96 |
|
|
97 |
// arguments for each thread |
// arguments for each thread |
98 |
typedef struct _WorkerArguments { |
typedef struct _WorkerArguments { |
99 |
unsigned int start_row; |
int start_row; |
100 |
unsigned int number_of_rows; |
int number_of_rows; |
101 |
unsigned char * pBitmap; |
unsigned char * pBitmap; |
102 |
} WORKERARGS, *PWORKERARGS; |
} WORKERARGS, *PWORKERARGS; |
103 |
|
|
107 |
// thread stuff |
// thread stuff |
108 |
int thread_id; |
int thread_id; |
109 |
PWORKERARGS args; |
PWORKERARGS args; |
110 |
|
unsigned char *pDataBitmapSegment; |
111 |
|
|
112 |
// fractal calculation |
// fractal calculation |
113 |
int x, y; |
int x, y; |
118 |
// get worker arguments |
// get worker arguments |
119 |
args = (PWORKERARGS)lpParam; |
args = (PWORKERARGS)lpParam; |
120 |
|
|
121 |
|
printf("----------------------------------------------\n"); |
122 |
printf("thread_id: %i\n", thread_id); |
printf("thread_id: %i\n", thread_id); |
123 |
printf("arg.start_row: %i\n", args->start_row); |
printf("arg.start_row: %i\n", args->start_row); |
124 |
printf("arg.number_of_rows: %i\n", args->number_of_rows); |
printf("arg.number_of_rows: %i\n", args->number_of_rows); |
125 |
|
|
126 |
|
// calculate pointer to beginning of segment |
127 |
|
pDataBitmapSegment = (unsigned char *)((INT_PTR)args->pBitmap + (YSIZE - (args->start_row + args->number_of_rows)) * 3 * XSIZE); |
128 |
|
printf("segment_start: %p\n", pDataBitmapSegment); |
129 |
|
|
130 |
// calculate fractal |
// calculate fractal |
131 |
for (y = (args->start_row + args->number_of_rows) - 1; y >= args->start_row; y--) { |
for (y = (args->start_row + args->number_of_rows) - 1; y >= args->start_row; y--) { |
132 |
|
//printf("calc: thread=%i; y=%i limits: %i,%i p: %p\n", thread_id, y, args->start_row, args->number_of_rows, pDataBitmapSegment); |
133 |
for (x = 0; x < XSIZE; x++) { |
for (x = 0; x < XSIZE; x++) { |
134 |
getColorValuesAt(x * (2.0 / XSIZE) - 1.5, y * (2.0 / YSIZE) - 1.0, &bgr[2], &bgr[1], &bgr[0]); |
getColorValuesAt(x * (2.0 / XSIZE) - 1.5, y * (2.0 / YSIZE) - 1.0, &bgr[2], &bgr[1], &bgr[0]); |
135 |
|
|
137 |
//printf("pointer: %p\n", pDataBitmapCurrent); |
//printf("pointer: %p\n", pDataBitmapCurrent); |
138 |
|
|
139 |
// transfer color values to current pixel |
// transfer color values to current pixel |
140 |
args->pBitmap[0] = bgr[0]; |
pDataBitmapSegment[0] = bgr[0]; |
141 |
args->pBitmap[1] = bgr[1]; |
pDataBitmapSegment[1] = bgr[1]; |
142 |
args->pBitmap[2] = bgr[2]; |
pDataBitmapSegment[2] = bgr[2]; |
143 |
|
|
144 |
// move pointer to next pixel |
// move pointer to next pixel |
145 |
args->pBitmap += 3; |
pDataBitmapSegment += 3; |
146 |
|
|
147 |
} |
} |
148 |
//no padding required because 1500%4 =0 |
//no padding required because 1500%4 =0 |
149 |
} |
} |
150 |
|
|
151 |
|
printf("thread finished: %i\n", thread_id); |
152 |
return 0; |
return 0; |
153 |
|
|
154 |
} |
} |
163 |
unsigned char *pDataBitmap, *pDataBitmapCurrent; |
unsigned char *pDataBitmap, *pDataBitmapCurrent; |
164 |
|
|
165 |
// workers |
// workers |
166 |
unsigned int workers = 3; |
int workers = 10; |
167 |
unsigned int worker_index, worker_rows, worker_startrow; |
int worker_index, worker_rows, worker_startrow; |
168 |
HANDLE *worker_handles; |
HANDLE *worker_handles; |
169 |
//struct WorkerArguments *worker_args; |
//struct WorkerArguments *worker_args; |
170 |
PWORKERARGS worker_args; |
PWORKERARGS worker_args; |
230 |
printf("rows for each worker: %i\n", worker_rows); |
printf("rows for each worker: %i\n", worker_rows); |
231 |
for (worker_index = 0; worker_index < workers; worker_index++) { |
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 |
// number of row to start for each worker |
238 |
worker_startrow = worker_index * worker_rows; |
worker_startrow = worker_index * worker_rows; |
239 |
|
|
261 |
// wait for all threads |
// wait for all threads |
262 |
if (WaitForMultipleObjects(workers, worker_handles, TRUE, INFINITE) == WAIT_FAILED) |
if (WaitForMultipleObjects(workers, worker_handles, TRUE, INFINITE) == WAIT_FAILED) |
263 |
perror("WaitForMultipleObjects"); |
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(); |