BSArch/04/bmp_fractal.c

/* Betriebssystem & Middleware
 *
 * Betriebssystemarchitektur SS 2006
 *
 * Uebung 4.4 
 */

// $Id: bmp_fractal.c,v 1.16 2006/07/02 12:21:01 joko Exp $

#include <windows.h>
#include <stdio.h>
#include <errno.h>

#define XSIZE 500
#define YSIZE 500
#include "algorithm.h"

#define MAX_COMMAND_LINE 65536
#define MMAP_NAME "bmp_fractal"

BOOL VERBOSE = FALSE;


/* BMP Header */
unsigned char header[54]={0x42,0x4d,              // signature BM
                            0xe6,0x71,0x0b,0x0,   // filesize 750054
                            0x0,0x0,0x0,0x0,      // reserved 
                            0x36,0x0,0x0,0x0,     // image offset 54
                            0x28,0x0,0x0,0x0,     // size of header follows 40
                            0xf4,0x1,0x0,0x0,     // with of image 500
                            0xf4,0x1,0x0,0x0,     // height of image 500
                            0x1,0x0,              // number of planes  1
                            0x18,0x0,             // number of pixel 24
                            0x0,0x0,0x0,0x0,      // compression  
                            0xb0,0x71,0x0b,0x0,   // size of image 750000
                            0x0,0x0,0x0,0x0,      // xres
                            0x0,0x0,0x0,0x0,      // yres   
                            0x0,0x0,0x0,0x0,      // number of colortables    
                            0x0,0x0,0x0,0x0       // number of important colors
                        };


void printErrorAndExit(const char *msg, DWORD err) {
        LPSTR lpMsgBuf;
        if(FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER|
                                  FORMAT_MESSAGE_FROM_SYSTEM | 
                                          FORMAT_MESSAGE_IGNORE_INSERTS,
                                                NULL,
                                                err,
                                          MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), // Default language
                                          (LPTSTR) &lpMsgBuf,
                                          0,
                                          NULL ))
        {
                fprintf(stderr, "%s: %s\n", msg, lpMsgBuf);
                LocalFree(lpMsgBuf);
        }
        else
        {
                fprintf(stderr, "Error at FormatMesage: %d\n",err=GetLastError());
        }
        exit(err);
}


void write_blank_file(char *filename) {

  FILE *fd;
  int len, i, img_size;

  // open file handle
  fd = fopen(filename, "wb+");
  if (NULL == fd) {
    perror("Error while opening file for writing");
    exit(1);
  }

  // write bmp header to file
  len = fwrite(header, 1, sizeof(header), fd);
  
  // error checking
  if (-1 == len || len != sizeof(header)) {
    perror("Error while writing header to file");
    exit(2);
  }
  
  // write three null-bytes for each pixel to file to create a black picture
  img_size = XSIZE * YSIZE;
  for (i = 0; i < img_size; i++) {
    len = fwrite("\0\0\0", 1, 3, fd);
    if (-1 == len || len != 3) {
      perror("Error while writing data to file");
      exit(4);
    }
  }
  
  // close file handle
  if (fclose(fd) != 0) {
    perror("Error while closing file handle");
    exit(1);
  }
}


// arguments for each thread
typedef struct _WorkerArguments {
  int start_row;
  int number_of_rows;
  unsigned char * pBitmap;
} WORKERARGS, *PWORKERARGS;

// worker thread - main entry function
DWORD WINAPI fractal_create_segment (LPVOID lpParam) {
  
  // thread stuff
  int thread_id;
  PWORKERARGS args;
  unsigned char *pDataBitmapSegment;

  // fractal calculation
  int x, y;
  char bgr[3];

  // get worker arguments
  args = (PWORKERARGS)lpParam;

  // calculate pointer to beginning of segment
  pDataBitmapSegment = (unsigned char *)((INT_PTR)args->pBitmap + (YSIZE - (args->start_row + args->number_of_rows)) * 3 * XSIZE);

  // debugging
  if (VERBOSE) {
    thread_id = GetCurrentThreadId();
    fprintf(stdout, "----------------------------------------------\n");
    fprintf(stdout, "thread_id: %i\n", thread_id);
    fprintf(stdout, "arg.start_row: %i\n", args->start_row);
    fprintf(stdout, "arg.number_of_rows: %i\n", args->number_of_rows);
    fprintf(stdout, "segment_start: %p\n", pDataBitmapSegment);
  }
  
  // calculate fractal
  for (y = (args->start_row + args->number_of_rows) - 1; y >= args->start_row; y--) {
    //fprintf(stdout, "calc: thread=%i; y=%i            limits: %i,%i    p: %p\n", thread_id, y, args->start_row, args->number_of_rows, pDataBitmapSegment);
    for (x = 0; x < XSIZE; x++) {
      
      // call to function in static linked library
      getColorValuesAt(x * (2.0 / XSIZE) - 1.5, y * (2.0 / YSIZE) - 1.0, &bgr[2], &bgr[1], &bgr[0]); 
      
      // transfer color values to current pixel
      pDataBitmapSegment[0] = bgr[0];
      pDataBitmapSegment[1] = bgr[1];
      pDataBitmapSegment[2] = bgr[2];
      
      // move pointer to next pixel
      pDataBitmapSegment += 3;
      
    }
    //no padding required because 1500%4 =0 ???
  }

  if (VERBOSE)
    fprintf(stdout, "thread finished: %i\n", thread_id);
  return 0;

}

BOOL scan_argv(int argc, char *argv[], char opt_name[], char *opt_value) {
  int i;
  char * opt_current_name;
  char * opt_current_value;

  //printf("searching for: '%s'\n", opt_name);
  
  for (i = 1; i < argc; i++) {
    opt_current_name = argv[i];
    if (strcmp(opt_current_name, opt_name) == 0) {
      opt_current_value = argv[i+1];
      if (opt_current_value != NULL) {
        strcpy(opt_value, opt_current_value);
      }
      return TRUE;
    }
  }
  return FALSE;
}


int main(int argc, char *argv[]) {

  // MMF support
  DWORD err;
  HANDLE hMap, hFile;
  LPVOID pData;
  unsigned char *pDataBitmap;

  // workers
  int workers;
  int worker_index, worker_rows, worker_startrow;
  HANDLE *worker_handles;
  PWORKERARGS worker_args;
  int worker_count;

  // threads or processes?
  BOOL use_processes = FALSE;
  BOOL is_worker_process = FALSE;
  
  // information for creating processes
  STARTUPINFO si;
  PROCESS_INFORMATION pi;
  char szCmdline[MAX_COMMAND_LINE];
  
  // command line stuff
  char arg_option[1024];
  char arg_value[1024];
  char *bmp_filename;
  char *verbose_option = "";
  

  // check command line arguments
  if (argc < 2) {
    fprintf(stderr, "Can not run without arguments!\nPlease specify '-t {number of threads}' or '-p {number of processes}' and an image filename.\n");
    exit(EXIT_FAILURE);
  }

  
  // parse command line arguments
  if (scan_argv(argc, argv, "--verbose", arg_value)) {
    VERBOSE = TRUE;
  }
  
  if (scan_argv(argc, argv, "--worker", arg_value)) {
    use_processes = TRUE;
    is_worker_process = TRUE;
  
  } else if (scan_argv(argc, argv, "-p", arg_value)) {
    if (strlen(arg_value) == 0) {
      fprintf(stderr, "Please specify number of processes!\n");
      exit(EXIT_FAILURE);
    }
    use_processes = TRUE;
    is_worker_process = FALSE;
    workers = atoi(arg_value);
  
  } else if (scan_argv(argc, argv, "-t", arg_value)) {
    if (strlen(arg_value) == 0) {
      fprintf(stderr, "Please specify number of threads!\n");
      exit(EXIT_FAILURE);
    }
    use_processes = FALSE;
    is_worker_process = FALSE;
    workers = atoi(arg_value);
    
  }
  
  
  if (VERBOSE && use_processes) {
    fprintf(stdout, "===================================================== ");
    if (is_worker_process)
      fprintf(stdout, "WORKER-PROCESS\n");
    else
      fprintf(stdout, "MASTER-PROCESS\n");
  }

  
  // master creates memory mapped file ("empty" image)
  if (!is_worker_process) {
    
    if (argc < 4) {
      fprintf(stderr, "Must give filename of image as third argument!\n");
      exit(EXIT_FAILURE);
    }
    
    bmp_filename = argv[3];
    
    // create empty bmp-file (black background)
    write_blank_file(bmp_filename);

    // open file for reading and writing
    hFile = CreateFile(bmp_filename, GENERIC_WRITE|GENERIC_READ, 0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
    if (INVALID_HANDLE_VALUE == hFile) {
      err = GetLastError();
      printErrorAndExit("Error at CreateFile",err);
    }

    // create the file mapping object
    hMap = CreateFileMapping(hFile, NULL, PAGE_READWRITE, 0, 0, MMAP_NAME);
    if (NULL == hMap) {
      printErrorAndExit("Error at CreateFileMapping", GetLastError());
    }
  
  // worker uses existing memory mapped file
  } else {
    
    // open existing mapping object
    hMap = OpenFileMapping(FILE_MAP_WRITE, FALSE, MMAP_NAME);
    if (NULL == hMap)
      printErrorAndExit("Error at OpenFileMapping", GetLastError());
  }
  
  // map the whole file into the process context
  pData = MapViewOfFile(hMap, FILE_MAP_WRITE, 0, 0, 0);
  if (NULL == pData) {
    printErrorAndExit("Error at MapViewOfFile", GetLastError());
  }

  
  // calculate pointer to beginning of bitmap
  pDataBitmap = (unsigned char *)((INT_PTR)pData + sizeof(header));
  
  // debugging
  if (VERBOSE) {
    fprintf(stdout, "pos. of file: %p\n", pData);
    fprintf(stdout, "pos. of bitmap: %p\n", pDataBitmap);
  }

  
  if (use_processes && is_worker_process) {
  
    if (VERBOSE)
      fprintf(stdout, "inside worker-process\n");
    
    // get segment information from command line
    worker_startrow = atoi(argv[2]);
    worker_rows = atoi(argv[3]);
    
    // allocate memory for one worker's arguments
    if ((worker_args = malloc(sizeof(worker_args[0]))) == NULL)
      perror("Error while allocating memory for worker arguments via malloc"), exit(1);
    
    // assign worker's arguments
    worker_args[0].start_row = worker_startrow;
    worker_args[0].number_of_rows = worker_rows;
    worker_args[0].pBitmap = pDataBitmap;

    fractal_create_segment(&worker_args[0]);

    // cleanup mmap-handle
    if (!CloseHandle(hMap))
      printErrorAndExit("Error at CloseHandle", GetLastError());
    
    return 0;
  }
  
  /*
  // turn bitmap into white canvas
  for (offset = 0; offset < 500 * 500 * 3; offset++) {
    *pDataBitmap = 255;
    pDataBitmap++;
  }
  exit(0);
  */

  // allocate memory for bitmap
  /*
  if ((pDataBitmap = malloc(XSIZE * YSIZE * 3 * sizeof(pDataBitmap[0]))) == NULL)
    perror("malloc"), exit(1);
  */
  
  // allocate memory for table of all worker handles
  if ((worker_handles = malloc(workers * sizeof(worker_handles[0]))) == NULL)
    perror("Error while allocating memory for worker handles via malloc"), exit(1);

  // allocate memory for table of all worker arguments
  if ((worker_args = malloc(workers * sizeof(worker_args[0]))) == NULL)
    perror("Error while allocating memory for worker arguments via malloc"), exit(1);
  
  
  // calculate bitmap segment length for workers
  worker_rows = YSIZE / workers;
  if (VERBOSE)
    fprintf(stdout, "rows for each worker: %i\n", worker_rows);
  
  // start workers
  for (worker_index = 0; worker_index < workers; worker_index++) {
    
    // debugging: just run single thread
    //if (worker_index == 1)
    //  continue;
    
    // number of row to start for each worker
    worker_startrow = worker_index * worker_rows;
    
    // recalculate number of rows for last worker if (YSIZE mod workers) != 0
    if (worker_index == workers - 1) {
      worker_rows = YSIZE - worker_startrow;
      if (VERBOSE)
        fprintf(stdout, "rows for last worker: %i\n", worker_rows);
    }
    
    // assign each worker's arguments
    worker_args[worker_index].start_row = worker_startrow;
    worker_args[worker_index].number_of_rows = worker_rows;
    worker_args[worker_index].pBitmap = pDataBitmap;
    
    if (!use_processes) {
    
      worker_handles[worker_index] = CreateThread(
        NULL,                          // LPSECURITY_ATTRIBUTES lpThreadAttributes,
        0,                             // SIZE_T dwStackSize,
        &fractal_create_segment,                // LPTHREAD_START_ROUTINE lpStartAddress,
        &worker_args[worker_index],    // LPVOID lpParameter,
        0,                             // DWORD dwCreationFlags,
        NULL                           // LPDWORD lpThreadId
      );

      if (!worker_handles[worker_index]) 
        printErrorAndExit("CreateThread failed", GetLastError());
      
    } else {

      if (VERBOSE)
        verbose_option = "--verbose";
      _snprintf(szCmdline, MAX_COMMAND_LINE - 1, "%s %s %i %i %s", argv[0], "--worker", worker_startrow, worker_rows, verbose_option);
      if (VERBOSE)
        fprintf(stdout, "starting worker process: %s\n", szCmdline);
      
      // prepare data structures for CreateProcess
      ZeroMemory( &si, sizeof(si) );
      si.cb = sizeof(si);
      ZeroMemory( &pi, sizeof(pi) );
      
      if (!CreateProcess(
          NULL,           // No module name (use command line)
          szCmdline,      // Command line
          NULL,           // Process handle not inheritable
          NULL,           // Thread handle not inheritable
          FALSE,          // Set handle inheritance to FALSE
          0,              // No creation flags
          NULL,           // Use parent's environment block
          NULL,           // Use parent's starting directory 
          &si,            // Pointer to STARTUPINFO structure
          &pi             // Pointer to PROCESS_INFORMATION structure
      ))
        printErrorAndExit("CreateProcess failed", GetLastError());
    
      worker_handles[worker_index] = pi.hProcess;
      
    }

  }

  if (VERBOSE)
    fprintf(stdout, "waiting for workers to finish...\n");
  
  // wait for all workers
  for (worker_index = 0; worker_index < workers; worker_index += MAXIMUM_WAIT_OBJECTS) {
    worker_count = ((workers - worker_index) > MAXIMUM_WAIT_OBJECTS) ? MAXIMUM_WAIT_OBJECTS : (workers - worker_index);
    if (WaitForMultipleObjects(worker_count, &worker_handles[worker_index], TRUE, INFINITE) == WAIT_FAILED)
      printErrorAndExit("Error at WaitForMultipleObjects", GetLastError());
  }

  // debugging: just run single thread
  //if (WaitForSingleObject(worker_handles[0], INFINITE) == WAIT_FAILED)
  //  perror("WaitForSingleObject");

  // close all worker handles
  for (worker_index = 0; worker_index < workers; worker_index++) {
    if (!CloseHandle(worker_handles[worker_index]))
      printErrorAndExit("Error at CloseHandle for worker handles", GetLastError());
  }
    
  // write the result into the file
  if (!FlushViewOfFile(pData, 0))
    printErrorAndExit("Error at UnmapViewOfFile", GetLastError());

  // remove the mapped file
  if (!UnmapViewOfFile(pData))
    printErrorAndExit("Error at UnmapViewOfFile", GetLastError());
  
  // cleanup handles
  if (!CloseHandle(hMap) || !CloseHandle(hFile) )
    printErrorAndExit("Error at CloseHandle for memory mapped file", GetLastError());

  free(worker_args);
  free(worker_handles);
  
  return 0;
  
}
1	joko	1.1	/* Betriebssystem & Middleware
2			*
3			* Betriebssystemarchitektur SS 2006
4			*
5			* Uebung 4.4
6			*/
7	joko	1.3
8	joko	1.17	// $Id: bmp_fractal.c,v 1.16 2006/07/02 12:21:01 joko Exp $
9	joko	1.3
10			#include <windows.h>
11	joko	1.1	#include <stdio.h>
12			#include <errno.h>
13
14			#define XSIZE 500
15			#define YSIZE 500
16			#include "algorithm.h"
17
18	joko	1.17	#define MAX_COMMAND_LINE 65536
19			#define MMAP_NAME "bmp_fractal"
20
21	joko	1.11	BOOL VERBOSE = FALSE;
22	joko	1.9
23	joko	1.3
24	joko	1.2	/* BMP Header */
25	joko	1.1	unsigned char header[54]={0x42,0x4d, // signature BM
26			0xe6,0x71,0x0b,0x0, // filesize 750054
27			0x0,0x0,0x0,0x0, // reserved
28			0x36,0x0,0x0,0x0, // image offset 54
29			0x28,0x0,0x0,0x0, // size of header follows 40
30			0xf4,0x1,0x0,0x0, // with of image 500
31			0xf4,0x1,0x0,0x0, // height of image 500
32			0x1,0x0, // number of planes 1
33			0x18,0x0, // number of pixel 24
34			0x0,0x0,0x0,0x0, // compression
35			0xb0,0x71,0x0b,0x0, // size of image 750000
36			0x0,0x0,0x0,0x0, // xres
37			0x0,0x0,0x0,0x0, // yres
38			0x0,0x0,0x0,0x0, // number of colortables
39			0x0,0x0,0x0,0x0 // number of important colors
40			};
41
42	joko	1.3
43			void printErrorAndExit(const char *msg, DWORD err) {
44			LPSTR lpMsgBuf;
45			if(FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER\|
46			FORMAT_MESSAGE_FROM_SYSTEM \|
47			FORMAT_MESSAGE_IGNORE_INSERTS,
48			NULL,
49			err,
50			MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), // Default language
51			(LPTSTR) &lpMsgBuf,
52			0,
53			NULL ))
54			{
55	joko	1.15	fprintf(stderr, "%s: %s\n", msg, lpMsgBuf);
56	joko	1.3	LocalFree(lpMsgBuf);
57			}
58			else
59			{
60	joko	1.15	fprintf(stderr, "Error at FormatMesage: %d\n",err=GetLastError());
61	joko	1.3	}
62			exit(err);
63			}
64
65
66			void write_blank_file(char *filename) {
67
68			FILE *fd;
69			int len, i, img_size;
70
71			// open file handle
72			fd = fopen(filename, "wb+");
73			if (NULL == fd) {
74	joko	1.15	perror("Error while opening file for writing");
75	joko	1.3	exit(1);
76			}
77
78			// write bmp header to file
79			len = fwrite(header, 1, sizeof(header), fd);
80
81			// error checking
82			if (-1 == len \|\| len != sizeof(header)) {
83	joko	1.15	perror("Error while writing header to file");
84	joko	1.3	exit(2);
85			}
86
87			// write three null-bytes for each pixel to file to create a black picture
88			img_size = XSIZE * YSIZE;
89			for (i = 0; i < img_size; i++) {
90			len = fwrite("\0\0\0", 1, 3, fd);
91			if (-1 == len \|\| len != 3) {
92	joko	1.15	perror("Error while writing data to file");
93	joko	1.3	exit(4);
94	joko	1.1	}
95	joko	1.3	}
96
97			// close file handle
98	joko	1.17	if (fclose(fd) != 0) {
99			perror("Error while closing file handle");
100			exit(1);
101			}
102	joko	1.3	}
103
104
105	joko	1.6	// arguments for each thread
106			typedef struct _WorkerArguments {
107	joko	1.7	int start_row;
108			int number_of_rows;
109	joko	1.6	unsigned char * pBitmap;
110			} WORKERARGS, *PWORKERARGS;
111
112			// worker thread - main entry function
113	joko	1.10	DWORD WINAPI fractal_create_segment (LPVOID lpParam) {
114	joko	1.6
115			// thread stuff
116			int thread_id;
117			PWORKERARGS args;
118	joko	1.7	unsigned char *pDataBitmapSegment;
119	joko	1.6
120			// fractal calculation
121			int x, y;
122			char bgr[3];
123
124			// get worker arguments
125			args = (PWORKERARGS)lpParam;
126	joko	1.7
127			// calculate pointer to beginning of segment
128			pDataBitmapSegment = (unsigned char )((INT_PTR)args->pBitmap + (YSIZE - (args->start_row + args->number_of_rows)) 3 * XSIZE);
129	joko	1.9
130			// debugging
131			if (VERBOSE) {
132	joko	1.17	thread_id = GetCurrentThreadId();
133	joko	1.11	fprintf(stdout, "----------------------------------------------\n");
134			fprintf(stdout, "thread_id: %i\n", thread_id);
135			fprintf(stdout, "arg.start_row: %i\n", args->start_row);
136			fprintf(stdout, "arg.number_of_rows: %i\n", args->number_of_rows);
137			fprintf(stdout, "segment_start: %p\n", pDataBitmapSegment);
138	joko	1.9	}
139	joko	1.6
140			// calculate fractal
141			for (y = (args->start_row + args->number_of_rows) - 1; y >= args->start_row; y--) {
142	joko	1.11	//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	joko	1.6	for (x = 0; x < XSIZE; x++) {
144	joko	1.17
145			// call to function in static linked library
146	joko	1.6	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
149	joko	1.7	pDataBitmapSegment[0] = bgr[0];
150			pDataBitmapSegment[1] = bgr[1];
151			pDataBitmapSegment[2] = bgr[2];
152	joko	1.6
153			// move pointer to next pixel
154	joko	1.7	pDataBitmapSegment += 3;
155	joko	1.6
156			}
157	joko	1.9	//no padding required because 1500%4 =0 ???
158	joko	1.6	}
159
160	joko	1.9	if (VERBOSE)
161	joko	1.11	fprintf(stdout, "thread finished: %i\n", thread_id);
162	joko	1.6	return 0;
163
164			}
165
166	joko	1.14	BOOL scan_argv(int argc, char argv[], char opt_name[], char opt_value) {
167	joko	1.13	int i;
168			char * opt_current_name;
169			char * opt_current_value;
170	joko	1.14
171	joko	1.13	//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	joko	1.14	strcpy(opt_value, opt_current_value);
179	joko	1.13	}
180			return TRUE;
181			}
182			}
183			return FALSE;
184			}
185
186	joko	1.6
187	joko	1.3	int main(int argc, char *argv[]) {
188
189	joko	1.4	// MMF support
190			DWORD err;
191	joko	1.3	HANDLE hMap, hFile;
192			LPVOID pData;
193	joko	1.9	unsigned char *pDataBitmap;
194	joko	1.4
195	joko	1.5	// workers
196	joko	1.16	int workers;
197	joko	1.7	int worker_index, worker_rows, worker_startrow;
198	joko	1.6	HANDLE *worker_handles;
199			PWORKERARGS worker_args;
200	joko	1.16	int worker_count;
201	joko	1.6
202	joko	1.10	// threads or processes?
203	joko	1.13	BOOL use_processes = FALSE;
204	joko	1.12	BOOL is_worker_process = FALSE;
205	joko	1.10
206			// information for creating processes
207			STARTUPINFO si;
208			PROCESS_INFORMATION pi;
209	joko	1.17	char szCmdline[MAX_COMMAND_LINE];
210	joko	1.10
211	joko	1.13	// command line stuff
212			char arg_option[1024];
213	joko	1.14	char arg_value[1024];
214			char *bmp_filename;
215			char *verbose_option = "";
216	joko	1.10
217	joko	1.14
218	joko	1.17	// check command line arguments
219	joko	1.14	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	joko	1.17
224	joko	1.11
225	joko	1.17	// parse command line arguments
226	joko	1.14	if (scan_argv(argc, argv, "--verbose", arg_value)) {
227			VERBOSE = TRUE;
228	joko	1.10	}
229	joko	1.13
230			if (scan_argv(argc, argv, "--worker", arg_value)) {
231			use_processes = TRUE;
232			is_worker_process = TRUE;
233
234			} else if (scan_argv(argc, argv, "-p", arg_value)) {
235	joko	1.14	if (strlen(arg_value) == 0) {
236			fprintf(stderr, "Please specify number of processes!\n");
237			exit(EXIT_FAILURE);
238			}
239	joko	1.13	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	joko	1.14	if (strlen(arg_value) == 0) {
245			fprintf(stderr, "Please specify number of threads!\n");
246			exit(EXIT_FAILURE);
247			}
248	joko	1.13	use_processes = FALSE;
249			is_worker_process = FALSE;
250			workers = atoi(arg_value);
251
252			}
253
254	joko	1.10
255	joko	1.11	if (VERBOSE && use_processes) {
256			fprintf(stdout, "===================================================== ");
257	joko	1.12	if (is_worker_process)
258	joko	1.11	fprintf(stdout, "WORKER-PROCESS\n");
259			else
260			fprintf(stdout, "MASTER-PROCESS\n");
261	joko	1.10	}
262	joko	1.14
263	joko	1.3
264	joko	1.14	// master creates memory mapped file ("empty" image)
265	joko	1.12	if (!is_worker_process) {
266	joko	1.10
267	joko	1.14	if (argc < 4) {
268			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	joko	1.12	// open file for reading and writing
278	joko	1.14	hFile = CreateFile(bmp_filename, GENERIC_WRITE\|GENERIC_READ, 0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
279	joko	1.10	if (INVALID_HANDLE_VALUE == hFile) {
280			err = GetLastError();
281			printErrorAndExit("Error at CreateFile",err);
282			}
283	joko	1.3
284	joko	1.12	// create the file mapping object
285	joko	1.17	hMap = CreateFileMapping(hFile, NULL, PAGE_READWRITE, 0, 0, MMAP_NAME);
286	joko	1.10	if (NULL == hMap) {
287			printErrorAndExit("Error at CreateFileMapping", GetLastError());
288			}
289	joko	1.12
290			// worker uses existing memory mapped file
291	joko	1.10	} else {
292
293			// open existing mapping object
294	joko	1.17	hMap = OpenFileMapping(FILE_MAP_WRITE, FALSE, MMAP_NAME);
295	joko	1.10	if (NULL == hMap)
296			printErrorAndExit("Error at OpenFileMapping", GetLastError());
297	joko	1.3	}
298
299	joko	1.12	// map the whole file into the process context
300	joko	1.3	pData = MapViewOfFile(hMap, FILE_MAP_WRITE, 0, 0, 0);
301			if (NULL == pData) {
302			printErrorAndExit("Error at MapViewOfFile", GetLastError());
303			}
304
305
306			// calculate pointer to beginning of bitmap
307			pDataBitmap = (unsigned char *)((INT_PTR)pData + sizeof(header));
308
309			// debugging
310	joko	1.9	if (VERBOSE) {
311	joko	1.11	fprintf(stdout, "pos. of file: %p\n", pData);
312			fprintf(stdout, "pos. of bitmap: %p\n", pDataBitmap);
313	joko	1.9	}
314	joko	1.3
315	joko	1.10
316	joko	1.12	if (use_processes && is_worker_process) {
317	joko	1.10
318			if (VERBOSE)
319	joko	1.11	fprintf(stdout, "inside worker-process\n");
320	joko	1.10
321	joko	1.11	// get segment information from command line
322	joko	1.10	worker_startrow = atoi(argv[2]);
323			worker_rows = atoi(argv[3]);
324
325			// allocate memory for one worker's arguments
326			if ((worker_args = malloc(sizeof(worker_args[0]))) == NULL)
327	joko	1.15	perror("Error while allocating memory for worker arguments via malloc"), exit(1);
328	joko	1.10
329			// assign worker's arguments
330			worker_args[0].start_row = worker_startrow;
331			worker_args[0].number_of_rows = worker_rows;
332			worker_args[0].pBitmap = pDataBitmap;
333
334			fractal_create_segment(&worker_args[0]);
335	joko	1.12
336			// cleanup mmap-handle
337			if (!CloseHandle(hMap))
338			printErrorAndExit("Error at CloseHandle", GetLastError());
339	joko	1.10
340	joko	1.13	return 0;
341	joko	1.10	}
342
343	joko	1.3	/*
344	joko	1.9	// turn bitmap into white canvas
345	joko	1.3	for (offset = 0; offset < 500 * 500 * 3; offset++) {
346	joko	1.9	*pDataBitmap = 255;
347			pDataBitmap++;
348	joko	1.3	}
349	joko	1.9	exit(0);
350	joko	1.3	*/
351
352	joko	1.9	// allocate memory for bitmap
353			/*
354			if ((pDataBitmap = malloc(XSIZE * YSIZE * 3 * sizeof(pDataBitmap[0]))) == NULL)
355			perror("malloc"), exit(1);
356			*/
357
358	joko	1.6	// allocate memory for table of all worker handles
359	joko	1.9	if ((worker_handles = malloc(workers * sizeof(worker_handles[0]))) == NULL)
360	joko	1.15	perror("Error while allocating memory for worker handles via malloc"), exit(1);
361	joko	1.6
362			// allocate memory for table of all worker arguments
363	joko	1.9	if ((worker_args = malloc(workers * sizeof(worker_args[0]))) == NULL)
364	joko	1.15	perror("Error while allocating memory for worker arguments via malloc"), exit(1);
365	joko	1.8
366	joko	1.6
367	joko	1.10	// calculate bitmap segment length for workers
368	joko	1.5	worker_rows = YSIZE / workers;
369	joko	1.9	if (VERBOSE)
370	joko	1.11	fprintf(stdout, "rows for each worker: %i\n", worker_rows);
371	joko	1.10
372			// start workers
373	joko	1.5	for (worker_index = 0; worker_index < workers; worker_index++) {
374
375	joko	1.9	// debugging: just run single thread
376	joko	1.7	//if (worker_index == 1)
377			// continue;
378
379	joko	1.5	// number of row to start for each worker
380			worker_startrow = worker_index * worker_rows;
381
382			// recalculate number of rows for last worker if (YSIZE mod workers) != 0
383			if (worker_index == workers - 1) {
384			worker_rows = YSIZE - worker_startrow;
385	joko	1.9	if (VERBOSE)
386	joko	1.11	fprintf(stdout, "rows for last worker: %i\n", worker_rows);
387	joko	1.5	}
388	joko	1.6
389	joko	1.10	// assign each worker's arguments
390	joko	1.6	worker_args[worker_index].start_row = worker_startrow;
391			worker_args[worker_index].number_of_rows = worker_rows;
392			worker_args[worker_index].pBitmap = pDataBitmap;
393
394	joko	1.10	if (!use_processes) {
395	joko	1.6
396	joko	1.10	worker_handles[worker_index] = CreateThread(
397			NULL, // LPSECURITY_ATTRIBUTES lpThreadAttributes,
398			0, // SIZE_T dwStackSize,
399			&fractal_create_segment, // LPTHREAD_START_ROUTINE lpStartAddress,
400			&worker_args[worker_index], // LPVOID lpParameter,
401			0, // DWORD dwCreationFlags,
402			NULL // LPDWORD lpThreadId
403			);
404
405			if (!worker_handles[worker_index])
406			printErrorAndExit("CreateThread failed", GetLastError());
407
408			} else {
409
410	joko	1.14	if (VERBOSE)
411			verbose_option = "--verbose";
412	joko	1.17	_snprintf(szCmdline, MAX_COMMAND_LINE - 1, "%s %s %i %i %s", argv[0], "--worker", worker_startrow, worker_rows, verbose_option);
413	joko	1.11	if (VERBOSE)
414			fprintf(stdout, "starting worker process: %s\n", szCmdline);
415	joko	1.17
416			// prepare data structures for CreateProcess
417	joko	1.10	ZeroMemory( &si, sizeof(si) );
418			si.cb = sizeof(si);
419			ZeroMemory( &pi, sizeof(pi) );
420
421			if (!CreateProcess(
422			NULL, // No module name (use command line)
423			szCmdline, // Command line
424			NULL, // Process handle not inheritable
425			NULL, // Thread handle not inheritable
426			FALSE, // Set handle inheritance to FALSE
427			0, // No creation flags
428			NULL, // Use parent's environment block
429			NULL, // Use parent's starting directory
430			&si, // Pointer to STARTUPINFO structure
431			&pi // Pointer to PROCESS_INFORMATION structure
432			))
433			printErrorAndExit("CreateProcess failed", GetLastError());
434
435			worker_handles[worker_index] = pi.hProcess;
436
437			}
438
439	joko	1.5	}
440
441	joko	1.9	if (VERBOSE)
442	joko	1.11	fprintf(stdout, "waiting for workers to finish...\n");
443	joko	1.16
444			// 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	joko	1.7
451	joko	1.9	// debugging: just run single thread
452	joko	1.7	//if (WaitForSingleObject(worker_handles[0], INFINITE) == WAIT_FAILED)
453			// perror("WaitForSingleObject");
454
455			// close all worker handles
456	joko	1.17	for (worker_index = 0; worker_index < workers; worker_index++) {
457			if (!CloseHandle(worker_handles[worker_index]))
458			printErrorAndExit("Error at CloseHandle for worker handles", GetLastError());
459			}
460	joko	1.7
461	joko	1.12	// write the result into the file
462	joko	1.17	if (!FlushViewOfFile(pData, 0))
463			printErrorAndExit("Error at UnmapViewOfFile", GetLastError());
464	joko	1.3
465	joko	1.12	// remove the mapped file
466	joko	1.17	if (!UnmapViewOfFile(pData))
467			printErrorAndExit("Error at UnmapViewOfFile", GetLastError());
468	joko	1.3
469	joko	1.12	// cleanup handles
470	joko	1.17	if (!CloseHandle(hMap) \|\| !CloseHandle(hFile) )
471			printErrorAndExit("Error at CloseHandle for memory mapped file", GetLastError());
472	joko	1.1
473	joko	1.9	free(worker_args);
474			free(worker_handles);
475	joko	1.8
476			return 0;
477
478	joko	1.1	}
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