/[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 1.3 by joko, Sat Jul 1 11:45:35 2006 UTC revision 1.10 by joko, Sun Jul 2 01:51:26 2006 UTC
# Line 15  Line 15 
15  #define YSIZE 500  #define YSIZE 500
16  #include "algorithm.h"  #include "algorithm.h"
17    
18    #define MASTER -1
19    
20    BOOL VERBOSE = TRUE;
21    
22    
23  /* BMP Header */  /* BMP Header */
24  unsigned char header[54]={0x42,0x4d,              // signature BM  unsigned char header[54]={0x42,0x4d,              // signature BM
# Line 94  void write_blank_file(char *filename) { Line 98  void write_blank_file(char *filename) {
98  }  }
99    
100    
101  int main(int argc, char *argv[]) {  // arguments for each thread
102    int len,x,y;  typedef struct _WorkerArguments {
103      int start_row;
104      int number_of_rows;
105      unsigned char * pBitmap;
106    } WORKERARGS, *PWORKERARGS;
107    
108    // worker thread - main entry function
109    DWORD WINAPI fractal_create_segment (LPVOID lpParam) {
110      
111      // thread stuff
112      int thread_id;
113      PWORKERARGS args;
114      unsigned char *pDataBitmapSegment;
115    
116      // fractal calculation
117      int x, y;
118    char bgr[3];    char bgr[3];
   short svalue;  
   int lvalue;  
119    
120    HANDLE hMap, hFile;    thread_id = GetCurrentThreadId();
121    DWORD err, size;    
122    int elems;    // get worker arguments
123      args = (PWORKERARGS)lpParam;
124    
125      // calculate pointer to beginning of segment
126      pDataBitmapSegment = (unsigned char *)((INT_PTR)args->pBitmap + (YSIZE - (args->start_row + args->number_of_rows)) * 3 * XSIZE);
127    
128      // debugging
129      if (VERBOSE) {
130        printf("----------------------------------------------\n");
131        printf("thread_id: %i\n", thread_id);
132        printf("arg.start_row: %i\n", args->start_row);
133        printf("arg.number_of_rows: %i\n", args->number_of_rows);
134        printf("segment_start: %p\n", pDataBitmapSegment);
135      }
136        
137      // calculate fractal
138      for (y = (args->start_row + args->number_of_rows) - 1; y >= args->start_row; y--) {
139        //printf("calc: thread=%i; y=%i            limits: %i,%i    p: %p\n", thread_id, y, args->start_row, args->number_of_rows, pDataBitmapSegment);
140        for (x = 0; x < XSIZE; x++) {
141          getColorValuesAt(x * (2.0 / XSIZE) - 1.5, y * (2.0 / YSIZE) - 1.0, &bgr[2], &bgr[1], &bgr[0]);
142          
143          // transfer color values to current pixel
144          pDataBitmapSegment[0] = bgr[0];
145          pDataBitmapSegment[1] = bgr[1];
146          pDataBitmapSegment[2] = bgr[2];
147          
148          // move pointer to next pixel
149          pDataBitmapSegment += 3;
150          
151        }
152        //no padding required because 1500%4 =0 ???
153      }
154    
155      if (VERBOSE)
156        printf("thread finished: %i\n", thread_id);
157      return 0;
158    
159    }
160    
161    
162    int main(int argc, char *argv[]) {
163    
164      // MMF support
165      DWORD err;
166      HANDLE hMap, hFile;
167    LPVOID pData;    LPVOID pData;
168    unsigned char *pDataBitmap, *pDataBitmapCurrent;    unsigned char *pDataBitmap;
169    
170      // workers
171      int workers = 5;
172      int worker_index, worker_rows, worker_startrow;
173      HANDLE *worker_handles;
174      PWORKERARGS worker_args;
175    
176      // threads or processes?
177      BOOL use_processes = TRUE;
178      int worker_id = MASTER;
179        
180    int offset;    // information for creating processes
181      STARTUPINFO si;
182      PROCESS_INFORMATION pi;
183      char szCmdline[1024];
184        
   // create empty file (black background)  
   write_blank_file("test.bmp");  
185        
186      // "parse" command line arguments
187    /* open file for reading and writing */    if (argc >= 2) {
188    hFile = CreateFile("test.bmp", GENERIC_WRITE|GENERIC_READ, 0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);      worker_id = atoi(argv[1]);
189    if (INVALID_HANDLE_VALUE == hFile) {    }
190      err = GetLastError();    
191      printErrorAndExit("Error at CreateFile",err);    if (VERBOSE) {
192        printf("==============================================================\n");
193        printf("worker-id: %i\n", worker_id);
194    }    }
195      
196      // create empty bmp-file (black background)
197      if (worker_id == MASTER)
198        write_blank_file("test.bmp");
199    
200      if (worker_id == MASTER) {
201        
202        /* open file for reading and writing */
203        hFile = CreateFile("test.bmp", GENERIC_WRITE|GENERIC_READ, 0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
204        if (INVALID_HANDLE_VALUE == hFile) {
205          err = GetLastError();
206          printErrorAndExit("Error at CreateFile",err);
207        }
208    
209    /* create the file mapping object */      /* create the file mapping object */
210    hMap = CreateFileMapping(hFile, NULL, PAGE_READWRITE, 0, 0, NULL);      hMap = CreateFileMapping(hFile, NULL, PAGE_READWRITE, 0, 0, "bmp_fractal");
211    if (NULL == hMap) {      if (NULL == hMap) {
212      printErrorAndExit("Error at CreateFileMapping", GetLastError());        printErrorAndExit("Error at CreateFileMapping", GetLastError());
213        }
214        
215      } else {
216        
217        // open existing mapping object
218        hMap = OpenFileMapping(FILE_MAP_WRITE, FALSE, "bmp_fractal");
219        if (NULL == hMap)
220          printErrorAndExit("Error at OpenFileMapping", GetLastError());
221    }    }
222        
223    /* map the whole file into the process context */    /* map the whole file into the process context */
# Line 137  int main(int argc, char *argv[]) { Line 231  int main(int argc, char *argv[]) {
231    pDataBitmap = (unsigned char *)((INT_PTR)pData + sizeof(header));    pDataBitmap = (unsigned char *)((INT_PTR)pData + sizeof(header));
232        
233    // debugging    // debugging
234    printf("pos. of file: %p\n", pData);    if (VERBOSE) {
235    printf("pos. of bitmap: %p\n", pDataBitmap);      printf("pos. of file: %p\n", pData);
236        printf("pos. of bitmap: %p\n", pDataBitmap);
237    // pointer to current pixel    }
   pDataBitmapCurrent = pDataBitmap;  
238    
239      
240      if (use_processes && worker_id != MASTER) {  
241      
242        if (VERBOSE)
243          printf("inside worker-process\n");
244        
245        worker_index = worker_id;
246        
247        worker_startrow = atoi(argv[2]);
248        worker_rows = atoi(argv[3]);
249        
250        // allocate memory for one worker's arguments
251        if ((worker_args = malloc(sizeof(worker_args[0]))) == NULL)
252          perror("malloc"), exit(1);
253        
254        // assign worker's arguments
255        worker_args[0].start_row = worker_startrow;
256        worker_args[0].number_of_rows = worker_rows;
257        worker_args[0].pBitmap = pDataBitmap;
258    
259        fractal_create_segment(&worker_args[0]);
260        
261        return 0;
262      }
263      
264    /*    /*
265    // turn bitmap into white wand    // turn bitmap into white canvas
266    for (offset = 0; offset < 500 * 500 * 3; offset++) {    for (offset = 0; offset < 500 * 500 * 3; offset++) {
267      //pDataBitmap[offset] = 255;      *pDataBitmap = 255;
268      *pDataBitmapCurrent = 255;      pDataBitmap++;
     pDataBitmapCurrent++;  
269    }    }
270      exit(0);
271    */    */
272    
273    // calculate fractal    // allocate memory for bitmap
274    for (y=YSIZE-1; y>=0; y--) {    /*
275            for (x=0; x<XSIZE; x++) {    if ((pDataBitmap = malloc(XSIZE * YSIZE * 3 * sizeof(pDataBitmap[0]))) == NULL)
276              getColorValuesAt(x * (2.0 / XSIZE) - 1.5, y * (2.0 / YSIZE) - 1.0, &bgr[2], &bgr[1], &bgr[0]);      perror("malloc"), exit(1);
277                  */
278              // debugging    
279              //printf("pointer: %p\n", pDataBitmapCurrent);    // allocate memory for table of all worker handles
280                  if ((worker_handles = malloc(workers * sizeof(worker_handles[0]))) == NULL)
281              // transfer color values to current pixel      perror("malloc"), exit(1);
282              //*pDataBitmapCurrent = (unsigned char *)bgr;  
283              pDataBitmapCurrent[0] = bgr[0];    // allocate memory for table of all worker arguments
284              pDataBitmapCurrent[1] = bgr[1];    if ((worker_args = malloc(workers * sizeof(worker_args[0]))) == NULL)
285              pDataBitmapCurrent[2] = bgr[2];      perror("malloc"), exit(1);
286                  
287              // move pointer to next pixel    
288              pDataBitmapCurrent += 3;    // calculate bitmap segment length for workers
289                  worker_rows = YSIZE / workers;
290            }    if (VERBOSE)
291            //no padding required because 1500%4 =0      printf("rows for each worker: %i\n", worker_rows);
292      
293      // start workers
294      for (worker_index = 0; worker_index < workers; worker_index++) {
295        
296        // debugging: just run single thread
297        //if (worker_index == 1)
298        //  continue;
299        
300        // number of row to start for each worker
301        worker_startrow = worker_index * worker_rows;
302        
303        // recalculate number of rows for last worker if (YSIZE mod workers) != 0
304        if (worker_index == workers - 1) {
305          worker_rows = YSIZE - worker_startrow;
306          if (VERBOSE)
307            printf("rows for last worker: %i\n", worker_rows);
308        }
309        
310        // assign each worker's arguments
311        worker_args[worker_index].start_row = worker_startrow;
312        worker_args[worker_index].number_of_rows = worker_rows;
313        worker_args[worker_index].pBitmap = pDataBitmap;
314        
315        if (!use_processes) {
316        
317          worker_handles[worker_index] = CreateThread(
318            NULL,                          // LPSECURITY_ATTRIBUTES lpThreadAttributes,
319            0,                             // SIZE_T dwStackSize,
320            &fractal_create_segment,                // LPTHREAD_START_ROUTINE lpStartAddress,
321            &worker_args[worker_index],    // LPVOID lpParameter,
322            0,                             // DWORD dwCreationFlags,
323            NULL                           // LPDWORD lpThreadId
324          );
325    
326          if (!worker_handles[worker_index])
327            printErrorAndExit("CreateThread failed", GetLastError());
328          
329        } else {
330    
331          _snprintf(szCmdline, 1023, "%s %i %i %i", argv[0], worker_index + 1, worker_startrow, worker_rows);
332          ZeroMemory( &si, sizeof(si) );
333          si.cb = sizeof(si);
334          ZeroMemory( &pi, sizeof(pi) );
335          
336          if (!CreateProcess(
337              NULL,           // No module name (use command line)
338              szCmdline,      // Command line
339              NULL,           // Process handle not inheritable
340              NULL,           // Thread handle not inheritable
341              FALSE,          // Set handle inheritance to FALSE
342              0,              // No creation flags
343              NULL,           // Use parent's environment block
344              NULL,           // Use parent's starting directory
345              &si,            // Pointer to STARTUPINFO structure
346              &pi             // Pointer to PROCESS_INFORMATION structure
347          ))
348            printErrorAndExit("CreateProcess failed", GetLastError());
349        
350          worker_handles[worker_index] = pi.hProcess;
351          
352        }
353    
354    }    }
355    
356        // wait for all threads
357      if (VERBOSE)
358        printf("waiting for workers to finish...\n");
359      if (WaitForMultipleObjects(workers, worker_handles, TRUE, INFINITE) == WAIT_FAILED)
360        perror("WaitForMultipleObjects");
361    
362      // debugging: just run single thread
363      //if (WaitForSingleObject(worker_handles[0], INFINITE) == WAIT_FAILED)
364      //  perror("WaitForSingleObject");
365    
366      // close all worker handles
367      for (worker_index = 0; worker_index < workers; worker_index++)
368        CloseHandle(worker_handles[worker_index]);
369        
370    /* write the result into the file */    /* write the result into the file */
371    if (!FlushViewOfFile(pData, 0)) {    if (!FlushViewOfFile(pData, 0)) {
372      err = GetLastError();      err = GetLastError();
# Line 193  int main(int argc, char *argv[]) { Line 386  int main(int argc, char *argv[]) {
386      printErrorAndExit("Error at CloseHandle", err);      printErrorAndExit("Error at CloseHandle", err);
387    }    }
388    
389      free(worker_args);
390      free(worker_handles);
391      
392      return 0;
393      
394  }  }
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