94 |
} |
} |
95 |
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|
96 |
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|
97 |
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// arguments for each thread |
98 |
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typedef struct _WorkerArguments { |
99 |
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int start_row; |
100 |
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int number_of_rows; |
101 |
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unsigned char * pBitmap; |
102 |
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} WORKERARGS, *PWORKERARGS; |
103 |
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|
104 |
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// worker thread - main entry function |
105 |
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DWORD WINAPI fractal_thread (LPVOID lpParam) { |
106 |
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|
107 |
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// thread stuff |
108 |
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int thread_id; |
109 |
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PWORKERARGS args; |
110 |
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unsigned char *pDataBitmapSegment; |
111 |
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|
112 |
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// fractal calculation |
113 |
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int x, y; |
114 |
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char bgr[3]; |
115 |
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|
116 |
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thread_id = GetCurrentThreadId(); |
117 |
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|
118 |
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// get worker arguments |
119 |
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args = (PWORKERARGS)lpParam; |
120 |
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|
121 |
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printf("----------------------------------------------\n"); |
122 |
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printf("thread_id: %i\n", thread_id); |
123 |
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printf("arg.start_row: %i\n", args->start_row); |
124 |
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printf("arg.number_of_rows: %i\n", args->number_of_rows); |
125 |
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|
126 |
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// calculate pointer to beginning of segment |
127 |
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pDataBitmapSegment = (unsigned char *)((INT_PTR)args->pBitmap + (YSIZE - (args->start_row + args->number_of_rows)) * 3 * XSIZE); |
128 |
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printf("segment_start: %p\n", pDataBitmapSegment); |
129 |
|
|
130 |
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// calculate fractal |
131 |
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for (y = (args->start_row + args->number_of_rows) - 1; y >= args->start_row; y--) { |
132 |
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//printf("calc: thread=%i; y=%i limits: %i,%i p: %p\n", thread_id, y, args->start_row, args->number_of_rows, pDataBitmapSegment); |
133 |
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for (x = 0; x < XSIZE; x++) { |
134 |
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getColorValuesAt(x * (2.0 / XSIZE) - 1.5, y * (2.0 / YSIZE) - 1.0, &bgr[2], &bgr[1], &bgr[0]); |
135 |
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|
136 |
|
// debugging |
137 |
|
//printf("pointer: %p\n", pDataBitmapCurrent); |
138 |
|
|
139 |
|
// transfer color values to current pixel |
140 |
|
pDataBitmapSegment[0] = bgr[0]; |
141 |
|
pDataBitmapSegment[1] = bgr[1]; |
142 |
|
pDataBitmapSegment[2] = bgr[2]; |
143 |
|
|
144 |
|
// move pointer to next pixel |
145 |
|
pDataBitmapSegment += 3; |
146 |
|
|
147 |
|
} |
148 |
|
//no padding required because 1500%4 =0 |
149 |
|
} |
150 |
|
|
151 |
|
printf("thread finished: %i\n", thread_id); |
152 |
|
return 0; |
153 |
|
|
154 |
|
} |
155 |
|
|
156 |
|
|
157 |
int main(int argc, char *argv[]) { |
int main(int argc, char *argv[]) { |
158 |
|
|
159 |
// MMF support |
// MMF support |
162 |
LPVOID pData; |
LPVOID pData; |
163 |
unsigned char *pDataBitmap, *pDataBitmapCurrent; |
unsigned char *pDataBitmap, *pDataBitmapCurrent; |
164 |
|
|
165 |
// fractal calculation |
// workers |
166 |
int x, y; |
int workers = 10; |
167 |
char bgr[3]; |
int worker_index, worker_rows, worker_startrow; |
168 |
|
HANDLE *worker_handles; |
169 |
|
//struct WorkerArguments *worker_args; |
170 |
|
PWORKERARGS worker_args; |
171 |
|
|
172 |
|
|
173 |
// create empty bmp-file (black background) |
// create empty bmp-file (black background) |
174 |
write_blank_file("test.bmp"); |
write_blank_file("test.bmp"); |
212 |
} |
} |
213 |
*/ |
*/ |
214 |
|
|
|
// 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 |
|
|
} |
|
215 |
|
|
216 |
|
// allocate memory for table of all worker handles |
217 |
|
if ((worker_handles = malloc(workers * sizeof worker_handles[0])) == NULL) |
218 |
|
perror("malloc"), exit(1); |
219 |
|
|
220 |
|
/* |
221 |
|
// allocate memory for table of all worker arguments |
222 |
|
if ((worker_args = malloc(workers * sizeof worker_args[0])) == NULL) |
223 |
|
perror("malloc"), exit(1); |
224 |
|
*/ |
225 |
|
// allocate memory for table of all worker arguments |
226 |
|
worker_args = (PWORKERARGS) HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, workers * sizeof(WORKERARGS)); |
227 |
|
|
228 |
|
// calculate segments of bitmap for worker threads/processes and start them |
229 |
|
worker_rows = YSIZE / workers; |
230 |
|
printf("rows for each worker: %i\n", worker_rows); |
231 |
|
for (worker_index = 0; worker_index < workers; worker_index++) { |
232 |
|
|
233 |
|
// debugging: just run with single thread |
234 |
|
//if (worker_index == 1) |
235 |
|
// continue; |
236 |
|
|
237 |
|
// number of row to start for each worker |
238 |
|
worker_startrow = worker_index * worker_rows; |
239 |
|
|
240 |
|
// recalculate number of rows for last worker if (YSIZE mod workers) != 0 |
241 |
|
if (worker_index == workers - 1) { |
242 |
|
worker_rows = YSIZE - worker_startrow; |
243 |
|
printf("rows for last worker: %i\n", worker_rows); |
244 |
|
} |
245 |
|
|
246 |
|
worker_args[worker_index].start_row = worker_startrow; |
247 |
|
worker_args[worker_index].number_of_rows = worker_rows; |
248 |
|
worker_args[worker_index].pBitmap = pDataBitmap; |
249 |
|
|
250 |
|
worker_handles[worker_index] = CreateThread( |
251 |
|
NULL, // LPSECURITY_ATTRIBUTES lpThreadAttributes, |
252 |
|
0, // SIZE_T dwStackSize, |
253 |
|
fractal_thread, // LPTHREAD_START_ROUTINE lpStartAddress, |
254 |
|
&worker_args[worker_index], // LPVOID lpParameter, |
255 |
|
0, // DWORD dwCreationFlags, |
256 |
|
NULL // LPDWORD lpThreadId |
257 |
|
); |
258 |
|
|
259 |
|
} |
260 |
|
|
261 |
|
// wait for all threads |
262 |
|
if (WaitForMultipleObjects(workers, worker_handles, TRUE, INFINITE) == WAIT_FAILED) |
263 |
|
perror("WaitForMultipleObjects"); |
264 |
|
|
265 |
|
// debugging: just run with single thread |
266 |
|
//if (WaitForSingleObject(worker_handles[0], INFINITE) == WAIT_FAILED) |
267 |
|
// perror("WaitForSingleObject"); |
268 |
|
|
269 |
|
// close all worker handles |
270 |
|
for (worker_index = 0; worker_index < workers; worker_index++) |
271 |
|
CloseHandle(worker_handles[worker_index]); |
272 |
|
|
273 |
/* write the result into the file */ |
/* write the result into the file */ |
274 |
if (!FlushViewOfFile(pData, 0)) { |
if (!FlushViewOfFile(pData, 0)) { |
275 |
err = GetLastError(); |
err = GetLastError(); |