--- joko/Uni/BSArch/04/bmp_fractal.c 2006/07/01 12:19:46 1.5 +++ joko/Uni/BSArch/04/bmp_fractal.c 2006/07/02 09:27:14 1.12 @@ -5,7 +5,7 @@ * Uebung 4.4 */ -// $Id: bmp_fractal.c,v 1.5 2006/07/01 12:19:46 joko Exp $ +// $Id: bmp_fractal.c,v 1.12 2006/07/02 09:27:14 joko Exp $ #include #include @@ -15,6 +15,8 @@ #define YSIZE 500 #include "algorithm.h" +BOOL VERBOSE = FALSE; + /* BMP Header */ unsigned char header[54]={0x42,0x4d, // signature BM @@ -47,12 +49,12 @@ 0, NULL )) { - fprintf(stderr,"%s : %s\n",msg,lpMsgBuf); + fprintf(stdout, "%s: %s\n", msg, lpMsgBuf); LocalFree(lpMsgBuf); } else { - fprintf(stderr,"Error at FormatMesage: %d\n",err=GetLastError()); + fprintf(stdout, "Error at FormatMesage: %d\n",err=GetLastError()); } exit(err); } @@ -94,40 +96,138 @@ } +// arguments for each thread +typedef struct _WorkerArguments { + int start_row; + int number_of_rows; + unsigned char * pBitmap; +} WORKERARGS, *PWORKERARGS; + +// worker thread - main entry function +DWORD WINAPI fractal_create_segment (LPVOID lpParam) { + + // thread stuff + int thread_id; + PWORKERARGS args; + unsigned char *pDataBitmapSegment; + + // fractal calculation + int x, y; + char bgr[3]; + + thread_id = GetCurrentThreadId(); + + // get worker arguments + args = (PWORKERARGS)lpParam; + + // calculate pointer to beginning of segment + pDataBitmapSegment = (unsigned char *)((INT_PTR)args->pBitmap + (YSIZE - (args->start_row + args->number_of_rows)) * 3 * XSIZE); + + // debugging + if (VERBOSE) { + fprintf(stdout, "----------------------------------------------\n"); + fprintf(stdout, "thread_id: %i\n", thread_id); + fprintf(stdout, "arg.start_row: %i\n", args->start_row); + fprintf(stdout, "arg.number_of_rows: %i\n", args->number_of_rows); + fprintf(stdout, "segment_start: %p\n", pDataBitmapSegment); + } + + // calculate fractal + for (y = (args->start_row + args->number_of_rows) - 1; y >= args->start_row; y--) { + //fprintf(stdout, "calc: thread=%i; y=%i limits: %i,%i p: %p\n", thread_id, y, args->start_row, args->number_of_rows, pDataBitmapSegment); + 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]); + + // transfer color values to current pixel + pDataBitmapSegment[0] = bgr[0]; + pDataBitmapSegment[1] = bgr[1]; + pDataBitmapSegment[2] = bgr[2]; + + // move pointer to next pixel + pDataBitmapSegment += 3; + + } + //no padding required because 1500%4 =0 ??? + } + + if (VERBOSE) + fprintf(stdout, "thread finished: %i\n", thread_id); + return 0; + +} + + int main(int argc, char *argv[]) { // MMF support DWORD err; HANDLE hMap, hFile; LPVOID pData; - unsigned char *pDataBitmap, *pDataBitmapCurrent; + unsigned char *pDataBitmap; // workers - unsigned int workers = 3; - unsigned int worker_index, worker_rows, worker_startrow; - - // fractal calculation - int x, y; - char bgr[3]; + int workers = 5; + int worker_index, worker_rows, worker_startrow; + HANDLE *worker_handles; + PWORKERARGS worker_args; + + // threads or processes? + BOOL use_processes = TRUE; + BOOL is_worker_process = FALSE; + + // information for creating processes + STARTUPINFO si; + PROCESS_INFORMATION pi; + char szCmdline[1024]; + + + VERBOSE = TRUE; + + // "parse" command line arguments + if (argc >= 2) { + if (strcmp(argv[1], "--worker") == 0) { + is_worker_process = TRUE; + } + } + if (VERBOSE && use_processes) { + fprintf(stdout, "===================================================== "); + if (is_worker_process) + fprintf(stdout, "WORKER-PROCESS\n"); + else + fprintf(stdout, "MASTER-PROCESS\n"); + } // create empty bmp-file (black background) - write_blank_file("test.bmp"); + if (!is_worker_process) + write_blank_file("test.bmp"); - /* open file for reading and writing */ - hFile = CreateFile("test.bmp", GENERIC_WRITE|GENERIC_READ, 0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL); - if (INVALID_HANDLE_VALUE == hFile) { - err = GetLastError(); - printErrorAndExit("Error at CreateFile",err); - } + // master creates memory mapped file + if (!is_worker_process) { + + // open file for reading and writing + hFile = CreateFile("test.bmp", GENERIC_WRITE|GENERIC_READ, 0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL); + if (INVALID_HANDLE_VALUE == hFile) { + err = GetLastError(); + printErrorAndExit("Error at CreateFile",err); + } - /* create the file mapping object */ - hMap = CreateFileMapping(hFile, NULL, PAGE_READWRITE, 0, 0, NULL); - if (NULL == hMap) { - printErrorAndExit("Error at CreateFileMapping", GetLastError()); + // create the file mapping object + hMap = CreateFileMapping(hFile, NULL, PAGE_READWRITE, 0, 0, "bmp_fractal"); + if (NULL == hMap) { + printErrorAndExit("Error at CreateFileMapping", GetLastError()); + } + + // worker uses existing memory mapped file + } else { + + // open existing mapping object + hMap = OpenFileMapping(FILE_MAP_WRITE, FALSE, "bmp_fractal"); + if (NULL == hMap) + printErrorAndExit("Error at OpenFileMapping", GetLastError()); } - /* map the whole file into the process context */ + // map the whole file into the process context pData = MapViewOfFile(hMap, FILE_MAP_WRITE, 0, 0, 0); if (NULL == pData) { printErrorAndExit("Error at MapViewOfFile", GetLastError()); @@ -138,74 +238,169 @@ pDataBitmap = (unsigned char *)((INT_PTR)pData + sizeof(header)); // debugging - printf("pos. of file: %p\n", pData); - printf("pos. of bitmap: %p\n", pDataBitmap); - - // pointer to current pixel - pDataBitmapCurrent = pDataBitmap; + if (VERBOSE) { + fprintf(stdout, "pos. of file: %p\n", pData); + fprintf(stdout, "pos. of bitmap: %p\n", pDataBitmap); + } + + if (use_processes && is_worker_process) { + + if (VERBOSE) + fprintf(stdout, "inside worker-process\n"); + + // get segment information from command line + worker_startrow = atoi(argv[2]); + worker_rows = atoi(argv[3]); + + // allocate memory for one worker's arguments + if ((worker_args = malloc(sizeof(worker_args[0]))) == NULL) + perror("malloc"), exit(1); + + // assign worker's arguments + worker_args[0].start_row = worker_startrow; + worker_args[0].number_of_rows = worker_rows; + worker_args[0].pBitmap = pDataBitmap; + + fractal_create_segment(&worker_args[0]); + + // cleanup mmap-handle + if (!CloseHandle(hMap)) + printErrorAndExit("Error at CloseHandle", GetLastError()); + + return 0; + } + /* - // turn bitmap into white wand + // turn bitmap into white canvas for (offset = 0; offset < 500 * 500 * 3; offset++) { - //pDataBitmap[offset] = 255; - *pDataBitmapCurrent = 255; - pDataBitmapCurrent++; + *pDataBitmap = 255; + pDataBitmap++; } + exit(0); */ - // calculate segments of bitmap for worker threads/processes + // allocate memory for bitmap + /* + if ((pDataBitmap = malloc(XSIZE * YSIZE * 3 * sizeof(pDataBitmap[0]))) == NULL) + perror("malloc"), exit(1); + */ + + // allocate memory for table of all worker handles + if ((worker_handles = malloc(workers * sizeof(worker_handles[0]))) == NULL) + perror("malloc"), exit(1); + + // allocate memory for table of all worker arguments + if ((worker_args = malloc(workers * sizeof(worker_args[0]))) == NULL) + perror("malloc"), exit(1); + + + // calculate bitmap segment length for workers worker_rows = YSIZE / workers; - printf("rows for each worker: %i\n", worker_rows); + if (VERBOSE) + fprintf(stdout, "rows for each worker: %i\n", worker_rows); + + // start workers for (worker_index = 0; worker_index < workers; worker_index++) { + // debugging: just run single thread + //if (worker_index == 1) + // continue; + // number of row to start for each worker worker_startrow = worker_index * worker_rows; // recalculate number of rows for last worker if (YSIZE mod workers) != 0 if (worker_index == workers - 1) { worker_rows = YSIZE - worker_startrow; - printf("rows for last worker: %i\n", worker_rows); + if (VERBOSE) + fprintf(stdout, "rows for last worker: %i\n", worker_rows); + } + + // assign each worker's arguments + worker_args[worker_index].start_row = worker_startrow; + worker_args[worker_index].number_of_rows = worker_rows; + worker_args[worker_index].pBitmap = pDataBitmap; + + if (!use_processes) { + + worker_handles[worker_index] = CreateThread( + NULL, // LPSECURITY_ATTRIBUTES lpThreadAttributes, + 0, // SIZE_T dwStackSize, + &fractal_create_segment, // LPTHREAD_START_ROUTINE lpStartAddress, + &worker_args[worker_index], // LPVOID lpParameter, + 0, // DWORD dwCreationFlags, + NULL // LPDWORD lpThreadId + ); + + if (!worker_handles[worker_index]) + printErrorAndExit("CreateThread failed", GetLastError()); + + } else { + + _snprintf(szCmdline, 1023, "%s %s %i %i", argv[0], "--worker", worker_startrow, worker_rows); + if (VERBOSE) + fprintf(stdout, "starting worker process: %s\n", szCmdline); + ZeroMemory( &si, sizeof(si) ); + si.cb = sizeof(si); + ZeroMemory( &pi, sizeof(pi) ); + + if (!CreateProcess( + NULL, // No module name (use command line) + szCmdline, // Command line + NULL, // Process handle not inheritable + NULL, // Thread handle not inheritable + FALSE, // Set handle inheritance to FALSE + 0, // No creation flags + NULL, // Use parent's environment block + NULL, // Use parent's starting directory + &si, // Pointer to STARTUPINFO structure + &pi // Pointer to PROCESS_INFORMATION structure + )) + printErrorAndExit("CreateProcess failed", GetLastError()); + + worker_handles[worker_index] = pi.hProcess; + } - } - // calculate fractal - for (y=YSIZE-1; y>=0; y--) { - for (x=0; x