/[dtapublic]/projs/trunk/projs/20161106_kicker/c_main.c
ViewVC logotype

Contents of /projs/trunk/projs/20161106_kicker/c_main.c

Parent Directory Parent Directory | Revision Log Revision Log


Revision 79 - (show annotations) (download)
Mon Nov 7 17:06:44 2016 UTC (7 years, 8 months ago) by dashley
File MIME type: text/plain
File size: 8039 byte(s)
Test version complete.  The open issue is whether starting a thread will
solve the problem, or whether spawning a process will be necessary.
1 //$Header$
2 //-------------------------------------------------------------------------------------------------
3 //This file is part of "kicker", a program for spawning threads and/or processes periodically in
4 //order to unstall certain Windows programs and scripts. The cause of the stall is unknown, but
5 //it is known that spawning threads and/or processes 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 <assert.h>
29 #include <malloc.h>
30 #include <process.h>
31 #include <stdio.h>
32 #include <string.h>
33 #include <time.h>
34 #include <windows.h>
35
36 #define NELEM(A) (sizeof(A)/sizeof(A[0]))
37
38 void emit_hline_std(void)
39 {
40 printf("----------------------------------------------------------------------------------\n");
41 }
42
43 void emit_mit_license(void)
44 {
45 const char *ref[] =
46 {
47 "Permission is hereby granted, free of charge, to any person obtaining a copy of",
48 "this software and associated documentation files(the \"Software\"), to deal in the",
49 "Software without restriction, including without limitation the rights to use,",
50 "copy, modify, merge, publish, distribute, sublicense, and / or sell copies of the",
51 "Software, and to permit persons to whom the Software is furnished to do so,",
52 "subject to the following conditions :",
53 "",
54 "The above copyright notice and this permission notice shall be included in all",
55 "copies or substantial portions of the Software.",
56 "",
57 "THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR",
58 "IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,",
59 "FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.IN NO EVENT SHALL THE",
60 "AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER",
61 "LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,",
62 "OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE",
63 "SOFTWARE."
64 };
65
66 size_t i;
67
68 for (i=0; i<NELEM(ref); i++)
69 {
70 printf("%s\n", ref[i]);
71 }
72 }
73
74 const char *kickish_words[] =
75 {
76 "Kick",
77 "Smack",
78 "Slug",
79 "Punch",
80 "Assault",
81 "Hit",
82 "Strike",
83 "Slap",
84 "Smack",
85 "Spank",
86 "Cuff",
87 "Thump",
88 "Swat",
89 "Beat",
90 "Thrash",
91 "Batter",
92 "Pound",
93 "Pummel",
94 "Box",
95 "Whip",
96 "Flog",
97 "Cane",
98 "Wallop",
99 "Bash",
100 "Bop",
101 "Clout",
102 "Clip",
103 "Clobber",
104 "Sock",
105 "Swipe",
106 "Crown",
107 "Belt",
108 "Tan",
109 "Deck",
110 "Floor",
111 "Bump",
112 "Knock",
113 "Bang",
114 "Tap",
115 "Welt"
116 };
117
118 volatile int ctrl_c_or_break_pressed = 0; //volatile because the Visual C++ environment spawns a thread to handle
119 //CTRL-C or CTRL-BREAK.
120 volatile int thread_ran = 0; //volatile because shared with thread.
121
122
123 BOOL CtrlHandler(DWORD fdwCtrlType)
124 {
125 switch (fdwCtrlType)
126 {
127 case CTRL_C_EVENT:
128 case CTRL_BREAK_EVENT:
129 ctrl_c_or_break_pressed = 1;
130 return(TRUE);
131 //There is no default case. There is no break statement. I've assigned a
132 //magic number to a variable. But the function still works fine.
133 //Can you believe it? It must be a miracle!
134 }
135
136 return(FALSE); //Did I mention the multiple return points? This program should
137 //blow up and wipe out several city blocks!
138 }
139
140
141 //Thread function. Parameter ignored.
142 DWORD WINAPI MyThreadFunction(LPVOID lpParam)
143 {
144 thread_ran = 1;
145
146 return (0);
147 }
148
149
150 int c_main(int argc, char* argv[])
151 {
152 size_t selector = NELEM(kickish_words) - 1;
153 size_t ui;
154 int first_time = 1;
155 HANDLE thread_handle;
156 DWORD thread_id;
157
158 emit_hline_std();
159 printf("kicker, Copyright 2016 David T. Ashley (dashley@gmail.com)\n");
160 emit_hline_std();
161 printf("This program is provided under the MIT License, reproduced below.\n");
162 emit_hline_std();
163 emit_mit_license();
164 emit_hline_std();
165 printf("This program accepts no command-line arguments and simply spawns a new thread\n");
166 printf("approximately every 1 second. The purpose of the program is to prevent\n");
167 printf("certain stalls that occur under Windows when running some programs/scripts\n");
168 printf("It is known that spawning a new thread periodically unstalls the programs/\n");
169 printf("scripts. The program can be terminated with CTRL-C or CTRL-BREAK.\n");
170 emit_hline_std();
171
172 SetConsoleCtrlHandler((PHANDLER_ROUTINE)CtrlHandler, TRUE);
173 //Yes, I know I'm supposed to check the return code.
174
175 while (! ctrl_c_or_break_pressed)
176 {
177 //Backspace over the previous word.
178 if (! first_time)
179 {
180 //Beep(750, 500);
181
182 for (ui = 0; ui < (strlen(kickish_words[selector]) + 1); ui++)
183 {
184 printf("%c", (char)8);
185 }
186 for (ui = 0; ui < (strlen(kickish_words[selector]) + 1); ui++)
187 {
188 printf(" ");
189 }
190 for (ui = 0; ui < (strlen(kickish_words[selector]) + 1); ui++)
191 {
192 printf("%c", (char)8);
193 }
194 }
195
196 first_time = 0;
197
198 //Go to next string.
199 if (selector < (NELEM(kickish_words) - 1))
200 selector++;
201 else
202 selector = 0;
203
204 //Print the description.
205 printf("%s!", kickish_words[selector]);
206
207 //Start the thread. This will hopefully unstall things.
208 thread_handle = CreateThread(
209 NULL, // default security attributes
210 0, // use default stack size
211 MyThreadFunction, // thread function name
212 0, // argument to thread function
213 0, // use default creation flags
214 &thread_id); // returns the thread identifier
215
216 //If the create call failed, terminate.
217 if (thread_handle == NULL)
218 {
219 printf("\nOuch!\n");
220 exit(0);
221 }
222
223 //Wait for thread termination. This should be nearly instant. But it
224 //would seem to be the best way to wait so as not to chew up CPU
225 //cycles.
226 WaitForSingleObject(thread_handle, INFINITE);
227
228 //At this point, the thread should have run, and the variable should have been
229 //set. If not, there is a real logical problem.
230 if (!thread_ran)
231 {
232 printf("\nDouble-ouch\n");
233 exit(0);
234 }
235
236 thread_ran = 0;
237
238 //Delay. Sleep() is likely the most effective way to not waste CPU capacity.
239 Sleep(1000);
240 }
241
242 printf("\n");
243 emit_hline_std();
244 printf("Program terminated with CTRL-C or CTRL-BREAK.\n");
245 emit_hline_std();
246
247 return(0);
248 }
249
250 // End of c_main.c.

Properties

Name Value
svn:eol-style native
svn:keywords Header

dashley@gmail.com
ViewVC Help
Powered by ViewVC 1.1.25