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Annotation of prex-old/usr/sample/balls/balls.c, Revision 1.1.1.1

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: }