/[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 1.14 by joko, Sun Jul 2 11:44:57 2006 UTC revision 1.18 by joko, Sun Jul 2 12:41:56 2006 UTC
# Line 15  Line 15 
15  #define YSIZE 500  #define YSIZE 500
16  #include "algorithm.h"  #include "algorithm.h"
17    
18    #define MAX_COMMAND_LINE 65536
19    #define MMAP_NAME "bmp_fractal"
20    
21  BOOL VERBOSE = FALSE;  BOOL VERBOSE = FALSE;
22    
23    
# Line 49  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 68  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 77  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 86  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 115  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 125  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 136  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 156  DWORD WINAPI fractal_create_segment (LPV Line 163  DWORD WINAPI fractal_create_segment (LPV
163    
164  }  }
165    
 //BOOL scan_argv(int argc, char *argv[], char opt_name[], char *opt_value[]) {  
166  BOOL scan_argv(int argc, char *argv[], char opt_name[], char *opt_value) {  BOOL scan_argv(int argc, char *argv[], char opt_name[], char *opt_value) {
167    int i;    int i;
168    char * opt_current_name;    char * opt_current_name;
# Line 187  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 = FALSE;    BOOL use_processes = FALSE;
# Line 199  int main(int argc, char *argv[]) { Line 206  int main(int argc, char *argv[]) {
206    // information for creating processes    // information for creating processes
207    STARTUPINFO si;    STARTUPINFO si;
208    PROCESS_INFORMATION pi;    PROCESS_INFORMATION pi;
209    char szCmdline[65536];    char szCmdline[MAX_COMMAND_LINE];
210        
211    // command line stuff    // command line stuff
212    char arg_option[1024];    char arg_option[1024];
# Line 208  int main(int argc, char *argv[]) { Line 215  int main(int argc, char *argv[]) {
215    char *verbose_option = "";    char *verbose_option = "";
216        
217    
218    // parse command line arguments    // check command line arguments
219    if (argc < 2) {    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");      fprintf(stderr, "Error: 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);      exit(EXIT_FAILURE);
222    }    }
223    
224        
225      // parse command line arguments
226    if (scan_argv(argc, argv, "--verbose", arg_value)) {    if (scan_argv(argc, argv, "--verbose", arg_value)) {
227      VERBOSE = TRUE;      VERBOSE = TRUE;
228    }    }
# Line 224  int main(int argc, char *argv[]) { Line 233  int main(int argc, char *argv[]) {
233        
234    } else if (scan_argv(argc, argv, "-p", arg_value)) {    } else if (scan_argv(argc, argv, "-p", arg_value)) {
235      if (strlen(arg_value) == 0) {      if (strlen(arg_value) == 0) {
236        fprintf(stderr, "Please specify number of processes!\n");        fprintf(stderr, "Error: Please specify number of processes!\n");
237        exit(EXIT_FAILURE);        exit(EXIT_FAILURE);
238      }      }
239      use_processes = TRUE;      use_processes = TRUE;
# Line 232  int main(int argc, char *argv[]) { Line 241  int main(int argc, char *argv[]) {
241      workers = atoi(arg_value);      workers = atoi(arg_value);
242        
243    } else if (scan_argv(argc, argv, "-t", arg_value)) {    } else if (scan_argv(argc, argv, "-t", arg_value)) {
244      if (strlen(arg_value) == 0) {      
245        fprintf(stderr, "Please specify number of threads!\n");      if (strlen(arg_value) == 0)
246          fprintf(stderr, "Error: Please specify number of threads!\n"),
247        exit(EXIT_FAILURE);        exit(EXIT_FAILURE);
248      }      
249      use_processes = FALSE;      use_processes = FALSE;
250      is_worker_process = FALSE;      is_worker_process = FALSE;
251      workers = atoi(arg_value);      workers = atoi(arg_value);
252            
253    }    }
254      
255      if (!is_worker_process && workers < 1)
256        fprintf(stderr, "Error: Number of threads/processes must be >0!\n"),
257        exit(EXIT_FAILURE);
258        
259    if (VERBOSE && use_processes) {    if (VERBOSE && use_processes) {
260      fprintf(stdout, "===================================================== ");      fprintf(stdout, "===================================================== ");
# Line 256  int main(int argc, char *argv[]) { Line 269  int main(int argc, char *argv[]) {
269    if (!is_worker_process) {    if (!is_worker_process) {
270            
271      if (argc < 4) {      if (argc < 4) {
272        fprintf(stderr, "Must give filename of image as third argument!\n");        fprintf(stderr, "Error: Must give filename of image as third argument!\n");
273        exit(EXIT_FAILURE);        exit(EXIT_FAILURE);
274      }      }
275            
# Line 273  int main(int argc, char *argv[]) { Line 286  int main(int argc, char *argv[]) {
286      }      }
287    
288      // create the file mapping object      // create the file mapping object
289      hMap = CreateFileMapping(hFile, NULL, PAGE_READWRITE, 0, 0, "bmp_fractal");      hMap = CreateFileMapping(hFile, NULL, PAGE_READWRITE, 0, 0, MMAP_NAME);
290      if (NULL == hMap) {      if (NULL == hMap) {
291        printErrorAndExit("Error at CreateFileMapping", GetLastError());        printErrorAndExit("Error at CreateFileMapping", GetLastError());
292      }      }
# Line 282  int main(int argc, char *argv[]) { Line 295  int main(int argc, char *argv[]) {
295    } else {    } else {
296            
297      // open existing mapping object      // open existing mapping object
298      hMap = OpenFileMapping(FILE_MAP_WRITE, FALSE, "bmp_fractal");      hMap = OpenFileMapping(FILE_MAP_WRITE, FALSE, MMAP_NAME);
299      if (NULL == hMap)      if (NULL == hMap)
300        printErrorAndExit("Error at OpenFileMapping", GetLastError());        printErrorAndExit("Error at OpenFileMapping", GetLastError());
301    }    }
# Line 315  int main(int argc, char *argv[]) { Line 328  int main(int argc, char *argv[]) {
328            
329      // allocate memory for one worker's arguments      // allocate memory for one worker's arguments
330      if ((worker_args = malloc(sizeof(worker_args[0]))) == NULL)      if ((worker_args = malloc(sizeof(worker_args[0]))) == NULL)
331        perror("malloc"), exit(1);        perror("Error while allocating memory for worker arguments via malloc"), exit(1);
332            
333      // assign worker's arguments      // assign worker's arguments
334      worker_args[0].start_row = worker_startrow;      worker_args[0].start_row = worker_startrow;
# Line 348  int main(int argc, char *argv[]) { Line 361  int main(int argc, char *argv[]) {
361        
362    // allocate memory for table of all worker handles    // allocate memory for table of all worker handles
363    if ((worker_handles = malloc(workers * sizeof(worker_handles[0]))) == NULL)    if ((worker_handles = malloc(workers * sizeof(worker_handles[0]))) == NULL)
364      perror("malloc"), exit(1);      perror("Error while allocating memory for worker handles via malloc"), exit(1);
365    
366    // allocate memory for table of all worker arguments    // allocate memory for table of all worker arguments
367    if ((worker_args = malloc(workers * sizeof(worker_args[0]))) == NULL)    if ((worker_args = malloc(workers * sizeof(worker_args[0]))) == NULL)
368      perror("malloc"), exit(1);      perror("Error while allocating memory for worker arguments via malloc"), exit(1);
369        
370        
371    // calculate bitmap segment length for workers    // calculate bitmap segment length for workers
# Line 400  int main(int argc, char *argv[]) { Line 413  int main(int argc, char *argv[]) {
413    
414        if (VERBOSE)        if (VERBOSE)
415          verbose_option = "--verbose";          verbose_option = "--verbose";
416        _snprintf(szCmdline, 1023, "%s %s %i %i %s", argv[0], "--worker", worker_startrow, worker_rows, verbose_option);        _snprintf(szCmdline, MAX_COMMAND_LINE - 1, "%s %s %i %i %s", argv[0], "--worker", worker_startrow, worker_rows, verbose_option);
417        if (VERBOSE)        if (VERBOSE)
418          fprintf(stdout, "starting worker process: %s\n", szCmdline);          fprintf(stdout, "starting worker process: %s\n", szCmdline);
419          
420          // prepare data structures for CreateProcess
421        ZeroMemory( &si, sizeof(si) );        ZeroMemory( &si, sizeof(si) );
422        si.cb = sizeof(si);        si.cb = sizeof(si);
423        ZeroMemory( &pi, sizeof(pi) );        ZeroMemory( &pi, sizeof(pi) );
# Line 427  int main(int argc, char *argv[]) { Line 442  int main(int argc, char *argv[]) {
442    
443    }    }
444    
   // wait for all threads  
445    if (VERBOSE)    if (VERBOSE)
446      fprintf(stdout, "waiting for workers to finish...\n");      fprintf(stdout, "waiting for workers to finish...\n");
447    if (WaitForMultipleObjects(workers, worker_handles, TRUE, INFINITE) == WAIT_FAILED)    
448      perror("WaitForMultipleObjects");    // wait for all workers
449      for (worker_index = 0; worker_index < workers; worker_index += MAXIMUM_WAIT_OBJECTS) {
450        worker_count = ((workers - worker_index) > MAXIMUM_WAIT_OBJECTS) ? MAXIMUM_WAIT_OBJECTS : (workers - worker_index);
451        if (WaitForMultipleObjects(worker_count, &worker_handles[worker_index], TRUE, INFINITE) == WAIT_FAILED)
452          printErrorAndExit("Error at WaitForMultipleObjects", GetLastError());
453      }
454    
455    // debugging: just run single thread    // debugging: just run single thread
456    //if (WaitForSingleObject(worker_handles[0], INFINITE) == WAIT_FAILED)    //if (WaitForSingleObject(worker_handles[0], INFINITE) == WAIT_FAILED)
457    //  perror("WaitForSingleObject");    //  perror("WaitForSingleObject");
458    
459    // close all worker handles    // close all worker handles
460    for (worker_index = 0; worker_index < workers; worker_index++)    for (worker_index = 0; worker_index < workers; worker_index++) {
461      CloseHandle(worker_handles[worker_index]);      if (!CloseHandle(worker_handles[worker_index]))
462          printErrorAndExit("Error at CloseHandle for worker handles", GetLastError());
463      }
464            
465    // write the result into the file    // write the result into the file
466    if (!FlushViewOfFile(pData, 0)) {    if (!FlushViewOfFile(pData, 0))
467      err = GetLastError();      printErrorAndExit("Error at UnmapViewOfFile", GetLastError());
     printErrorAndExit("Error at UnmapViewOfFile", err);  
   }  
468    
469    // remove the mapped file    // remove the mapped file
470    if (!UnmapViewOfFile(pData)) {    if (!UnmapViewOfFile(pData))
471      err = GetLastError();      printErrorAndExit("Error at UnmapViewOfFile", GetLastError());
     printErrorAndExit("Error at UnmapViewOfFile", err);  
     exit(err);  
   }  
472        
473    // cleanup handles    // cleanup handles
474    if (!CloseHandle(hMap) || !CloseHandle(hFile) ) {    if (!CloseHandle(hMap) || !CloseHandle(hFile) )
475      err = GetLastError();      printErrorAndExit("Error at CloseHandle for memory mapped file", GetLastError());
     printErrorAndExit("Error at CloseHandle", err);  
   }  
476    
477    free(worker_args);    free(worker_args);
478    free(worker_handles);    free(worker_handles);
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