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Annotation of prex-old/usr/sample/balls/balls.c, Revision 1.1.1.1.2.1

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:
1.1.1.1.2.1! nbrk       30: /*
        !            31:  * ball.c - move many balls within screen.
        !            32:  */
        !            33:
1.1       nbrk       34: #include <prex/prex.h>
1.1.1.1.2.1! nbrk       35:
        !            36: #include <termios.h>
1.1       nbrk       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);
1.1.1.1.2.1! nbrk      114:        if (device_ioctl(cons, TIOCGWINSZ, &ws) == 0) {
1.1       nbrk      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: }