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Annotation of prex/usr/sample/balls/balls.c, Revision 1.1

1.1     ! nbrk        1: /*
        !             2:  * Copyright (c) 2007, Kohsuke Ohtani
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * Redistribution and use in source and binary forms, with or without
        !             6:  * modification, are permitted provided that the following conditions
        !             7:  * are met:
        !             8:  * 1. Redistributions of source code must retain the above copyright
        !             9:  *    notice, this list of conditions and the following disclaimer.
        !            10:  * 2. Redistributions in binary form must reproduce the above copyright
        !            11:  *    notice, this list of conditions and the following disclaimer in the
        !            12:  *    documentation and/or other materials provided with the distribution.
        !            13:  * 3. Neither the name of the author nor the names of any co-contributors
        !            14:  *    may be used to endorse or promote products derived from this software
        !            15:  *    without specific prior written permission.
        !            16:  *
        !            17:  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
        !            18:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            19:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            20:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
        !            21:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            22:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            23:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            24:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            25:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            26:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            27:  * SUCH DAMAGE.
        !            28:  */
        !            29:
        !            30: /*
        !            31:  * ball.c - move many balls within screen.
        !            32:  */
        !            33:
        !            34: #include <prex/prex.h>
        !            35:
        !            36: #include <termios.h>
        !            37: #include <stdio.h>
        !            38: #include <stdlib.h>
        !            39:
        !            40: #define NBALLS         30
        !            41: #define STACKLEN       512
        !            42:
        !            43: /* Screen size */
        !            44: static int max_x;
        !            45: static int max_y;
        !            46:
        !            47: static char stack[NBALLS][STACKLEN];
        !            48:
        !            49: static thread_t
        !            50: thread_run(void (*start)(void), char *stack)
        !            51: {
        !            52:        thread_t th;
        !            53:
        !            54:        if (thread_create(task_self(), &th) != 0)
        !            55:                return 0;
        !            56:        if (thread_load(th, start, stack) != 0)
        !            57:                return 0;
        !            58:        if (thread_resume(th) != 0)
        !            59:                return 0;
        !            60:        return th;
        !            61: }
        !            62:
        !            63: /*
        !            64:  * A thread to move one ball.
        !            65:  */
        !            66: static void
        !            67: move_ball(void)
        !            68: {
        !            69:        int x, y;
        !            70:        int delta_x, delta_y;
        !            71:        int old_x, old_y;
        !            72:        int color;
        !            73:
        !            74:        /* Get random value for moving speed. */
        !            75:        old_x = old_y = 0;
        !            76:        color = 31 + (random() % 7);
        !            77:        x = random() % max_x;
        !            78:        y = random() % max_y;
        !            79:        delta_x = (random() % 10) + 1;
        !            80:        delta_y = (random() % 10) + 1;
        !            81:
        !            82:        for (;;) {
        !            83:                /* Erase ball at old position */
        !            84:                printf("\33[%d;%dH ", old_y / 10, old_x / 10);
        !            85:
        !            86:                /* Print ball at new position */
        !            87:                printf("\33[%d;%dH\033[%dm*", y / 10, x / 10, color);
        !            88:
        !            89:                /* Wait 5ms */
        !            90:                timer_sleep(5, 0);
        !            91:
        !            92:                /* Update position */
        !            93:                old_x = x;
        !            94:                old_y = y;
        !            95:                x += delta_x;
        !            96:                y += delta_y;
        !            97:                if (x < 10 || x >= max_x)
        !            98:                        delta_x = -delta_x;
        !            99:                if (y < 10 || y >= max_y)
        !           100:                        delta_y = -delta_y;
        !           101:        }
        !           102:        /* NOTREACHED */
        !           103: }
        !           104:
        !           105: int
        !           106: main(int argc, char *argv[])
        !           107: {
        !           108:        struct winsize ws;
        !           109:        int rows, cols, i;
        !           110:        device_t cons;
        !           111:
        !           112:        /* Get screen size */
        !           113:        device_open("console", 0, &cons);
        !           114:        if (device_ioctl(cons, TIOCGWINSZ, &ws) == 0) {
        !           115:                rows = ws.ws_row;
        !           116:                cols = ws.ws_col;
        !           117:        } else {
        !           118:                /* Use default screen setting */
        !           119:                rows = 25;
        !           120:                cols = 80;
        !           121:        }
        !           122:        device_close(cons);
        !           123:
        !           124:        max_x = (cols - 1) * 10;
        !           125:        max_y = (rows - 2) * 10;
        !           126:
        !           127:        /* Clear screen */
        !           128:        printf("\33[2J");
        !           129:
        !           130:        /* Create threads and run them. */
        !           131:        for (i = 0; i < NBALLS; i++) {
        !           132:                if (thread_run(move_ball, stack[i]+STACKLEN) == 0)
        !           133:                        panic("failed to create thread");
        !           134:        }
        !           135:
        !           136:        /* Don't return */
        !           137:        for (;;);
        !           138:        /* NOTREACHED */
        !           139:        return 0;
        !           140: }