source: trunk/src/user32/win32wndhandle.cpp@ 8202

/* $Id: win32wndhandle.cpp,v 1.11 2002-04-07 14:37:00 sandervl Exp $ */
/*
 * Win32 Handle Management Code for OS/2
 *
 *
 * Copyright 1998 Sander van Leeuwen (sandervl@xs4all.nl)
 *
 *
 * TODO: The table should be dynamically increased when necessary
 *       This is just a quick and dirty implementation 
 * TODO: Probably need to clean up the table when app closes
 *       (also store PID and remove all handles with PID of terminating app)
 * 
 * Project Odin Software License can be found in LICENSE.TXT
 *
 */

#include <os2win.h>
#include <vmutex.h>
#include "win32wndhandle.h"

#define DBG_LOCALLOG    DBG_win32wndhandle
#include "dbglocal.h"

//******************************************************************************

//Global DLL Data
#pragma data_seg(_GLOBALDATA)
ULONG                WindowHandleTable[MAX_WINDOW_HANDLES] = {0};
CRITICAL_SECTION_OS2 globalwhandlecritsect = {0};
ULONG  lastIndex = 0;
#pragma data_seg()

//******************************************************************************
//******************************************************************************
void InitializeWindowHandles()
{
    if(globalwhandlecritsect.hmtxLock == 0) {
         DosInitializeCriticalSection(&globalwhandlecritsect, WINHANDLE_CRITSECTION_NAME);
    }
    else {
         dprintf(("InitializeWindowHandles -> access shared critical section"));
         DosAccessCriticalSection(&globalwhandlecritsect, WINHANDLE_CRITSECTION_NAME);
    }
}
//******************************************************************************
//******************************************************************************
BOOL HwAllocateWindowHandle(HWND *hwnd, DWORD dwUserData)
{
  DosEnterCriticalSection(&globalwhandlecritsect);

  //find next free handle
  if(lastIndex >= MAX_WINDOW_HANDLES-1) {
        lastIndex = 0;
  }
  for(int i=lastIndex;i<MAX_WINDOW_HANDLES;i++) {
        if(WindowHandleTable[i] == 0) {
                lastIndex = i;
                break;
        }
  }
  if(i == MAX_WINDOW_HANDLES) {
        //oops, out of handles
        DosLeaveCriticalSection(&globalwhandlecritsect);
        dprintf(("ERROR: USER32: HwAllocateWindowHandle OUT OF WINDOW HANDLES!!"));
        DebugInt3();
        return FALSE;
  }
  *hwnd  = lastIndex;
  *hwnd |= WNDHANDLE_MAGIC_HIGHWORD;
  WindowHandleTable[lastIndex] = dwUserData;

  lastIndex++;
  DosLeaveCriticalSection(&globalwhandlecritsect);
  return TRUE;
}
//******************************************************************************
//******************************************************************************
void HwFreeWindowHandle(HWND hwnd)
{
  hwnd &= WNDHANDLE_MAGIC_MASK;
  if(hwnd < MAX_WINDOW_HANDLES) {
        DosEnterCriticalSection(&globalwhandlecritsect);
        WindowHandleTable[hwnd] = 0;
        DosLeaveCriticalSection(&globalwhandlecritsect);
  }
}
//******************************************************************************
//******************************************************************************
/* 2001-10-17 PH
 * Note: this function is repeated as "inline macro" in win32wbase.cpp.
 * Changes here must be reflected there, tool.
 */
BOOL HwGetWindowHandleData(HWND hwnd, DWORD *pdwUserData)
{
  if((hwnd & 0xFFFF0000) != WNDHANDLE_MAGIC_HIGHWORD) {
        return FALSE; //unknown window (PM?)
  }
  hwnd &= WNDHANDLE_MAGIC_MASK;
  if(hwnd < MAX_WINDOW_HANDLES) {
        *pdwUserData = WindowHandleTable[hwnd];
        return TRUE;
  }
  *pdwUserData = 0;
  return FALSE;
}
//******************************************************************************
//******************************************************************************