
00040 
00041 #include <signal.h>
00042 #ifndef _WIN32
00043 #include <sys/time.h>
00044 #endif /* !_WIN32 */
00045 #include <stddef.h>
00046 
00047 #include "sys/rtimer.h"
00048 #include "sys/clock.h"
00049 
00050 #define DEBUG 0
00051 #if DEBUG
00052 #include <stdio.h>
00053 #define PRINTF(...) printf(__VA_ARGS__)
00054 #else
00055 #define PRINTF(...)
00056 #endif
00057 
00058 /*---------------------------------------------------------------------------*/
00059 static void
00060 interrupt(int sig)
00061 {
00062   signal(sig, interrupt);
00063   rtimer_run_next();
00064 }
00065 /*---------------------------------------------------------------------------*/
00066 void
00067 rtimer_arch_init(void)
00068 {
00069 #ifndef _WIN32
00070   signal(SIGALRM, interrupt);
00071 #endif /* !_WIN32 */
00072 }
00073 /*---------------------------------------------------------------------------*/
00074 void
00075 rtimer_arch_schedule(rtimer_clock_t t)
00076 {
00077 #ifndef _WIN32
00078   struct itimerval val;
00079   rtimer_clock_t c;
00080 
00081   c = t - (unsigned short)clock_time();
00082   
00083   val.it_value.tv_sec = c / 1000;
00084   val.it_value.tv_usec = (c % 1000) * 1000;
00085 
00086   PRINTF("rtimer_arch_schedule time %u %u in %d.%d seconds\n", t, c, c / 1000,
00087          (c % 1000) * 1000);
00088 
00089   val.it_interval.tv_sec = val.it_interval.tv_usec = 0;
00090   setitimer(ITIMER_REAL, &val, NULL);
00091 #endif /* !_WIN32 */
00092 }
00093 /*---------------------------------------------------------------------------*/