/[cvs]/joko/Uni/BSArch/04/bmp_fractal.c
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Diff of /joko/Uni/BSArch/04/bmp_fractal.c

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revision 1.6 by joko, Sat Jul 1 13:56:54 2006 UTC revision 1.13 by joko, Sun Jul 2 10:45:02 2006 UTC
# Line 15  Line 15 
15  #define YSIZE 500  #define YSIZE 500
16  #include "algorithm.h"  #include "algorithm.h"
17    
18    BOOL VERBOSE = FALSE;
19    
20    
21  /* BMP Header */  /* BMP Header */
22  unsigned char header[54]={0x42,0x4d,              // signature BM  unsigned char header[54]={0x42,0x4d,              // signature BM
# Line 47  void printErrorAndExit(const char *msg, Line 49  void printErrorAndExit(const char *msg,
49                                            0,                                            0,
50                                            NULL ))                                            NULL ))
51          {          {
52                  fprintf(stderr,"%s : %s\n",msg,lpMsgBuf);                  fprintf(stdout, "%s: %s\n", msg, lpMsgBuf);
53                  LocalFree(lpMsgBuf);                  LocalFree(lpMsgBuf);
54          }          }
55          else          else
56          {          {
57                  fprintf(stderr,"Error at FormatMesage: %d\n",err=GetLastError());                  fprintf(stdout, "Error at FormatMesage: %d\n",err=GetLastError());
58          }          }
59          exit(err);          exit(err);
60  }  }
# Line 96  void write_blank_file(char *filename) { Line 98  void write_blank_file(char *filename) {
98    
99  // arguments for each thread  // arguments for each thread
100  typedef struct _WorkerArguments {  typedef struct _WorkerArguments {
101    unsigned int start_row;    int start_row;
102    unsigned int number_of_rows;    int number_of_rows;
103    unsigned char * pBitmap;    unsigned char * pBitmap;
104  } WORKERARGS, *PWORKERARGS;  } WORKERARGS, *PWORKERARGS;
105    
106  // worker thread - main entry function  // worker thread - main entry function
107  DWORD WINAPI fractal_thread (LPVOID lpParam) {  DWORD WINAPI fractal_create_segment (LPVOID lpParam) {
108        
109    // thread stuff    // thread stuff
110    int thread_id;    int thread_id;
111    PWORKERARGS args;    PWORKERARGS args;
112      unsigned char *pDataBitmapSegment;
113    
114    // fractal calculation    // fractal calculation
115    int x, y;    int x, y;
# Line 116  DWORD WINAPI fractal_thread (LPVOID lpPa Line 119  DWORD WINAPI fractal_thread (LPVOID lpPa
119        
120    // get worker arguments    // get worker arguments
121    args = (PWORKERARGS)lpParam;    args = (PWORKERARGS)lpParam;
122      
123    printf("thread_id: %i\n", thread_id);    // calculate pointer to beginning of segment
124    printf("arg.start_row: %i\n", args->start_row);    pDataBitmapSegment = (unsigned char *)((INT_PTR)args->pBitmap + (YSIZE - (args->start_row + args->number_of_rows)) * 3 * XSIZE);
125    printf("arg.number_of_rows: %i\n", args->number_of_rows);  
126      // debugging
127      if (VERBOSE) {
128        fprintf(stdout, "----------------------------------------------\n");
129        fprintf(stdout, "thread_id: %i\n", thread_id);
130        fprintf(stdout, "arg.start_row: %i\n", args->start_row);
131        fprintf(stdout, "arg.number_of_rows: %i\n", args->number_of_rows);
132        fprintf(stdout, "segment_start: %p\n", pDataBitmapSegment);
133      }
134        
135    // calculate fractal    // calculate fractal
136    for (y = (args->start_row + args->number_of_rows) - 1; y >= args->start_row; y--) {    for (y = (args->start_row + args->number_of_rows) - 1; y >= args->start_row; y--) {
137        //fprintf(stdout, "calc: thread=%i; y=%i            limits: %i,%i    p: %p\n", thread_id, y, args->start_row, args->number_of_rows, pDataBitmapSegment);
138      for (x = 0; x < XSIZE; x++) {      for (x = 0; x < XSIZE; x++) {
139        getColorValuesAt(x * (2.0 / XSIZE) - 1.5, y * (2.0 / YSIZE) - 1.0, &bgr[2], &bgr[1], &bgr[0]);        getColorValuesAt(x * (2.0 / XSIZE) - 1.5, y * (2.0 / YSIZE) - 1.0, &bgr[2], &bgr[1], &bgr[0]);
140                
       // debugging  
       //printf("pointer: %p\n", pDataBitmapCurrent);  
         
141        // transfer color values to current pixel        // transfer color values to current pixel
142        args->pBitmap[0] = bgr[0];        pDataBitmapSegment[0] = bgr[0];
143        args->pBitmap[1] = bgr[1];        pDataBitmapSegment[1] = bgr[1];
144        args->pBitmap[2] = bgr[2];        pDataBitmapSegment[2] = bgr[2];
145                
146        // move pointer to next pixel        // move pointer to next pixel
147        args->pBitmap += 3;        pDataBitmapSegment += 3;
148                
149      }      }
150      //no padding required because 1500%4 =0      //no padding required because 1500%4 =0 ???
151    }    }
152    
153      if (VERBOSE)
154        fprintf(stdout, "thread finished: %i\n", thread_id);
155    return 0;    return 0;
156    
157  }  }
158    
159    BOOL scan_argv(int argc, char *argv[], char opt_name[], char *opt_value[]) {
160      int i;
161      char * opt_current_name;
162      char * opt_current_value;
163      
164      //printf("searching for: '%s'\n", opt_name);
165      
166      for (i = 1; i < argc; i++) {
167        opt_current_name = argv[i];
168        if (strcmp(opt_current_name, opt_name) == 0) {
169          //printf("opt: %s\n", opt_current_name);
170          opt_current_value = argv[i+1];
171          //printf("opt-current-value: %s\n", opt_current_value);
172          if (opt_current_value != NULL) {
173            //*opt_value = *argv[i+1];
174            *opt_value = *opt_current_value;
175            //printf("opt-value: %s\n", opt_value);
176          }
177          return TRUE;
178        }
179      }
180      return FALSE;
181    }
182    
183    
184  int main(int argc, char *argv[]) {  int main(int argc, char *argv[]) {
185    
# Line 152  int main(int argc, char *argv[]) { Line 187  int main(int argc, char *argv[]) {
187    DWORD err;    DWORD err;
188    HANDLE hMap, hFile;    HANDLE hMap, hFile;
189    LPVOID pData;    LPVOID pData;
190    unsigned char *pDataBitmap, *pDataBitmapCurrent;    unsigned char *pDataBitmap;
191    
192    // workers    // workers
193    unsigned int workers = 3;    int workers = 5;
194    unsigned int worker_index, worker_rows, worker_startrow;    int worker_index, worker_rows, worker_startrow;
195    HANDLE *worker_handles;    HANDLE *worker_handles;
   //struct WorkerArguments *worker_args;  
196    PWORKERARGS worker_args;    PWORKERARGS worker_args;
197    
198      // threads or processes?
199      BOOL use_processes = FALSE;
200      BOOL is_worker_process = FALSE;
201      
202      // information for creating processes
203      STARTUPINFO si;
204      PROCESS_INFORMATION pi;
205      char szCmdline[65536];
206      
207      // command line stuff
208      char arg_option[1024];
209      char *arg_value[1024];
210      //arg_value = malloc(1024);
211      
212      VERBOSE = FALSE;
213      
214      // "parse" command line arguments
215      /*
216      if (argc >= 2) {
217        if (strcmp(argv[1], "--worker") == 0) {
218          is_worker_process = TRUE;
219        }
220      }
221      */
222      
223      //scan_argv(argc, argv, "--worker", &arg_value);
224      //*arg_value = '\0';
225      // parse command line arguments
226      if (scan_argv(argc, argv, "--worker", arg_value)) {
227        use_processes = TRUE;
228        is_worker_process = TRUE;
229      
230      } else if (scan_argv(argc, argv, "-p", arg_value)) {
231        use_processes = TRUE;
232        is_worker_process = FALSE;
233        workers = atoi(arg_value);
234      
235      } else if (scan_argv(argc, argv, "-t", arg_value)) {
236        use_processes = FALSE;
237        is_worker_process = FALSE;
238        workers = atoi(arg_value);
239        
240      }
241      //printf("value: %s\n", arg_value);
242      //exit(0);
243      
244      
245      if (VERBOSE && use_processes) {
246        fprintf(stdout, "===================================================== ");
247        if (is_worker_process)
248          fprintf(stdout, "WORKER-PROCESS\n");
249        else
250          fprintf(stdout, "MASTER-PROCESS\n");
251      }
252        
253    // create empty bmp-file (black background)    // create empty bmp-file (black background)
254    write_blank_file("test.bmp");    if (!is_worker_process)
255        write_blank_file("test.bmp");
256    
257    /* open file for reading and writing */    // master creates memory mapped file
258    hFile = CreateFile("test.bmp", GENERIC_WRITE|GENERIC_READ, 0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);    if (!is_worker_process) {
259    if (INVALID_HANDLE_VALUE == hFile) {      
260      err = GetLastError();      // open file for reading and writing
261      printErrorAndExit("Error at CreateFile",err);      hFile = CreateFile("test.bmp", GENERIC_WRITE|GENERIC_READ, 0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
262    }      if (INVALID_HANDLE_VALUE == hFile) {
263          err = GetLastError();
264          printErrorAndExit("Error at CreateFile",err);
265        }
266    
267    /* create the file mapping object */      // create the file mapping object
268    hMap = CreateFileMapping(hFile, NULL, PAGE_READWRITE, 0, 0, NULL);      hMap = CreateFileMapping(hFile, NULL, PAGE_READWRITE, 0, 0, "bmp_fractal");
269    if (NULL == hMap) {      if (NULL == hMap) {
270      printErrorAndExit("Error at CreateFileMapping", GetLastError());        printErrorAndExit("Error at CreateFileMapping", GetLastError());
271        }
272      
273      // worker uses existing memory mapped file
274      } else {
275        
276        // open existing mapping object
277        hMap = OpenFileMapping(FILE_MAP_WRITE, FALSE, "bmp_fractal");
278        if (NULL == hMap)
279          printErrorAndExit("Error at OpenFileMapping", GetLastError());
280    }    }
281        
282    /* map the whole file into the process context */    // map the whole file into the process context
283    pData = MapViewOfFile(hMap, FILE_MAP_WRITE, 0, 0, 0);    pData = MapViewOfFile(hMap, FILE_MAP_WRITE, 0, 0, 0);
284    if (NULL == pData) {    if (NULL == pData) {
285      printErrorAndExit("Error at MapViewOfFile", GetLastError());      printErrorAndExit("Error at MapViewOfFile", GetLastError());
# Line 189  int main(int argc, char *argv[]) { Line 290  int main(int argc, char *argv[]) {
290    pDataBitmap = (unsigned char *)((INT_PTR)pData + sizeof(header));    pDataBitmap = (unsigned char *)((INT_PTR)pData + sizeof(header));
291        
292    // debugging    // debugging
293    printf("pos. of file: %p\n", pData);    if (VERBOSE) {
294    printf("pos. of bitmap: %p\n", pDataBitmap);      fprintf(stdout, "pos. of file: %p\n", pData);
295        fprintf(stdout, "pos. of bitmap: %p\n", pDataBitmap);
296    // pointer to current pixel    }
   pDataBitmapCurrent = pDataBitmap;  
297    
298      
299      if (use_processes && is_worker_process) {
300      
301        if (VERBOSE)
302          fprintf(stdout, "inside worker-process\n");
303        
304        // get segment information from command line
305        worker_startrow = atoi(argv[2]);
306        worker_rows = atoi(argv[3]);
307        
308        // allocate memory for one worker's arguments
309        if ((worker_args = malloc(sizeof(worker_args[0]))) == NULL)
310          perror("malloc"), exit(1);
311        
312        // assign worker's arguments
313        worker_args[0].start_row = worker_startrow;
314        worker_args[0].number_of_rows = worker_rows;
315        worker_args[0].pBitmap = pDataBitmap;
316    
317        fractal_create_segment(&worker_args[0]);
318    
319        // cleanup mmap-handle
320        if (!CloseHandle(hMap))
321          printErrorAndExit("Error at CloseHandle", GetLastError());
322        
323        return 0;
324      }
325      
326    /*    /*
327    // turn bitmap into white wand    // turn bitmap into white canvas
328    for (offset = 0; offset < 500 * 500 * 3; offset++) {    for (offset = 0; offset < 500 * 500 * 3; offset++) {
329      //pDataBitmap[offset] = 255;      *pDataBitmap = 255;
330      *pDataBitmapCurrent = 255;      pDataBitmap++;
     pDataBitmapCurrent++;  
331    }    }
332      exit(0);
333    */    */
334    
335      // allocate memory for bitmap
336      /*
337      if ((pDataBitmap = malloc(XSIZE * YSIZE * 3 * sizeof(pDataBitmap[0]))) == NULL)
338        perror("malloc"), exit(1);
339      */
340      
341    // allocate memory for table of all worker handles    // allocate memory for table of all worker handles
342    if ((worker_handles = malloc(workers * sizeof worker_handles[0])) == NULL)    if ((worker_handles = malloc(workers * sizeof(worker_handles[0]))) == NULL)
343      perror("malloc"), exit(1);      perror("malloc"), exit(1);
344    
   /*  
345    // allocate memory for table of all worker arguments    // allocate memory for table of all worker arguments
346    if ((worker_args = malloc(workers * sizeof worker_args[0])) == NULL)    if ((worker_args = malloc(workers * sizeof(worker_args[0]))) == NULL)
347      perror("malloc"), exit(1);      perror("malloc"), exit(1);
   */  
   // allocate memory for table of all worker arguments  
   worker_args = (PWORKERARGS) HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, workers * sizeof(WORKERARGS));  
348        
349    // calculate segments of bitmap for worker threads/processes and start them    
350      // calculate bitmap segment length for workers
351    worker_rows = YSIZE / workers;    worker_rows = YSIZE / workers;
352    printf("rows for each worker: %i\n", worker_rows);    if (VERBOSE)
353        fprintf(stdout, "rows for each worker: %i\n", worker_rows);
354      
355      // start workers
356    for (worker_index = 0; worker_index < workers; worker_index++) {    for (worker_index = 0; worker_index < workers; worker_index++) {
357            
358        // debugging: just run single thread
359        //if (worker_index == 1)
360        //  continue;
361        
362      // number of row to start for each worker      // number of row to start for each worker
363      worker_startrow = worker_index * worker_rows;      worker_startrow = worker_index * worker_rows;
364            
365      // recalculate number of rows for last worker if (YSIZE mod workers) != 0      // recalculate number of rows for last worker if (YSIZE mod workers) != 0
366      if (worker_index == workers - 1) {      if (worker_index == workers - 1) {
367        worker_rows = YSIZE - worker_startrow;        worker_rows = YSIZE - worker_startrow;
368        printf("rows for last worker: %i\n", worker_rows);        if (VERBOSE)
369            fprintf(stdout, "rows for last worker: %i\n", worker_rows);
370      }      }
371            
372        // assign each worker's arguments
373      worker_args[worker_index].start_row = worker_startrow;      worker_args[worker_index].start_row = worker_startrow;
374      worker_args[worker_index].number_of_rows = worker_rows;      worker_args[worker_index].number_of_rows = worker_rows;
375      worker_args[worker_index].pBitmap = pDataBitmap;      worker_args[worker_index].pBitmap = pDataBitmap;
376            
377      worker_handles[worker_index] = CreateThread(      if (!use_processes) {
378        NULL,                          // LPSECURITY_ATTRIBUTES lpThreadAttributes,      
379        0,                             // SIZE_T dwStackSize,        worker_handles[worker_index] = CreateThread(
380        fractal_thread,                // LPTHREAD_START_ROUTINE lpStartAddress,          NULL,                          // LPSECURITY_ATTRIBUTES lpThreadAttributes,
381        &worker_args[worker_index],    // LPVOID lpParameter,          0,                             // SIZE_T dwStackSize,
382        0,                             // DWORD dwCreationFlags,          &fractal_create_segment,                // LPTHREAD_START_ROUTINE lpStartAddress,
383        NULL                           // LPDWORD lpThreadId          &worker_args[worker_index],    // LPVOID lpParameter,
384      );          0,                             // DWORD dwCreationFlags,
385            NULL                           // LPDWORD lpThreadId
386          );
387    
388          if (!worker_handles[worker_index])
389            printErrorAndExit("CreateThread failed", GetLastError());
390          
391        } else {
392    
393          _snprintf(szCmdline, 1023, "%s %s %i %i", argv[0], "--worker", worker_startrow, worker_rows);
394          if (VERBOSE)
395            fprintf(stdout, "starting worker process: %s\n", szCmdline);
396          ZeroMemory( &si, sizeof(si) );
397          si.cb = sizeof(si);
398          ZeroMemory( &pi, sizeof(pi) );
399          
400          if (!CreateProcess(
401              NULL,           // No module name (use command line)
402              szCmdline,      // Command line
403              NULL,           // Process handle not inheritable
404              NULL,           // Thread handle not inheritable
405              FALSE,          // Set handle inheritance to FALSE
406              0,              // No creation flags
407              NULL,           // Use parent's environment block
408              NULL,           // Use parent's starting directory
409              &si,            // Pointer to STARTUPINFO structure
410              &pi             // Pointer to PROCESS_INFORMATION structure
411          ))
412            printErrorAndExit("CreateProcess failed", GetLastError());
413            
414          worker_handles[worker_index] = pi.hProcess;
415          
416        }
417    
418    }    }
419    
420    // wait for all threads    // wait for all threads
421      if (VERBOSE)
422        fprintf(stdout, "waiting for workers to finish...\n");
423    if (WaitForMultipleObjects(workers, worker_handles, TRUE, INFINITE) == WAIT_FAILED)    if (WaitForMultipleObjects(workers, worker_handles, TRUE, INFINITE) == WAIT_FAILED)
424      perror("WaitForMultipleObjects");      perror("WaitForMultipleObjects");
425      
426    /* write the result into the file */    // debugging: just run single thread
427      //if (WaitForSingleObject(worker_handles[0], INFINITE) == WAIT_FAILED)
428      //  perror("WaitForSingleObject");
429    
430      // close all worker handles
431      for (worker_index = 0; worker_index < workers; worker_index++)
432        CloseHandle(worker_handles[worker_index]);
433        
434      // write the result into the file
435    if (!FlushViewOfFile(pData, 0)) {    if (!FlushViewOfFile(pData, 0)) {
436      err = GetLastError();      err = GetLastError();
437      printErrorAndExit("Error at UnmapViewOfFile", err);      printErrorAndExit("Error at UnmapViewOfFile", err);
438    }    }
439    
440    /* remove the mapped file */    // remove the mapped file
441    if (!UnmapViewOfFile(pData)) {    if (!UnmapViewOfFile(pData)) {
442      err = GetLastError();      err = GetLastError();
443      printErrorAndExit("Error at UnmapViewOfFile", err);      printErrorAndExit("Error at UnmapViewOfFile", err);
444      exit(err);      exit(err);
445    }    }
446        
447    /* cleanup handles */    // cleanup handles
448    if (!CloseHandle(hMap) || !CloseHandle(hFile) ) {    if (!CloseHandle(hMap) || !CloseHandle(hFile) ) {
449      err = GetLastError();      err = GetLastError();
450      printErrorAndExit("Error at CloseHandle", err);      printErrorAndExit("Error at CloseHandle", err);
451    }    }
452    
453      free(worker_args);
454      free(worker_handles);
455      
456      return 0;
457      
458  }  }
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