/[dtapublic]/projs/trunk/projs/20161106_kicker/c_main.c
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revision 78 by dashley, Mon Nov 7 03:39:51 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>
 #include <time.h>  
31  #include <windows.h>  #include <windows.h>
32    
33  #define NELEM(A)  (sizeof(A)/sizeof(A[0]))  #define NELEM(A)  (sizeof(A)/sizeof(A[0]))
34    
35  void emit_hline_std(void)  void emit_hline_std(void)
36  {  {
37     printf("----------------------------------------------------------------------------------\n");     printf("-------------------------------------------------------------------------------\n");
38  }  }
39    
40  void emit_mit_license(void)  void emit_mit_license(void)
41  {  {
42     const char *ref[] =     const char *ref[] =
43     {     {
44        "Permission is hereby granted, free of charge, to any person obtaining a copy of",        "Permission is hereby granted, free of charge, to any person obtaining a copy",
45        "this software and associated documentation files(the \"Software\"), to deal in the",        "of this software and associated documentation files(the \"Software\"), to",
46        "Software without restriction, including without limitation the rights to use,",        "deal in the Software without restriction, including without limitation the",
47        "copy, modify, merge, publish, distribute, sublicense, and / or sell copies of the",        "rights to use, copy, modify, merge, publish, distribute, sublicense, and / or",
48        "Software, and to permit persons to whom the Software is furnished to do so,",        "sell copies of the Software, and to permit persons to whom the Software is",
49        "subject to the following conditions :",        "furnished to do so, subject to the following conditions :",
50        "",        "",
51        "The above copyright notice and this permission notice shall be included in all",        "The above copyright notice and this permission notice shall be included in",
52        "copies or substantial portions of the Software.",        "all copies or substantial portions of the Software.",
53        "",        "",
54        "THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR",        "THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR",
55        "IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,",        "IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,",
# Line 117  const char *kickish_words[] = Line 114  const char *kickish_words[] =
114    
115  volatile int ctrl_c_or_break_pressed = 0;  //volatile because the Visual C++ environment spawns a thread to handle  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.                                             //CTRL-C or CTRL-BREAK.
117    volatile int thread_ran = 0;               //volatile because shared with thread.
118    
119  BOOL CtrlHandler(DWORD fdwCtrlType)  BOOL CtrlHandler(DWORD fdwCtrlType)
120  {  {
# Line 135  BOOL CtrlHandler(DWORD fdwCtrlType) Line 133  BOOL CtrlHandler(DWORD fdwCtrlType)
133                     //blow up and wipe out several city blocks!                     //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;     size_t selector = NELEM(kickish_words) - 1;
147     size_t ui;     size_t ui;
148     int first_time = 1;     int first_time = 1;
149       HANDLE thread_handle;
150       DWORD  thread_id;
151    
152     emit_hline_std();     emit_hline_std();
153     printf("kicker, Copyright 2016 David T. Ashley (dashley@gmail.com)\n");     printf("kicker, Copyright 2016 David T. Ashley (dashley@gmail.com)\n");
154     emit_hline_std();     emit_hline_std();
155     printf("This program is provided under the MIT License, reproduced below.\n");     printf("This program is made available under the MIT License, reproduced below.\n");
156     emit_hline_std();     emit_hline_std();
157     emit_mit_license();     emit_mit_license();
158     emit_hline_std();     emit_hline_std();
# Line 190  int c_main(int argc, char* argv[]) Line 198  int c_main(int argc, char* argv[])
198         //Print the description.         //Print the description.
199         printf("%s!", kickish_words[selector]);         printf("%s!", kickish_words[selector]);
200    
201         //Delay.  Sleep() is likely the most effective way to not waste CPU capacity.             //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);         Sleep(1000);
234     }     }
235    
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dashley@gmail.com
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