/[dtapublic]/projs/trunk/projs/20161106_kicker/c_main.c
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revision 77 by dashley, Mon Nov 7 02:24:39 2016 UTC revision 85 by dashley, Wed Nov 9 01:31:13 2016 UTC
# Line 1  Line 1 
1  // $Header$  //$Header$
2  //-------------------------------------------------------------------------------------------------  //-------------------------------------------------------------------------------------------------
3  //This file is part of "kicker", a program for spawning threads and/or processes periodically in  //This file is part of "kicker", a program for spawning threads periodically in order to
4  //order to unstall certain Windows programs and scripts.  The cause of the stall is unknown, but  //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.  //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,  //This source code and any program in which it is compiled/used is provided under the MIT License,
8  //reproduced below.  //reproduced below.
# Line 25  Line 25 
25  //OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE  //OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
26  //SOFTWARE.  //SOFTWARE.
27  //-------------------------------------------------------------------------------------------------  //-------------------------------------------------------------------------------------------------
 #include <assert.h>  
 #include <malloc.h>  
28  #include <process.h>  #include <process.h>
29  #include <stdio.h>  #include <stdio.h>
30  #include <string.h>  #include <string.h>
31  #include <time.h>  #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[])  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     printf("Hello, world!\n");         //Backspace over the previous word.
172     return 0;         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.  // End of c_main.c.
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dashley@gmail.com
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