/[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 79 - (hide annotations) (download)
Mon Nov 7 17:06:44 2016 UTC (7 years, 3 months ago) by dashley
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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 dashley 79 //$Header$
2 dashley 77 //-------------------------------------------------------------------------------------------------
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 dashley 78 #include <windows.h>
35 dashley 77
36 dashley 78 #define NELEM(A) (sizeof(A)/sizeof(A[0]))
37 dashley 77
38 dashley 78 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 dashley 79 volatile int thread_ran = 0; //volatile because shared with thread.
121 dashley 78
122 dashley 79
123 dashley 78 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 dashley 79
141     //Thread function. Parameter ignored.
142     DWORD WINAPI MyThreadFunction(LPVOID lpParam)
143     {
144     thread_ran = 1;
145    
146     return (0);
147     }
148    
149    
150 dashley 77 int c_main(int argc, char* argv[])
151 dashley 78 {
152     size_t selector = NELEM(kickish_words) - 1;
153     size_t ui;
154     int first_time = 1;
155 dashley 79 HANDLE thread_handle;
156     DWORD thread_id;
157 dashley 78
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 dashley 77 {
177 dashley 78 //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 dashley 79 //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 dashley 78 Sleep(1000);
240 dashley 77 }
241    
242 dashley 78 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 dashley 77 // End of c_main.c.

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