Contiki 2.6
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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 /*---------------------------------------------------------------------------*/