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: }
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