--- joko/Uni/BSArch/04/bmp_fractal.c	2006/07/01 11:45:35	1.3
+++ 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 1.3 2006/07/01 11:45:35 joko Exp $
+// $Id: bmp_fractal.c,v 1.12 2006/07/02 09:27:14 joko Exp $
 
 #include <windows.h>
 #include <stdio.h>
@@ -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);
 }
@@ -94,39 +96,138 @@
 }
 
 
-int main(int argc, char *argv[]) {
-  int len,x,y;
+// 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];
-  short svalue;
-  int lvalue;
 
-  HANDLE hMap, hFile;
-  DWORD err, size;
-  int elems;
-  
-  LPVOID pData;
-  unsigned char *pDataBitmap, *pDataBitmapCurrent;
+  thread_id = GetCurrentThreadId();
   
-  int offset;
-  
-  // create empty file (black background)
-  write_blank_file("test.bmp");
+  // 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 ???
+  }
 
-  /* 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);
+  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;
+
+  // workers
+  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)
+  if (!is_worker_process)
+    write_blank_file("test.bmp");
+
+  // 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());
@@ -137,60 +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 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 = (unsigned char *)bgr;
-            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
+  // 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;
+  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;
+      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;
+      
+    }
+
   }
 
-  
-  /* write the result into the file */
+  // wait for all threads
+  if (VERBOSE)
+    fprintf(stdout, "waiting for workers to finish...\n");
+  if (WaitForMultipleObjects(workers, worker_handles, TRUE, INFINITE) == WAIT_FAILED)
+    perror("WaitForMultipleObjects");
+
+  // debugging: just run single thread
+  //if (WaitForSingleObject(worker_handles[0], INFINITE) == WAIT_FAILED)
+  //  perror("WaitForSingleObject");
+
+  // close all worker handles
+  for (worker_index = 0; worker_index < workers; worker_index++)
+    CloseHandle(worker_handles[worker_index]);
+    
+  // write the result into the file
   if (!FlushViewOfFile(pData, 0)) {
     err = GetLastError();
     printErrorAndExit("Error at UnmapViewOfFile", err);
   }
 
-  /* remove the mapped file */
+  // remove the mapped file
   if (!UnmapViewOfFile(pData)) {
     err = GetLastError();
     printErrorAndExit("Error at UnmapViewOfFile", err);
     exit(err);
   }
   
-  /* cleanup handles */
+  // cleanup handles
   if (!CloseHandle(hMap) || !CloseHandle(hFile) ) {
     err = GetLastError();
     printErrorAndExit("Error at CloseHandle", err);
   }
 
+  free(worker_args);
+  free(worker_handles);
+  
+  return 0;
+  
 }