scoutos / prex-0.9.0 / usr / sample / balls / balls.c @ 03e9c04a
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/*
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* Copyright (c) 2007, Kohsuke Ohtani
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the author nor the names of any co-contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* ball.c - move many balls within screen.
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*/
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#include <sys/prex.h> |
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#include <termios.h> |
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#include <stdio.h> |
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#include <stdlib.h> |
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#define NBALLS 30 |
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#define STACKLEN 512 |
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/* Screen size */
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static int max_x; |
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static int max_y; |
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static char stack[NBALLS][STACKLEN]; |
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static thread_t
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thread_run(void (*start)(void), char *stack) |
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{ |
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thread_t t; |
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if (thread_create(task_self(), &t) != 0) |
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return 0; |
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if (thread_load(t, start, stack) != 0) |
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return 0; |
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if (thread_resume(t) != 0) |
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return 0; |
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return t;
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} |
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/*
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* A thread to move one ball.
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*/
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static void |
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move_ball(void)
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{ |
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int x, y;
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int delta_x, delta_y;
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int old_x, old_y;
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u_long wait_msec; |
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/* Get random value for moving speed. */
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old_x = old_y = 0;
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x = random() % max_x; |
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y = random() % max_y; |
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delta_x = (random() % 10) + 1; |
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delta_y = (random() % 10) + 1; |
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wait_msec = (u_long)((random() % 20) + 1); |
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for (;;) {
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/* Erase ball at old position */
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printf("\33[%d;%dH ", old_y / 10, old_x / 10); |
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/* Print ball at new position */
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printf("\33[%d;%dH*", y / 10, x / 10); |
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/* Wait msec */
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timer_sleep(wait_msec, 0);
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/* Update position */
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old_x = x; |
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old_y = y; |
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x += delta_x; |
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y += delta_y; |
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if (x < 10 || x >= max_x) |
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delta_x = -delta_x; |
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if (y < 10 || y >= max_y) |
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delta_y = -delta_y; |
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} |
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/* NOTREACHED */
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} |
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int
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main(int argc, char *argv[]) |
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{ |
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struct winsize ws;
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int rows, cols, i;
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device_t cons; |
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/* Get screen size */
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device_open("tty", 0, &cons); |
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if (device_ioctl(cons, TIOCGWINSZ, &ws) == 0) { |
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rows = (int)ws.ws_row;
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cols = (int)ws.ws_col;
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} else {
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/* Use default screen setting */
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rows = 25;
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cols = 80;
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} |
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device_close(cons); |
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max_x = (cols - 1) * 10; |
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max_y = (rows - 2) * 10; |
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/* Clear screen */
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printf("\33[2J");
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/* Create threads and run them. */
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for (i = 0; i < NBALLS; i++) { |
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if (thread_run(move_ball, stack[i]+STACKLEN) == 0) |
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panic("failed to create thread");
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} |
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/* Don't return */
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for (;;)
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thread_yield(); |
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/* NOTREACHED */
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return 0; |
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} |