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: }
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