/[dtapublic]/projs/trunk/projs/20161106_kicker/c_main.c
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Contents of /projs/trunk/projs/20161106_kicker/c_main.c

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Revision 85 - (show annotations) (download)
Wed Nov 9 01:31:13 2016 UTC (7 years, 7 months ago) by dashley
File MIME type: text/plain
File size: 7947 byte(s)
Output and documentation cleanup.
1 //$Header$
2 //-------------------------------------------------------------------------------------------------
3 //This file is part of "kicker", a program for spawning threads periodically in order to
4 //unstall certain Windows programs and scripts. The cause of the stall is unknown, but
5 //it is known that spawning threads unstalls the system.
6 //-------------------------------------------------------------------------------------------------
7 //This source code and any program in which it is compiled/used is provided under the MIT License,
8 //reproduced below.
9 //-------------------------------------------------------------------------------------------------
10 //Permission is hereby granted, free of charge, to any person obtaining a copy of
11 //this software and associated documentation files(the "Software"), to deal in the
12 //Software without restriction, including without limitation the rights to use,
13 //copy, modify, merge, publish, distribute, sublicense, and / or sell copies of the
14 //Software, and to permit persons to whom the Software is furnished to do so,
15 //subject to the following conditions :
16 //
17 //The above copyright notice and this permission notice shall be included in all
18 //copies or substantial portions of the Software.
19 //
20 //THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
21 //IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
22 //FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.IN NO EVENT SHALL THE
23 //AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
24 //LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
25 //OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
26 //SOFTWARE.
27 //-------------------------------------------------------------------------------------------------
28 #include <process.h>
29 #include <stdio.h>
30 #include <string.h>
31 #include <windows.h>
32
33 #define NELEM(A) (sizeof(A)/sizeof(A[0]))
34
35 void emit_hline_std(void)
36 {
37 printf("-------------------------------------------------------------------------------\n");
38 }
39
40 void emit_mit_license(void)
41 {
42 const char *ref[] =
43 {
44 "Permission is hereby granted, free of charge, to any person obtaining a copy",
45 "of this software and associated documentation files(the \"Software\"), to",
46 "deal in the Software without restriction, including without limitation the",
47 "rights to use, copy, modify, merge, publish, distribute, sublicense, and / or",
48 "sell copies of the Software, and to permit persons to whom the Software is",
49 "furnished to do so, subject to the following conditions :",
50 "",
51 "The above copyright notice and this permission notice shall be included in",
52 "all copies or substantial portions of the Software.",
53 "",
54 "THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR",
55 "IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,",
56 "FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.IN NO EVENT SHALL THE",
57 "AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER",
58 "LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,",
59 "OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE",
60 "SOFTWARE."
61 };
62
63 size_t i;
64
65 for (i=0; i<NELEM(ref); i++)
66 {
67 printf("%s\n", ref[i]);
68 }
69 }
70
71 const char *kickish_words[] =
72 {
73 "Kick",
74 "Smack",
75 "Slug",
76 "Punch",
77 "Assault",
78 "Hit",
79 "Strike",
80 "Slap",
81 "Smack",
82 "Spank",
83 "Cuff",
84 "Thump",
85 "Swat",
86 "Beat",
87 "Thrash",
88 "Batter",
89 "Pound",
90 "Pummel",
91 "Box",
92 "Whip",
93 "Flog",
94 "Cane",
95 "Wallop",
96 "Bash",
97 "Bop",
98 "Clout",
99 "Clip",
100 "Clobber",
101 "Sock",
102 "Swipe",
103 "Crown",
104 "Belt",
105 "Tan",
106 "Deck",
107 "Floor",
108 "Bump",
109 "Knock",
110 "Bang",
111 "Tap",
112 "Welt"
113 };
114
115 volatile int ctrl_c_or_break_pressed = 0; //volatile because the Visual C++ environment spawns a thread to handle
116 //CTRL-C or CTRL-BREAK.
117 volatile int thread_ran = 0; //volatile because shared with thread.
118
119 BOOL CtrlHandler(DWORD fdwCtrlType)
120 {
121 switch (fdwCtrlType)
122 {
123 case CTRL_C_EVENT:
124 case CTRL_BREAK_EVENT:
125 ctrl_c_or_break_pressed = 1;
126 return(TRUE);
127 //There is no default case. There is no break statement. I've assigned a
128 //magic number to a variable. But the function still works fine.
129 //Can you believe it? It must be a miracle!
130 }
131
132 return(FALSE); //Did I mention the multiple return points? This program should
133 //blow up and wipe out several city blocks!
134 }
135
136 //Thread function. Parameter ignored.
137 DWORD WINAPI MyThreadFunction(LPVOID lpParam)
138 {
139 thread_ran = 1;
140
141 return (0);
142 }
143
144 int c_main(int argc, char* argv[])
145 {
146 size_t selector = NELEM(kickish_words) - 1;
147 size_t ui;
148 int first_time = 1;
149 HANDLE thread_handle;
150 DWORD thread_id;
151
152 emit_hline_std();
153 printf("kicker, Copyright 2016 David T. Ashley (dashley@gmail.com)\n");
154 emit_hline_std();
155 printf("This program is made available under the MIT License, reproduced below.\n");
156 emit_hline_std();
157 emit_mit_license();
158 emit_hline_std();
159 printf("This program accepts no command-line arguments and simply spawns a new thread\n");
160 printf("approximately every 1 second. The purpose of the program is to prevent\n");
161 printf("certain stalls that occur under Windows when running some programs/scripts\n");
162 printf("It is known that spawning a new thread periodically unstalls the programs/\n");
163 printf("scripts. The program can be terminated with CTRL-C or CTRL-BREAK.\n");
164 emit_hline_std();
165
166 SetConsoleCtrlHandler((PHANDLER_ROUTINE)CtrlHandler, TRUE);
167 //Yes, I know I'm supposed to check the return code.
168
169 while (! ctrl_c_or_break_pressed)
170 {
171 //Backspace over the previous word.
172 if (! first_time)
173 {
174 //Beep(750, 500);
175
176 for (ui = 0; ui < (strlen(kickish_words[selector]) + 1); ui++)
177 {
178 printf("%c", (char)8);
179 }
180 for (ui = 0; ui < (strlen(kickish_words[selector]) + 1); ui++)
181 {
182 printf(" ");
183 }
184 for (ui = 0; ui < (strlen(kickish_words[selector]) + 1); ui++)
185 {
186 printf("%c", (char)8);
187 }
188 }
189
190 first_time = 0;
191
192 //Go to next string.
193 if (selector < (NELEM(kickish_words) - 1))
194 selector++;
195 else
196 selector = 0;
197
198 //Print the description.
199 printf("%s!", kickish_words[selector]);
200
201 //Start the thread. This will hopefully unstall things.
202 thread_handle = CreateThread(
203 NULL, // default security attributes
204 0, // use default stack size
205 MyThreadFunction, // thread function name
206 0, // argument to thread function
207 0, // use default creation flags
208 &thread_id); // returns the thread identifier
209
210 //If the create call failed, terminate.
211 if (thread_handle == NULL)
212 {
213 printf("\nOuch!\n");
214 exit(0);
215 }
216
217 //Wait for thread termination. This should be nearly instant. But it
218 //would seem to be the best way to wait so as not to chew up CPU
219 //cycles.
220 WaitForSingleObject(thread_handle, INFINITE);
221
222 //At this point, the thread should have run, and the variable should have been
223 //set. If not, there is a real logical problem.
224 if (!thread_ran)
225 {
226 printf("\nDouble-ouch\n");
227 exit(0);
228 }
229
230 thread_ran = 0;
231
232 //Delay. Sleep() is likely the most effective way to not waste CPU capacity.
233 Sleep(1000);
234 }
235
236 printf("\n");
237 emit_hline_std();
238 printf("Program terminated with CTRL-C or CTRL-BREAK.\n");
239 emit_hline_std();
240
241 return(0);
242 }
243
244 // End of c_main.c.

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