/[cvs]/joko/Uni/BSArch/04/bmp_fractal.c
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revision 1.2 by joko, Sat Jul 1 09:40:29 2006 UTC revision 1.16 by joko, Sun Jul 2 12:21:01 2006 UTC
# Line 4  Line 4 
4   *   *
5   * Uebung 4.4   * Uebung 4.4
6   */   */
7    
8    // $Id$
9    
10    #include <windows.h>
11  #include <stdio.h>  #include <stdio.h>
12  #include <errno.h>  #include <errno.h>
13    
# Line 11  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
23                              0xe6,0x71,0x0b,0x0,   // filesize 750054                              0xe6,0x71,0x0b,0x0,   // filesize 750054
# Line 29  unsigned char header[54]={0x42,0x4d, Line 36  unsigned char header[54]={0x42,0x4d,
36                              0x0,0x0,0x0,0x0       // number of important colors                              0x0,0x0,0x0,0x0       // number of important colors
37                          };                          };
38    
39  int main(int argc, char *argv[])  
40  {  void printErrorAndExit(const char *msg, DWORD err) {
41      FILE *fd;          LPSTR lpMsgBuf;
42      int len,x,y;          if(FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER|
43      char bgr[3];                                    FORMAT_MESSAGE_FROM_SYSTEM |
44      short svalue;                                            FORMAT_MESSAGE_IGNORE_INSERTS,
45      int   lvalue;                                                  NULL,
46      //unsigned char header[54],*ptr=&header[0];                                                  err,
47                                                    MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), // Default language
48      fd=fopen("test.bmp","wb+");                                            (LPTSTR) &lpMsgBuf,
49      if(NULL==fd)                                            0,
50      {                                            NULL ))
51          perror("open"); exit(1);          {
52      }                  fprintf(stderr, "%s: %s\n", msg, lpMsgBuf);
53                    LocalFree(lpMsgBuf);
54      len=fwrite(header,1,sizeof(header),fd); //write header          }
55                else
56      if(-1==len || len!=sizeof(header))          {
57      {                  fprintf(stderr, "Error at FormatMesage: %d\n",err=GetLastError());
58          perror("write");          }
59          exit(2);          exit(err);
60      }  }
61        
62      for(y=YSIZE-1;y>=0;y--)  
63      {  void write_blank_file(char *filename) {
64              for(x=0;x<XSIZE;x++)  
65              {    FILE *fd;
66                  getColorValuesAt(x * (2.0 / XSIZE) - 1.5, y * (2.0 / YSIZE) - 1.0,&bgr[2],&bgr[1],&bgr[0]);    int len, i, img_size;
67                    
68                  len=fwrite(bgr,1,3,fd);    // open file handle
69                  if(-1==len || len!=3)    fd = fopen(filename, "wb+");
70                  {    if (NULL == fd) {
71                      perror("write");      perror("Error while opening file for writing");
72                      exit(4);      exit(1);
73                  }    }
74              }  
75              /*no padding required because 1500%4 =0*/    // write bmp header to file
76      }            len = fwrite(header, 1, sizeof(header), fd);
77      fclose(fd);    
78      // error checking
79      if (-1 == len || len != sizeof(header)) {
80        perror("Error while writing header to file");
81        exit(2);
82      }
83      
84      // write three null-bytes for each pixel to file to create a black picture
85      img_size = XSIZE * YSIZE;
86      for (i = 0; i < img_size; i++) {
87        len = fwrite("\0\0\0", 1, 3, fd);
88        if (-1 == len || len != 3) {
89          perror("Error while writing data to file");
90          exit(4);
91        }
92      }
93      
94      // close file handle
95      fclose(fd);
96    }
97    
98    
99    // arguments for each thread
100    typedef struct _WorkerArguments {
101      int start_row;
102      int number_of_rows;
103      unsigned char * pBitmap;
104    } WORKERARGS, *PWORKERARGS;
105    
106    // worker thread - main entry function
107    DWORD WINAPI fractal_create_segment (LPVOID lpParam) {
108      
109      // thread stuff
110      int thread_id;
111      PWORKERARGS args;
112      unsigned char *pDataBitmapSegment;
113    
114      // fractal calculation
115      int x, y;
116      char bgr[3];
117    
118      thread_id = GetCurrentThreadId();
119      
120      // get worker arguments
121      args = (PWORKERARGS)lpParam;
122    
123      // calculate pointer to beginning of segment
124      pDataBitmapSegment = (unsigned char *)((INT_PTR)args->pBitmap + (YSIZE - (args->start_row + args->number_of_rows)) * 3 * XSIZE);
125    
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
136      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++) {
139          getColorValuesAt(x * (2.0 / XSIZE) - 1.5, y * (2.0 / YSIZE) - 1.0, &bgr[2], &bgr[1], &bgr[0]);
140          
141          // transfer color values to current pixel
142          pDataBitmapSegment[0] = bgr[0];
143          pDataBitmapSegment[1] = bgr[1];
144          pDataBitmapSegment[2] = bgr[2];
145          
146          // move pointer to next pixel
147          pDataBitmapSegment += 3;
148          
149        }
150        //no padding required because 1500%4 =0 ???
151      }
152    
153      if (VERBOSE)
154        fprintf(stdout, "thread finished: %i\n", thread_id);
155      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          opt_current_value = argv[i+1];
170          if (opt_current_value != NULL) {
171            strcpy(opt_value, opt_current_value);
172          }
173          return TRUE;
174        }
175      }
176      return FALSE;
177    }
178    
179    
180    int main(int argc, char *argv[]) {
181    
182      // MMF support
183      DWORD err;
184      HANDLE hMap, hFile;
185      LPVOID pData;
186      unsigned char *pDataBitmap;
187    
188      // workers
189      int workers;
190      int worker_index, worker_rows, worker_startrow;
191      HANDLE *worker_handles;
192      PWORKERARGS worker_args;
193      int worker_count;
194    
195      // threads or processes?
196      BOOL use_processes = FALSE;
197      BOOL is_worker_process = FALSE;
198      
199      // information for creating processes
200      STARTUPINFO si;
201      PROCESS_INFORMATION pi;
202      char szCmdline[65536];
203      
204      // command line stuff
205      char arg_option[1024];
206      char arg_value[1024];
207      char *bmp_filename;
208      char *verbose_option = "";
209      
210    
211      // parse command line arguments
212      if (argc < 2) {
213        fprintf(stderr, "Can not run without arguments!\nPlease specify '-t {number of threads}' or '-p {number of processes}' and an image filename.\n");
214        exit(EXIT_FAILURE);
215      }
216      
217      if (scan_argv(argc, argv, "--verbose", arg_value)) {
218        VERBOSE = TRUE;
219      }
220      
221      if (scan_argv(argc, argv, "--worker", arg_value)) {
222        use_processes = TRUE;
223        is_worker_process = TRUE;
224      
225      } else if (scan_argv(argc, argv, "-p", arg_value)) {
226        if (strlen(arg_value) == 0) {
227          fprintf(stderr, "Please specify number of processes!\n");
228          exit(EXIT_FAILURE);
229        }
230        use_processes = TRUE;
231        is_worker_process = FALSE;
232        workers = atoi(arg_value);
233      
234      } else if (scan_argv(argc, argv, "-t", arg_value)) {
235        if (strlen(arg_value) == 0) {
236          fprintf(stderr, "Please specify number of threads!\n");
237          exit(EXIT_FAILURE);
238        }
239        use_processes = FALSE;
240        is_worker_process = FALSE;
241        workers = atoi(arg_value);
242        
243      }
244      
245      
246      if (VERBOSE && use_processes) {
247        fprintf(stdout, "===================================================== ");
248        if (is_worker_process)
249          fprintf(stdout, "WORKER-PROCESS\n");
250        else
251          fprintf(stdout, "MASTER-PROCESS\n");
252      }
253    
254      
255      // master creates memory mapped file ("empty" image)
256      if (!is_worker_process) {
257        
258        if (argc < 4) {
259          fprintf(stderr, "Must give filename of image as third argument!\n");
260          exit(EXIT_FAILURE);
261        }
262        
263        bmp_filename = argv[3];
264        
265        // create empty bmp-file (black background)
266        write_blank_file(bmp_filename);
267    
268        // open file for reading and writing
269        hFile = CreateFile(bmp_filename, GENERIC_WRITE|GENERIC_READ, 0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
270        if (INVALID_HANDLE_VALUE == hFile) {
271          err = GetLastError();
272          printErrorAndExit("Error at CreateFile",err);
273        }
274    
275        // create the file mapping object
276        hMap = CreateFileMapping(hFile, NULL, PAGE_READWRITE, 0, 0, "bmp_fractal");
277        if (NULL == hMap) {
278          printErrorAndExit("Error at CreateFileMapping", GetLastError());
279        }
280      
281      // worker uses existing memory mapped file
282      } else {
283        
284        // open existing mapping object
285        hMap = OpenFileMapping(FILE_MAP_WRITE, FALSE, "bmp_fractal");
286        if (NULL == hMap)
287          printErrorAndExit("Error at OpenFileMapping", GetLastError());
288      }
289      
290      // map the whole file into the process context
291      pData = MapViewOfFile(hMap, FILE_MAP_WRITE, 0, 0, 0);
292      if (NULL == pData) {
293        printErrorAndExit("Error at MapViewOfFile", GetLastError());
294      }
295    
296      
297      // calculate pointer to beginning of bitmap
298      pDataBitmap = (unsigned char *)((INT_PTR)pData + sizeof(header));
299      
300      // debugging
301      if (VERBOSE) {
302        fprintf(stdout, "pos. of file: %p\n", pData);
303        fprintf(stdout, "pos. of bitmap: %p\n", pDataBitmap);
304      }
305    
306      
307      if (use_processes && is_worker_process) {
308      
309        if (VERBOSE)
310          fprintf(stdout, "inside worker-process\n");
311        
312        // get segment information from command line
313        worker_startrow = atoi(argv[2]);
314        worker_rows = atoi(argv[3]);
315        
316        // allocate memory for one worker's arguments
317        if ((worker_args = malloc(sizeof(worker_args[0]))) == NULL)
318          perror("Error while allocating memory for worker arguments via malloc"), exit(1);
319        
320        // assign worker's arguments
321        worker_args[0].start_row = worker_startrow;
322        worker_args[0].number_of_rows = worker_rows;
323        worker_args[0].pBitmap = pDataBitmap;
324    
325        fractal_create_segment(&worker_args[0]);
326    
327        // cleanup mmap-handle
328        if (!CloseHandle(hMap))
329          printErrorAndExit("Error at CloseHandle", GetLastError());
330        
331        return 0;
332      }
333      
334      /*
335      // turn bitmap into white canvas
336      for (offset = 0; offset < 500 * 500 * 3; offset++) {
337        *pDataBitmap = 255;
338        pDataBitmap++;
339      }
340      exit(0);
341      */
342    
343      // allocate memory for bitmap
344      /*
345      if ((pDataBitmap = malloc(XSIZE * YSIZE * 3 * sizeof(pDataBitmap[0]))) == NULL)
346        perror("malloc"), exit(1);
347      */
348      
349      // allocate memory for table of all worker handles
350      if ((worker_handles = malloc(workers * sizeof(worker_handles[0]))) == NULL)
351        perror("Error while allocating memory for worker handles via malloc"), exit(1);
352    
353      // allocate memory for table of all worker arguments
354      if ((worker_args = malloc(workers * sizeof(worker_args[0]))) == NULL)
355        perror("Error while allocating memory for worker arguments via malloc"), exit(1);
356      
357      
358      // calculate bitmap segment length for workers
359      worker_rows = YSIZE / workers;
360      if (VERBOSE)
361        fprintf(stdout, "rows for each worker: %i\n", worker_rows);
362      
363      // start workers
364      for (worker_index = 0; worker_index < workers; worker_index++) {
365            
366        // debugging: just run single thread
367        //if (worker_index == 1)
368        //  continue;
369        
370        // number of row to start for each worker
371        worker_startrow = worker_index * worker_rows;
372        
373        // recalculate number of rows for last worker if (YSIZE mod workers) != 0
374        if (worker_index == workers - 1) {
375          worker_rows = YSIZE - worker_startrow;
376          if (VERBOSE)
377            fprintf(stdout, "rows for last worker: %i\n", worker_rows);
378        }
379        
380        // assign each worker's arguments
381        worker_args[worker_index].start_row = worker_startrow;
382        worker_args[worker_index].number_of_rows = worker_rows;
383        worker_args[worker_index].pBitmap = pDataBitmap;
384        
385        if (!use_processes) {
386        
387          worker_handles[worker_index] = CreateThread(
388            NULL,                          // LPSECURITY_ATTRIBUTES lpThreadAttributes,
389            0,                             // SIZE_T dwStackSize,
390            &fractal_create_segment,                // LPTHREAD_START_ROUTINE lpStartAddress,
391            &worker_args[worker_index],    // LPVOID lpParameter,
392            0,                             // DWORD dwCreationFlags,
393            NULL                           // LPDWORD lpThreadId
394          );
395    
396          if (!worker_handles[worker_index])
397            printErrorAndExit("CreateThread failed", GetLastError());
398          
399        } else {
400    
401          if (VERBOSE)
402            verbose_option = "--verbose";
403          _snprintf(szCmdline, 1023, "%s %s %i %i %s", argv[0], "--worker", worker_startrow, worker_rows, verbose_option);
404          if (VERBOSE)
405            fprintf(stdout, "starting worker process: %s\n", szCmdline);
406          ZeroMemory( &si, sizeof(si) );
407          si.cb = sizeof(si);
408          ZeroMemory( &pi, sizeof(pi) );
409          
410          if (!CreateProcess(
411              NULL,           // No module name (use command line)
412              szCmdline,      // Command line
413              NULL,           // Process handle not inheritable
414              NULL,           // Thread handle not inheritable
415              FALSE,          // Set handle inheritance to FALSE
416              0,              // No creation flags
417              NULL,           // Use parent's environment block
418              NULL,           // Use parent's starting directory
419              &si,            // Pointer to STARTUPINFO structure
420              &pi             // Pointer to PROCESS_INFORMATION structure
421          ))
422            printErrorAndExit("CreateProcess failed", GetLastError());
423        
424          worker_handles[worker_index] = pi.hProcess;
425          
426        }
427    
428      }
429    
430      if (VERBOSE)
431        fprintf(stdout, "waiting for workers to finish...\n");
432      
433      // wait for all workers
434      for (worker_index = 0; worker_index < workers; worker_index += MAXIMUM_WAIT_OBJECTS) {
435        worker_count = ((workers - worker_index) > MAXIMUM_WAIT_OBJECTS) ? MAXIMUM_WAIT_OBJECTS : (workers - worker_index);
436        if (WaitForMultipleObjects(worker_count, &worker_handles[worker_index], TRUE, INFINITE) == WAIT_FAILED)
437          printErrorAndExit("Error at WaitForMultipleObjects", GetLastError());
438      }
439    
440      // debugging: just run single thread
441      //if (WaitForSingleObject(worker_handles[0], INFINITE) == WAIT_FAILED)
442      //  perror("WaitForSingleObject");
443    
444      // close all worker handles
445      for (worker_index = 0; worker_index < workers; worker_index++)
446        CloseHandle(worker_handles[worker_index]);
447        
448      // write the result into the file
449      if (!FlushViewOfFile(pData, 0)) {
450        err = GetLastError();
451        printErrorAndExit("Error at UnmapViewOfFile", err);
452      }
453    
454      // remove the mapped file
455      if (!UnmapViewOfFile(pData)) {
456        err = GetLastError();
457        printErrorAndExit("Error at UnmapViewOfFile", err);
458        exit(err);
459      }
460      
461      // cleanup handles
462      if (!CloseHandle(hMap) || !CloseHandle(hFile) ) {
463        err = GetLastError();
464        printErrorAndExit("Error at CloseHandle", err);
465      }
466    
467      free(worker_args);
468      free(worker_handles);
469      
470      return 0;
471      
472  }  }
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