Sweden-Number/windows/queue.c

354 lines
8.7 KiB
C

/*
* Message queues related functions
*
* Copyright 1993, 1994 Alexandre Julliard
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <string.h>
#include <signal.h>
#include <assert.h>
#include "windef.h"
#include "wingdi.h"
#include "winerror.h"
#include "wine/winbase16.h"
#include "wine/winuser16.h"
#include "queue.h"
#include "win.h"
#include "user.h"
#include "hook.h"
#include "thread.h"
#include "wine/debug.h"
#include "wine/server.h"
#include "spy.h"
WINE_DEFAULT_DEBUG_CHANNEL(msg);
/***********************************************************************
* QUEUE_Lock
*
* Function for getting a 32 bit pointer on queue structure. For thread
* safeness programmers should use this function instead of GlobalLock to
* retrieve a pointer on the structure. QUEUE_Unlock should also be called
* when access to the queue structure is not required anymore.
*/
MESSAGEQUEUE *QUEUE_Lock( HQUEUE16 hQueue )
{
MESSAGEQUEUE *queue;
HeapLock( GetProcessHeap() ); /* FIXME: a bit overkill */
queue = GlobalLock16( hQueue );
if ( !queue || (queue->magic != QUEUE_MAGIC) )
{
HeapUnlock( GetProcessHeap() );
return NULL;
}
queue->lockCount++;
HeapUnlock( GetProcessHeap() );
return queue;
}
/***********************************************************************
* QUEUE_Current
*
* Get the current thread queue, creating it if required.
* QUEUE_Unlock is not needed since the queue can only be deleted by
* the current thread anyway.
*/
MESSAGEQUEUE *QUEUE_Current(void)
{
MESSAGEQUEUE *queue;
HQUEUE16 hQueue;
if (!(hQueue = GetThreadQueue16(0)))
{
if (!(hQueue = InitThreadInput16( 0, 0 ))) return NULL;
}
if ((queue = GlobalLock16( hQueue )))
{
if (queue->magic != QUEUE_MAGIC) queue = NULL;
}
return queue;
}
/***********************************************************************
* QUEUE_Unlock
*
* Use with QUEUE_Lock to get a thread safe access to message queue
* structure
*/
void QUEUE_Unlock( MESSAGEQUEUE *queue )
{
if (queue)
{
HeapLock( GetProcessHeap() ); /* FIXME: a bit overkill */
if ( --queue->lockCount == 0 )
{
if (queue->server_queue)
CloseHandle( queue->server_queue );
GlobalFree16( queue->self );
}
HeapUnlock( GetProcessHeap() );
}
}
/***********************************************************************
* QUEUE_CreateMsgQueue
*
* Creates a message queue. Doesn't link it into queue list!
*/
static HQUEUE16 QUEUE_CreateMsgQueue( BOOL16 bCreatePerQData )
{
HQUEUE16 hQueue;
HANDLE handle;
MESSAGEQUEUE * msgQueue;
TRACE_(msg)("(): Creating message queue...\n");
if (!(hQueue = GlobalAlloc16( GMEM_FIXED | GMEM_ZEROINIT,
sizeof(MESSAGEQUEUE) )))
return 0;
msgQueue = (MESSAGEQUEUE *) GlobalLock16( hQueue );
if ( !msgQueue )
return 0;
if (bCreatePerQData)
{
SERVER_START_REQ( get_msg_queue )
{
wine_server_call_err( req );
handle = reply->handle;
}
SERVER_END_REQ;
if (!handle)
{
ERR_(msg)("Cannot get thread queue");
GlobalFree16( hQueue );
return 0;
}
msgQueue->server_queue = handle;
}
msgQueue->self = hQueue;
msgQueue->lockCount = 1;
msgQueue->magic = QUEUE_MAGIC;
return hQueue;
}
/***********************************************************************
* QUEUE_DeleteMsgQueue
*
* Unlinks and deletes a message queue.
*
* Note: We need to mask asynchronous events to make sure PostMessage works
* even in the signal handler.
*/
void QUEUE_DeleteMsgQueue(void)
{
HQUEUE16 hQueue = GetThreadQueue16(0);
MESSAGEQUEUE * msgQueue;
if (!hQueue) return; /* thread doesn't have a queue */
TRACE("(): Deleting message queue %04x\n", hQueue);
if (!(msgQueue = QUEUE_Lock(hQueue)))
{
ERR("invalid thread queue\n");
return;
}
msgQueue->magic = 0;
msgQueue->self = 0;
SetThreadQueue16( 0, 0 );
/* free up resource used by MESSAGEQUEUE structure */
msgQueue->lockCount--;
QUEUE_Unlock( msgQueue );
}
/***********************************************************************
* GetWindowTask (USER.224)
*/
HTASK16 WINAPI GetWindowTask16( HWND16 hwnd )
{
HTASK16 retvalue;
MESSAGEQUEUE *queue;
WND *wndPtr = WIN_FindWndPtr16( hwnd );
if (!wndPtr) return 0;
queue = QUEUE_Lock( wndPtr->hmemTaskQ );
WIN_ReleaseWndPtr(wndPtr);
if (!queue) return 0;
retvalue = queue->teb->htask16;
QUEUE_Unlock( queue );
return retvalue;
}
/***********************************************************************
* InitThreadInput (USER.409)
*/
HQUEUE16 WINAPI InitThreadInput16( WORD unknown, WORD flags )
{
MESSAGEQUEUE *queuePtr;
HQUEUE16 hQueue = NtCurrentTeb()->queue;
if ( !hQueue )
{
/* Create thread message queue */
if( !(hQueue = QUEUE_CreateMsgQueue( TRUE )))
{
ERR_(msg)("failed!\n");
return FALSE;
}
/* Link new queue into list */
queuePtr = QUEUE_Lock( hQueue );
queuePtr->teb = NtCurrentTeb();
HeapLock( GetProcessHeap() ); /* FIXME: a bit overkill */
SetThreadQueue16( 0, hQueue );
NtCurrentTeb()->queue = hQueue;
HeapUnlock( GetProcessHeap() );
QUEUE_Unlock( queuePtr );
}
return hQueue;
}
/***********************************************************************
* GetQueueStatus (USER32.@)
*/
DWORD WINAPI GetQueueStatus( UINT flags )
{
DWORD ret = 0;
SERVER_START_REQ( get_queue_status )
{
req->clear = 1;
wine_server_call( req );
ret = MAKELONG( reply->changed_bits & flags, reply->wake_bits & flags );
}
SERVER_END_REQ;
return ret;
}
/***********************************************************************
* GetInputState (USER32.@)
*/
BOOL WINAPI GetInputState(void)
{
DWORD ret = 0;
SERVER_START_REQ( get_queue_status )
{
req->clear = 0;
wine_server_call( req );
ret = reply->wake_bits & (QS_KEY | QS_MOUSEBUTTON);
}
SERVER_END_REQ;
return ret;
}
/***********************************************************************
* GetMessagePos (USER.119)
* GetMessagePos (USER32.@)
*
* The GetMessagePos() function returns a long value representing a
* cursor position, in screen coordinates, when the last message
* retrieved by the GetMessage() function occurs. The x-coordinate is
* in the low-order word of the return value, the y-coordinate is in
* the high-order word. The application can use the MAKEPOINT()
* macro to obtain a POINT structure from the return value.
*
* For the current cursor position, use GetCursorPos().
*
* RETURNS
*
* Cursor position of last message on success, zero on failure.
*
* CONFORMANCE
*
* ECMA-234, Win32
*
*/
DWORD WINAPI GetMessagePos(void)
{
MESSAGEQUEUE *queue;
if (!(queue = QUEUE_Current())) return 0;
return queue->GetMessagePosVal;
}
/***********************************************************************
* GetMessageTime (USER.120)
* GetMessageTime (USER32.@)
*
* GetMessageTime() returns the message time for the last message
* retrieved by the function. The time is measured in milliseconds with
* the same offset as GetTickCount().
*
* Since the tick count wraps, this is only useful for moderately short
* relative time comparisons.
*
* RETURNS
*
* Time of last message on success, zero on failure.
*
* CONFORMANCE
*
* ECMA-234, Win32
*
*/
LONG WINAPI GetMessageTime(void)
{
MESSAGEQUEUE *queue;
if (!(queue = QUEUE_Current())) return 0;
return queue->GetMessageTimeVal;
}
/***********************************************************************
* GetMessageExtraInfo (USER.288)
* GetMessageExtraInfo (USER32.@)
*/
LONG WINAPI GetMessageExtraInfo(void)
{
MESSAGEQUEUE *queue;
if (!(queue = QUEUE_Current())) return 0;
return queue->GetMessageExtraInfoVal;
}