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	joko	1.1	/* Betriebssystem & Middleware
2			*
3			* Betriebssystemarchitektur SS 2006
4			*
5			* Uebung 4.4
6			*/
7	joko	1.3
8	joko	1.10	// $Id: bmp_fractal.c,v 1.9 2006/07/02 00:24:17 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	1.10	#define MASTER -1
19
20			BOOL VERBOSE = TRUE;
21	joko	1.9
22	joko	1.3
23	joko	1.2	/* BMP Header */
24	joko	1.1	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	joko	1.3
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	joko	1.1	}
94	joko	1.3	}
95
96			// close file handle
97			fclose(fd);
98			}
99
100
101	joko	1.6	// arguments for each thread
102			typedef struct _WorkerArguments {
103	joko	1.7	int start_row;
104			int number_of_rows;
105	joko	1.6	unsigned char * pBitmap;
106			} WORKERARGS, *PWORKERARGS;
107
108			// worker thread - main entry function
109	joko	1.10	DWORD WINAPI fractal_create_segment (LPVOID lpParam) {
110	joko	1.6
111			// thread stuff
112			int thread_id;
113			PWORKERARGS args;
114	joko	1.7	unsigned char *pDataBitmapSegment;
115	joko	1.6
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	joko	1.7
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	joko	1.9
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	joko	1.6
137			// calculate fractal
138			for (y = (args->start_row + args->number_of_rows) - 1; y >= args->start_row; y--) {
139	joko	1.7	//printf("calc: thread=%i; y=%i limits: %i,%i p: %p\n", thread_id, y, args->start_row, args->number_of_rows, pDataBitmapSegment);
140	joko	1.6	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	joko	1.7	pDataBitmapSegment[0] = bgr[0];
145			pDataBitmapSegment[1] = bgr[1];
146			pDataBitmapSegment[2] = bgr[2];
147	joko	1.6
148			// move pointer to next pixel
149	joko	1.7	pDataBitmapSegment += 3;
150	joko	1.6
151			}
152	joko	1.9	//no padding required because 1500%4 =0 ???
153	joko	1.6	}
154
155	joko	1.9	if (VERBOSE)
156			printf("thread finished: %i\n", thread_id);
157	joko	1.6	return 0;
158
159			}
160
161
162	joko	1.3	int main(int argc, char *argv[]) {
163
164	joko	1.4	// MMF support
165			DWORD err;
166	joko	1.3	HANDLE hMap, hFile;
167			LPVOID pData;
168	joko	1.9	unsigned char *pDataBitmap;
169	joko	1.4
170	joko	1.5	// workers
171	joko	1.10	int workers = 5;
172	joko	1.7	int worker_index, worker_rows, worker_startrow;
173	joko	1.6	HANDLE *worker_handles;
174			PWORKERARGS worker_args;
175
176	joko	1.10	// 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	joko	1.3
196	joko	1.4	// create empty bmp-file (black background)
197	joko	1.10	if (worker_id == MASTER)
198			write_blank_file("test.bmp");
199	joko	1.3
200	joko	1.10	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	joko	1.3
209	joko	1.10	/* 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	joko	1.3	}
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	joko	1.9	if (VERBOSE) {
235			printf("pos. of file: %p\n", pData);
236			printf("pos. of bitmap: %p\n", pDataBitmap);
237			}
238	joko	1.3
239	joko	1.10
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	joko	1.3	/*
265	joko	1.9	// turn bitmap into white canvas
266	joko	1.3	for (offset = 0; offset < 500 * 500 * 3; offset++) {
267	joko	1.9	*pDataBitmap = 255;
268			pDataBitmap++;
269	joko	1.3	}
270	joko	1.9	exit(0);
271	joko	1.3	*/
272
273	joko	1.9	// allocate memory for bitmap
274			/*
275			if ((pDataBitmap = malloc(XSIZE * YSIZE * 3 * sizeof(pDataBitmap[0]))) == NULL)
276			perror("malloc"), exit(1);
277			*/
278
279	joko	1.6	// allocate memory for table of all worker handles
280	joko	1.9	if ((worker_handles = malloc(workers * sizeof(worker_handles[0]))) == NULL)
281	joko	1.6	perror("malloc"), exit(1);
282
283			// allocate memory for table of all worker arguments
284	joko	1.9	if ((worker_args = malloc(workers * sizeof(worker_args[0]))) == NULL)
285	joko	1.6	perror("malloc"), exit(1);
286	joko	1.8
287	joko	1.6
288	joko	1.10	// calculate bitmap segment length for workers
289	joko	1.5	worker_rows = YSIZE / workers;
290	joko	1.9	if (VERBOSE)
291			printf("rows for each worker: %i\n", worker_rows);
292	joko	1.10
293			// start workers
294	joko	1.5	for (worker_index = 0; worker_index < workers; worker_index++) {
295
296	joko	1.9	// debugging: just run single thread
297	joko	1.7	//if (worker_index == 1)
298			// continue;
299
300	joko	1.5	// 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	joko	1.9	if (VERBOSE)
307			printf("rows for last worker: %i\n", worker_rows);
308	joko	1.5	}
309	joko	1.6
310	joko	1.10	// assign each worker's arguments
311	joko	1.6	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	joko	1.10	if (!use_processes) {
316	joko	1.6
317	joko	1.10	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	joko	1.5	}
355
356	joko	1.6	// wait for all threads
357	joko	1.9	if (VERBOSE)
358	joko	1.10	printf("waiting for workers to finish...\n");
359	joko	1.6	if (WaitForMultipleObjects(workers, worker_handles, TRUE, INFINITE) == WAIT_FAILED)
360			perror("WaitForMultipleObjects");
361	joko	1.7
362	joko	1.9	// debugging: just run single thread
363	joko	1.7	//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	joko	1.3	/* 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	joko	1.1
389	joko	1.9	free(worker_args);
390			free(worker_handles);
391	joko	1.8
392			return 0;
393
394	joko	1.1	}
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