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Annotation of prex-old/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: #include <prex/prex.h>
        !            31: #include <sys/ioctl.h>
        !            32: #include <stdio.h>
        !            33: #include <stdlib.h>
        !            34:
        !            35: #define NBALLS         30
        !            36: #define STACKLEN       512
        !            37:
        !            38: /* Screen size */
        !            39: static int max_x;
        !            40: static int max_y;
        !            41:
        !            42: static char stack[NBALLS][STACKLEN];
        !            43:
        !            44: static thread_t
        !            45: thread_run(void (*start)(void), char *stack)
        !            46: {
        !            47:        thread_t th;
        !            48:
        !            49:        if (thread_create(task_self(), &th) != 0)
        !            50:                return 0;
        !            51:        if (thread_load(th, start, stack) != 0)
        !            52:                return 0;
        !            53:        if (thread_resume(th) != 0)
        !            54:                return 0;
        !            55:        return th;
        !            56: }
        !            57:
        !            58: /*
        !            59:  * A thread to move one ball.
        !            60:  */
        !            61: static void
        !            62: move_ball(void)
        !            63: {
        !            64:        int x, y;
        !            65:        int delta_x, delta_y;
        !            66:        int old_x, old_y;
        !            67:        int color;
        !            68:
        !            69:        /* Get random value for moving speed. */
        !            70:        old_x = old_y = 0;
        !            71:        color = 31 + (random() % 7);
        !            72:        x = random() % max_x;
        !            73:        y = random() % max_y;
        !            74:        delta_x = (random() % 10) + 1;
        !            75:        delta_y = (random() % 10) + 1;
        !            76:
        !            77:        for (;;) {
        !            78:                /* Erase ball at old position */
        !            79:                printf("\33[%d;%dH ", old_y / 10, old_x / 10);
        !            80:
        !            81:                /* Print ball at new position */
        !            82:                printf("\33[%d;%dH\033[%dm*", y / 10, x / 10, color);
        !            83:
        !            84:                /* Wait 5ms */
        !            85:                timer_sleep(5, 0);
        !            86:
        !            87:                /* Update position */
        !            88:                old_x = x;
        !            89:                old_y = y;
        !            90:                x += delta_x;
        !            91:                y += delta_y;
        !            92:                if (x < 10 || x >= max_x)
        !            93:                        delta_x = -delta_x;
        !            94:                if (y < 10 || y >= max_y)
        !            95:                        delta_y = -delta_y;
        !            96:        }
        !            97:        /* NOTREACHED */
        !            98: }
        !            99:
        !           100: int
        !           101: main(int argc, char *argv[])
        !           102: {
        !           103:        struct winsize ws;
        !           104:        int rows, cols, i;
        !           105:        device_t cons;
        !           106:
        !           107:        /* Get screen size */
        !           108:        device_open("console", 0, &cons);
        !           109:        if (device_ioctl(cons, TIOCGWINSZ, (u_long)&ws) == 0) {
        !           110:                rows = ws.ws_row;
        !           111:                cols = ws.ws_col;
        !           112:        } else {
        !           113:                /* Use default screen setting */
        !           114:                rows = 25;
        !           115:                cols = 80;
        !           116:        }
        !           117:        device_close(cons);
        !           118:
        !           119:        max_x = (cols - 1) * 10;
        !           120:        max_y = (rows - 2) * 10;
        !           121:
        !           122:        /* Clear screen */
        !           123:        printf("\33[2J");
        !           124:
        !           125:        /* Create threads and run them. */
        !           126:        for (i = 0; i < NBALLS; i++) {
        !           127:                if (thread_run(move_ball, stack[i]+STACKLEN) == 0)
        !           128:                        panic("failed to create thread");
        !           129:        }
        !           130:
        !           131:        /* Don't return */
        !           132:        for (;;);
        !           133:        /* NOTREACHED */
        !           134:        return 0;
        !           135: }