15 |
#define YSIZE 500 |
#define YSIZE 500 |
16 |
#include "algorithm.h" |
#include "algorithm.h" |
17 |
|
|
18 |
|
#define VERBOSE_HANDLE "stderr"; |
19 |
|
|
20 |
|
BOOL VERBOSE = FALSE; |
21 |
|
|
22 |
|
|
23 |
/* BMP Header */ |
/* BMP Header */ |
24 |
unsigned char header[54]={0x42,0x4d, // signature BM |
unsigned char header[54]={0x42,0x4d, // signature BM |
51 |
0, |
0, |
52 |
NULL )) |
NULL )) |
53 |
{ |
{ |
54 |
fprintf(stderr,"%s : %s\n",msg,lpMsgBuf); |
fprintf(stdout, "%s: %s\n", msg, lpMsgBuf); |
55 |
LocalFree(lpMsgBuf); |
LocalFree(lpMsgBuf); |
56 |
} |
} |
57 |
else |
else |
58 |
{ |
{ |
59 |
fprintf(stderr,"Error at FormatMesage: %d\n",err=GetLastError()); |
fprintf(stdout, "Error at FormatMesage: %d\n",err=GetLastError()); |
60 |
} |
} |
61 |
exit(err); |
exit(err); |
62 |
} |
} |
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 |
|
fprintf(stdout, "----------------------------------------------\n"); |
131 |
|
fprintf(stdout, "thread_id: %i\n", thread_id); |
132 |
|
fprintf(stdout, "arg.start_row: %i\n", args->start_row); |
133 |
|
fprintf(stdout, "arg.number_of_rows: %i\n", args->number_of_rows); |
134 |
|
fprintf(stdout, "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 |
|
//fprintf(stdout, "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 |
|
fprintf(stdout, "thread finished: %i\n", thread_id); |
157 |
|
return 0; |
158 |
|
|
159 |
|
} |
160 |
|
|
161 |
|
|
162 |
int main(int argc, char *argv[]) { |
int main(int argc, char *argv[]) { |
163 |
|
|
164 |
// MMF support |
// MMF support |
165 |
DWORD err; |
DWORD err; |
166 |
HANDLE hMap, hFile; |
HANDLE hMap, hFile; |
167 |
LPVOID pData; |
LPVOID pData; |
168 |
unsigned char *pDataBitmap, *pDataBitmapCurrent; |
unsigned char *pDataBitmap; |
169 |
|
|
170 |
// workers |
// workers |
171 |
unsigned int workers = 3; |
int workers = 5; |
172 |
unsigned int worker_index, worker_rows, worker_startrow; |
int worker_index, worker_rows, worker_startrow; |
173 |
|
HANDLE *worker_handles; |
174 |
// fractal calculation |
PWORKERARGS worker_args; |
175 |
int x, y; |
|
176 |
char bgr[3]; |
// threads or processes? |
177 |
|
BOOL use_processes = TRUE; |
178 |
|
BOOL is_worker = FALSE; |
179 |
|
|
180 |
|
// information for creating processes |
181 |
|
STARTUPINFO si; |
182 |
|
PROCESS_INFORMATION pi; |
183 |
|
char szCmdline[1024]; |
184 |
|
|
185 |
|
|
186 |
|
VERBOSE = TRUE; |
187 |
|
|
188 |
|
// "parse" command line arguments |
189 |
|
if (argc >= 2) { |
190 |
|
if (strcmp(argv[1], "--worker") == 0) { |
191 |
|
is_worker = TRUE; |
192 |
|
} |
193 |
|
} |
194 |
|
|
195 |
|
if (VERBOSE && use_processes) { |
196 |
|
fprintf(stdout, "===================================================== "); |
197 |
|
if (is_worker) |
198 |
|
fprintf(stdout, "WORKER-PROCESS\n"); |
199 |
|
else |
200 |
|
fprintf(stdout, "MASTER-PROCESS\n"); |
201 |
|
} |
202 |
|
|
203 |
// create empty bmp-file (black background) |
// create empty bmp-file (black background) |
204 |
write_blank_file("test.bmp"); |
if (!is_worker) |
205 |
|
write_blank_file("test.bmp"); |
206 |
|
|
207 |
/* open file for reading and writing */ |
if (!is_worker) { |
208 |
hFile = CreateFile("test.bmp", GENERIC_WRITE|GENERIC_READ, 0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL); |
|
209 |
if (INVALID_HANDLE_VALUE == hFile) { |
/* open file for reading and writing */ |
210 |
err = GetLastError(); |
hFile = CreateFile("test.bmp", GENERIC_WRITE|GENERIC_READ, 0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL); |
211 |
printErrorAndExit("Error at CreateFile",err); |
if (INVALID_HANDLE_VALUE == hFile) { |
212 |
} |
err = GetLastError(); |
213 |
|
printErrorAndExit("Error at CreateFile",err); |
214 |
|
} |
215 |
|
|
216 |
/* create the file mapping object */ |
/* create the file mapping object */ |
217 |
hMap = CreateFileMapping(hFile, NULL, PAGE_READWRITE, 0, 0, NULL); |
hMap = CreateFileMapping(hFile, NULL, PAGE_READWRITE, 0, 0, "bmp_fractal"); |
218 |
if (NULL == hMap) { |
if (NULL == hMap) { |
219 |
printErrorAndExit("Error at CreateFileMapping", GetLastError()); |
printErrorAndExit("Error at CreateFileMapping", GetLastError()); |
220 |
|
} |
221 |
|
|
222 |
|
} 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 |
} |
} |
229 |
|
|
230 |
/* map the whole file into the process context */ |
/* map the whole file into the process context */ |
238 |
pDataBitmap = (unsigned char *)((INT_PTR)pData + sizeof(header)); |
pDataBitmap = (unsigned char *)((INT_PTR)pData + sizeof(header)); |
239 |
|
|
240 |
// debugging |
// debugging |
241 |
printf("pos. of file: %p\n", pData); |
if (VERBOSE) { |
242 |
printf("pos. of bitmap: %p\n", pDataBitmap); |
fprintf(stdout, "pos. of file: %p\n", pData); |
243 |
|
fprintf(stdout, "pos. of bitmap: %p\n", pDataBitmap); |
244 |
|
} |
245 |
|
|
246 |
// pointer to current pixel |
|
247 |
pDataBitmapCurrent = pDataBitmap; |
if (use_processes && is_worker) { |
248 |
|
|
249 |
|
if (VERBOSE) |
250 |
|
fprintf(stdout, "inside worker-process\n"); |
251 |
|
|
252 |
|
// get segment information from command line |
253 |
|
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 |
|
|
267 |
|
return 0; |
268 |
|
} |
269 |
|
|
270 |
/* |
/* |
271 |
// turn bitmap into white wand |
// turn bitmap into white canvas |
272 |
for (offset = 0; offset < 500 * 500 * 3; offset++) { |
for (offset = 0; offset < 500 * 500 * 3; offset++) { |
273 |
//pDataBitmap[offset] = 255; |
*pDataBitmap = 255; |
274 |
*pDataBitmapCurrent = 255; |
pDataBitmap++; |
|
pDataBitmapCurrent++; |
|
275 |
} |
} |
276 |
|
exit(0); |
277 |
*/ |
*/ |
278 |
|
|
279 |
// calculate segments of bitmap for worker threads/processes |
// allocate memory for bitmap |
280 |
|
/* |
281 |
|
if ((pDataBitmap = malloc(XSIZE * YSIZE * 3 * sizeof(pDataBitmap[0]))) == NULL) |
282 |
|
perror("malloc"), exit(1); |
283 |
|
*/ |
284 |
|
|
285 |
|
// allocate memory for table of all worker handles |
286 |
|
if ((worker_handles = malloc(workers * sizeof(worker_handles[0]))) == NULL) |
287 |
|
perror("malloc"), exit(1); |
288 |
|
|
289 |
|
// allocate memory for table of all worker arguments |
290 |
|
if ((worker_args = malloc(workers * sizeof(worker_args[0]))) == NULL) |
291 |
|
perror("malloc"), exit(1); |
292 |
|
|
293 |
|
|
294 |
|
// calculate bitmap segment length for workers |
295 |
worker_rows = YSIZE / workers; |
worker_rows = YSIZE / workers; |
296 |
printf("rows for each worker: %i\n", worker_rows); |
if (VERBOSE) |
297 |
|
fprintf(stdout, "rows for each worker: %i\n", worker_rows); |
298 |
|
|
299 |
|
// start workers |
300 |
for (worker_index = 0; worker_index < workers; worker_index++) { |
for (worker_index = 0; worker_index < workers; worker_index++) { |
301 |
|
|
302 |
|
// debugging: just run single thread |
303 |
|
//if (worker_index == 1) |
304 |
|
// continue; |
305 |
|
|
306 |
// number of row to start for each worker |
// number of row to start for each worker |
307 |
worker_startrow = worker_index * worker_rows; |
worker_startrow = worker_index * worker_rows; |
308 |
|
|
309 |
// recalculate number of rows for last worker if (YSIZE mod workers) != 0 |
// recalculate number of rows for last worker if (YSIZE mod workers) != 0 |
310 |
if (worker_index == workers - 1) { |
if (worker_index == workers - 1) { |
311 |
worker_rows = YSIZE - worker_startrow; |
worker_rows = YSIZE - worker_startrow; |
312 |
printf("rows for last worker: %i\n", worker_rows); |
if (VERBOSE) |
313 |
|
fprintf(stdout, "rows for last worker: %i\n", worker_rows); |
314 |
|
} |
315 |
|
|
316 |
|
// assign each worker's arguments |
317 |
|
worker_args[worker_index].start_row = worker_startrow; |
318 |
|
worker_args[worker_index].number_of_rows = worker_rows; |
319 |
|
worker_args[worker_index].pBitmap = pDataBitmap; |
320 |
|
|
321 |
|
if (!use_processes) { |
322 |
|
|
323 |
|
worker_handles[worker_index] = CreateThread( |
324 |
|
NULL, // LPSECURITY_ATTRIBUTES lpThreadAttributes, |
325 |
|
0, // SIZE_T dwStackSize, |
326 |
|
&fractal_create_segment, // LPTHREAD_START_ROUTINE lpStartAddress, |
327 |
|
&worker_args[worker_index], // LPVOID lpParameter, |
328 |
|
0, // DWORD dwCreationFlags, |
329 |
|
NULL // LPDWORD lpThreadId |
330 |
|
); |
331 |
|
|
332 |
|
if (!worker_handles[worker_index]) |
333 |
|
printErrorAndExit("CreateThread failed", GetLastError()); |
334 |
|
|
335 |
|
} else { |
336 |
|
|
337 |
|
_snprintf(szCmdline, 1023, "%s %s %i %i", argv[0], "--worker", worker_startrow, worker_rows); |
338 |
|
if (VERBOSE) |
339 |
|
fprintf(stdout, "starting worker process: %s\n", szCmdline); |
340 |
|
ZeroMemory( &si, sizeof(si) ); |
341 |
|
si.cb = sizeof(si); |
342 |
|
ZeroMemory( &pi, sizeof(pi) ); |
343 |
|
|
344 |
|
if (!CreateProcess( |
345 |
|
NULL, // No module name (use command line) |
346 |
|
szCmdline, // Command line |
347 |
|
NULL, // Process handle not inheritable |
348 |
|
NULL, // Thread handle not inheritable |
349 |
|
FALSE, // Set handle inheritance to FALSE |
350 |
|
0, // No creation flags |
351 |
|
NULL, // Use parent's environment block |
352 |
|
NULL, // Use parent's starting directory |
353 |
|
&si, // Pointer to STARTUPINFO structure |
354 |
|
&pi // Pointer to PROCESS_INFORMATION structure |
355 |
|
)) |
356 |
|
printErrorAndExit("CreateProcess failed", GetLastError()); |
357 |
|
|
358 |
|
worker_handles[worker_index] = pi.hProcess; |
359 |
|
|
360 |
} |
} |
|
} |
|
361 |
|
|
|
// calculate fractal |
|
|
for (y=YSIZE-1; y>=0; y--) { |
|
|
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]); |
|
|
|
|
|
// debugging |
|
|
//printf("pointer: %p\n", pDataBitmapCurrent); |
|
|
|
|
|
// transfer color values to current pixel |
|
|
pDataBitmapCurrent[0] = bgr[0]; |
|
|
pDataBitmapCurrent[1] = bgr[1]; |
|
|
pDataBitmapCurrent[2] = bgr[2]; |
|
|
|
|
|
// move pointer to next pixel |
|
|
pDataBitmapCurrent += 3; |
|
|
|
|
|
} |
|
|
//no padding required because 1500%4 =0 |
|
362 |
} |
} |
363 |
|
|
364 |
|
// wait for all threads |
365 |
|
if (VERBOSE) |
366 |
|
fprintf(stdout, "waiting for workers to finish...\n"); |
367 |
|
if (WaitForMultipleObjects(workers, worker_handles, TRUE, INFINITE) == WAIT_FAILED) |
368 |
|
perror("WaitForMultipleObjects"); |
369 |
|
|
370 |
|
// debugging: just run single thread |
371 |
|
//if (WaitForSingleObject(worker_handles[0], INFINITE) == WAIT_FAILED) |
372 |
|
// perror("WaitForSingleObject"); |
373 |
|
|
374 |
|
// close all worker handles |
375 |
|
for (worker_index = 0; worker_index < workers; worker_index++) |
376 |
|
CloseHandle(worker_handles[worker_index]); |
377 |
|
|
378 |
/* write the result into the file */ |
/* write the result into the file */ |
379 |
if (!FlushViewOfFile(pData, 0)) { |
if (!FlushViewOfFile(pData, 0)) { |
380 |
err = GetLastError(); |
err = GetLastError(); |
394 |
printErrorAndExit("Error at CloseHandle", err); |
printErrorAndExit("Error at CloseHandle", err); |
395 |
} |
} |
396 |
|
|
397 |
|
free(worker_args); |
398 |
|
free(worker_handles); |
399 |
|
|
400 |
|
return 0; |
401 |
|
|
402 |
} |
} |