Google face questions-there are four threads 1, 2, 3, 4. The function of thread 1 is output 1, the function of thread 2 is output 2, etc... There are now four file ABCD

Category: Windows programming C + + 2012-10-27 19:56 3410 people read reviews (1) favorite reports There are four threads of 1, 2, 3, 4. The function of thread 1 is output 1, the function of thread 2 is output 2, etc... There are now four file ABCD. The initial is empty. Now you want four files to appear in the following format: A:1 2 3 4 1 2....b:2 3 4 1 2 3....c:3 4 1 2 3 4....d:4 1 2 3 4 1 .... Please design the program. [CPP]View Plaincopy

2. #include <stdio.h>
4. #include <process.h>
6. #include <windows.h>
8. #include <fstream.h>
10. #include <string.h>
16. unsigned int __stdcall fun (void *ppm);
20. Number of threads
22. const INT thread_num = 4;
24. const INT file_num = 4;
28. Ofstream Ofile[file_num];
32. The next file to be written for a thread
34. int file_thread[file_num]={0,1,2,3};
36. int next_loop[file_num]={0,1,2,3,};
40. Critical_section G_csfile;
44. Number of Cycles
46. const INT LOOP = 6;
50. Mutex events
52. HANDLE G_hthreadevent[thread_num];
58. int main ()
60. {
62. printf ("\ t has four threads of 1, 2, 3, 4.  The function of thread 1 is output 1, the function of thread 2 is output 2\n ");
64. printf ("And so on ...). There are now four file ABCD. The initial is empty.  Four files are to be presented in the following format \ n ");
68. int i = 0, J;
70. HANDLE Hdl[thread_num];
72. InitializeCriticalSection (&g_csfile);
76. //When the event is turned on, there is no trigger.
78. For (i = 0; i < thread_num; i++)
80. G_hthreadevent[i] = CreateEvent (null,false,false,null);
84. //The thread number is passed in as a thread parameter, first converted to a pointer, then converted to shaping,
88. char file_thread[] ="A.txt";
92. For (i = 0; i < file_num; i++)
94. {
98. File_thread[0] = i + ' A ';
100. Ofile[i].open (File_thread,ios::trunc);
104. if (Ofile[i].fail ())
106. {
108. printf ("failed to open file%s", File_thread);
110. continue;
112. }
114. }
118. For (i = 0; i < thread_num; i++)
120. Hdl[i] = (HANDLE) _beginthreadex (Null,0,fun, (void*) i,0,null);
126. //triggers the first thread, and the thread function triggers the next thread to execute on its own
128. SetEvent (G_hthreadevent[0]);
134. WaitForMultipleObjects (Thread_num,hdl,true,infinite);
138. //Cleanup
140. For (i = 0; i < thread_num; i++)
142. {
144. CloseHandle (Hdl[i]);
146. CloseHandle (G_hthreadevent[i]);
148. }
152. For (i = 0; i< file_num;i++)
154. {
156. Ofile[i].close ();
158. }
160. DeleteCriticalSection (&g_csfile);
164. return 0;
166. }
170. unsigned int __stdcall fun (void *ppm)
172. {
176. int num = (int) PPM;
178. int i = 0;
180. For (i = 0; i< loop;i++)
182. {
184. //wait sequence trigger
186. WaitForSingleObject (G_hthreadevent[num],infinite);
190. EnterCriticalSection (&g_csfile);
194. printf ("thread%d is writing to the%c file, and the next time it operates on file%c is thread%d\n",
196. num + 1, File_thread[num] + ' A ', File_thread[num] + ' A ', (num+1)% (thread_num) + 1);
200. ofile[file_thread[num]]<<num+1<<"";
204. Sleep (200);
208. //Record the next round corresponding serial number to manipulate the file, (num+1)% (file_num) event corresponding to the thread, action file File_thread[num]
210. next_loop[(num+1)% (file_num)] = File_thread[num];
214. if (num + 1 = = File_num)
216. {
218. printf ("\ n");
220. //This write end, will calculate the next round of file operation sequence to take over
222. memcpy (&file_thread,&next_loop,file_num *sizeof (int));
224. }
228. LeaveCriticalSection (&g_csfile);
232. //Trigger the next thread, 1 trigger 2, 2 trigger 3,3 trigger 1
234. SetEvent (g_hthreadevent[(num+1)%thread_num]);
236. }
238. return 0;
240. }

Google face questions-there are four threads 1, 2, 3, 4. The function of thread 1 is output 1, the function of thread 2 is output 2, etc... There are now four file ABCD