File: [local] / prex / usr / sample / balls / balls.c (download)
Revision 1.1.1.1 (vendor branch), Tue Aug 19 12:47:01 2008 UTC (15 years, 10 months ago) by nbrk
Branch: MAIN, KOHSUKE
CVS Tags: PREX_0_8_BASE, HEAD Changes since 1.1: +0 -0 lines
Initial import of Prex, Portable Real-time Embedded POSIX microkernel system.
I have totally new directions in my development (more focused on real hardware, not virtual one).
Old hacks are available in prex-old module. They will be carefully re-designed and merged soon.
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/*
* Copyright (c) 2007, Kohsuke Ohtani
* 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 author nor the names of any co-contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
*/
/*
* ball.c - move many balls within screen.
*/
#include <prex/prex.h>
#include <termios.h>
#include <stdio.h>
#include <stdlib.h>
#define NBALLS 30
#define STACKLEN 512
/* Screen size */
static int max_x;
static int max_y;
static char stack[NBALLS][STACKLEN];
static thread_t
thread_run(void (*start)(void), char *stack)
{
thread_t th;
if (thread_create(task_self(), &th) != 0)
return 0;
if (thread_load(th, start, stack) != 0)
return 0;
if (thread_resume(th) != 0)
return 0;
return th;
}
/*
* A thread to move one ball.
*/
static void
move_ball(void)
{
int x, y;
int delta_x, delta_y;
int old_x, old_y;
int color;
/* Get random value for moving speed. */
old_x = old_y = 0;
color = 31 + (random() % 7);
x = random() % max_x;
y = random() % max_y;
delta_x = (random() % 10) + 1;
delta_y = (random() % 10) + 1;
for (;;) {
/* Erase ball at old position */
printf("\33[%d;%dH ", old_y / 10, old_x / 10);
/* Print ball at new position */
printf("\33[%d;%dH\033[%dm*", y / 10, x / 10, color);
/* Wait 5ms */
timer_sleep(5, 0);
/* Update position */
old_x = x;
old_y = y;
x += delta_x;
y += delta_y;
if (x < 10 || x >= max_x)
delta_x = -delta_x;
if (y < 10 || y >= max_y)
delta_y = -delta_y;
}
/* NOTREACHED */
}
int
main(int argc, char *argv[])
{
struct winsize ws;
int rows, cols, i;
device_t cons;
/* Get screen size */
device_open("console", 0, &cons);
if (device_ioctl(cons, TIOCGWINSZ, &ws) == 0) {
rows = ws.ws_row;
cols = ws.ws_col;
} else {
/* Use default screen setting */
rows = 25;
cols = 80;
}
device_close(cons);
max_x = (cols - 1) * 10;
max_y = (rows - 2) * 10;
/* Clear screen */
printf("\33[2J");
/* Create threads and run them. */
for (i = 0; i < NBALLS; i++) {
if (thread_run(move_ball, stack[i]+STACKLEN) == 0)
panic("failed to create thread");
}
/* Don't return */
for (;;);
/* NOTREACHED */
return 0;
}