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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 "hook.h"
#include "heap.h"
#include "thread.h"
#include "debugtools.h"
#include "server.h"
#include "spy.h"
DECLARE_DEBUG_CHANNEL(msg);
DECLARE_DEBUG_CHANNEL(sendmsg);
#define MAX_QUEUE_SIZE 120 /* Max. size of a message queue */
static HQUEUE16 hFirstQueue = 0;
static HQUEUE16 hExitingQueue = 0;
static HQUEUE16 hmemSysMsgQueue = 0;
static MESSAGEQUEUE *sysMsgQueue = NULL;
static PERQUEUEDATA *pQDataWin16 = NULL; /* Global perQData for Win16 tasks */
static MESSAGEQUEUE *pMouseQueue = NULL; /* Queue for last mouse message */
static MESSAGEQUEUE *pKbdQueue = NULL; /* Queue for last kbd message */
HQUEUE16 hCursorQueue = 0;
HQUEUE16 hActiveQueue = 0;
/***********************************************************************
* 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.
*/
PERQUEUEDATA * PERQDATA_CreateInstance( )
{
PERQUEUEDATA *pQData;
BOOL16 bIsWin16 = 0;
TRACE_(msg)("()\n");
/* Share a single instance of perQData for all 16 bit tasks */
if ( ( bIsWin16 = THREAD_IsWin16( NtCurrentTeb() ) ) )
{
/* 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( SystemHeap, 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_Addref
*
* Increment reference count for the PERQUEUEDATA instance
* Returns reference count for debugging purposes
*/
ULONG PERQDATA_Addref( PERQUEUEDATA *pQData )
{
assert(pQData != 0 );
TRACE_(msg)("(): current refcount %lu ...\n", pQData->ulRefCount);
EnterCriticalSection( &pQData->cSection );
++pQData->ulRefCount;
LeaveCriticalSection( &pQData->cSection );
return 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
*/
ULONG PERQDATA_Release( PERQUEUEDATA *pQData )
{
assert(pQData != 0 );
TRACE_(msg)("(): current refcount %lu ...\n",
(LONG)pQData->ulRefCount );
EnterCriticalSection( &pQData->cSection );
if ( --pQData->ulRefCount == 0 )
{
LeaveCriticalSection( &pQData->cSection );
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( SystemHeap, 0, pQData );
return 0;
}
LeaveCriticalSection( &pQData->cSection );
return pQData->ulRefCount;
}
/***********************************************************************
* 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( PERQUEUEDATA *pQData )
{
HWND hWndCapture;
assert(pQData != 0 );
EnterCriticalSection( &pQData->cSection );
hWndCapture = pQData->hWndCapture;
LeaveCriticalSection( &pQData->cSection );
return hWndCapture;
}
/***********************************************************************
* PERQDATA_SetCaptureWnd
*
* Set the capture hwnd member in a threadsafe manner
*/
HWND PERQDATA_SetCaptureWnd( PERQUEUEDATA *pQData, HWND hWndCapture )
{
HWND hWndCapturePrv;
assert(pQData != 0 );
EnterCriticalSection( &pQData->cSection );
hWndCapturePrv = pQData->hWndCapture;
pQData->hWndCapture = hWndCapture;
LeaveCriticalSection( &pQData->cSection );
return hWndCapturePrv;
}
/***********************************************************************
* PERQDATA_GetCaptureInfo
*
* Get the capture info member in a threadsafe manner
*/
INT16 PERQDATA_GetCaptureInfo( PERQUEUEDATA *pQData )
{
INT16 nCaptureHT;
assert(pQData != 0 );
EnterCriticalSection( &pQData->cSection );
nCaptureHT = pQData->nCaptureHT;
LeaveCriticalSection( &pQData->cSection );
return nCaptureHT;
}
/***********************************************************************
* PERQDATA_SetCaptureInfo
*
* Set the capture info member in a threadsafe manner
*/
INT16 PERQDATA_SetCaptureInfo( PERQUEUEDATA *pQData, INT16 nCaptureHT )
{
INT16 nCaptureHTPrv;
assert(pQData != 0 );
EnterCriticalSection( &pQData->cSection );
nCaptureHTPrv = pQData->nCaptureHT;
pQData->nCaptureHT = nCaptureHT;
LeaveCriticalSection( &pQData->cSection );
return nCaptureHTPrv;
}
/***********************************************************************
* 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( SystemHeap ); /* FIXME: a bit overkill */
queue = GlobalLock16( hQueue );
if ( !queue || (queue->magic != QUEUE_MAGIC) )
{
HeapUnlock( SystemHeap );
return NULL;
}
queue->lockCount++;
HeapUnlock( SystemHeap );
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( SystemHeap ); /* FIXME: a bit overkill */
if ( --queue->lockCount == 0 )
{
DeleteCriticalSection ( &queue->cSection );
if (queue->server_queue)
CloseHandle( queue->server_queue );
GlobalFree16( queue->self );
}
HeapUnlock( SystemHeap );
}
}
/***********************************************************************
* QUEUE_DumpQueue
*/
void QUEUE_DumpQueue( HQUEUE16 hQueue )
{
MESSAGEQUEUE *pq;
if (!(pq = QUEUE_Lock( hQueue )) )
{
WARN_(msg)("%04x is not a queue handle\n", hQueue );
return;
}
EnterCriticalSection( &pq->cSection );
DPRINTF( "next: %12.4x Intertask SendMessage:\n"
"thread: %10p ----------------------\n"
"firstMsg: %8p smWaiting: %10p\n"
"lastMsg: %8p smPending: %10p\n"
"msgCount: %8.4x smProcessing: %10p\n"
"lockCount: %7.4x\n"
"paints: %10.4x\n"
"timers: %10.4x\n"
"wakeBits: %8.4x\n"
"wakeMask: %8.4x\n"
"hCurHook: %8.4x\n",
pq->next, pq->teb, pq->firstMsg, pq->smWaiting, pq->lastMsg,
pq->smPending, pq->msgCount, pq->smProcessing,
(unsigned)pq->lockCount, pq->wPaintCount, pq->wTimerCount,
pq->wakeBits, pq->wakeMask, pq->hCurHook);
LeaveCriticalSection( &pq->cSection );
QUEUE_Unlock( pq );
}
/***********************************************************************
* QUEUE_WalkQueues
*/
void QUEUE_WalkQueues(void)
{
char module[10];
HQUEUE16 hQueue = hFirstQueue;
DPRINTF( "Queue Msgs Thread Task Module\n" );
while (hQueue)
{
MESSAGEQUEUE *queue = QUEUE_Lock( hQueue );
if (!queue)
{
WARN_(msg)("Bad queue handle %04x\n", hQueue );
return;
}
if (!GetModuleName16( queue->teb->htask16, module, sizeof(module )))
strcpy( module, "???" );
DPRINTF( "%04x %4d %p %04x %s\n", hQueue,queue->msgCount,
queue->teb, queue->teb->htask16, module );
hQueue = queue->next;
QUEUE_Unlock( queue );
}
DPRINTF( "\n" );
}
/***********************************************************************
* QUEUE_IsExitingQueue
*/
BOOL QUEUE_IsExitingQueue( HQUEUE16 hQueue )
{
return (hExitingQueue && (hQueue == hExitingQueue));
}
/***********************************************************************
* QUEUE_SetExitingQueue
*/
void QUEUE_SetExitingQueue( HQUEUE16 hQueue )
{
hExitingQueue = hQueue;
}
/***********************************************************************
* 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;
SERVER_START_REQ
{
struct get_msg_queue_request *req = server_alloc_req( sizeof(*req), 0 );
server_call( REQ_GET_MSG_QUEUE );
handle = req->handle;
}
SERVER_END_REQ;
if (!handle)
{
ERR_(msg)("Cannot get thread queue");
GlobalFree16( hQueue );
return 0;
}
msgQueue->server_queue = handle;
msgQueue->server_queue = ConvertToGlobalHandle( msgQueue->server_queue );
msgQueue->self = hQueue;
msgQueue->wakeBits = msgQueue->changeBits = 0;
InitializeCriticalSection( &msgQueue->cSection );
MakeCriticalSectionGlobal( &msgQueue->cSection );
msgQueue->lockCount = 1;
msgQueue->magic = QUEUE_MAGIC;
/* Create and initialize our per queue data */
msgQueue->pQData = bCreatePerQData ? PERQDATA_CreateInstance() : NULL;
return hQueue;
}
/***********************************************************************
* QUEUE_FlushMessage
*
* Try to reply to all pending sent messages on exit.
*/
static void QUEUE_FlushMessages( MESSAGEQUEUE *queue )
{
SMSG *smsg;
MESSAGEQUEUE *senderQ = 0;
if( queue )
{
EnterCriticalSection( &queue->cSection );
/* empty the list of pending SendMessage waiting to be received */
while (queue->smPending)
{
smsg = QUEUE_RemoveSMSG( queue, SM_PENDING_LIST, 0);
senderQ = QUEUE_Lock( smsg->hSrcQueue );
if ( !senderQ )
continue;
/* return 0, to unblock other thread */
smsg->lResult = 0;
smsg->flags |= SMSG_HAVE_RESULT;
QUEUE_SetWakeBit( senderQ, QS_SMRESULT);
QUEUE_Unlock( senderQ );
}
QUEUE_ClearWakeBit( queue, QS_SENDMESSAGE );
LeaveCriticalSection( &queue->cSection );
}
}
/***********************************************************************
* 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.
*/
BOOL QUEUE_DeleteMsgQueue( HQUEUE16 hQueue )
{
MESSAGEQUEUE * msgQueue = QUEUE_Lock(hQueue);
HQUEUE16 *pPrev;
TRACE_(msg)("(): Deleting message queue %04x\n", hQueue);
if (!hQueue || !msgQueue)
{
ERR_(msg)("invalid argument.\n");
return 0;
}
msgQueue->magic = 0;
if( hCursorQueue == hQueue ) hCursorQueue = 0;
if( hActiveQueue == hQueue ) hActiveQueue = 0;
/* flush sent messages */
QUEUE_FlushMessages( msgQueue );
HeapLock( SystemHeap ); /* FIXME: a bit overkill */
/* Release per queue data if present */
if ( msgQueue->pQData )
{
PERQDATA_Release( msgQueue->pQData );
msgQueue->pQData = 0;
}
/* remove the message queue from the global link list */
pPrev = &hFirstQueue;
while (*pPrev && (*pPrev != hQueue))
{
MESSAGEQUEUE *msgQ = (MESSAGEQUEUE*)GlobalLock16(*pPrev);
/* sanity check */
if ( !msgQ || (msgQ->magic != QUEUE_MAGIC) )
{
/* HQUEUE link list is corrupted, try to exit gracefully */
ERR_(msg)("HQUEUE link list corrupted!\n");
pPrev = 0;
break;
}
pPrev = &msgQ->next;
}
if (pPrev && *pPrev) *pPrev = msgQueue->next;
msgQueue->self = 0;
HeapUnlock( SystemHeap );
/* free up resource used by MESSAGEQUEUE structure */
msgQueue->lockCount--;
QUEUE_Unlock( msgQueue );
return 1;
}
/***********************************************************************
* QUEUE_CreateSysMsgQueue
*
* Create the system message queue, and set the double-click speed.
* Must be called only once.
*/
BOOL QUEUE_CreateSysMsgQueue( int size )
{
/* Note: We dont need perQ data for the system message queue */
if (!(hmemSysMsgQueue = QUEUE_CreateMsgQueue( FALSE )))
return FALSE;
sysMsgQueue = (MESSAGEQUEUE *) GlobalLock16( hmemSysMsgQueue );
return TRUE;
}
/***********************************************************************
* QUEUE_GetSysQueue
*/
MESSAGEQUEUE *QUEUE_GetSysQueue(void)
{
return sysMsgQueue;
}
/***********************************************************************
* QUEUE_SetWakeBit
*
* See "Windows Internals", p.449
*/
static BOOL QUEUE_TrySetWakeBit( MESSAGEQUEUE *queue, WORD bit, BOOL always )
{
BOOL wake = FALSE;
EnterCriticalSection( &queue->cSection );
TRACE_(msg)("queue = %04x (wm=%04x), bit = %04x, always = %d\n",
queue->self, queue->wakeMask, bit, always );
if ((queue->wakeMask & bit) || always)
{
if (bit & QS_MOUSE) pMouseQueue = queue;
if (bit & QS_KEY) pKbdQueue = queue;
queue->changeBits |= bit;
queue->wakeBits |= bit;
}
if (queue->wakeMask & bit)
{
queue->wakeMask = 0;
wake = TRUE;
}
LeaveCriticalSection( &queue->cSection );
if ( wake )
{
/* Wake up thread waiting for message */
if ( THREAD_IsWin16( queue->teb ) )
{
int iWndsLock = WIN_SuspendWndsLock();
PostEvent16( queue->teb->htask16 );
WIN_RestoreWndsLock( iWndsLock );
}
else
{
SERVER_START_REQ
{
struct wake_queue_request *req = server_alloc_req( sizeof(*req), 0 );
req->handle = queue->server_queue;
req->bits = bit;
server_call( REQ_WAKE_QUEUE );
}
SERVER_END_REQ;
}
}
return wake;
}
void QUEUE_SetWakeBit( MESSAGEQUEUE *queue, WORD bit )
{
QUEUE_TrySetWakeBit( queue, bit, TRUE );
}
/***********************************************************************
* QUEUE_ClearWakeBit
*/
void QUEUE_ClearWakeBit( MESSAGEQUEUE *queue, WORD bit )
{
EnterCriticalSection( &queue->cSection );
queue->changeBits &= ~bit;
queue->wakeBits &= ~bit;
LeaveCriticalSection( &queue->cSection );
}
/***********************************************************************
* QUEUE_TestWakeBit
*/
WORD QUEUE_TestWakeBit( MESSAGEQUEUE *queue, WORD bit )
{
WORD ret;
EnterCriticalSection( &queue->cSection );
ret = queue->wakeBits & bit;
LeaveCriticalSection( &queue->cSection );
return ret;
}
/***********************************************************************
* QUEUE_WaitBits
*
* See "Windows Internals", p.447
*
* return values:
* 0 if exit with timeout
* 1 otherwise
*/
int QUEUE_WaitBits( WORD bits, DWORD timeout )
{
MESSAGEQUEUE *queue;
DWORD curTime = 0;
HQUEUE16 hQueue;
TRACE_(msg)("q %04x waiting for %04x\n", GetFastQueue16(), bits);
if ( THREAD_IsWin16( NtCurrentTeb() ) && (timeout != INFINITE) )
curTime = GetTickCount();
hQueue = GetFastQueue16();
if (!(queue = QUEUE_Lock( hQueue ))) return 0;
for (;;)
{
EnterCriticalSection( &queue->cSection );
if (queue->changeBits & bits)
{
/* One of the bits is set; we can return */
queue->wakeMask = 0;
LeaveCriticalSection( &queue->cSection );
QUEUE_Unlock( queue );
return 1;
}
if (queue->wakeBits & QS_SENDMESSAGE)
{
/* Process the sent message immediately */
queue->wakeMask = 0;
LeaveCriticalSection( &queue->cSection );
QUEUE_ReceiveMessage( queue );
continue; /* nested sm crux */
}
queue->wakeMask = bits | QS_SENDMESSAGE;
TRACE_(msg)("%04x) wakeMask is %04x, waiting\n", queue->self, queue->wakeMask);
LeaveCriticalSection( &queue->cSection );
if ( !THREAD_IsWin16( NtCurrentTeb() ) )
{
BOOL bHasWin16Lock;
DWORD dwlc;
if ( (bHasWin16Lock = _ConfirmWin16Lock()) )
{
TRACE_(msg)("bHasWin16Lock=TRUE\n");
ReleaseThunkLock( &dwlc );
}
WaitForSingleObject( queue->server_queue, timeout );
if ( bHasWin16Lock )
{
RestoreThunkLock( dwlc );
}
}
else
{
if ( timeout == INFINITE )
WaitEvent16( 0 ); /* win 16 thread, use WaitEvent */
else
{
/* check for timeout, then give control to other tasks */
if (GetTickCount() - curTime > timeout)
{
QUEUE_Unlock( queue );
return 0; /* exit with timeout */
}
K32WOWYield16();
}
}
}
}
/***********************************************************************
* QUEUE_AddSMSG
*
* This routine is called when a SMSG need to be added to one of the three
* SM list. (SM_PROCESSING_LIST, SM_PENDING_LIST, SM_WAITING_LIST)
*/
BOOL QUEUE_AddSMSG( MESSAGEQUEUE *queue, int list, SMSG *smsg )
{
TRACE_(sendmsg)("queue=%x, list=%d, smsg=%p msg=%s\n", queue->self, list,
smsg, SPY_GetMsgName(smsg->msg));
switch (list)
{
case SM_PROCESSING_LIST:
/* don't need to be thread safe, only accessed by the
thread associated with the sender queue */
smsg->nextProcessing = queue->smProcessing;
queue->smProcessing = smsg;
break;
case SM_WAITING_LIST:
/* don't need to be thread safe, only accessed by the
thread associated with the receiver queue */
smsg->nextWaiting = queue->smWaiting;
queue->smWaiting = smsg;
break;
case SM_PENDING_LIST:
{
/* make it thread safe, could be accessed by the sender and
receiver thread */
SMSG **prev;
EnterCriticalSection( &queue->cSection );
smsg->nextPending = NULL;
prev = &queue->smPending;
while ( *prev )
prev = &(*prev)->nextPending;
*prev = smsg;
LeaveCriticalSection( &queue->cSection );
QUEUE_SetWakeBit( queue, QS_SENDMESSAGE );
break;
}
default:
ERR_(sendmsg)("Invalid list: %d", list);
break;
}
return TRUE;
}
/***********************************************************************
* QUEUE_RemoveSMSG
*
* This routine is called when a SMSG needs to be removed from one of the three
* SM lists (SM_PROCESSING_LIST, SM_PENDING_LIST, SM_WAITING_LIST).
* If smsg == 0, remove the first smsg from the specified list
*/
SMSG *QUEUE_RemoveSMSG( MESSAGEQUEUE *queue, int list, SMSG *smsg )
{
switch (list)
{
case SM_PROCESSING_LIST:
/* don't need to be thread safe, only accessed by the
thread associated with the sender queue */
/* if smsg is equal to null, it means the first in the list */
if (!smsg)
smsg = queue->smProcessing;
TRACE_(sendmsg)("queue=%x, list=%d, smsg=%p msg=%s\n", queue->self, list,
smsg, SPY_GetMsgName(smsg->msg));
/* In fact SM_PROCESSING_LIST is a stack, and smsg
should be always at the top of the list */
if ( (smsg != queue->smProcessing) || !queue->smProcessing )
{
ERR_(sendmsg)("smsg not at the top of Processing list, smsg=0x%p queue=0x%p\n", smsg, queue);
return 0;
}
else
{
queue->smProcessing = smsg->nextProcessing;
smsg->nextProcessing = 0;
}
return smsg;
case SM_WAITING_LIST:
/* don't need to be thread safe, only accessed by the
thread associated with the receiver queue */
/* if smsg is equal to null, it means the first in the list */
if (!smsg)
smsg = queue->smWaiting;
TRACE_(sendmsg)("queue=%x, list=%d, smsg=%p msg=%s\n", queue->self, list,
smsg, SPY_GetMsgName(smsg->msg));
/* In fact SM_WAITING_LIST is a stack, and smsg
should be always at the top of the list */
if ( (smsg != queue->smWaiting) || !queue->smWaiting )
{
ERR_(sendmsg)("smsg not at the top of Waiting list, smsg=0x%p queue=0x%p\n", smsg, queue);
return 0;
}
else
{
queue->smWaiting = smsg->nextWaiting;
smsg->nextWaiting = 0;
}
return smsg;
case SM_PENDING_LIST:
/* make it thread safe, could be accessed by the sender and
receiver thread */
EnterCriticalSection( &queue->cSection );
if (!smsg)
smsg = queue->smPending;
if ( (smsg != queue->smPending) || !queue->smPending )
{
ERR_(sendmsg)("should always remove the top one in Pending list, smsg=0x%p queue=0x%p\n", smsg, queue);
LeaveCriticalSection( &queue->cSection );
return 0;
}
TRACE_(sendmsg)("queue=%x, list=%d, smsg=%p msg=%s\n", queue->self, list,
smsg, SPY_GetMsgName(smsg->msg));
queue->smPending = smsg->nextPending;
smsg->nextPending = 0;
/* if no more SMSG in Pending list, clear QS_SENDMESSAGE flag */
if (!queue->smPending)
QUEUE_ClearWakeBit( queue, QS_SENDMESSAGE );
LeaveCriticalSection( &queue->cSection );
return smsg;
default:
ERR_(sendmsg)("Invalid list: %d\n", list);
break;
}
return 0;
}
/***********************************************************************
* QUEUE_ReceiveMessage
*
* This routine is called to check whether a sent message is waiting
* for the queue. If so, it is received and processed.
*/
BOOL QUEUE_ReceiveMessage( MESSAGEQUEUE *queue )
{
LRESULT result = 0;
SMSG *smsg;
MESSAGEQUEUE *senderQ;
EnterCriticalSection( &queue->cSection );
if ( !((queue->wakeBits & QS_SENDMESSAGE) && queue->smPending) )
{
LeaveCriticalSection( &queue->cSection );
return FALSE;
}
LeaveCriticalSection( &queue->cSection );
TRACE_(sendmsg)("queue %04x\n", queue->self );
/* remove smsg on the top of the pending list and put it in the processing list */
smsg = QUEUE_RemoveSMSG(queue, SM_PENDING_LIST, 0);
QUEUE_AddSMSG(queue, SM_WAITING_LIST, smsg);
TRACE_(sendmsg)("RM: %s [%04x] (%04x -> %04x)\n",
SPY_GetMsgName(smsg->msg), smsg->msg, smsg->hSrcQueue, smsg->hDstQueue );
if (IsWindow( smsg->hWnd ))
{
WND *wndPtr = WIN_FindWndPtr( smsg->hWnd );
DWORD extraInfo = queue->GetMessageExtraInfoVal; /* save ExtraInfo */
/* use sender queue extra info value while calling the window proc */
senderQ = QUEUE_Lock( smsg->hSrcQueue );
if (senderQ)
{
queue->GetMessageExtraInfoVal = senderQ->GetMessageExtraInfoVal;
QUEUE_Unlock( senderQ );
}
/* call the right version of CallWindowProcXX */
if (smsg->flags & SMSG_WIN32)
{
TRACE_(sendmsg)("\trcm: msg is Win32\n" );
if (smsg->flags & SMSG_UNICODE)
result = CallWindowProcW( wndPtr->winproc,
smsg->hWnd, smsg->msg,
smsg->wParam, smsg->lParam );
else
result = CallWindowProcA( wndPtr->winproc,
smsg->hWnd, smsg->msg,
smsg->wParam, smsg->lParam );
}
else /* Win16 message */
result = CallWindowProc16( (WNDPROC16)wndPtr->winproc,
(HWND16) smsg->hWnd,
(UINT16) smsg->msg,
LOWORD (smsg->wParam),
smsg->lParam );
queue->GetMessageExtraInfoVal = extraInfo; /* Restore extra info */
WIN_ReleaseWndPtr(wndPtr);
TRACE_(sendmsg)("result = %08x\n", (unsigned)result );
}
else WARN_(sendmsg)("\trcm: bad hWnd\n");
/* set SMSG_SENDING_REPLY flag to tell ReplyMessage16, it's not
an early reply */
smsg->flags |= SMSG_SENDING_REPLY;
ReplyMessage( result );
TRACE_(sendmsg)("done!\n" );
return TRUE;
}
/***********************************************************************
* QUEUE_AddMsg
*
* Add a message to the queue. Return FALSE if queue is full.
*/
BOOL QUEUE_AddMsg( HQUEUE16 hQueue, int type, MSG *msg, DWORD extraInfo )
{
MESSAGEQUEUE *msgQueue;
QMSG *qmsg;
if (!(msgQueue = QUEUE_Lock( hQueue ))) return FALSE;
/* allocate new message in global heap for now */
if (!(qmsg = (QMSG *) HeapAlloc( SystemHeap, 0, sizeof(QMSG) ) ))
{
QUEUE_Unlock( msgQueue );
return 0;
}
EnterCriticalSection( &msgQueue->cSection );
/* Store message */
qmsg->type = type;
qmsg->msg = *msg;
qmsg->extraInfo = extraInfo;
/* insert the message in the link list */
qmsg->nextMsg = 0;
qmsg->prevMsg = msgQueue->lastMsg;
if (msgQueue->lastMsg)
msgQueue->lastMsg->nextMsg = qmsg;
/* update first and last anchor in message queue */
msgQueue->lastMsg = qmsg;
if (!msgQueue->firstMsg)
msgQueue->firstMsg = qmsg;
msgQueue->msgCount++;
LeaveCriticalSection( &msgQueue->cSection );
QUEUE_SetWakeBit( msgQueue, QS_POSTMESSAGE );
QUEUE_Unlock( msgQueue );
return TRUE;
}
/***********************************************************************
* QUEUE_FindMsg
*
* Find a message matching the given parameters. Return -1 if none available.
*/
QMSG* QUEUE_FindMsg( MESSAGEQUEUE * msgQueue, HWND hwnd, int first, int last )
{
QMSG* qmsg;
EnterCriticalSection( &msgQueue->cSection );
if (!msgQueue->msgCount)
qmsg = 0;
else if (!hwnd && !first && !last)
qmsg = msgQueue->firstMsg;
else
{
/* look in linked list for message matching first and last criteria */
for (qmsg = msgQueue->firstMsg; qmsg; qmsg = qmsg->nextMsg)
{
MSG *msg = &(qmsg->msg);
if (!hwnd || (msg->hwnd == hwnd))
{
if (!first && !last)
break; /* found it */
if ((msg->message >= first) && (!last || (msg->message <= last)))
break; /* found it */
}
}
}
LeaveCriticalSection( &msgQueue->cSection );
return qmsg;
}
/***********************************************************************
* QUEUE_RemoveMsg
*
* Remove a message from the queue (pos must be a valid position).
*/
void QUEUE_RemoveMsg( MESSAGEQUEUE * msgQueue, QMSG *qmsg )
{
EnterCriticalSection( &msgQueue->cSection );
/* set the linked list */
if (qmsg->prevMsg)
qmsg->prevMsg->nextMsg = qmsg->nextMsg;
if (qmsg->nextMsg)
qmsg->nextMsg->prevMsg = qmsg->prevMsg;
if (msgQueue->firstMsg == qmsg)
msgQueue->firstMsg = qmsg->nextMsg;
if (msgQueue->lastMsg == qmsg)
msgQueue->lastMsg = qmsg->prevMsg;
/* deallocate the memory for the message */
HeapFree( SystemHeap, 0, qmsg );
msgQueue->msgCount--;
if (!msgQueue->msgCount) msgQueue->wakeBits &= ~QS_POSTMESSAGE;
LeaveCriticalSection( &msgQueue->cSection );
}
/***********************************************************************
* QUEUE_WakeSomeone
*
* Wake a queue upon reception of a hardware event.
*/
static void QUEUE_WakeSomeone( UINT message )
{
WND* wndPtr = NULL;
WORD wakeBit;
HWND hwnd;
HQUEUE16 hQueue = 0;
MESSAGEQUEUE *queue = NULL;
if (hCursorQueue)
hQueue = hCursorQueue;
if( (message >= WM_KEYFIRST) && (message <= WM_KEYLAST) )
{
wakeBit = QS_KEY;
if( hActiveQueue )
hQueue = hActiveQueue;
}
else
{
wakeBit = (message == WM_MOUSEMOVE) ? QS_MOUSEMOVE : QS_MOUSEBUTTON;
if( (hwnd = GetCapture()) )
if( (wndPtr = WIN_FindWndPtr( hwnd )) )
{
hQueue = wndPtr->hmemTaskQ;
WIN_ReleaseWndPtr(wndPtr);
}
}
if( (hwnd = GetSysModalWindow16()) )
{
if( (wndPtr = WIN_FindWndPtr( hwnd )) )
{
hQueue = wndPtr->hmemTaskQ;
WIN_ReleaseWndPtr(wndPtr);
}
}
if (hQueue)
{
queue = QUEUE_Lock( hQueue );
QUEUE_SetWakeBit( queue, wakeBit );
QUEUE_Unlock( queue );
return;
}
/* Search for someone to wake */
hQueue = hFirstQueue;
while ( (queue = QUEUE_Lock( hQueue )) )
{
if (QUEUE_TrySetWakeBit( queue, wakeBit, FALSE ))
{
QUEUE_Unlock( queue );
return;
}
hQueue = queue->next;
QUEUE_Unlock( queue );
}
WARN_(msg)("couldn't find queue\n");
}
/***********************************************************************
* hardware_event
*
* Add an event to the system message queue.
* Note: the position is relative to the desktop window.
*/
void hardware_event( UINT message, WPARAM wParam, LPARAM lParam,
int xPos, int yPos, DWORD time, DWORD extraInfo )
{
MSG *msg;
QMSG *qmsg;
int mergeMsg = 0;
if (!sysMsgQueue) return;
EnterCriticalSection( &sysMsgQueue->cSection );
/* Merge with previous event if possible */
qmsg = sysMsgQueue->lastMsg;
if ((message == WM_MOUSEMOVE) && sysMsgQueue->lastMsg)
{
msg = &(sysMsgQueue->lastMsg->msg);
if ((msg->message == message) && (msg->wParam == wParam))
{
/* Merge events */
qmsg = sysMsgQueue->lastMsg;
mergeMsg = 1;
}
}
if (!mergeMsg)
{
/* Should I limit the number of messages in
the system message queue??? */
/* Don't merge allocate a new msg in the global heap */
if (!(qmsg = (QMSG *) HeapAlloc( SystemHeap, 0, sizeof(QMSG) ) ))
{
LeaveCriticalSection( &sysMsgQueue->cSection );
return;
}
/* put message at the end of the linked list */
qmsg->nextMsg = 0;
qmsg->prevMsg = sysMsgQueue->lastMsg;
if (sysMsgQueue->lastMsg)
sysMsgQueue->lastMsg->nextMsg = qmsg;
/* set last and first anchor index in system message queue */
sysMsgQueue->lastMsg = qmsg;
if (!sysMsgQueue->firstMsg)
sysMsgQueue->firstMsg = qmsg;
sysMsgQueue->msgCount++;
}
/* Store message */
msg = &(qmsg->msg);
msg->hwnd = 0;
msg->message = message;
msg->wParam = wParam;
msg->lParam = lParam;
msg->time = time;
msg->pt.x = xPos;
msg->pt.y = yPos;
qmsg->extraInfo = extraInfo;
qmsg->type = QMSG_HARDWARE;
LeaveCriticalSection( &sysMsgQueue->cSection );
QUEUE_WakeSomeone( message );
}
/***********************************************************************
* QUEUE_GetQueueTask
*/
HTASK16 QUEUE_GetQueueTask( HQUEUE16 hQueue )
{
HTASK16 hTask = 0;
MESSAGEQUEUE *queue = QUEUE_Lock( hQueue );
if (queue)
{
hTask = queue->teb->htask16;
QUEUE_Unlock( queue );
}
return hTask;
}
/***********************************************************************
* QUEUE_IncPaintCount
*/
void QUEUE_IncPaintCount( HQUEUE16 hQueue )
{
MESSAGEQUEUE *queue;
if (!(queue = QUEUE_Lock( hQueue ))) return;
EnterCriticalSection( &queue->cSection );
queue->wPaintCount++;
LeaveCriticalSection( &queue->cSection );
QUEUE_SetWakeBit( queue, QS_PAINT );
QUEUE_Unlock( queue );
}
/***********************************************************************
* QUEUE_DecPaintCount
*/
void QUEUE_DecPaintCount( HQUEUE16 hQueue )
{
MESSAGEQUEUE *queue;
if (!(queue = QUEUE_Lock( hQueue ))) return;
EnterCriticalSection( &queue->cSection );
queue->wPaintCount--;
if (!queue->wPaintCount) queue->wakeBits &= ~QS_PAINT;
LeaveCriticalSection( &queue->cSection );
QUEUE_Unlock( queue );
}
/***********************************************************************
* QUEUE_IncTimerCount
*/
void QUEUE_IncTimerCount( HQUEUE16 hQueue )
{
MESSAGEQUEUE *queue;
if (!(queue = QUEUE_Lock( hQueue ))) return;
EnterCriticalSection( &queue->cSection );
queue->wTimerCount++;
LeaveCriticalSection( &queue->cSection );
QUEUE_SetWakeBit( queue, QS_TIMER );
QUEUE_Unlock( queue );
}
/***********************************************************************
* QUEUE_DecTimerCount
*/
void QUEUE_DecTimerCount( HQUEUE16 hQueue )
{
MESSAGEQUEUE *queue;
if (!(queue = QUEUE_Lock( hQueue ))) return;
EnterCriticalSection( &queue->cSection );
queue->wTimerCount--;
if (!queue->wTimerCount) queue->wakeBits &= ~QS_TIMER;
LeaveCriticalSection( &queue->cSection );
QUEUE_Unlock( queue );
}
/***********************************************************************
* PostQuitMessage (USER.6)
*/
void WINAPI PostQuitMessage16( INT16 exitCode )
{
PostQuitMessage( exitCode );
}
/***********************************************************************
* PostQuitMessage (USER32.@)
*
* PostQuitMessage() posts a message to the system requesting an
* application to terminate execution. As a result of this function,
* the WM_QUIT message is posted to the application, and
* PostQuitMessage() returns immediately. The exitCode parameter
* specifies an application-defined exit code, which appears in the
* _wParam_ parameter of the WM_QUIT message posted to the application.
*
* CONFORMANCE
*
* ECMA-234, Win32
*/
void WINAPI PostQuitMessage( INT exitCode )
{
MESSAGEQUEUE *queue;
if (!(queue = QUEUE_Lock( GetFastQueue16() ))) return;
EnterCriticalSection( &queue->cSection );
queue->wPostQMsg = TRUE;
queue->wExitCode = (WORD)exitCode;
LeaveCriticalSection( &queue->cSection );
QUEUE_Unlock( queue );
}
/***********************************************************************
* GetWindowTask (USER.224)
*/
HTASK16 WINAPI GetWindowTask16( HWND16 hwnd )
{
HTASK16 retvalue;
WND *wndPtr = WIN_FindWndPtr( hwnd );
if (!wndPtr) return 0;
retvalue = QUEUE_GetQueueTask( wndPtr->hmemTaskQ );
WIN_ReleaseWndPtr(wndPtr);
return retvalue;
}
/***********************************************************************
* GetWindowThreadProcessId (USER32.@)
*/
DWORD WINAPI GetWindowThreadProcessId( HWND hwnd, LPDWORD process )
{
DWORD retvalue;
MESSAGEQUEUE *queue;
WND *wndPtr = WIN_FindWndPtr( hwnd );
if (!wndPtr) return 0;
queue = QUEUE_Lock( wndPtr->hmemTaskQ );
WIN_ReleaseWndPtr(wndPtr);
if (!queue) return 0;
if ( process ) *process = (DWORD)queue->teb->pid;
retvalue = (DWORD)queue->teb->tid;
QUEUE_Unlock( queue );
return retvalue;
}
/***********************************************************************
* SetMessageQueue (USER.266)
*/
BOOL16 WINAPI SetMessageQueue16( INT16 size )
{
return SetMessageQueue( size );
}
/***********************************************************************
* SetMessageQueue (USER32.@)
*/
BOOL WINAPI SetMessageQueue( INT size )
{
/* now obsolete the message queue will be expanded dynamically
as necessary */
/* access the queue to create it if it's not existing */
GetFastQueue16();
return TRUE;
}
/***********************************************************************
* InitThreadInput (USER.409)
*/
HQUEUE16 WINAPI InitThreadInput16( WORD unknown, WORD flags )
{
HQUEUE16 hQueue;
MESSAGEQUEUE *queuePtr;
TEB *teb = NtCurrentTeb();
if (!teb)
return 0;
hQueue = teb->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( SystemHeap ); /* FIXME: a bit overkill */
SetThreadQueue16( 0, hQueue );
teb->queue = hQueue;
queuePtr->next = hFirstQueue;
hFirstQueue = hQueue;
HeapUnlock( SystemHeap );
QUEUE_Unlock( queuePtr );
}
return hQueue;
}
/***********************************************************************
* GetQueueStatus (USER.334)
*/
DWORD WINAPI GetQueueStatus16( UINT16 flags )
{
MESSAGEQUEUE *queue;
DWORD ret;
if (!(queue = QUEUE_Lock( GetFastQueue16() ))) return 0;
EnterCriticalSection( &queue->cSection );
ret = MAKELONG( queue->changeBits, queue->wakeBits );
queue->changeBits = 0;
LeaveCriticalSection( &queue->cSection );
QUEUE_Unlock( queue );
return ret & MAKELONG( flags, flags );
}
/***********************************************************************
* GetQueueStatus (USER32.@)
*/
DWORD WINAPI GetQueueStatus( UINT flags )
{
MESSAGEQUEUE *queue;
DWORD ret;
if (!(queue = QUEUE_Lock( GetFastQueue16() ))) return 0;
EnterCriticalSection( &queue->cSection );
ret = MAKELONG( queue->changeBits, queue->wakeBits );
queue->changeBits = 0;
LeaveCriticalSection( &queue->cSection );
QUEUE_Unlock( queue );
return ret & MAKELONG( flags, flags );
}
/***********************************************************************
* GetInputState (USER.335)
*/
BOOL16 WINAPI GetInputState16(void)
{
return GetInputState();
}
/***********************************************************************
* WaitForInputIdle (USER32.@)
*/
DWORD WINAPI WaitForInputIdle (HANDLE hProcess, DWORD dwTimeOut)
{
DWORD cur_time, ret;
HANDLE idle_event = -1;
SERVER_START_REQ
{
struct wait_input_idle_request *req = server_alloc_req( sizeof(*req), 0 );
req->handle = hProcess;
req->timeout = dwTimeOut;
if (!(ret = server_call( REQ_WAIT_INPUT_IDLE ))) idle_event = req->event;
}
SERVER_END_REQ;
if (ret) return 0xffffffff; /* error */
if (!idle_event) return 0; /* no event to wait on */
cur_time = GetTickCount();
TRACE_(msg)("waiting for %x\n", idle_event );
while ( dwTimeOut > GetTickCount() - cur_time || dwTimeOut == INFINITE )
{
ret = MsgWaitForMultipleObjects ( 1, &idle_event, FALSE, dwTimeOut, QS_SENDMESSAGE );
if ( ret == ( WAIT_OBJECT_0 + 1 ))
{
MESSAGEQUEUE * queue;
if (!(queue = QUEUE_Lock( GetFastQueue16() ))) return 0xFFFFFFFF;
QUEUE_ReceiveMessage ( queue );
QUEUE_Unlock ( queue );
continue;
}
if ( ret == WAIT_TIMEOUT || ret == 0xFFFFFFFF )
{
TRACE_(msg)("timeout or error\n");
return ret;
}
else
{
TRACE_(msg)("finished\n");
return 0;
}
}
return WAIT_TIMEOUT;
}
/***********************************************************************
* GetInputState (USER32.@)
*/
BOOL WINAPI GetInputState(void)
{
MESSAGEQUEUE *queue;
BOOL ret;
if (!(queue = QUEUE_Lock( GetFastQueue16() )))
return FALSE;
EnterCriticalSection( &queue->cSection );
ret = queue->wakeBits & (QS_KEY | QS_MOUSEBUTTON);
LeaveCriticalSection( &queue->cSection );
QUEUE_Unlock( queue );
return ret;
}
/***********************************************************************
* UserYield (USER.332)
* UserYield16 (USER32.@)
*/
void WINAPI UserYield16(void)
{
MESSAGEQUEUE *queue;
/* Handle sent messages */
queue = QUEUE_Lock( GetFastQueue16() );
while ( queue && QUEUE_ReceiveMessage( queue ) )
;
QUEUE_Unlock( queue );
/* Yield */
if ( THREAD_IsWin16( NtCurrentTeb() ) )
OldYield16();
else
WIN32_OldYield16();
/* Handle sent messages again */
queue = QUEUE_Lock( GetFastQueue16() );
while ( queue && QUEUE_ReceiveMessage( queue ) )
;
QUEUE_Unlock( queue );
}
/***********************************************************************
* GetMessagePos (USER.119) (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;
DWORD ret;
if (!(queue = QUEUE_Lock( GetFastQueue16() ))) return 0;
ret = queue->GetMessagePosVal;
QUEUE_Unlock( queue );
return ret;
}
/***********************************************************************
* GetMessageTime (USER.120) (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;
LONG ret;
if (!(queue = QUEUE_Lock( GetFastQueue16() ))) return 0;
ret = queue->GetMessageTimeVal;
QUEUE_Unlock( queue );
return ret;
}
/***********************************************************************
* GetMessageExtraInfo (USER.288) (USER32.@)
*/
LONG WINAPI GetMessageExtraInfo(void)
{
MESSAGEQUEUE *queue;
LONG ret;
if (!(queue = QUEUE_Lock( GetFastQueue16() ))) return 0;
ret = queue->GetMessageExtraInfoVal;
QUEUE_Unlock( queue );
return ret;
}
/**********************************************************************
* 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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