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

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Revision 85 - (hide annotations) (download)
Wed Nov 9 01:31:13 2016 UTC (7 years, 3 months ago) by dashley
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File size: 7947 byte(s)
Output and documentation cleanup.
1 dashley 79 //$Header$
2 dashley 77 //-------------------------------------------------------------------------------------------------
3 dashley 85 //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 dashley 77 //-------------------------------------------------------------------------------------------------
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 dashley 78 #include <windows.h>
32 dashley 77
33 dashley 78 #define NELEM(A) (sizeof(A)/sizeof(A[0]))
34 dashley 77
35 dashley 78 void emit_hline_std(void)
36     {
37 dashley 85 printf("-------------------------------------------------------------------------------\n");
38 dashley 78 }
39    
40     void emit_mit_license(void)
41     {
42     const char *ref[] =
43     {
44 dashley 85 "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 dashley 78 "",
51 dashley 85 "The above copyright notice and this permission notice shall be included in",
52     "all copies or substantial portions of the Software.",
53 dashley 78 "",
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 dashley 79 volatile int thread_ran = 0; //volatile because shared with thread.
118 dashley 78
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 dashley 79 //Thread function. Parameter ignored.
137     DWORD WINAPI MyThreadFunction(LPVOID lpParam)
138     {
139     thread_ran = 1;
140    
141     return (0);
142     }
143    
144 dashley 77 int c_main(int argc, char* argv[])
145 dashley 78 {
146     size_t selector = NELEM(kickish_words) - 1;
147     size_t ui;
148     int first_time = 1;
149 dashley 79 HANDLE thread_handle;
150     DWORD thread_id;
151 dashley 78
152     emit_hline_std();
153     printf("kicker, Copyright 2016 David T. Ashley (dashley@gmail.com)\n");
154     emit_hline_std();
155 dashley 85 printf("This program is made available under the MIT License, reproduced below.\n");
156 dashley 78 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 dashley 77 {
171 dashley 78 //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 dashley 79 //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 dashley 78 Sleep(1000);
234 dashley 77 }
235    
236 dashley 78 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 dashley 77 // End of c_main.c.

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