BSArch/04/bmp_fractal.c

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

// $Id: bmp_fractal.c,v 1.11 2006/07/02 02:12:27 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;

}


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;
  BOOL is_worker_process = FALSE;
  
  // information for creating processes
  STARTUPINFO si;
  PROCESS_INFORMATION pi;
  char szCmdline[1024];
  
  
  VERBOSE = TRUE;
  
  // "parse" command line arguments
  if (argc >= 2) {
    if (strcmp(argv[1], "--worker") == 0) {
      is_worker_process = TRUE;
    }
  }
  
  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	joko	1.1	/* Betriebssystem & Middleware
2			*
3			* Betriebssystemarchitektur SS 2006
4			*
5			* Uebung 4.4
6			*/
7	joko	1.3
8	joko	1.12	// $Id: bmp_fractal.c,v 1.11 2006/07/02 02:12:27 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	1.11	BOOL VERBOSE = FALSE;
19	joko	1.9
20	joko	1.3
21	joko	1.2	/* BMP Header */
22	joko	1.1	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	joko	1.3
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	joko	1.11	fprintf(stdout, "%s: %s\n", msg, lpMsgBuf);
53	joko	1.3	LocalFree(lpMsgBuf);
54			}
55			else
56			{
57	joko	1.11	fprintf(stdout, "Error at FormatMesage: %d\n",err=GetLastError());
58	joko	1.3	}
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	joko	1.1	}
92	joko	1.3	}
93
94			// close file handle
95			fclose(fd);
96			}
97
98
99	joko	1.6	// arguments for each thread
100			typedef struct _WorkerArguments {
101	joko	1.7	int start_row;
102			int number_of_rows;
103	joko	1.6	unsigned char * pBitmap;
104			} WORKERARGS, *PWORKERARGS;
105
106			// worker thread - main entry function
107	joko	1.10	DWORD WINAPI fractal_create_segment (LPVOID lpParam) {
108	joko	1.6
109			// thread stuff
110			int thread_id;
111			PWORKERARGS args;
112	joko	1.7	unsigned char *pDataBitmapSegment;
113	joko	1.6
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	joko	1.7
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	joko	1.9
126			// debugging
127			if (VERBOSE) {
128	joko	1.11	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	joko	1.9	}
134	joko	1.6
135			// calculate fractal
136			for (y = (args->start_row + args->number_of_rows) - 1; y >= args->start_row; y--) {
137	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);
138	joko	1.6	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	joko	1.7	pDataBitmapSegment[0] = bgr[0];
143			pDataBitmapSegment[1] = bgr[1];
144			pDataBitmapSegment[2] = bgr[2];
145	joko	1.6
146			// move pointer to next pixel
147	joko	1.7	pDataBitmapSegment += 3;
148	joko	1.6
149			}
150	joko	1.9	//no padding required because 1500%4 =0 ???
151	joko	1.6	}
152
153	joko	1.9	if (VERBOSE)
154	joko	1.11	fprintf(stdout, "thread finished: %i\n", thread_id);
155	joko	1.6	return 0;
156
157			}
158
159
160	joko	1.3	int main(int argc, char *argv[]) {
161
162	joko	1.4	// MMF support
163			DWORD err;
164	joko	1.3	HANDLE hMap, hFile;
165			LPVOID pData;
166	joko	1.9	unsigned char *pDataBitmap;
167	joko	1.4
168	joko	1.5	// workers
169	joko	1.10	int workers = 5;
170	joko	1.7	int worker_index, worker_rows, worker_startrow;
171	joko	1.6	HANDLE *worker_handles;
172			PWORKERARGS worker_args;
173
174	joko	1.10	// threads or processes?
175			BOOL use_processes = TRUE;
176	joko	1.12	BOOL is_worker_process = FALSE;
177	joko	1.10
178			// information for creating processes
179			STARTUPINFO si;
180			PROCESS_INFORMATION pi;
181			char szCmdline[1024];
182
183
184	joko	1.11	VERBOSE = TRUE;
185
186	joko	1.10	// "parse" command line arguments
187			if (argc >= 2) {
188	joko	1.11	if (strcmp(argv[1], "--worker") == 0) {
189	joko	1.12	is_worker_process = TRUE;
190	joko	1.11	}
191	joko	1.10	}
192
193	joko	1.11	if (VERBOSE && use_processes) {
194			fprintf(stdout, "===================================================== ");
195	joko	1.12	if (is_worker_process)
196	joko	1.11	fprintf(stdout, "WORKER-PROCESS\n");
197			else
198			fprintf(stdout, "MASTER-PROCESS\n");
199	joko	1.10	}
200	joko	1.3
201	joko	1.4	// create empty bmp-file (black background)
202	joko	1.12	if (!is_worker_process)
203	joko	1.10	write_blank_file("test.bmp");
204	joko	1.3
205	joko	1.12	// master creates memory mapped file
206			if (!is_worker_process) {
207	joko	1.10
208	joko	1.12	// open file for reading and writing
209	joko	1.10	hFile = CreateFile("test.bmp", GENERIC_WRITE\|GENERIC_READ, 0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
210			if (INVALID_HANDLE_VALUE == hFile) {
211			err = GetLastError();
212			printErrorAndExit("Error at CreateFile",err);
213			}
214	joko	1.3
215	joko	1.12	// create the file mapping object
216	joko	1.10	hMap = CreateFileMapping(hFile, NULL, PAGE_READWRITE, 0, 0, "bmp_fractal");
217			if (NULL == hMap) {
218			printErrorAndExit("Error at CreateFileMapping", GetLastError());
219			}
220	joko	1.12
221			// worker uses existing memory mapped file
222	joko	1.10	} else {
223
224			// open existing mapping object
225			hMap = OpenFileMapping(FILE_MAP_WRITE, FALSE, "bmp_fractal");
226			if (NULL == hMap)
227			printErrorAndExit("Error at OpenFileMapping", GetLastError());
228	joko	1.3	}
229
230	joko	1.12	// map the whole file into the process context
231	joko	1.3	pData = MapViewOfFile(hMap, FILE_MAP_WRITE, 0, 0, 0);
232			if (NULL == pData) {
233			printErrorAndExit("Error at MapViewOfFile", GetLastError());
234			}
235
236
237			// calculate pointer to beginning of bitmap
238			pDataBitmap = (unsigned char *)((INT_PTR)pData + sizeof(header));
239
240			// debugging
241	joko	1.9	if (VERBOSE) {
242	joko	1.11	fprintf(stdout, "pos. of file: %p\n", pData);
243			fprintf(stdout, "pos. of bitmap: %p\n", pDataBitmap);
244	joko	1.9	}
245	joko	1.3
246	joko	1.10
247	joko	1.12	if (use_processes && is_worker_process) {
248	joko	1.10
249			if (VERBOSE)
250	joko	1.11	fprintf(stdout, "inside worker-process\n");
251	joko	1.10
252	joko	1.11	// get segment information from command line
253	joko	1.10	worker_startrow = atoi(argv[2]);
254			worker_rows = atoi(argv[3]);
255
256			// allocate memory for one worker's arguments
257			if ((worker_args = malloc(sizeof(worker_args[0]))) == NULL)
258			perror("malloc"), exit(1);
259
260			// assign worker's arguments
261			worker_args[0].start_row = worker_startrow;
262			worker_args[0].number_of_rows = worker_rows;
263			worker_args[0].pBitmap = pDataBitmap;
264
265			fractal_create_segment(&worker_args[0]);
266	joko	1.12
267			// cleanup mmap-handle
268			if (!CloseHandle(hMap))
269			printErrorAndExit("Error at CloseHandle", GetLastError());
270	joko	1.10
271			return 0;
272			}
273
274	joko	1.3	/*
275	joko	1.9	// turn bitmap into white canvas
276	joko	1.3	for (offset = 0; offset < 500 * 500 * 3; offset++) {
277	joko	1.9	*pDataBitmap = 255;
278			pDataBitmap++;
279	joko	1.3	}
280	joko	1.9	exit(0);
281	joko	1.3	*/
282
283	joko	1.9	// allocate memory for bitmap
284			/*
285			if ((pDataBitmap = malloc(XSIZE * YSIZE * 3 * sizeof(pDataBitmap[0]))) == NULL)
286			perror("malloc"), exit(1);
287			*/
288
289	joko	1.6	// allocate memory for table of all worker handles
290	joko	1.9	if ((worker_handles = malloc(workers * sizeof(worker_handles[0]))) == NULL)
291	joko	1.6	perror("malloc"), exit(1);
292
293			// allocate memory for table of all worker arguments
294	joko	1.9	if ((worker_args = malloc(workers * sizeof(worker_args[0]))) == NULL)
295	joko	1.6	perror("malloc"), exit(1);
296	joko	1.8
297	joko	1.6
298	joko	1.10	// calculate bitmap segment length for workers
299	joko	1.5	worker_rows = YSIZE / workers;
300	joko	1.9	if (VERBOSE)
301	joko	1.11	fprintf(stdout, "rows for each worker: %i\n", worker_rows);
302	joko	1.10
303			// start workers
304	joko	1.5	for (worker_index = 0; worker_index < workers; worker_index++) {
305
306	joko	1.9	// debugging: just run single thread
307	joko	1.7	//if (worker_index == 1)
308			// continue;
309
310	joko	1.5	// number of row to start for each worker
311			worker_startrow = worker_index * worker_rows;
312
313			// recalculate number of rows for last worker if (YSIZE mod workers) != 0
314			if (worker_index == workers - 1) {
315			worker_rows = YSIZE - worker_startrow;
316	joko	1.9	if (VERBOSE)
317	joko	1.11	fprintf(stdout, "rows for last worker: %i\n", worker_rows);
318	joko	1.5	}
319	joko	1.6
320	joko	1.10	// assign each worker's arguments
321	joko	1.6	worker_args[worker_index].start_row = worker_startrow;
322			worker_args[worker_index].number_of_rows = worker_rows;
323			worker_args[worker_index].pBitmap = pDataBitmap;
324
325	joko	1.10	if (!use_processes) {
326	joko	1.6
327	joko	1.10	worker_handles[worker_index] = CreateThread(
328			NULL, // LPSECURITY_ATTRIBUTES lpThreadAttributes,
329			0, // SIZE_T dwStackSize,
330			&fractal_create_segment, // LPTHREAD_START_ROUTINE lpStartAddress,
331			&worker_args[worker_index], // LPVOID lpParameter,
332			0, // DWORD dwCreationFlags,
333			NULL // LPDWORD lpThreadId
334			);
335
336			if (!worker_handles[worker_index])
337			printErrorAndExit("CreateThread failed", GetLastError());
338
339			} else {
340
341	joko	1.11	_snprintf(szCmdline, 1023, "%s %s %i %i", argv[0], "--worker", worker_startrow, worker_rows);
342			if (VERBOSE)
343			fprintf(stdout, "starting worker process: %s\n", szCmdline);
344	joko	1.10	ZeroMemory( &si, sizeof(si) );
345			si.cb = sizeof(si);
346			ZeroMemory( &pi, sizeof(pi) );
347
348			if (!CreateProcess(
349			NULL, // No module name (use command line)
350			szCmdline, // Command line
351			NULL, // Process handle not inheritable
352			NULL, // Thread handle not inheritable
353			FALSE, // Set handle inheritance to FALSE
354			0, // No creation flags
355			NULL, // Use parent's environment block
356			NULL, // Use parent's starting directory
357			&si, // Pointer to STARTUPINFO structure
358			&pi // Pointer to PROCESS_INFORMATION structure
359			))
360			printErrorAndExit("CreateProcess failed", GetLastError());
361
362			worker_handles[worker_index] = pi.hProcess;
363
364			}
365
366	joko	1.5	}
367
368	joko	1.6	// wait for all threads
369	joko	1.9	if (VERBOSE)
370	joko	1.11	fprintf(stdout, "waiting for workers to finish...\n");
371	joko	1.6	if (WaitForMultipleObjects(workers, worker_handles, TRUE, INFINITE) == WAIT_FAILED)
372			perror("WaitForMultipleObjects");
373	joko	1.7
374	joko	1.9	// debugging: just run single thread
375	joko	1.7	//if (WaitForSingleObject(worker_handles[0], INFINITE) == WAIT_FAILED)
376			// perror("WaitForSingleObject");
377
378			// close all worker handles
379			for (worker_index = 0; worker_index < workers; worker_index++)
380			CloseHandle(worker_handles[worker_index]);
381
382	joko	1.12	// write the result into the file
383	joko	1.3	if (!FlushViewOfFile(pData, 0)) {
384			err = GetLastError();
385			printErrorAndExit("Error at UnmapViewOfFile", err);
386			}
387
388	joko	1.12	// remove the mapped file
389	joko	1.3	if (!UnmapViewOfFile(pData)) {
390			err = GetLastError();
391			printErrorAndExit("Error at UnmapViewOfFile", err);
392			exit(err);
393			}
394
395	joko	1.12	// cleanup handles
396	joko	1.3	if (!CloseHandle(hMap) \|\| !CloseHandle(hFile) ) {
397			err = GetLastError();
398			printErrorAndExit("Error at CloseHandle", err);
399			}
400	joko	1.1
401	joko	1.9	free(worker_args);
402			free(worker_handles);
403	joko	1.8
404			return 0;
405
406	joko	1.1	}
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