/[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 1.11 by joko, Sun Jul 2 02:12:27 2006 UTC revision 1.17 by joko, Sun Jul 2 12:33:35 2006 UTC
# Line 15  Line 15 
15  #define YSIZE 500  #define YSIZE 500
16  #include "algorithm.h"  #include "algorithm.h"
17    
18  #define VERBOSE_HANDLE "stderr";  #define MAX_COMMAND_LINE 65536
19    #define MMAP_NAME "bmp_fractal"
20    
21  BOOL VERBOSE = FALSE;  BOOL VERBOSE = FALSE;
22    
# Line 51  void printErrorAndExit(const char *msg, Line 52  void printErrorAndExit(const char *msg,
52                                            0,                                            0,
53                                            NULL ))                                            NULL ))
54          {          {
55                  fprintf(stdout, "%s: %s\n", msg, lpMsgBuf);                  fprintf(stderr, "%s: %s\n", msg, lpMsgBuf);
56                  LocalFree(lpMsgBuf);                  LocalFree(lpMsgBuf);
57          }          }
58          else          else
59          {          {
60                  fprintf(stdout, "Error at FormatMesage: %d\n",err=GetLastError());                  fprintf(stderr, "Error at FormatMesage: %d\n",err=GetLastError());
61          }          }
62          exit(err);          exit(err);
63  }  }
# Line 70  void write_blank_file(char *filename) { Line 71  void write_blank_file(char *filename) {
71    // open file handle    // open file handle
72    fd = fopen(filename, "wb+");    fd = fopen(filename, "wb+");
73    if (NULL == fd) {    if (NULL == fd) {
74      perror("open");      perror("Error while opening file for writing");
75      exit(1);      exit(1);
76    }    }
77    
# Line 79  void write_blank_file(char *filename) { Line 80  void write_blank_file(char *filename) {
80        
81    // error checking    // error checking
82    if (-1 == len || len != sizeof(header)) {    if (-1 == len || len != sizeof(header)) {
83      perror("write");      perror("Error while writing header to file");
84      exit(2);      exit(2);
85    }    }
86        
# Line 88  void write_blank_file(char *filename) { Line 89  void write_blank_file(char *filename) {
89    for (i = 0; i < img_size; i++) {    for (i = 0; i < img_size; i++) {
90      len = fwrite("\0\0\0", 1, 3, fd);      len = fwrite("\0\0\0", 1, 3, fd);
91      if (-1 == len || len != 3) {      if (-1 == len || len != 3) {
92        perror("write");        perror("Error while writing data to file");
93        exit(4);        exit(4);
94      }      }
95    }    }
96        
97    // close file handle    // close file handle
98    fclose(fd);    if (fclose(fd) != 0) {
99        perror("Error while closing file handle");
100        exit(1);
101      }
102  }  }
103    
104    
# Line 117  DWORD WINAPI fractal_create_segment (LPV Line 121  DWORD WINAPI fractal_create_segment (LPV
121    int x, y;    int x, y;
122    char bgr[3];    char bgr[3];
123    
   thread_id = GetCurrentThreadId();  
     
124    // get worker arguments    // get worker arguments
125    args = (PWORKERARGS)lpParam;    args = (PWORKERARGS)lpParam;
126    
# Line 127  DWORD WINAPI fractal_create_segment (LPV Line 129  DWORD WINAPI fractal_create_segment (LPV
129    
130    // debugging    // debugging
131    if (VERBOSE) {    if (VERBOSE) {
132        thread_id = GetCurrentThreadId();
133      fprintf(stdout, "----------------------------------------------\n");      fprintf(stdout, "----------------------------------------------\n");
134      fprintf(stdout, "thread_id: %i\n", thread_id);      fprintf(stdout, "thread_id: %i\n", thread_id);
135      fprintf(stdout, "arg.start_row: %i\n", args->start_row);      fprintf(stdout, "arg.start_row: %i\n", args->start_row);
# Line 138  DWORD WINAPI fractal_create_segment (LPV Line 141  DWORD WINAPI fractal_create_segment (LPV
141    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--) {
142      //fprintf(stdout, "calc: thread=%i; y=%i            limits: %i,%i    p: %p\n", thread_id, y, args->start_row, args->number_of_rows, pDataBitmapSegment);      //fprintf(stdout, "calc: thread=%i; y=%i            limits: %i,%i    p: %p\n", thread_id, y, args->start_row, args->number_of_rows, pDataBitmapSegment);
143      for (x = 0; x < XSIZE; x++) {      for (x = 0; x < XSIZE; x++) {
144          
145          // call to function in static linked library
146        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]);
147                
148        // transfer color values to current pixel        // transfer color values to current pixel
# Line 158  DWORD WINAPI fractal_create_segment (LPV Line 163  DWORD WINAPI fractal_create_segment (LPV
163    
164  }  }
165    
166    BOOL scan_argv(int argc, char *argv[], char opt_name[], char *opt_value) {
167      int i;
168      char * opt_current_name;
169      char * opt_current_value;
170    
171      //printf("searching for: '%s'\n", opt_name);
172      
173      for (i = 1; i < argc; i++) {
174        opt_current_name = argv[i];
175        if (strcmp(opt_current_name, opt_name) == 0) {
176          opt_current_value = argv[i+1];
177          if (opt_current_value != NULL) {
178            strcpy(opt_value, opt_current_value);
179          }
180          return TRUE;
181        }
182      }
183      return FALSE;
184    }
185    
186    
187  int main(int argc, char *argv[]) {  int main(int argc, char *argv[]) {
188    
# Line 168  int main(int argc, char *argv[]) { Line 193  int main(int argc, char *argv[]) {
193    unsigned char *pDataBitmap;    unsigned char *pDataBitmap;
194    
195    // workers    // workers
196    int workers = 5;    int workers;
197    int worker_index, worker_rows, worker_startrow;    int worker_index, worker_rows, worker_startrow;
198    HANDLE *worker_handles;    HANDLE *worker_handles;
199    PWORKERARGS worker_args;    PWORKERARGS worker_args;
200      int worker_count;
201    
202    // threads or processes?    // threads or processes?
203    BOOL use_processes = TRUE;    BOOL use_processes = FALSE;
204    BOOL is_worker = FALSE;    BOOL is_worker_process = FALSE;
205        
206    // information for creating processes    // information for creating processes
207    STARTUPINFO si;    STARTUPINFO si;
208    PROCESS_INFORMATION pi;    PROCESS_INFORMATION pi;
209    char szCmdline[1024];    char szCmdline[MAX_COMMAND_LINE];
210        
211      // command line stuff
212      char arg_option[1024];
213      char arg_value[1024];
214      char *bmp_filename;
215      char *verbose_option = "";
216        
217    VERBOSE = TRUE;  
218      // check command line arguments
219      if (argc < 2) {
220        fprintf(stderr, "Can not run without arguments!\nPlease specify '-t {number of threads}' or '-p {number of processes}' and an image filename.\n");
221        exit(EXIT_FAILURE);
222      }
223    
224      
225      // parse command line arguments
226      if (scan_argv(argc, argv, "--verbose", arg_value)) {
227        VERBOSE = TRUE;
228      }
229        
230    // "parse" command line arguments    if (scan_argv(argc, argv, "--worker", arg_value)) {
231    if (argc >= 2) {      use_processes = TRUE;
232      if (strcmp(argv[1], "--worker") == 0) {      is_worker_process = TRUE;
233        is_worker = TRUE;    
234      } else if (scan_argv(argc, argv, "-p", arg_value)) {
235        if (strlen(arg_value) == 0) {
236          fprintf(stderr, "Please specify number of processes!\n");
237          exit(EXIT_FAILURE);
238        }
239        use_processes = TRUE;
240        is_worker_process = FALSE;
241        workers = atoi(arg_value);
242      
243      } else if (scan_argv(argc, argv, "-t", arg_value)) {
244        if (strlen(arg_value) == 0) {
245          fprintf(stderr, "Please specify number of threads!\n");
246          exit(EXIT_FAILURE);
247      }      }
248        use_processes = FALSE;
249        is_worker_process = FALSE;
250        workers = atoi(arg_value);
251        
252    }    }
253        
254      
255    if (VERBOSE && use_processes) {    if (VERBOSE && use_processes) {
256      fprintf(stdout, "===================================================== ");      fprintf(stdout, "===================================================== ");
257      if (is_worker)      if (is_worker_process)
258        fprintf(stdout, "WORKER-PROCESS\n");        fprintf(stdout, "WORKER-PROCESS\n");
259      else      else
260        fprintf(stdout, "MASTER-PROCESS\n");        fprintf(stdout, "MASTER-PROCESS\n");
261    }    }
     
   // create empty bmp-file (black background)  
   if (!is_worker)  
     write_blank_file("test.bmp");  
262    
263    if (!is_worker) {    
264      // master creates memory mapped file ("empty" image)
265      if (!is_worker_process) {
266            
267      /* open file for reading and writing */      if (argc < 4) {
268      hFile = CreateFile("test.bmp", GENERIC_WRITE|GENERIC_READ, 0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);        fprintf(stderr, "Must give filename of image as third argument!\n");
269          exit(EXIT_FAILURE);
270        }
271        
272        bmp_filename = argv[3];
273        
274        // create empty bmp-file (black background)
275        write_blank_file(bmp_filename);
276    
277        // open file for reading and writing
278        hFile = CreateFile(bmp_filename, GENERIC_WRITE|GENERIC_READ, 0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
279      if (INVALID_HANDLE_VALUE == hFile) {      if (INVALID_HANDLE_VALUE == hFile) {
280        err = GetLastError();        err = GetLastError();
281        printErrorAndExit("Error at CreateFile",err);        printErrorAndExit("Error at CreateFile",err);
282      }      }
283    
284      /* create the file mapping object */      // create the file mapping object
285      hMap = CreateFileMapping(hFile, NULL, PAGE_READWRITE, 0, 0, "bmp_fractal");      hMap = CreateFileMapping(hFile, NULL, PAGE_READWRITE, 0, 0, MMAP_NAME);
286      if (NULL == hMap) {      if (NULL == hMap) {
287        printErrorAndExit("Error at CreateFileMapping", GetLastError());        printErrorAndExit("Error at CreateFileMapping", GetLastError());
288      }      }
289          
290      // worker uses existing memory mapped file
291    } else {    } else {
292            
293      // open existing mapping object      // open existing mapping object
294      hMap = OpenFileMapping(FILE_MAP_WRITE, FALSE, "bmp_fractal");      hMap = OpenFileMapping(FILE_MAP_WRITE, FALSE, MMAP_NAME);
295      if (NULL == hMap)      if (NULL == hMap)
296        printErrorAndExit("Error at OpenFileMapping", GetLastError());        printErrorAndExit("Error at OpenFileMapping", GetLastError());
297    }    }
298        
299    /* map the whole file into the process context */    // map the whole file into the process context
300    pData = MapViewOfFile(hMap, FILE_MAP_WRITE, 0, 0, 0);    pData = MapViewOfFile(hMap, FILE_MAP_WRITE, 0, 0, 0);
301    if (NULL == pData) {    if (NULL == pData) {
302      printErrorAndExit("Error at MapViewOfFile", GetLastError());      printErrorAndExit("Error at MapViewOfFile", GetLastError());
# Line 244  int main(int argc, char *argv[]) { Line 313  int main(int argc, char *argv[]) {
313    }    }
314    
315        
316    if (use_processes && is_worker) {      if (use_processes && is_worker_process) {
317        
318      if (VERBOSE)      if (VERBOSE)
319        fprintf(stdout, "inside worker-process\n");        fprintf(stdout, "inside worker-process\n");
# Line 255  int main(int argc, char *argv[]) { Line 324  int main(int argc, char *argv[]) {
324            
325      // allocate memory for one worker's arguments      // allocate memory for one worker's arguments
326      if ((worker_args = malloc(sizeof(worker_args[0]))) == NULL)      if ((worker_args = malloc(sizeof(worker_args[0]))) == NULL)
327        perror("malloc"), exit(1);        perror("Error while allocating memory for worker arguments via malloc"), exit(1);
328            
329      // assign worker's arguments      // assign worker's arguments
330      worker_args[0].start_row = worker_startrow;      worker_args[0].start_row = worker_startrow;
# Line 263  int main(int argc, char *argv[]) { Line 332  int main(int argc, char *argv[]) {
332      worker_args[0].pBitmap = pDataBitmap;      worker_args[0].pBitmap = pDataBitmap;
333    
334      fractal_create_segment(&worker_args[0]);      fractal_create_segment(&worker_args[0]);
335    
336        // cleanup mmap-handle
337        if (!CloseHandle(hMap))
338          printErrorAndExit("Error at CloseHandle", GetLastError());
339            
340      return 0;      return 0;
341    }    }
342        
343    /*    /*
# Line 284  int main(int argc, char *argv[]) { Line 357  int main(int argc, char *argv[]) {
357        
358    // allocate memory for table of all worker handles    // allocate memory for table of all worker handles
359    if ((worker_handles = malloc(workers * sizeof(worker_handles[0]))) == NULL)    if ((worker_handles = malloc(workers * sizeof(worker_handles[0]))) == NULL)
360      perror("malloc"), exit(1);      perror("Error while allocating memory for worker handles via malloc"), exit(1);
361    
362    // allocate memory for table of all worker arguments    // allocate memory for table of all worker arguments
363    if ((worker_args = malloc(workers * sizeof(worker_args[0]))) == NULL)    if ((worker_args = malloc(workers * sizeof(worker_args[0]))) == NULL)
364      perror("malloc"), exit(1);      perror("Error while allocating memory for worker arguments via malloc"), exit(1);
365        
366        
367    // calculate bitmap segment length for workers    // calculate bitmap segment length for workers
# Line 334  int main(int argc, char *argv[]) { Line 407  int main(int argc, char *argv[]) {
407                
408      } else {      } else {
409    
410        _snprintf(szCmdline, 1023, "%s %s %i %i", argv[0], "--worker", worker_startrow, worker_rows);        if (VERBOSE)
411            verbose_option = "--verbose";
412          _snprintf(szCmdline, MAX_COMMAND_LINE - 1, "%s %s %i %i %s", argv[0], "--worker", worker_startrow, worker_rows, verbose_option);
413        if (VERBOSE)        if (VERBOSE)
414          fprintf(stdout, "starting worker process: %s\n", szCmdline);          fprintf(stdout, "starting worker process: %s\n", szCmdline);
415          
416          // prepare data structures for CreateProcess
417        ZeroMemory( &si, sizeof(si) );        ZeroMemory( &si, sizeof(si) );
418        si.cb = sizeof(si);        si.cb = sizeof(si);
419        ZeroMemory( &pi, sizeof(pi) );        ZeroMemory( &pi, sizeof(pi) );
# Line 361  int main(int argc, char *argv[]) { Line 438  int main(int argc, char *argv[]) {
438    
439    }    }
440    
   // wait for all threads  
441    if (VERBOSE)    if (VERBOSE)
442      fprintf(stdout, "waiting for workers to finish...\n");      fprintf(stdout, "waiting for workers to finish...\n");
443    if (WaitForMultipleObjects(workers, worker_handles, TRUE, INFINITE) == WAIT_FAILED)    
444      perror("WaitForMultipleObjects");    // wait for all workers
445      for (worker_index = 0; worker_index < workers; worker_index += MAXIMUM_WAIT_OBJECTS) {
446        worker_count = ((workers - worker_index) > MAXIMUM_WAIT_OBJECTS) ? MAXIMUM_WAIT_OBJECTS : (workers - worker_index);
447        if (WaitForMultipleObjects(worker_count, &worker_handles[worker_index], TRUE, INFINITE) == WAIT_FAILED)
448          printErrorAndExit("Error at WaitForMultipleObjects", GetLastError());
449      }
450    
451    // debugging: just run single thread    // debugging: just run single thread
452    //if (WaitForSingleObject(worker_handles[0], INFINITE) == WAIT_FAILED)    //if (WaitForSingleObject(worker_handles[0], INFINITE) == WAIT_FAILED)
453    //  perror("WaitForSingleObject");    //  perror("WaitForSingleObject");
454    
455    // close all worker handles    // close all worker handles
456    for (worker_index = 0; worker_index < workers; worker_index++)    for (worker_index = 0; worker_index < workers; worker_index++) {
457      CloseHandle(worker_handles[worker_index]);      if (!CloseHandle(worker_handles[worker_index]))
458              printErrorAndExit("Error at CloseHandle for worker handles", GetLastError());
   /* write the result into the file */  
   if (!FlushViewOfFile(pData, 0)) {  
     err = GetLastError();  
     printErrorAndExit("Error at UnmapViewOfFile", err);  
   }  
   
   /* remove the mapped file */  
   if (!UnmapViewOfFile(pData)) {  
     err = GetLastError();  
     printErrorAndExit("Error at UnmapViewOfFile", err);  
     exit(err);  
   }  
     
   /* cleanup handles */  
   if (!CloseHandle(hMap) || !CloseHandle(hFile) ) {  
     err = GetLastError();  
     printErrorAndExit("Error at CloseHandle", err);  
459    }    }
460        
461      // write the result into the file
462      if (!FlushViewOfFile(pData, 0))
463        printErrorAndExit("Error at UnmapViewOfFile", GetLastError());
464    
465      // remove the mapped file
466      if (!UnmapViewOfFile(pData))
467        printErrorAndExit("Error at UnmapViewOfFile", GetLastError());
468      
469      // cleanup handles
470      if (!CloseHandle(hMap) || !CloseHandle(hFile) )
471        printErrorAndExit("Error at CloseHandle for memory mapped file", GetLastError());
472    
473    free(worker_args);    free(worker_args);
474    free(worker_handles);    free(worker_handles);
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