BSArch/04/bmp_fractal.c

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

// $Id: bmp_fractal.c,v 1.9 2006/07/02 00:24:17 joko Exp $

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

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

#define MASTER -1

BOOL VERBOSE = TRUE;


/* 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("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) {
    printf("----------------------------------------------\n");
    printf("thread_id: %i\n", thread_id);
    printf("arg.start_row: %i\n", args->start_row);
    printf("arg.number_of_rows: %i\n", args->number_of_rows);
    printf("segment_start: %p\n", pDataBitmapSegment);
  }
  
  // calculate fractal
  for (y = (args->start_row + args->number_of_rows) - 1; y >= args->start_row; y--) {
    //printf("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)
    printf("thread finished: %i\n", thread_id);
  return 0;

}


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 = TRUE;
  int worker_id = MASTER;
  
  // information for creating processes
  STARTUPINFO si;
  PROCESS_INFORMATION pi;
  char szCmdline[1024];
  
  
  // "parse" command line arguments
  if (argc >= 2) {
    worker_id = atoi(argv[1]);
  }
  
  if (VERBOSE) {
    printf("==============================================================\n");
    printf("worker-id: %i\n", worker_id);
  }
  
  // create empty bmp-file (black background)
  if (worker_id == MASTER)
    write_blank_file("test.bmp");

  if (worker_id == MASTER) {
    
    /* 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());
    }
    
  } 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) {
    printf("pos. of file: %p\n", pData);
    printf("pos. of bitmap: %p\n", pDataBitmap);
  }

  
  if (use_processes && worker_id != MASTER) {  
  
    if (VERBOSE)
      printf("inside worker-process\n");
    
    worker_index = worker_id;
    
    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]);
    
    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)
    printf("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)
        printf("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 %i %i %i", argv[0], worker_index + 1, worker_startrow, worker_rows);
      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)
    printf("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 1.9 2006/07/02 00:24:17 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	#define MASTER -1
19
20	BOOL VERBOSE = TRUE;
21
22
23	/* BMP Header */
24	unsigned char header[54]={0x42,0x4d, // signature BM
25	0xe6,0x71,0x0b,0x0, // filesize 750054
26	0x0,0x0,0x0,0x0, // reserved
27	0x36,0x0,0x0,0x0, // image offset 54
28	0x28,0x0,0x0,0x0, // size of header follows 40
29	0xf4,0x1,0x0,0x0, // with of image 500
30	0xf4,0x1,0x0,0x0, // height of image 500
31	0x1,0x0, // number of planes 1
32	0x18,0x0, // number of pixel 24
33	0x0,0x0,0x0,0x0, // compression
34	0xb0,0x71,0x0b,0x0, // size of image 750000
35	0x0,0x0,0x0,0x0, // xres
36	0x0,0x0,0x0,0x0, // yres
37	0x0,0x0,0x0,0x0, // number of colortables
38	0x0,0x0,0x0,0x0 // number of important colors
39	};
40
41
42	void printErrorAndExit(const char *msg, DWORD err) {
43	LPSTR lpMsgBuf;
44	if(FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER\|
45	FORMAT_MESSAGE_FROM_SYSTEM \|
46	FORMAT_MESSAGE_IGNORE_INSERTS,
47	NULL,
48	err,
49	MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), // Default language
50	(LPTSTR) &lpMsgBuf,
51	0,
52	NULL ))
53	{
54	fprintf(stderr,"%s : %s\n",msg,lpMsgBuf);
55	LocalFree(lpMsgBuf);
56	}
57	else
58	{
59	fprintf(stderr,"Error at FormatMesage: %d\n",err=GetLastError());
60	}
61	exit(err);
62	}
63
64
65	void write_blank_file(char *filename) {
66
67	FILE *fd;
68	int len, i, img_size;
69
70	// open file handle
71	fd = fopen(filename, "wb+");
72	if (NULL == fd) {
73	perror("open");
74	exit(1);
75	}
76
77	// write bmp header to file
78	len = fwrite(header, 1, sizeof(header), fd);
79
80	// error checking
81	if (-1 == len \|\| len != sizeof(header)) {
82	perror("write");
83	exit(2);
84	}
85
86	// write three null-bytes for each pixel to file to create a black picture
87	img_size = XSIZE * YSIZE;
88	for (i = 0; i < img_size; i++) {
89	len = fwrite("\0\0\0", 1, 3, fd);
90	if (-1 == len \|\| len != 3) {
91	perror("write");
92	exit(4);
93	}
94	}
95
96	// close file handle
97	fclose(fd);
98	}
99
100
101	// arguments for each thread
102	typedef struct _WorkerArguments {
103	int start_row;
104	int number_of_rows;
105	unsigned char * pBitmap;
106	} WORKERARGS, *PWORKERARGS;
107
108	// worker thread - main entry function
109	DWORD WINAPI fractal_create_segment (LPVOID lpParam) {
110
111	// thread stuff
112	int thread_id;
113	PWORKERARGS args;
114	unsigned char *pDataBitmapSegment;
115
116	// fractal calculation
117	int x, y;
118	char bgr[3];
119
120	thread_id = GetCurrentThreadId();
121
122	// get worker arguments
123	args = (PWORKERARGS)lpParam;
124
125	// calculate pointer to beginning of segment
126	pDataBitmapSegment = (unsigned char )((INT_PTR)args->pBitmap + (YSIZE - (args->start_row + args->number_of_rows)) 3 * XSIZE);
127
128	// debugging
129	if (VERBOSE) {
130	printf("----------------------------------------------\n");
131	printf("thread_id: %i\n", thread_id);
132	printf("arg.start_row: %i\n", args->start_row);
133	printf("arg.number_of_rows: %i\n", args->number_of_rows);
134	printf("segment_start: %p\n", pDataBitmapSegment);
135	}
136
137	// calculate fractal
138	for (y = (args->start_row + args->number_of_rows) - 1; y >= args->start_row; y--) {
139	//printf("calc: thread=%i; y=%i limits: %i,%i p: %p\n", thread_id, y, args->start_row, args->number_of_rows, pDataBitmapSegment);
140	for (x = 0; x < XSIZE; x++) {
141	getColorValuesAt(x * (2.0 / XSIZE) - 1.5, y * (2.0 / YSIZE) - 1.0, &bgr[2], &bgr[1], &bgr[0]);
142
143	// transfer color values to current pixel
144	pDataBitmapSegment[0] = bgr[0];
145	pDataBitmapSegment[1] = bgr[1];
146	pDataBitmapSegment[2] = bgr[2];
147
148	// move pointer to next pixel
149	pDataBitmapSegment += 3;
150
151	}
152	//no padding required because 1500%4 =0 ???
153	}
154
155	if (VERBOSE)
156	printf("thread finished: %i\n", thread_id);
157	return 0;
158
159	}
160
161
162	int main(int argc, char *argv[]) {
163
164	// MMF support
165	DWORD err;
166	HANDLE hMap, hFile;
167	LPVOID pData;
168	unsigned char *pDataBitmap;
169
170	// workers
171	int workers = 5;
172	int worker_index, worker_rows, worker_startrow;
173	HANDLE *worker_handles;
174	PWORKERARGS worker_args;
175
176	// threads or processes?
177	BOOL use_processes = TRUE;
178	int worker_id = MASTER;
179
180	// information for creating processes
181	STARTUPINFO si;
182	PROCESS_INFORMATION pi;
183	char szCmdline[1024];
184
185
186	// "parse" command line arguments
187	if (argc >= 2) {
188	worker_id = atoi(argv[1]);
189	}
190
191	if (VERBOSE) {
192	printf("==============================================================\n");
193	printf("worker-id: %i\n", worker_id);
194	}
195
196	// create empty bmp-file (black background)
197	if (worker_id == MASTER)
198	write_blank_file("test.bmp");
199
200	if (worker_id == MASTER) {
201
202	/* open file for reading and writing */
203	hFile = CreateFile("test.bmp", GENERIC_WRITE\|GENERIC_READ, 0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
204	if (INVALID_HANDLE_VALUE == hFile) {
205	err = GetLastError();
206	printErrorAndExit("Error at CreateFile",err);
207	}
208
209	/* create the file mapping object */
210	hMap = CreateFileMapping(hFile, NULL, PAGE_READWRITE, 0, 0, "bmp_fractal");
211	if (NULL == hMap) {
212	printErrorAndExit("Error at CreateFileMapping", GetLastError());
213	}
214
215	} else {
216
217	// open existing mapping object
218	hMap = OpenFileMapping(FILE_MAP_WRITE, FALSE, "bmp_fractal");
219	if (NULL == hMap)
220	printErrorAndExit("Error at OpenFileMapping", GetLastError());
221	}
222
223	/* map the whole file into the process context */
224	pData = MapViewOfFile(hMap, FILE_MAP_WRITE, 0, 0, 0);
225	if (NULL == pData) {
226	printErrorAndExit("Error at MapViewOfFile", GetLastError());
227	}
228
229
230	// calculate pointer to beginning of bitmap
231	pDataBitmap = (unsigned char *)((INT_PTR)pData + sizeof(header));
232
233	// debugging
234	if (VERBOSE) {
235	printf("pos. of file: %p\n", pData);
236	printf("pos. of bitmap: %p\n", pDataBitmap);
237	}
238
239
240	if (use_processes && worker_id != MASTER) {
241
242	if (VERBOSE)
243	printf("inside worker-process\n");
244
245	worker_index = worker_id;
246
247	worker_startrow = atoi(argv[2]);
248	worker_rows = atoi(argv[3]);
249
250	// allocate memory for one worker's arguments
251	if ((worker_args = malloc(sizeof(worker_args[0]))) == NULL)
252	perror("malloc"), exit(1);
253
254	// assign worker's arguments
255	worker_args[0].start_row = worker_startrow;
256	worker_args[0].number_of_rows = worker_rows;
257	worker_args[0].pBitmap = pDataBitmap;
258
259	fractal_create_segment(&worker_args[0]);
260
261	return 0;
262	}
263
264	/*
265	// turn bitmap into white canvas
266	for (offset = 0; offset < 500 * 500 * 3; offset++) {
267	*pDataBitmap = 255;
268	pDataBitmap++;
269	}
270	exit(0);
271	*/
272
273	// allocate memory for bitmap
274	/*
275	if ((pDataBitmap = malloc(XSIZE * YSIZE * 3 * sizeof(pDataBitmap[0]))) == NULL)
276	perror("malloc"), exit(1);
277	*/
278
279	// allocate memory for table of all worker handles
280	if ((worker_handles = malloc(workers * sizeof(worker_handles[0]))) == NULL)
281	perror("malloc"), exit(1);
282
283	// allocate memory for table of all worker arguments
284	if ((worker_args = malloc(workers * sizeof(worker_args[0]))) == NULL)
285	perror("malloc"), exit(1);
286
287
288	// calculate bitmap segment length for workers
289	worker_rows = YSIZE / workers;
290	if (VERBOSE)
291	printf("rows for each worker: %i\n", worker_rows);
292
293	// start workers
294	for (worker_index = 0; worker_index < workers; worker_index++) {
295
296	// debugging: just run single thread
297	//if (worker_index == 1)
298	// continue;
299
300	// number of row to start for each worker
301	worker_startrow = worker_index * worker_rows;
302
303	// recalculate number of rows for last worker if (YSIZE mod workers) != 0
304	if (worker_index == workers - 1) {
305	worker_rows = YSIZE - worker_startrow;
306	if (VERBOSE)
307	printf("rows for last worker: %i\n", worker_rows);
308	}
309
310	// assign each worker's arguments
311	worker_args[worker_index].start_row = worker_startrow;
312	worker_args[worker_index].number_of_rows = worker_rows;
313	worker_args[worker_index].pBitmap = pDataBitmap;
314
315	if (!use_processes) {
316
317	worker_handles[worker_index] = CreateThread(
318	NULL, // LPSECURITY_ATTRIBUTES lpThreadAttributes,
319	0, // SIZE_T dwStackSize,
320	&fractal_create_segment, // LPTHREAD_START_ROUTINE lpStartAddress,
321	&worker_args[worker_index], // LPVOID lpParameter,
322	0, // DWORD dwCreationFlags,
323	NULL // LPDWORD lpThreadId
324	);
325
326	if (!worker_handles[worker_index])
327	printErrorAndExit("CreateThread failed", GetLastError());
328
329	} else {
330
331	_snprintf(szCmdline, 1023, "%s %i %i %i", argv[0], worker_index + 1, worker_startrow, worker_rows);
332	ZeroMemory( &si, sizeof(si) );
333	si.cb = sizeof(si);
334	ZeroMemory( &pi, sizeof(pi) );
335
336	if (!CreateProcess(
337	NULL, // No module name (use command line)
338	szCmdline, // Command line
339	NULL, // Process handle not inheritable
340	NULL, // Thread handle not inheritable
341	FALSE, // Set handle inheritance to FALSE
342	0, // No creation flags
343	NULL, // Use parent's environment block
344	NULL, // Use parent's starting directory
345	&si, // Pointer to STARTUPINFO structure
346	&pi // Pointer to PROCESS_INFORMATION structure
347	))
348	printErrorAndExit("CreateProcess failed", GetLastError());
349
350	worker_handles[worker_index] = pi.hProcess;
351
352	}
353
354	}
355
356	// wait for all threads
357	if (VERBOSE)
358	printf("waiting for workers to finish...\n");
359	if (WaitForMultipleObjects(workers, worker_handles, TRUE, INFINITE) == WAIT_FAILED)
360	perror("WaitForMultipleObjects");
361
362	// debugging: just run single thread
363	//if (WaitForSingleObject(worker_handles[0], INFINITE) == WAIT_FAILED)
364	// perror("WaitForSingleObject");
365
366	// close all worker handles
367	for (worker_index = 0; worker_index < workers; worker_index++)
368	CloseHandle(worker_handles[worker_index]);
369
370	/* write the result into the file */
371	if (!FlushViewOfFile(pData, 0)) {
372	err = GetLastError();
373	printErrorAndExit("Error at UnmapViewOfFile", err);
374	}
375
376	/* remove the mapped file */
377	if (!UnmapViewOfFile(pData)) {
378	err = GetLastError();
379	printErrorAndExit("Error at UnmapViewOfFile", err);
380	exit(err);
381	}
382
383	/* cleanup handles */
384	if (!CloseHandle(hMap) \|\| !CloseHandle(hFile) ) {
385	err = GetLastError();
386	printErrorAndExit("Error at CloseHandle", err);
387	}
388
389	free(worker_args);
390	free(worker_handles);
391
392	return 0;
393
394	}
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