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#define YSIZE 500 |
#define YSIZE 500 |
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#include "algorithm.h" |
#include "algorithm.h" |
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BOOL VERBOSE = FALSE; |
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/* BMP Header */ |
/* BMP Header */ |
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unsigned char header[54]={0x42,0x4d, // signature BM |
unsigned char header[54]={0x42,0x4d, // signature BM |
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0, |
0, |
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NULL )) |
NULL )) |
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{ |
{ |
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fprintf(stderr,"%s : %s\n",msg,lpMsgBuf); |
fprintf(stdout, "%s: %s\n", msg, lpMsgBuf); |
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LocalFree(lpMsgBuf); |
LocalFree(lpMsgBuf); |
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} |
} |
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else |
else |
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{ |
{ |
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fprintf(stderr,"Error at FormatMesage: %d\n",err=GetLastError()); |
fprintf(stdout, "Error at FormatMesage: %d\n",err=GetLastError()); |
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} |
} |
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exit(err); |
exit(err); |
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} |
} |
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} |
} |
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int main(int argc, char *argv[]) { |
// arguments for each thread |
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int len,x,y; |
typedef struct _WorkerArguments { |
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int start_row; |
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int number_of_rows; |
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unsigned char * pBitmap; |
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} WORKERARGS, *PWORKERARGS; |
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// worker thread - main entry function |
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DWORD WINAPI fractal_create_segment (LPVOID lpParam) { |
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// thread stuff |
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int thread_id; |
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PWORKERARGS args; |
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unsigned char *pDataBitmapSegment; |
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// fractal calculation |
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int x, y; |
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char bgr[3]; |
char bgr[3]; |
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short svalue; |
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int lvalue; |
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HANDLE hMap, hFile; |
thread_id = GetCurrentThreadId(); |
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DWORD err, size; |
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int elems; |
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LPVOID pData; |
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unsigned char *pDataBitmap, *pDataBitmapCurrent; |
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int offset; |
// get worker arguments |
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args = (PWORKERARGS)lpParam; |
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// create empty file (black background) |
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write_blank_file("test.bmp"); |
// calculate pointer to beginning of segment |
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pDataBitmapSegment = (unsigned char *)((INT_PTR)args->pBitmap + (YSIZE - (args->start_row + args->number_of_rows)) * 3 * XSIZE); |
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// debugging |
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if (VERBOSE) { |
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fprintf(stdout, "----------------------------------------------\n"); |
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fprintf(stdout, "thread_id: %i\n", thread_id); |
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fprintf(stdout, "arg.start_row: %i\n", args->start_row); |
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fprintf(stdout, "arg.number_of_rows: %i\n", args->number_of_rows); |
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fprintf(stdout, "segment_start: %p\n", pDataBitmapSegment); |
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} |
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// calculate fractal |
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for (y = (args->start_row + args->number_of_rows) - 1; y >= args->start_row; y--) { |
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//fprintf(stdout, "calc: thread=%i; y=%i limits: %i,%i p: %p\n", thread_id, y, args->start_row, args->number_of_rows, pDataBitmapSegment); |
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for (x = 0; x < XSIZE; x++) { |
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getColorValuesAt(x * (2.0 / XSIZE) - 1.5, y * (2.0 / YSIZE) - 1.0, &bgr[2], &bgr[1], &bgr[0]); |
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// transfer color values to current pixel |
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pDataBitmapSegment[0] = bgr[0]; |
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pDataBitmapSegment[1] = bgr[1]; |
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pDataBitmapSegment[2] = bgr[2]; |
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// move pointer to next pixel |
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pDataBitmapSegment += 3; |
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} |
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//no padding required because 1500%4 =0 ??? |
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} |
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/* open file for reading and writing */ |
if (VERBOSE) |
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hFile = CreateFile("test.bmp", GENERIC_WRITE|GENERIC_READ, 0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL); |
fprintf(stdout, "thread finished: %i\n", thread_id); |
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if (INVALID_HANDLE_VALUE == hFile) { |
return 0; |
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err = GetLastError(); |
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printErrorAndExit("Error at CreateFile",err); |
} |
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int main(int argc, char *argv[]) { |
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// MMF support |
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DWORD err; |
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HANDLE hMap, hFile; |
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LPVOID pData; |
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unsigned char *pDataBitmap; |
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// workers |
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int workers = 5; |
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int worker_index, worker_rows, worker_startrow; |
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HANDLE *worker_handles; |
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PWORKERARGS worker_args; |
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// threads or processes? |
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BOOL use_processes = TRUE; |
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BOOL is_worker_process = FALSE; |
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// information for creating processes |
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STARTUPINFO si; |
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PROCESS_INFORMATION pi; |
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char szCmdline[1024]; |
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VERBOSE = TRUE; |
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// "parse" command line arguments |
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if (argc >= 2) { |
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if (strcmp(argv[1], "--worker") == 0) { |
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is_worker_process = TRUE; |
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} |
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} |
} |
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if (VERBOSE && use_processes) { |
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fprintf(stdout, "===================================================== "); |
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if (is_worker_process) |
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fprintf(stdout, "WORKER-PROCESS\n"); |
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else |
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fprintf(stdout, "MASTER-PROCESS\n"); |
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} |
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// create empty bmp-file (black background) |
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if (!is_worker_process) |
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write_blank_file("test.bmp"); |
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// master creates memory mapped file |
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if (!is_worker_process) { |
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// open file for reading and writing |
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hFile = CreateFile("test.bmp", GENERIC_WRITE|GENERIC_READ, 0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL); |
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if (INVALID_HANDLE_VALUE == hFile) { |
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err = GetLastError(); |
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printErrorAndExit("Error at CreateFile",err); |
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} |
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/* create the file mapping object */ |
// create the file mapping object |
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hMap = CreateFileMapping(hFile, NULL, PAGE_READWRITE, 0, 0, NULL); |
hMap = CreateFileMapping(hFile, NULL, PAGE_READWRITE, 0, 0, "bmp_fractal"); |
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if (NULL == hMap) { |
if (NULL == hMap) { |
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printErrorAndExit("Error at CreateFileMapping", GetLastError()); |
printErrorAndExit("Error at CreateFileMapping", GetLastError()); |
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} |
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// worker uses existing memory mapped file |
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} else { |
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// open existing mapping object |
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hMap = OpenFileMapping(FILE_MAP_WRITE, FALSE, "bmp_fractal"); |
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if (NULL == hMap) |
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printErrorAndExit("Error at OpenFileMapping", GetLastError()); |
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} |
} |
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/* map the whole file into the process context */ |
// map the whole file into the process context |
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pData = MapViewOfFile(hMap, FILE_MAP_WRITE, 0, 0, 0); |
pData = MapViewOfFile(hMap, FILE_MAP_WRITE, 0, 0, 0); |
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if (NULL == pData) { |
if (NULL == pData) { |
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printErrorAndExit("Error at MapViewOfFile", GetLastError()); |
printErrorAndExit("Error at MapViewOfFile", GetLastError()); |
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pDataBitmap = (unsigned char *)((INT_PTR)pData + sizeof(header)); |
pDataBitmap = (unsigned char *)((INT_PTR)pData + sizeof(header)); |
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// debugging |
// debugging |
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printf("pos. of file: %p\n", pData); |
if (VERBOSE) { |
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printf("pos. of bitmap: %p\n", pDataBitmap); |
fprintf(stdout, "pos. of file: %p\n", pData); |
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fprintf(stdout, "pos. of bitmap: %p\n", pDataBitmap); |
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// pointer to current pixel |
} |
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pDataBitmapCurrent = pDataBitmap; |
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if (use_processes && is_worker_process) { |
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if (VERBOSE) |
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fprintf(stdout, "inside worker-process\n"); |
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// get segment information from command line |
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worker_startrow = atoi(argv[2]); |
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worker_rows = atoi(argv[3]); |
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// allocate memory for one worker's arguments |
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if ((worker_args = malloc(sizeof(worker_args[0]))) == NULL) |
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perror("malloc"), exit(1); |
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// assign worker's arguments |
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worker_args[0].start_row = worker_startrow; |
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worker_args[0].number_of_rows = worker_rows; |
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worker_args[0].pBitmap = pDataBitmap; |
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fractal_create_segment(&worker_args[0]); |
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// cleanup mmap-handle |
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if (!CloseHandle(hMap)) |
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printErrorAndExit("Error at CloseHandle", GetLastError()); |
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return 0; |
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} |
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/* |
/* |
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// turn bitmap into white wand |
// turn bitmap into white canvas |
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for (offset = 0; offset < 500 * 500 * 3; offset++) { |
for (offset = 0; offset < 500 * 500 * 3; offset++) { |
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//pDataBitmap[offset] = 255; |
*pDataBitmap = 255; |
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*pDataBitmapCurrent = 255; |
pDataBitmap++; |
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pDataBitmapCurrent++; |
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} |
} |
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exit(0); |
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*/ |
*/ |
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// calculate fractal |
// allocate memory for bitmap |
284 |
for (y=YSIZE-1; y>=0; y--) { |
/* |
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for (x=0; x<XSIZE; x++) { |
if ((pDataBitmap = malloc(XSIZE * YSIZE * 3 * sizeof(pDataBitmap[0]))) == NULL) |
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getColorValuesAt(x * (2.0 / XSIZE) - 1.5, y * (2.0 / YSIZE) - 1.0, &bgr[2], &bgr[1], &bgr[0]); |
perror("malloc"), exit(1); |
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*/ |
288 |
// debugging |
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289 |
//printf("pointer: %p\n", pDataBitmapCurrent); |
// allocate memory for table of all worker handles |
290 |
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if ((worker_handles = malloc(workers * sizeof(worker_handles[0]))) == NULL) |
291 |
// transfer color values to current pixel |
perror("malloc"), exit(1); |
292 |
//*pDataBitmapCurrent = (unsigned char *)bgr; |
|
293 |
pDataBitmapCurrent[0] = bgr[0]; |
// allocate memory for table of all worker arguments |
294 |
pDataBitmapCurrent[1] = bgr[1]; |
if ((worker_args = malloc(workers * sizeof(worker_args[0]))) == NULL) |
295 |
pDataBitmapCurrent[2] = bgr[2]; |
perror("malloc"), exit(1); |
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297 |
// move pointer to next pixel |
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298 |
pDataBitmapCurrent += 3; |
// calculate bitmap segment length for workers |
299 |
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worker_rows = YSIZE / workers; |
300 |
} |
if (VERBOSE) |
301 |
//no padding required because 1500%4 =0 |
fprintf(stdout, "rows for each worker: %i\n", worker_rows); |
302 |
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// start workers |
304 |
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for (worker_index = 0; worker_index < workers; worker_index++) { |
305 |
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306 |
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// debugging: just run single thread |
307 |
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//if (worker_index == 1) |
308 |
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// continue; |
309 |
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310 |
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// number of row to start for each worker |
311 |
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worker_startrow = worker_index * worker_rows; |
312 |
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313 |
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// recalculate number of rows for last worker if (YSIZE mod workers) != 0 |
314 |
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if (worker_index == workers - 1) { |
315 |
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worker_rows = YSIZE - worker_startrow; |
316 |
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if (VERBOSE) |
317 |
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fprintf(stdout, "rows for last worker: %i\n", worker_rows); |
318 |
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} |
319 |
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320 |
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// assign each worker's arguments |
321 |
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worker_args[worker_index].start_row = worker_startrow; |
322 |
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worker_args[worker_index].number_of_rows = worker_rows; |
323 |
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worker_args[worker_index].pBitmap = pDataBitmap; |
324 |
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325 |
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if (!use_processes) { |
326 |
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327 |
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worker_handles[worker_index] = CreateThread( |
328 |
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NULL, // LPSECURITY_ATTRIBUTES lpThreadAttributes, |
329 |
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0, // SIZE_T dwStackSize, |
330 |
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&fractal_create_segment, // LPTHREAD_START_ROUTINE lpStartAddress, |
331 |
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&worker_args[worker_index], // LPVOID lpParameter, |
332 |
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0, // DWORD dwCreationFlags, |
333 |
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NULL // LPDWORD lpThreadId |
334 |
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); |
335 |
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336 |
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if (!worker_handles[worker_index]) |
337 |
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printErrorAndExit("CreateThread failed", GetLastError()); |
338 |
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339 |
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} else { |
340 |
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341 |
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_snprintf(szCmdline, 1023, "%s %s %i %i", argv[0], "--worker", worker_startrow, worker_rows); |
342 |
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if (VERBOSE) |
343 |
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fprintf(stdout, "starting worker process: %s\n", szCmdline); |
344 |
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ZeroMemory( &si, sizeof(si) ); |
345 |
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si.cb = sizeof(si); |
346 |
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ZeroMemory( &pi, sizeof(pi) ); |
347 |
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348 |
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if (!CreateProcess( |
349 |
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NULL, // No module name (use command line) |
350 |
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szCmdline, // Command line |
351 |
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NULL, // Process handle not inheritable |
352 |
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NULL, // Thread handle not inheritable |
353 |
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FALSE, // Set handle inheritance to FALSE |
354 |
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0, // No creation flags |
355 |
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NULL, // Use parent's environment block |
356 |
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NULL, // Use parent's starting directory |
357 |
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&si, // Pointer to STARTUPINFO structure |
358 |
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&pi // Pointer to PROCESS_INFORMATION structure |
359 |
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)) |
360 |
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printErrorAndExit("CreateProcess failed", GetLastError()); |
361 |
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362 |
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worker_handles[worker_index] = pi.hProcess; |
363 |
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364 |
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} |
365 |
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366 |
} |
} |
367 |
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368 |
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// wait for all threads |
369 |
/* write the result into the file */ |
if (VERBOSE) |
370 |
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fprintf(stdout, "waiting for workers to finish...\n"); |
371 |
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if (WaitForMultipleObjects(workers, worker_handles, TRUE, INFINITE) == WAIT_FAILED) |
372 |
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perror("WaitForMultipleObjects"); |
373 |
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374 |
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// debugging: just run single thread |
375 |
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//if (WaitForSingleObject(worker_handles[0], INFINITE) == WAIT_FAILED) |
376 |
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// perror("WaitForSingleObject"); |
377 |
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378 |
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// close all worker handles |
379 |
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for (worker_index = 0; worker_index < workers; worker_index++) |
380 |
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CloseHandle(worker_handles[worker_index]); |
381 |
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382 |
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// write the result into the file |
383 |
if (!FlushViewOfFile(pData, 0)) { |
if (!FlushViewOfFile(pData, 0)) { |
384 |
err = GetLastError(); |
err = GetLastError(); |
385 |
printErrorAndExit("Error at UnmapViewOfFile", err); |
printErrorAndExit("Error at UnmapViewOfFile", err); |
386 |
} |
} |
387 |
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388 |
/* remove the mapped file */ |
// remove the mapped file |
389 |
if (!UnmapViewOfFile(pData)) { |
if (!UnmapViewOfFile(pData)) { |
390 |
err = GetLastError(); |
err = GetLastError(); |
391 |
printErrorAndExit("Error at UnmapViewOfFile", err); |
printErrorAndExit("Error at UnmapViewOfFile", err); |
392 |
exit(err); |
exit(err); |
393 |
} |
} |
394 |
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395 |
/* cleanup handles */ |
// cleanup handles |
396 |
if (!CloseHandle(hMap) || !CloseHandle(hFile) ) { |
if (!CloseHandle(hMap) || !CloseHandle(hFile) ) { |
397 |
err = GetLastError(); |
err = GetLastError(); |
398 |
printErrorAndExit("Error at CloseHandle", err); |
printErrorAndExit("Error at CloseHandle", err); |
399 |
} |
} |
400 |
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401 |
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free(worker_args); |
402 |
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free(worker_handles); |
403 |
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404 |
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return 0; |
405 |
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406 |
} |
} |