root / prex-0.9.0 / usr / sample / balls / balls.c @ 03e9c04a
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1 | 03e9c04a | Brad Neuman | /*
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2 | * Copyright (c) 2007, Kohsuke Ohtani
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3 | * All rights reserved.
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4 | *
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5 | * Redistribution and use in source and binary forms, with or without
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6 | * modification, are permitted provided that the following conditions
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7 | * are met:
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8 | * 1. Redistributions of source code must retain the above copyright
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9 | * notice, this list of conditions and the following disclaimer.
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10 | * 2. Redistributions in binary form must reproduce the above copyright
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11 | * notice, this list of conditions and the following disclaimer in the
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12 | * documentation and/or other materials provided with the distribution.
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13 | * 3. Neither the name of the author nor the names of any co-contributors
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14 | * may be used to endorse or promote products derived from this software
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15 | * without specific prior written permission.
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16 | *
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17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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18 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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19 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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20 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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21 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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22 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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23 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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24 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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25 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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26 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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27 | * SUCH DAMAGE.
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28 | */
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29 | |||
30 | /*
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31 | * ball.c - move many balls within screen.
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32 | */
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33 | |||
34 | #include <sys/prex.h> |
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35 | |||
36 | #include <termios.h> |
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37 | #include <stdio.h> |
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38 | #include <stdlib.h> |
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39 | |||
40 | #define NBALLS 30 |
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41 | #define STACKLEN 512 |
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42 | |||
43 | /* Screen size */
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44 | static int max_x; |
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45 | static int max_y; |
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46 | |||
47 | static char stack[NBALLS][STACKLEN]; |
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48 | |||
49 | static thread_t
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50 | thread_run(void (*start)(void), char *stack) |
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51 | { |
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52 | thread_t t; |
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53 | |||
54 | if (thread_create(task_self(), &t) != 0) |
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55 | return 0; |
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56 | if (thread_load(t, start, stack) != 0) |
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57 | return 0; |
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58 | if (thread_resume(t) != 0) |
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59 | return 0; |
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60 | return t;
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61 | } |
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62 | |||
63 | /*
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64 | * A thread to move one ball.
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65 | */
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66 | static void |
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67 | move_ball(void)
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68 | { |
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69 | int x, y;
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70 | int delta_x, delta_y;
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71 | int old_x, old_y;
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72 | u_long wait_msec; |
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73 | |||
74 | /* Get random value for moving speed. */
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75 | old_x = old_y = 0;
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76 | x = random() % max_x; |
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77 | y = random() % max_y; |
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78 | delta_x = (random() % 10) + 1; |
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79 | delta_y = (random() % 10) + 1; |
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80 | wait_msec = (u_long)((random() % 20) + 1); |
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81 | |||
82 | for (;;) {
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83 | /* Erase ball at old position */
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84 | printf("\33[%d;%dH ", old_y / 10, old_x / 10); |
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85 | |||
86 | /* Print ball at new position */
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87 | printf("\33[%d;%dH*", y / 10, x / 10); |
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88 | |||
89 | /* Wait msec */
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90 | timer_sleep(wait_msec, 0);
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91 | |||
92 | /* Update position */
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93 | old_x = x; |
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94 | old_y = y; |
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95 | x += delta_x; |
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96 | y += delta_y; |
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97 | if (x < 10 || x >= max_x) |
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98 | delta_x = -delta_x; |
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99 | if (y < 10 || y >= max_y) |
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100 | delta_y = -delta_y; |
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101 | } |
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102 | /* NOTREACHED */
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103 | } |
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104 | |||
105 | int
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106 | main(int argc, char *argv[]) |
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107 | { |
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108 | struct winsize ws;
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109 | int rows, cols, i;
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110 | device_t cons; |
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111 | |||
112 | /* Get screen size */
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113 | device_open("tty", 0, &cons); |
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114 | if (device_ioctl(cons, TIOCGWINSZ, &ws) == 0) { |
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115 | rows = (int)ws.ws_row;
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116 | cols = (int)ws.ws_col;
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117 | } else {
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118 | /* Use default screen setting */
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119 | rows = 25;
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120 | cols = 80;
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121 | } |
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122 | device_close(cons); |
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123 | |||
124 | max_x = (cols - 1) * 10; |
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125 | max_y = (rows - 2) * 10; |
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126 | |||
127 | /* Clear screen */
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128 | printf("\33[2J");
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129 | |||
130 | /* Create threads and run them. */
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131 | for (i = 0; i < NBALLS; i++) { |
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132 | if (thread_run(move_ball, stack[i]+STACKLEN) == 0) |
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133 | panic("failed to create thread");
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134 | } |
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135 | |||
136 | /* Don't return */
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137 | for (;;)
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138 | thread_yield(); |
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139 | |||
140 | /* NOTREACHED */
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141 | return 0; |
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142 | } |