BSArch/04/bmp_fractal.c

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

// $Id: bmp_fractal.c,v 1.12 2006/07/02 09:27:14 joko Exp $

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

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

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(stdout, "%s: %s\n", msg, lpMsgBuf);
                LocalFree(lpMsgBuf);
        }
        else
        {
                fprintf(stdout, "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("open");
    exit(1);
  }

  // write bmp header to file
  len = fwrite(header, 1, sizeof(header), fd);
  
  // error checking
  if (-1 == len || len != sizeof(header)) {
    perror("write");
    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("write");
      exit(4);
    }
  }
  
  // close file handle
  fclose(fd);
}


// 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];

  thread_id = GetCurrentThreadId();
  
  // 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) {
    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++) {
      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) {
      //printf("opt: %s\n", opt_current_name);
      opt_current_value = argv[i+1];
      //printf("opt-current-value: %s\n", opt_current_value);
      if (opt_current_value != NULL) {
        //*opt_value = *argv[i+1];
        *opt_value = *opt_current_value;
        //printf("opt-value: %s\n", opt_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 = 5;
  int worker_index, worker_rows, worker_startrow;
  HANDLE *worker_handles;
  PWORKERARGS worker_args;

  // threads or processes?
  BOOL use_processes = FALSE;
  BOOL is_worker_process = FALSE;
  
  // information for creating processes
  STARTUPINFO si;
  PROCESS_INFORMATION pi;
  char szCmdline[65536];
  
  // command line stuff
  char arg_option[1024];
  char *arg_value[1024];
  //arg_value = malloc(1024);
  
  VERBOSE = FALSE;
  
  // "parse" command line arguments
  /*
  if (argc >= 2) {
    if (strcmp(argv[1], "--worker") == 0) {
      is_worker_process = TRUE;
    }
  }
  */
  
  //scan_argv(argc, argv, "--worker", &arg_value);
  //*arg_value = '\0';
  // parse command line arguments
  if (scan_argv(argc, argv, "--worker", arg_value)) {
    use_processes = TRUE;
    is_worker_process = TRUE;
  
  } else if (scan_argv(argc, argv, "-p", arg_value)) {
    use_processes = TRUE;
    is_worker_process = FALSE;
    workers = atoi(arg_value);
  
  } else if (scan_argv(argc, argv, "-t", arg_value)) {
    use_processes = FALSE;
    is_worker_process = FALSE;
    workers = atoi(arg_value);
    
  }
  //printf("value: %s\n", arg_value);
  //exit(0);
  
  
  if (VERBOSE && use_processes) {
    fprintf(stdout, "===================================================== ");
    if (is_worker_process)
      fprintf(stdout, "WORKER-PROCESS\n");
    else
      fprintf(stdout, "MASTER-PROCESS\n");
  }
  
  // create empty bmp-file (black background)
  if (!is_worker_process)
    write_blank_file("test.bmp");

  // master creates memory mapped file
  if (!is_worker_process) {
    
    // open file for reading and writing
    hFile = CreateFile("test.bmp", 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, "bmp_fractal");
    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, "bmp_fractal");
    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("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("malloc"), exit(1);

  // allocate memory for table of all worker arguments
  if ((worker_args = malloc(workers * sizeof(worker_args[0]))) == NULL)
    perror("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 {

      _snprintf(szCmdline, 1023, "%s %s %i %i", argv[0], "--worker", worker_startrow, worker_rows);
      if (VERBOSE)
        fprintf(stdout, "starting worker process: %s\n", szCmdline);
      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;
      
    }

  }

  // wait for all threads
  if (VERBOSE)
    fprintf(stdout, "waiting for workers to finish...\n");
  if (WaitForMultipleObjects(workers, worker_handles, TRUE, INFINITE) == WAIT_FAILED)
    perror("WaitForMultipleObjects");

  // 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++)
    CloseHandle(worker_handles[worker_index]);
    
  // 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);
  }

  free(worker_args);
  free(worker_handles);
  
  return 0;
  
}
1	/* Betriebssystem & Middleware
2	*
3	* Betriebssystemarchitektur SS 2006
4	*
5	* Uebung 4.4
6	*/
7
8	// $Id: bmp_fractal.c,v 1.12 2006/07/02 09:27:14 joko Exp $
9
10	#include <windows.h>
11	#include <stdio.h>
12	#include <errno.h>
13
14	#define XSIZE 500
15	#define YSIZE 500
16	#include "algorithm.h"
17
18	BOOL VERBOSE = FALSE;
19
20
21	/* BMP Header */
22	unsigned char header[54]={0x42,0x4d, // signature BM
23	0xe6,0x71,0x0b,0x0, // filesize 750054
24	0x0,0x0,0x0,0x0, // reserved
25	0x36,0x0,0x0,0x0, // image offset 54
26	0x28,0x0,0x0,0x0, // size of header follows 40
27	0xf4,0x1,0x0,0x0, // with of image 500
28	0xf4,0x1,0x0,0x0, // height of image 500
29	0x1,0x0, // number of planes 1
30	0x18,0x0, // number of pixel 24
31	0x0,0x0,0x0,0x0, // compression
32	0xb0,0x71,0x0b,0x0, // size of image 750000
33	0x0,0x0,0x0,0x0, // xres
34	0x0,0x0,0x0,0x0, // yres
35	0x0,0x0,0x0,0x0, // number of colortables
36	0x0,0x0,0x0,0x0 // number of important colors
37	};
38
39
40	void printErrorAndExit(const char *msg, DWORD err) {
41	LPSTR lpMsgBuf;
42	if(FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER\|
43	FORMAT_MESSAGE_FROM_SYSTEM \|
44	FORMAT_MESSAGE_IGNORE_INSERTS,
45	NULL,
46	err,
47	MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), // Default language
48	(LPTSTR) &lpMsgBuf,
49	0,
50	NULL ))
51	{
52	fprintf(stdout, "%s: %s\n", msg, lpMsgBuf);
53	LocalFree(lpMsgBuf);
54	}
55	else
56	{
57	fprintf(stdout, "Error at FormatMesage: %d\n",err=GetLastError());
58	}
59	exit(err);
60	}
61
62
63	void write_blank_file(char *filename) {
64
65	FILE *fd;
66	int len, i, img_size;
67
68	// open file handle
69	fd = fopen(filename, "wb+");
70	if (NULL == fd) {
71	perror("open");
72	exit(1);
73	}
74
75	// write bmp header to file
76	len = fwrite(header, 1, sizeof(header), fd);
77
78	// error checking
79	if (-1 == len \|\| len != sizeof(header)) {
80	perror("write");
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("write");
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	//printf("opt: %s\n", opt_current_name);
170	opt_current_value = argv[i+1];
171	//printf("opt-current-value: %s\n", opt_current_value);
172	if (opt_current_value != NULL) {
173	//opt_value = argv[i+1];
174	opt_value = opt_current_value;
175	//printf("opt-value: %s\n", opt_value);
176	}
177	return TRUE;
178	}
179	}
180	return FALSE;
181	}
182
183
184	int main(int argc, char *argv[]) {
185
186	// MMF support
187	DWORD err;
188	HANDLE hMap, hFile;
189	LPVOID pData;
190	unsigned char *pDataBitmap;
191
192	// workers
193	int workers = 5;
194	int worker_index, worker_rows, worker_startrow;
195	HANDLE *worker_handles;
196	PWORKERARGS worker_args;
197
198	// threads or processes?
199	BOOL use_processes = FALSE;
200	BOOL is_worker_process = FALSE;
201
202	// information for creating processes
203	STARTUPINFO si;
204	PROCESS_INFORMATION pi;
205	char szCmdline[65536];
206
207	// command line stuff
208	char arg_option[1024];
209	char *arg_value[1024];
210	//arg_value = malloc(1024);
211
212	VERBOSE = FALSE;
213
214	// "parse" command line arguments
215	/*
216	if (argc >= 2) {
217	if (strcmp(argv[1], "--worker") == 0) {
218	is_worker_process = TRUE;
219	}
220	}
221	*/
222
223	//scan_argv(argc, argv, "--worker", &arg_value);
224	//*arg_value = '\0';
225	// parse command line arguments
226	if (scan_argv(argc, argv, "--worker", arg_value)) {
227	use_processes = TRUE;
228	is_worker_process = TRUE;
229
230	} else if (scan_argv(argc, argv, "-p", arg_value)) {
231	use_processes = TRUE;
232	is_worker_process = FALSE;
233	workers = atoi(arg_value);
234
235	} else if (scan_argv(argc, argv, "-t", arg_value)) {
236	use_processes = FALSE;
237	is_worker_process = FALSE;
238	workers = atoi(arg_value);
239
240	}
241	//printf("value: %s\n", arg_value);
242	//exit(0);
243
244
245	if (VERBOSE && use_processes) {
246	fprintf(stdout, "===================================================== ");
247	if (is_worker_process)
248	fprintf(stdout, "WORKER-PROCESS\n");
249	else
250	fprintf(stdout, "MASTER-PROCESS\n");
251	}
252
253	// create empty bmp-file (black background)
254	if (!is_worker_process)
255	write_blank_file("test.bmp");
256
257	// master creates memory mapped file
258	if (!is_worker_process) {
259
260	// open file for reading and writing
261	hFile = CreateFile("test.bmp", GENERIC_WRITE\|GENERIC_READ, 0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
262	if (INVALID_HANDLE_VALUE == hFile) {
263	err = GetLastError();
264	printErrorAndExit("Error at CreateFile",err);
265	}
266
267	// create the file mapping object
268	hMap = CreateFileMapping(hFile, NULL, PAGE_READWRITE, 0, 0, "bmp_fractal");
269	if (NULL == hMap) {
270	printErrorAndExit("Error at CreateFileMapping", GetLastError());
271	}
272
273	// worker uses existing memory mapped file
274	} else {
275
276	// open existing mapping object
277	hMap = OpenFileMapping(FILE_MAP_WRITE, FALSE, "bmp_fractal");
278	if (NULL == hMap)
279	printErrorAndExit("Error at OpenFileMapping", GetLastError());
280	}
281
282	// map the whole file into the process context
283	pData = MapViewOfFile(hMap, FILE_MAP_WRITE, 0, 0, 0);
284	if (NULL == pData) {
285	printErrorAndExit("Error at MapViewOfFile", GetLastError());
286	}
287
288
289	// calculate pointer to beginning of bitmap
290	pDataBitmap = (unsigned char *)((INT_PTR)pData + sizeof(header));
291
292	// debugging
293	if (VERBOSE) {
294	fprintf(stdout, "pos. of file: %p\n", pData);
295	fprintf(stdout, "pos. of bitmap: %p\n", pDataBitmap);
296	}
297
298
299	if (use_processes && is_worker_process) {
300
301	if (VERBOSE)
302	fprintf(stdout, "inside worker-process\n");
303
304	// get segment information from command line
305	worker_startrow = atoi(argv[2]);
306	worker_rows = atoi(argv[3]);
307
308	// allocate memory for one worker's arguments
309	if ((worker_args = malloc(sizeof(worker_args[0]))) == NULL)
310	perror("malloc"), exit(1);
311
312	// assign worker's arguments
313	worker_args[0].start_row = worker_startrow;
314	worker_args[0].number_of_rows = worker_rows;
315	worker_args[0].pBitmap = pDataBitmap;
316
317	fractal_create_segment(&worker_args[0]);
318
319	// cleanup mmap-handle
320	if (!CloseHandle(hMap))
321	printErrorAndExit("Error at CloseHandle", GetLastError());
322
323	return 0;
324	}
325
326	/*
327	// turn bitmap into white canvas
328	for (offset = 0; offset < 500 * 500 * 3; offset++) {
329	*pDataBitmap = 255;
330	pDataBitmap++;
331	}
332	exit(0);
333	*/
334
335	// allocate memory for bitmap
336	/*
337	if ((pDataBitmap = malloc(XSIZE * YSIZE * 3 * sizeof(pDataBitmap[0]))) == NULL)
338	perror("malloc"), exit(1);
339	*/
340
341	// allocate memory for table of all worker handles
342	if ((worker_handles = malloc(workers * sizeof(worker_handles[0]))) == NULL)
343	perror("malloc"), exit(1);
344
345	// allocate memory for table of all worker arguments
346	if ((worker_args = malloc(workers * sizeof(worker_args[0]))) == NULL)
347	perror("malloc"), exit(1);
348
349
350	// calculate bitmap segment length for workers
351	worker_rows = YSIZE / workers;
352	if (VERBOSE)
353	fprintf(stdout, "rows for each worker: %i\n", worker_rows);
354
355	// start workers
356	for (worker_index = 0; worker_index < workers; worker_index++) {
357
358	// debugging: just run single thread
359	//if (worker_index == 1)
360	// continue;
361
362	// number of row to start for each worker
363	worker_startrow = worker_index * worker_rows;
364
365	// recalculate number of rows for last worker if (YSIZE mod workers) != 0
366	if (worker_index == workers - 1) {
367	worker_rows = YSIZE - worker_startrow;
368	if (VERBOSE)
369	fprintf(stdout, "rows for last worker: %i\n", worker_rows);
370	}
371
372	// assign each worker's arguments
373	worker_args[worker_index].start_row = worker_startrow;
374	worker_args[worker_index].number_of_rows = worker_rows;
375	worker_args[worker_index].pBitmap = pDataBitmap;
376
377	if (!use_processes) {
378
379	worker_handles[worker_index] = CreateThread(
380	NULL, // LPSECURITY_ATTRIBUTES lpThreadAttributes,
381	0, // SIZE_T dwStackSize,
382	&fractal_create_segment, // LPTHREAD_START_ROUTINE lpStartAddress,
383	&worker_args[worker_index], // LPVOID lpParameter,
384	0, // DWORD dwCreationFlags,
385	NULL // LPDWORD lpThreadId
386	);
387
388	if (!worker_handles[worker_index])
389	printErrorAndExit("CreateThread failed", GetLastError());
390
391	} else {
392
393	_snprintf(szCmdline, 1023, "%s %s %i %i", argv[0], "--worker", worker_startrow, worker_rows);
394	if (VERBOSE)
395	fprintf(stdout, "starting worker process: %s\n", szCmdline);
396	ZeroMemory( &si, sizeof(si) );
397	si.cb = sizeof(si);
398	ZeroMemory( &pi, sizeof(pi) );
399
400	if (!CreateProcess(
401	NULL, // No module name (use command line)
402	szCmdline, // Command line
403	NULL, // Process handle not inheritable
404	NULL, // Thread handle not inheritable
405	FALSE, // Set handle inheritance to FALSE
406	0, // No creation flags
407	NULL, // Use parent's environment block
408	NULL, // Use parent's starting directory
409	&si, // Pointer to STARTUPINFO structure
410	&pi // Pointer to PROCESS_INFORMATION structure
411	))
412	printErrorAndExit("CreateProcess failed", GetLastError());
413
414	worker_handles[worker_index] = pi.hProcess;
415
416	}
417
418	}
419
420	// wait for all threads
421	if (VERBOSE)
422	fprintf(stdout, "waiting for workers to finish...\n");
423	if (WaitForMultipleObjects(workers, worker_handles, TRUE, INFINITE) == WAIT_FAILED)
424	perror("WaitForMultipleObjects");
425
426	// debugging: just run single thread
427	//if (WaitForSingleObject(worker_handles[0], INFINITE) == WAIT_FAILED)
428	// perror("WaitForSingleObject");
429
430	// close all worker handles
431	for (worker_index = 0; worker_index < workers; worker_index++)
432	CloseHandle(worker_handles[worker_index]);
433
434	// write the result into the file
435	if (!FlushViewOfFile(pData, 0)) {
436	err = GetLastError();
437	printErrorAndExit("Error at UnmapViewOfFile", err);
438	}
439
440	// remove the mapped file
441	if (!UnmapViewOfFile(pData)) {
442	err = GetLastError();
443	printErrorAndExit("Error at UnmapViewOfFile", err);
444	exit(err);
445	}
446
447	// cleanup handles
448	if (!CloseHandle(hMap) \|\| !CloseHandle(hFile) ) {
449	err = GetLastError();
450	printErrorAndExit("Error at CloseHandle", err);
451	}
452
453	free(worker_args);
454	free(worker_handles);
455
456	return 0;
457
458	}
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