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#define YSIZE 500 |
#define YSIZE 500 |
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#include "algorithm.h" |
#include "algorithm.h" |
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#define MASTER -1 |
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BOOL VERBOSE = TRUE; |
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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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} WORKERARGS, *PWORKERARGS; |
} WORKERARGS, *PWORKERARGS; |
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// worker thread - main entry function |
// worker thread - main entry function |
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DWORD WINAPI fractal_thread (LPVOID lpParam) { |
DWORD WINAPI fractal_create_segment (LPVOID lpParam) { |
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// thread stuff |
// thread stuff |
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int thread_id; |
int thread_id; |
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// get worker arguments |
// get worker arguments |
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args = (PWORKERARGS)lpParam; |
args = (PWORKERARGS)lpParam; |
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printf("----------------------------------------------\n"); |
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printf("thread_id: %i\n", thread_id); |
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printf("arg.start_row: %i\n", args->start_row); |
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printf("arg.number_of_rows: %i\n", args->number_of_rows); |
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// calculate pointer to beginning of segment |
// 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); |
pDataBitmapSegment = (unsigned char *)((INT_PTR)args->pBitmap + (YSIZE - (args->start_row + args->number_of_rows)) * 3 * XSIZE); |
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printf("segment_start: %p\n", pDataBitmapSegment); |
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// debugging |
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if (VERBOSE) { |
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printf("----------------------------------------------\n"); |
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printf("thread_id: %i\n", thread_id); |
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printf("arg.start_row: %i\n", args->start_row); |
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printf("arg.number_of_rows: %i\n", args->number_of_rows); |
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printf("segment_start: %p\n", pDataBitmapSegment); |
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} |
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// calculate fractal |
// calculate fractal |
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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--) { |
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for (x = 0; x < XSIZE; x++) { |
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]); |
getColorValuesAt(x * (2.0 / XSIZE) - 1.5, y * (2.0 / YSIZE) - 1.0, &bgr[2], &bgr[1], &bgr[0]); |
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// debugging |
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//printf("pointer: %p\n", pDataBitmapCurrent); |
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// transfer color values to current pixel |
// transfer color values to current pixel |
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pDataBitmapSegment[0] = bgr[0]; |
pDataBitmapSegment[0] = bgr[0]; |
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pDataBitmapSegment[1] = bgr[1]; |
pDataBitmapSegment[1] = bgr[1]; |
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pDataBitmapSegment += 3; |
pDataBitmapSegment += 3; |
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} |
} |
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//no padding required because 1500%4 =0 |
//no padding required because 1500%4 =0 ??? |
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} |
} |
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printf("thread finished: %i\n", thread_id); |
if (VERBOSE) |
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printf("thread finished: %i\n", thread_id); |
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return 0; |
return 0; |
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} |
} |
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DWORD err; |
DWORD err; |
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HANDLE hMap, hFile; |
HANDLE hMap, hFile; |
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LPVOID pData; |
LPVOID pData; |
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unsigned char *pDataBitmap, *pDataBitmapCurrent; |
unsigned char *pDataBitmap; |
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// workers |
// workers |
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int workers = 10; |
int workers = 5; |
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int worker_index, worker_rows, worker_startrow; |
int worker_index, worker_rows, worker_startrow; |
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HANDLE *worker_handles; |
HANDLE *worker_handles; |
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//struct WorkerArguments *worker_args; |
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PWORKERARGS worker_args; |
PWORKERARGS worker_args; |
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// threads or processes? |
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BOOL use_processes = TRUE; |
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int worker_id = MASTER; |
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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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// "parse" command line arguments |
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if (argc >= 2) { |
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worker_id = atoi(argv[1]); |
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} |
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if (VERBOSE) { |
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printf("==============================================================\n"); |
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printf("worker-id: %i\n", worker_id); |
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} |
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// create empty bmp-file (black background) |
// create empty bmp-file (black background) |
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write_blank_file("test.bmp"); |
if (worker_id == MASTER) |
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write_blank_file("test.bmp"); |
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/* open file for reading and writing */ |
if (worker_id == MASTER) { |
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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) { |
/* open file for reading and writing */ |
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err = GetLastError(); |
hFile = CreateFile("test.bmp", GENERIC_WRITE|GENERIC_READ, 0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL); |
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printErrorAndExit("Error at CreateFile",err); |
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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} 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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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); |
printf("pos. of file: %p\n", pData); |
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printf("pos. of bitmap: %p\n", pDataBitmap); |
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} |
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// pointer to current pixel |
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pDataBitmapCurrent = pDataBitmap; |
if (use_processes && worker_id != MASTER) { |
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if (VERBOSE) |
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printf("inside worker-process\n"); |
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worker_index = worker_id; |
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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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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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// allocate memory for bitmap |
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/* |
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if ((pDataBitmap = malloc(XSIZE * YSIZE * 3 * sizeof(pDataBitmap[0]))) == NULL) |
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perror("malloc"), exit(1); |
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*/ |
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// allocate memory for table of all worker handles |
// allocate memory for table of all worker handles |
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if ((worker_handles = malloc(workers * sizeof worker_handles[0])) == NULL) |
if ((worker_handles = malloc(workers * sizeof(worker_handles[0]))) == NULL) |
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perror("malloc"), exit(1); |
perror("malloc"), exit(1); |
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/* |
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// allocate memory for table of all worker arguments |
// allocate memory for table of all worker arguments |
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if ((worker_args = malloc(workers * sizeof worker_args[0])) == NULL) |
if ((worker_args = malloc(workers * sizeof(worker_args[0]))) == NULL) |
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perror("malloc"), exit(1); |
perror("malloc"), exit(1); |
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*/ |
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// allocate memory for table of all worker arguments |
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worker_args = (PWORKERARGS) HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, workers * sizeof(WORKERARGS)); |
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// calculate segments of bitmap for worker threads/processes and start them |
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// calculate bitmap segment length for workers |
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worker_rows = YSIZE / workers; |
worker_rows = YSIZE / workers; |
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printf("rows for each worker: %i\n", worker_rows); |
if (VERBOSE) |
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printf("rows for each worker: %i\n", worker_rows); |
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// start workers |
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for (worker_index = 0; worker_index < workers; worker_index++) { |
for (worker_index = 0; worker_index < workers; worker_index++) { |
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// debugging: just run with single thread |
// debugging: just run single thread |
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//if (worker_index == 1) |
//if (worker_index == 1) |
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// continue; |
// continue; |
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// recalculate number of rows for last worker if (YSIZE mod workers) != 0 |
// recalculate number of rows for last worker if (YSIZE mod workers) != 0 |
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if (worker_index == workers - 1) { |
if (worker_index == workers - 1) { |
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worker_rows = YSIZE - worker_startrow; |
worker_rows = YSIZE - worker_startrow; |
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printf("rows for last worker: %i\n", worker_rows); |
if (VERBOSE) |
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printf("rows for last worker: %i\n", worker_rows); |
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} |
} |
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// assign each worker's arguments |
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worker_args[worker_index].start_row = worker_startrow; |
worker_args[worker_index].start_row = worker_startrow; |
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worker_args[worker_index].number_of_rows = worker_rows; |
worker_args[worker_index].number_of_rows = worker_rows; |
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worker_args[worker_index].pBitmap = pDataBitmap; |
worker_args[worker_index].pBitmap = pDataBitmap; |
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worker_handles[worker_index] = CreateThread( |
if (!use_processes) { |
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NULL, // LPSECURITY_ATTRIBUTES lpThreadAttributes, |
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0, // SIZE_T dwStackSize, |
worker_handles[worker_index] = CreateThread( |
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fractal_thread, // LPTHREAD_START_ROUTINE lpStartAddress, |
NULL, // LPSECURITY_ATTRIBUTES lpThreadAttributes, |
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&worker_args[worker_index], // LPVOID lpParameter, |
0, // SIZE_T dwStackSize, |
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0, // DWORD dwCreationFlags, |
&fractal_create_segment, // LPTHREAD_START_ROUTINE lpStartAddress, |
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NULL // LPDWORD lpThreadId |
&worker_args[worker_index], // LPVOID lpParameter, |
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); |
0, // DWORD dwCreationFlags, |
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NULL // LPDWORD lpThreadId |
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); |
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if (!worker_handles[worker_index]) |
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printErrorAndExit("CreateThread failed", GetLastError()); |
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} else { |
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_snprintf(szCmdline, 1023, "%s %i %i %i", argv[0], worker_index + 1, worker_startrow, worker_rows); |
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ZeroMemory( &si, sizeof(si) ); |
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si.cb = sizeof(si); |
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ZeroMemory( &pi, sizeof(pi) ); |
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if (!CreateProcess( |
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NULL, // No module name (use command line) |
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szCmdline, // Command line |
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NULL, // Process handle not inheritable |
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NULL, // Thread handle not inheritable |
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FALSE, // Set handle inheritance to FALSE |
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0, // No creation flags |
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NULL, // Use parent's environment block |
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NULL, // Use parent's starting directory |
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&si, // Pointer to STARTUPINFO structure |
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&pi // Pointer to PROCESS_INFORMATION structure |
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)) |
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printErrorAndExit("CreateProcess failed", GetLastError()); |
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worker_handles[worker_index] = pi.hProcess; |
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} |
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} |
} |
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// wait for all threads |
// wait for all threads |
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if (VERBOSE) |
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printf("waiting for workers to finish...\n"); |
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if (WaitForMultipleObjects(workers, worker_handles, TRUE, INFINITE) == WAIT_FAILED) |
if (WaitForMultipleObjects(workers, worker_handles, TRUE, INFINITE) == WAIT_FAILED) |
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perror("WaitForMultipleObjects"); |
perror("WaitForMultipleObjects"); |
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// debugging: just run with single thread |
// debugging: just run single thread |
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//if (WaitForSingleObject(worker_handles[0], INFINITE) == WAIT_FAILED) |
//if (WaitForSingleObject(worker_handles[0], INFINITE) == WAIT_FAILED) |
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// perror("WaitForSingleObject"); |
// perror("WaitForSingleObject"); |
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printErrorAndExit("Error at CloseHandle", err); |
printErrorAndExit("Error at CloseHandle", err); |
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} |
} |
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free(worker_args); |
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free(worker_handles); |
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return 0; |
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} |
} |