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Sweden-Number/windows/queue.c

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/*
* Message queues related functions
*
* Copyright 1993, 1994 Alexandre Julliard
*/
#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 "debugtools.h"
#include "wine/server.h"
#include "spy.h"
DEFAULT_DEBUG_CHANNEL(msg);
static PERQUEUEDATA *pQDataWin16 = NULL; /* Global perQData for Win16 tasks */
HQUEUE16 hActiveQueue = 0;
/***********************************************************************
* PERQDATA_Addref
*
* Increment reference count for the PERQUEUEDATA instance
* Returns reference count for debugging purposes
*/
static void PERQDATA_Addref( PERQUEUEDATA *pQData )
{
assert(pQData != 0 );
TRACE_(msg)("(): current refcount %lu ...\n", pQData->ulRefCount);
InterlockedIncrement( &pQData->ulRefCount );
}
/***********************************************************************
* PERQDATA_Release
*
* Release a reference to a PERQUEUEDATA instance.
* Destroy the instance if no more references exist
* Returns reference count for debugging purposes
*/
static void PERQDATA_Release( PERQUEUEDATA *pQData )
{
assert(pQData != 0 );
TRACE_(msg)("(): current refcount %lu ...\n",
(LONG)pQData->ulRefCount );
if (!InterlockedDecrement( &pQData->ulRefCount ))
{
DeleteCriticalSection( &pQData->cSection );
TRACE_(msg)("(): deleting PERQUEUEDATA instance ...\n" );
/* Deleting our global 16 bit perQData? */
if ( pQData == pQDataWin16 ) pQDataWin16 = 0;
/* Free the PERQUEUEDATA instance */
HeapFree( GetProcessHeap(), 0, pQData );
}
}
/***********************************************************************
* PERQDATA_CreateInstance
*
* Creates an instance of a reference counted PERQUEUEDATA element
* for the message queue. perQData is stored globally for 16 bit tasks.
*
* Note: We don't implement perQdata exactly the same way Windows does.
* Each perQData element is reference counted since it may be potentially
* shared by multiple message Queues (via AttachThreadInput).
* We only store the current values for Active, Capture and focus windows
* currently.
*/
static PERQUEUEDATA * PERQDATA_CreateInstance(void)
{
PERQUEUEDATA *pQData;
BOOL16 bIsWin16 = 0;
TRACE_(msg)("()\n");
/* Share a single instance of perQData for all 16 bit tasks */
if ( ( bIsWin16 = !(NtCurrentTeb()->tibflags & TEBF_WIN32) ) )
{
/* If previously allocated, just bump up ref count */
if ( pQDataWin16 )
{
PERQDATA_Addref( pQDataWin16 );
return pQDataWin16;
}
}
/* Allocate PERQUEUEDATA from the system heap */
if (!( pQData = (PERQUEUEDATA *) HeapAlloc( GetProcessHeap(), 0,
sizeof(PERQUEUEDATA) ) ))
return 0;
/* Initialize */
pQData->hWndCapture = pQData->hWndFocus = pQData->hWndActive = 0;
pQData->ulRefCount = 1;
pQData->nCaptureHT = HTCLIENT;
/* Note: We have an independent critical section for the per queue data
* since this may be shared by different threads. see AttachThreadInput()
*/
InitializeCriticalSection( &pQData->cSection );
/* FIXME: not all per queue data critical sections should be global */
MakeCriticalSectionGlobal( &pQData->cSection );
/* Save perQData globally for 16 bit tasks */
if ( bIsWin16 )
pQDataWin16 = pQData;
return pQData;
}
/***********************************************************************
* PERQDATA_GetFocusWnd
*
* Get the focus hwnd member in a threadsafe manner
*/
HWND PERQDATA_GetFocusWnd( PERQUEUEDATA *pQData )
{
HWND hWndFocus;
assert(pQData != 0 );
EnterCriticalSection( &pQData->cSection );
hWndFocus = pQData->hWndFocus;
LeaveCriticalSection( &pQData->cSection );
return hWndFocus;
}
/***********************************************************************
* PERQDATA_SetFocusWnd
*
* Set the focus hwnd member in a threadsafe manner
*/
HWND PERQDATA_SetFocusWnd( PERQUEUEDATA *pQData, HWND hWndFocus )
{
HWND hWndFocusPrv;
assert(pQData != 0 );
EnterCriticalSection( &pQData->cSection );
hWndFocusPrv = pQData->hWndFocus;
pQData->hWndFocus = hWndFocus;
LeaveCriticalSection( &pQData->cSection );
return hWndFocusPrv;
}
/***********************************************************************
* PERQDATA_GetActiveWnd
*
* Get the active hwnd member in a threadsafe manner
*/
HWND PERQDATA_GetActiveWnd( PERQUEUEDATA *pQData )
{
HWND hWndActive;
assert(pQData != 0 );
EnterCriticalSection( &pQData->cSection );
hWndActive = pQData->hWndActive;
LeaveCriticalSection( &pQData->cSection );
return hWndActive;
}
/***********************************************************************
* PERQDATA_SetActiveWnd
*
* Set the active focus hwnd member in a threadsafe manner
*/
HWND PERQDATA_SetActiveWnd( PERQUEUEDATA *pQData, HWND hWndActive )
{
HWND hWndActivePrv;
assert(pQData != 0 );
EnterCriticalSection( &pQData->cSection );
hWndActivePrv = pQData->hWndActive;
pQData->hWndActive = hWndActive;
LeaveCriticalSection( &pQData->cSection );
return hWndActivePrv;
}
/***********************************************************************
* PERQDATA_GetCaptureWnd
*
* Get the capture hwnd member in a threadsafe manner
*/
HWND PERQDATA_GetCaptureWnd( INT *hittest )
{
MESSAGEQUEUE *queue;
PERQUEUEDATA *pQData;
HWND hWndCapture;
if (!(queue = QUEUE_Current())) return 0;
pQData = queue->pQData;
EnterCriticalSection( &pQData->cSection );
hWndCapture = pQData->hWndCapture;
*hittest = pQData->nCaptureHT;
LeaveCriticalSection( &pQData->cSection );
return hWndCapture;
}
/***********************************************************************
* PERQDATA_SetCaptureWnd
*
* Set the capture hwnd member in a threadsafe manner
*/
HWND PERQDATA_SetCaptureWnd( HWND hWndCapture, INT hittest )
{
MESSAGEQUEUE *queue;
PERQUEUEDATA *pQData;
HWND hWndCapturePrv;
if (!(queue = QUEUE_Current())) return 0;
pQData = queue->pQData;
EnterCriticalSection( &pQData->cSection );
hWndCapturePrv = pQData->hWndCapture;
pQData->hWndCapture = hWndCapture;
pQData->nCaptureHT = hittest;
LeaveCriticalSection( &pQData->cSection );
return hWndCapturePrv;
}
/***********************************************************************
* 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 )
{
SERVER_CALL_ERR();
handle = req->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;
/* Create and initialize our per queue data */
msgQueue->pQData = bCreatePerQData ? PERQDATA_CreateInstance() : NULL;
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;
if( hActiveQueue == hQueue ) hActiveQueue = 0;
HeapLock( GetProcessHeap() ); /* FIXME: a bit overkill */
/* Release per queue data if present */
if ( msgQueue->pQData )
{
PERQDATA_Release( msgQueue->pQData );
msgQueue->pQData = 0;
}
msgQueue->self = 0;
HeapUnlock( GetProcessHeap() );
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;
SERVER_CALL();
ret = MAKELONG( req->changed_bits & flags, req->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;
SERVER_CALL();
ret = req->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;
}
/**********************************************************************
* AttachThreadInput (USER32.@) Attaches input of 1 thread to other
*
* Attaches the input processing mechanism of one thread to that of
* another thread.
*
* RETURNS
* Success: TRUE
* Failure: FALSE
*
* TODO:
* 1. Reset the Key State (currenly per thread key state is not maintained)
*/
BOOL WINAPI AttachThreadInput(
DWORD idAttach, /* [in] Thread to attach */
DWORD idAttachTo, /* [in] Thread to attach to */
BOOL fAttach) /* [in] Attach or detach */
{
MESSAGEQUEUE *pSrcMsgQ = 0, *pTgtMsgQ = 0;
BOOL16 bRet = 0;
SetLastError(ERROR_CALL_NOT_IMPLEMENTED);
/* A thread cannot attach to itself */
if ( idAttach == idAttachTo )
goto CLEANUP;
/* According to the docs this method should fail if a
* "Journal record" hook is installed. (attaches all input queues together)
*/
if ( HOOK_IsHooked( WH_JOURNALRECORD ) )
goto CLEANUP;
/* Retrieve message queues corresponding to the thread id's */
pTgtMsgQ = QUEUE_Lock( GetThreadQueue16( idAttach ) );
pSrcMsgQ = QUEUE_Lock( GetThreadQueue16( idAttachTo ) );
/* Ensure we have message queues and that Src and Tgt threads
* are not system threads.
*/
if ( !pSrcMsgQ || !pTgtMsgQ || !pSrcMsgQ->pQData || !pTgtMsgQ->pQData )
goto CLEANUP;
if (fAttach) /* Attach threads */
{
/* Only attach if currently detached */
if ( pTgtMsgQ->pQData != pSrcMsgQ->pQData )
{
/* First release the target threads perQData */
PERQDATA_Release( pTgtMsgQ->pQData );
/* Share a reference to the source threads perQDATA */
PERQDATA_Addref( pSrcMsgQ->pQData );
pTgtMsgQ->pQData = pSrcMsgQ->pQData;
}
}
else /* Detach threads */
{
/* Only detach if currently attached */
if ( pTgtMsgQ->pQData == pSrcMsgQ->pQData )
{
/* First release the target threads perQData */
PERQDATA_Release( pTgtMsgQ->pQData );
/* Give the target thread its own private perQDATA once more */
pTgtMsgQ->pQData = PERQDATA_CreateInstance();
}
}
/* TODO: Reset the Key State */
bRet = 1; /* Success */
CLEANUP:
/* Unlock the queues before returning */
if ( pSrcMsgQ )
QUEUE_Unlock( pSrcMsgQ );
if ( pTgtMsgQ )
QUEUE_Unlock( pTgtMsgQ );
return bRet;
}
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