Ivo van Poorten / Mbed 2 deprecated opus-una

A Small Cooperative Multitasking Kernel

Dependencies:   mbed

timer-unix-c.h@0:73b89fc74e9f, 2011-07-24 (annotated)

Committer:
Ivop
Date:
Sun Jul 24 17:15:42 2011 +0000
Revision:
0:73b89fc74e9f
first release

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Ivop 0:73b89fc74e9f 1 /* Opus Una - A Small Cooperative Multitasking Kernel in C
Ivop 0:73b89fc74e9f 2 *
Ivop 0:73b89fc74e9f 3 * Copyright (C) 2011 by Ivo van Poorten <ivop@euronet.nl>
Ivop 0:73b89fc74e9f 4 * This file is licensed under the terms of the GNU Lesser
Ivop 0:73b89fc74e9f 5 * General Public License, version 3.
Ivop 0:73b89fc74e9f 6 */
Ivop 0:73b89fc74e9f 7
Ivop 0:73b89fc74e9f 8 /* Run the kernel as a process on Unix */
Ivop 0:73b89fc74e9f 9
Ivop 0:73b89fc74e9f 10 #include "timer.h"
Ivop 0:73b89fc74e9f 11 #include "kernel.h"
Ivop 0:73b89fc74e9f 12
Ivop 0:73b89fc74e9f 13 #include <sys/time.h>
Ivop 0:73b89fc74e9f 14 #include <signal.h>
Ivop 0:73b89fc74e9f 15 #include <string.h>
Ivop 0:73b89fc74e9f 16 #include <unistd.h>
Ivop 0:73b89fc74e9f 17
Ivop 0:73b89fc74e9f 18 static void timer_sr(int x) {
Ivop 0:73b89fc74e9f 19 ou_ticks++;
Ivop 0:73b89fc74e9f 20 ou_update_tasks();
Ivop 0:73b89fc74e9f 21 }
Ivop 0:73b89fc74e9f 22
Ivop 0:73b89fc74e9f 23 void ou_start_timer(void) {
Ivop 0:73b89fc74e9f 24 struct itimerval val;
Ivop 0:73b89fc74e9f 25 struct sigaction act;
Ivop 0:73b89fc74e9f 26
Ivop 0:73b89fc74e9f 27 memset(&act, 0, sizeof(act));
Ivop 0:73b89fc74e9f 28
Ivop 0:73b89fc74e9f 29 act.sa_handler = timer_sr;
Ivop 0:73b89fc74e9f 30 sigaction(SIGALRM, &act, NULL); // signal() is not portable
Ivop 0:73b89fc74e9f 31
Ivop 0:73b89fc74e9f 32 val.it_interval.tv_usec = 10000; // 10ms
Ivop 0:73b89fc74e9f 33 val.it_interval.tv_sec = 0;
Ivop 0:73b89fc74e9f 34 val.it_value.tv_usec = 10000; // 10ms
Ivop 0:73b89fc74e9f 35 val.it_value.tv_sec = 0;
Ivop 0:73b89fc74e9f 36 setitimer(ITIMER_REAL, &val, NULL);
Ivop 0:73b89fc74e9f 37 }
Ivop 0:73b89fc74e9f 38
Ivop 0:73b89fc74e9f 39 void ou_idle(void) {
Ivop 0:73b89fc74e9f 40 usleep(5); // save power/cpu time/et cetera...
Ivop 0:73b89fc74e9f 41 }