windows/queue.c

   1 /*
   2  * Message queues related functions
   3  *
   4  * Copyright 1993, 1994 Alexandre Julliard
   5  */
   6
   7 #include <stdlib.h>
   8 #include <signal.h>
   9 #include "miscemu.h"
  10 #include "module.h"
  11 #include "queue.h"
  12 #include "task.h"
  13 #include "win.h"
  14 #include "clipboard.h"
  15 #include "hook.h"
  16 #include "heap.h"
  17 #include "thread.h"
  18 #include "process.h"
  19 #include "debug.h"
  20
  21 #define MAX_QUEUE_SIZE   120  /* Max. size of a message queue */
  22
  23 static HQUEUE16 hFirstQueue = 0;
  24 static HQUEUE16 hExitingQueue = 0;
  25 static HQUEUE16 hmemSysMsgQueue = 0;
  26 static MESSAGEQUEUE *sysMsgQueue = NULL;
  27
  28 static MESSAGEQUEUE *pMouseQueue = NULL;  /* Queue for last mouse message */
  29 static MESSAGEQUEUE *pKbdQueue = NULL;    /* Queue for last kbd message */
  30
  31 MESSAGEQUEUE *pCursorQueue = NULL;
  32 MESSAGEQUEUE *pActiveQueue = NULL;
  33
  34 /***********************************************************************
  35  *           QUEUE_DumpQueue
  36  */
  37 void QUEUE_DumpQueue( HQUEUE16 hQueue )
  38 {
  39     MESSAGEQUEUE *pq;
  40
  41     if (!(pq = (MESSAGEQUEUE*) GlobalLock16( hQueue )) ||
  42         GlobalSize16(hQueue) < sizeof(MESSAGEQUEUE)+pq->queueSize*sizeof(QMSG))
  43     {
  44         WARN(msg, "%04x is not a queue handle\n", hQueue );
  45         return;
  46     }
  47
  48     DUMP(    "next: %12.4x  Intertask SendMessage:\n"
  49              "hTask: %11.4x  ----------------------\n"
  50              "msgSize: %9.4x  hWnd: %10.4x\n"
  51              "msgCount: %8.4x  msg: %11.4x\n"
  52              "msgNext: %9.4x  wParam: %8.4x\n"
  53              "msgFree: %9.4x  lParam: %8.8x\n"
  54              "qSize: %11.4x  lRet: %10.8x\n"
  55              "wWinVer: %9.4x  ISMH: %10.4x\n"
  56              "paints: %10.4x  hSendTask: %5.4x\n"
  57              "timers: %10.4x  hPrevSend: %5.4x\n"
  58              "wakeBits: %8.4x\n"
  59              "wakeMask: %8.4x\n"
  60              "hCurHook: %8.4x\n",
  61              pq->next, pq->hTask, pq->msgSize, pq->hWnd,
  62              pq->msgCount, pq->msg, pq->nextMessage, pq->wParam,
  63              pq->nextFreeMessage, (unsigned)pq->lParam, pq->queueSize,
  64              (unsigned)pq->SendMessageReturn, pq->wWinVersion, pq->InSendMessageHandle,
  65              pq->wPaintCount, pq->hSendingTask, pq->wTimerCount,
  66              pq->hPrevSendingTask, pq->wakeBits, pq->wakeMask, pq->hCurHook);
  67 }
  68
  69
  70 /***********************************************************************
  71  *           QUEUE_WalkQueues
  72  */
  73 void QUEUE_WalkQueues(void)
  74 {
  75     char module[10];
  76     HQUEUE16 hQueue = hFirstQueue;
  77
  78     DUMP( "Queue Size Msgs Task\n" );
  79     while (hQueue)
  80     {
  81         MESSAGEQUEUE *queue = (MESSAGEQUEUE *)GlobalLock16( hQueue );
  82         if (!queue)
  83         {
  84             WARN( msg, "Bad queue handle %04x\n", hQueue );
  85             return;
  86         }
  87         if (!GetModuleName( queue->hTask, module, sizeof(module )))
  88             strcpy( module, "???" );
  89         DUMP( "%04x %5d %4d %04x %s\n", hQueue, queue->msgSize,
  90                  queue->msgCount, queue->hTask, module );
  91         hQueue = queue->next;
  92     }
  93     DUMP( "\n" );
  94 }
  95
  96
  97 /***********************************************************************
  98  *           QUEUE_IsExitingQueue
  99  */
 100 BOOL32 QUEUE_IsExitingQueue( HQUEUE16 hQueue )
 101 {
 102     return (hExitingQueue && (hQueue == hExitingQueue));
 103 }
 104
 105
 106 /***********************************************************************
 107  *           QUEUE_SetExitingQueue
 108  */
 109 void QUEUE_SetExitingQueue( HQUEUE16 hQueue )
 110 {
 111     hExitingQueue = hQueue;
 112 }
 113
 114
 115 /***********************************************************************
 116  *           QUEUE_CreateMsgQueue
 117  *
 118  * Creates a message queue. Doesn't link it into queue list!
 119  */
 120 static HQUEUE16 QUEUE_CreateMsgQueue( int size )
 121 {
 122     HQUEUE16 hQueue;
 123     MESSAGEQUEUE * msgQueue;
 124     int queueSize;
 125     TDB *pTask = (TDB *)GlobalLock16( GetCurrentTask() );
 126
 127     TRACE(msg,"Creating message queue...\n");
 128
 129     queueSize = sizeof(MESSAGEQUEUE) + size * sizeof(QMSG);
 130     if (!(hQueue = GlobalAlloc16( GMEM_FIXED | GMEM_ZEROINIT, queueSize )))
 131         return 0;
 132     msgQueue = (MESSAGEQUEUE *) GlobalLock16( hQueue );
 133     msgQueue->self        = hQueue;
 134     msgQueue->msgSize     = sizeof(QMSG);
 135     msgQueue->queueSize   = size;
 136     msgQueue->wakeBits    = msgQueue->changeBits = QS_SMPARAMSFREE;
 137     msgQueue->wWinVersion = pTask ? pTask->version : 0;
 138     GlobalUnlock16( hQueue );
 139     return hQueue;
 140 }
 141
 142
 143 /***********************************************************************
 144  *           QUEUE_DeleteMsgQueue
 145  *
 146  * Unlinks and deletes a message queue.
 147  *
 148  * Note: We need to mask asynchronous events to make sure PostMessage works
 149  * even in the signal handler.
 150  */
 151 BOOL32 QUEUE_DeleteMsgQueue( HQUEUE16 hQueue )
 152 {
 153     MESSAGEQUEUE * msgQueue = (MESSAGEQUEUE*)GlobalLock16(hQueue);
 154     HQUEUE16  senderQ;
 155     HQUEUE16 *pPrev;
 156
 157     TRACE(msg,"Deleting message queue %04x\n", hQueue);
 158
 159     if (!hQueue || !msgQueue)
 160     {
 161         WARN(msg, "invalid argument.\n");
 162         return 0;
 163     }
 164     if( pCursorQueue == msgQueue ) pCursorQueue = NULL;
 165     if( pActiveQueue == msgQueue ) pActiveQueue = NULL;
 166
 167     /* flush sent messages */
 168     senderQ = msgQueue->hSendingTask;
 169     while( senderQ )
 170     {
 171       MESSAGEQUEUE* sq = (MESSAGEQUEUE*)GlobalLock16(senderQ);
 172       if( !sq ) break;
 173       sq->SendMessageReturn = 0L;
 174       QUEUE_SetWakeBit( sq, QS_SMRESULT );
 175       senderQ = sq->hPrevSendingTask;
 176     }
 177
 178     SIGNAL_MaskAsyncEvents( TRUE );
 179
 180     pPrev = &hFirstQueue;
 181     while (*pPrev && (*pPrev != hQueue))
 182     {
 183         MESSAGEQUEUE *msgQ = (MESSAGEQUEUE*)GlobalLock16(*pPrev);
 184         pPrev = &msgQ->next;
 185     }
 186     if (*pPrev) *pPrev = msgQueue->next;
 187     msgQueue->self = 0;
 188
 189     SIGNAL_MaskAsyncEvents( FALSE );
 190
 191     GlobalFree16( hQueue );
 192     return 1;
 193 }
 194
 195
 196 /***********************************************************************
 197  *           QUEUE_CreateSysMsgQueue
 198  *
 199  * Create the system message queue, and set the double-click speed.
 200  * Must be called only once.
 201  */
 202 BOOL32 QUEUE_CreateSysMsgQueue( int size )
 203 {
 204     if (size > MAX_QUEUE_SIZE) size = MAX_QUEUE_SIZE;
 205     else if (size <= 0) size = 1;
 206     if (!(hmemSysMsgQueue = QUEUE_CreateMsgQueue( size ))) return FALSE;
 207     sysMsgQueue = (MESSAGEQUEUE *) GlobalLock16( hmemSysMsgQueue );
 208     return TRUE;
 209 }
 210
 211
 212 /***********************************************************************
 213  *           QUEUE_GetSysQueue
 214  */
 215 MESSAGEQUEUE *QUEUE_GetSysQueue(void)
 216 {
 217     return sysMsgQueue;
 218 }
 219
 220 /***********************************************************************
 221  *           QUEUE_Signal
 222  */
 223 void QUEUE_Signal( HTASK16 hTask )
 224 {
 225     PDB32 *pdb;
 226     THREAD_ENTRY *entry;
 227     int wakeup = FALSE;
 228
 229     TDB *pTask = (TDB *)GlobalLock16( hTask );
 230     if ( !pTask ) return;
 231
 232     TRACE(msg, "calling SYNC_MsgWakeUp\n");
 233
 234     /* Wake up thread waiting for message */
 235     /* NOTE: This should really wake up *the* thread that owns
 236              the queue. Since we dont't have thread-local message
 237              queues yet, we wake up all waiting threads ... */
 238     SYSTEM_LOCK();
 239     pdb = pTask->thdb->process;
 240     entry = pdb? pdb->thread_list->next : NULL;
 241
 242     if (entry)
 243         for (;;)
 244         {
 245             if (entry->thread->wait_struct.wait_msg)
 246             {
 247                 SYNC_MsgWakeUp( entry->thread );
 248                 wakeup = TRUE;
 249             }
 250             if (entry == pdb->thread_list) break;
 251             entry = entry->next;
 252         }
 253     SYSTEM_UNLOCK();
 254
 255 /*    if ( !wakeup )*/
 256         PostEvent( hTask );
 257 }
 258
 259 /***********************************************************************
 260  *           QUEUE_Wait
 261  */
 262 void QUEUE_Wait( void )
 263 {
 264     if ( THREAD_IsWin16( THREAD_Current() ) )
 265         WaitEvent( 0 );
 266     else
 267     {
 268         TRACE(msg, "current task is 32-bit, calling SYNC_DoWait\n");
 269         SYNC_DoWait( 0, NULL, FALSE, INFINITE32, FALSE, TRUE );
 270     }
 271 }
 272
 273
 274 /***********************************************************************
 275  *           QUEUE_SetWakeBit
 276  *
 277  * See "Windows Internals", p.449
 278  */
 279 void QUEUE_SetWakeBit( MESSAGEQUEUE *queue, WORD bit )
 280 {
 281     TRACE(msg,"queue = %04x (wm=%04x), bit = %04x\n",
 282                         queue->self, queue->wakeMask, bit );
 283
 284     if (bit & QS_MOUSE) pMouseQueue = queue;
 285     if (bit & QS_KEY) pKbdQueue = queue;
 286     queue->changeBits |= bit;
 287     queue->wakeBits   |= bit;
 288     if (queue->wakeMask & bit)
 289     {
 290         queue->wakeMask = 0;
 291         QUEUE_Signal( queue->hTask );
 292     }
 293 }
 294
 295
 296 /***********************************************************************
 297  *           QUEUE_ClearWakeBit
 298  */
 299 void QUEUE_ClearWakeBit( MESSAGEQUEUE *queue, WORD bit )
 300 {
 301     queue->changeBits &= ~bit;
 302     queue->wakeBits   &= ~bit;
 303 }
 304
 305
 306 /***********************************************************************
 307  *           QUEUE_WaitBits
 308  *
 309  * See "Windows Internals", p.447
 310  */
 311 void QUEUE_WaitBits( WORD bits )
 312 {
 313     MESSAGEQUEUE *queue;
 314
 315     TRACE(msg,"q %04x waiting for %04x\n", GetTaskQueue(0), bits);
 316
 317     for (;;)
 318     {
 319         if (!(queue = (MESSAGEQUEUE *)GlobalLock16( GetTaskQueue(0) ))) return;
 320
 321         if (queue->changeBits & bits)
 322         {
 323             /* One of the bits is set; we can return */
 324             queue->wakeMask = 0;
 325             return;
 326         }
 327         if (queue->wakeBits & QS_SENDMESSAGE)
 328         {
 329             /* Process the sent message immediately */
 330
 331             queue->wakeMask = 0;
 332             QUEUE_ReceiveMessage( queue );
 333             continue;                           /* nested sm crux */
 334         }
 335
 336         queue->wakeMask = bits | QS_SENDMESSAGE;
 337         if(queue->changeBits & bits) continue;
 338
 339         TRACE(msg,"%04x) wakeMask is %04x, waiting\n", queue->self, queue->wakeMask);
 340
 341         QUEUE_Wait();
 342     }
 343 }
 344
 345
 346 /***********************************************************************
 347  *           QUEUE_ReceiveMessage
 348  *
 349  * This routine is called when a sent message is waiting for the queue.
 350  */
 351 void QUEUE_ReceiveMessage( MESSAGEQUEUE *queue )
 352 {
 353     MESSAGEQUEUE *senderQ = NULL;
 354     HQUEUE16      prevSender = 0;
 355     QSMCTRL*      prevCtrlPtr = NULL;
 356     LRESULT       result = 0;
 357
 358     TRACE(msg, "ReceiveMessage, queue %04x\n", queue->self );
 359     if (!(queue->wakeBits & QS_SENDMESSAGE) ||
 360         !(senderQ = (MESSAGEQUEUE*)GlobalLock16( queue->hSendingTask)))
 361         { TRACE(msg,"\trcm: nothing to do\n"); return; }
 362
 363     if( !senderQ->hPrevSendingTask )
 364         QUEUE_ClearWakeBit( queue, QS_SENDMESSAGE );   /* no more sent messages */
 365
 366     /* Save current state on stack */
 367     prevSender                 = queue->InSendMessageHandle;
 368     prevCtrlPtr                = queue->smResultCurrent;
 369
 370     /* Remove sending queue from the list */
 371     queue->InSendMessageHandle = queue->hSendingTask;
 372     queue->smResultCurrent     = senderQ->smResultInit;
 373     queue->hSendingTask        = senderQ->hPrevSendingTask;
 374
 375     TRACE(msg, "\trcm: smResultCurrent = %08x, prevCtrl = %08x\n",
 376                                 (unsigned)queue->smResultCurrent, (unsigned)prevCtrlPtr );
 377     QUEUE_SetWakeBit( senderQ, QS_SMPARAMSFREE );
 378
 379     TRACE(msg, "\trcm: calling wndproc - %04x %04x %04x%04x %08x\n",
 380                 senderQ->hWnd, senderQ->msg, senderQ->wParamHigh,
 381                 senderQ->wParam, (unsigned)senderQ->lParam );
 382
 383     if (IsWindow32( senderQ->hWnd ))
 384     {
 385         WND *wndPtr = WIN_FindWndPtr( senderQ->hWnd );
 386         DWORD extraInfo = queue->GetMessageExtraInfoVal;
 387         queue->GetMessageExtraInfoVal = senderQ->GetMessageExtraInfoVal;
 388
 389         if (senderQ->flags & QUEUE_SM_WIN32)
 390         {
 391             WPARAM32 wParam = MAKELONG( senderQ->wParam, senderQ->wParamHigh );
 392             TRACE(msg, "\trcm: msg is Win32\n" );
 393             if (senderQ->flags & QUEUE_SM_UNICODE)
 394                 result = CallWindowProc32W( wndPtr->winproc,
 395                                             senderQ->hWnd, senderQ->msg,
 396                                             wParam, senderQ->lParam );
 397             else
 398                 result = CallWindowProc32A( wndPtr->winproc,
 399                                             senderQ->hWnd, senderQ->msg,
 400                                             wParam, senderQ->lParam );
 401         }
 402         else  /* Win16 message */
 403             result = CallWindowProc16( (WNDPROC16)wndPtr->winproc,
 404                                        senderQ->hWnd, senderQ->msg,
 405                                        senderQ->wParam, senderQ->lParam );
 406
 407         queue->GetMessageExtraInfoVal = extraInfo;  /* Restore extra info */
 408         TRACE(msg,"\trcm: result =  %08x\n", (unsigned)result );
 409     }
 410     else WARN(msg, "\trcm: bad hWnd\n");
 411
 412     /* Return the result to the sender task */
 413     ReplyMessage16( result );
 414
 415     queue->InSendMessageHandle = prevSender;
 416     queue->smResultCurrent     = prevCtrlPtr;
 417
 418     TRACE(msg,"done!\n");
 419 }
 420
 421 /***********************************************************************
 422  *           QUEUE_FlushMessage
 423  *
 424  * Try to reply to all pending sent messages on exit.
 425  */
 426 void QUEUE_FlushMessages( HQUEUE16 hQueue )
 427 {
 428   MESSAGEQUEUE *queue = (MESSAGEQUEUE*)GlobalLock16( hQueue );
 429
 430   if( queue )
 431   {
 432     MESSAGEQUEUE *senderQ = (MESSAGEQUEUE*)GlobalLock16( queue->hSendingTask);
 433     QSMCTRL*      CtrlPtr = queue->smResultCurrent;
 434
 435     TRACE(msg,"Flushing queue %04x:\n", hQueue );
 436
 437     while( senderQ )
 438     {
 439       if( !CtrlPtr )
 440            CtrlPtr = senderQ->smResultInit;
 441
 442       TRACE(msg,"\tfrom queue %04x, smResult %08x\n", queue->hSendingTask, (unsigned)CtrlPtr );
 443
 444       if( !(queue->hSendingTask = senderQ->hPrevSendingTask) )
 445         QUEUE_ClearWakeBit( queue, QS_SENDMESSAGE );
 446
 447       QUEUE_SetWakeBit( senderQ, QS_SMPARAMSFREE );
 448
 449       queue->smResultCurrent = CtrlPtr;
 450       while( senderQ->wakeBits & QS_SMRESULT ) OldYield();
 451
 452       senderQ->SendMessageReturn = 0;
 453       senderQ->smResult = queue->smResultCurrent;
 454       QUEUE_SetWakeBit( senderQ, QS_SMRESULT);
 455
 456       senderQ = (MESSAGEQUEUE*)GlobalLock16( queue->hSendingTask);
 457       CtrlPtr = NULL;
 458     }
 459     queue->InSendMessageHandle = 0;
 460   }
 461 }
 462
 463 /***********************************************************************
 464  *           QUEUE_AddMsg
 465  *
 466  * Add a message to the queue. Return FALSE if queue is full.
 467  */
 468 BOOL32 QUEUE_AddMsg( HQUEUE16 hQueue, MSG16 * msg, DWORD extraInfo )
 469 {
 470     int pos;
 471     MESSAGEQUEUE *msgQueue;
 472
 473     SIGNAL_MaskAsyncEvents( TRUE );
 474
 475     if (!(msgQueue = (MESSAGEQUEUE *)GlobalLock16( hQueue ))) return FALSE;
 476     pos = msgQueue->nextFreeMessage;
 477
 478       /* Check if queue is full */
 479     if ((pos == msgQueue->nextMessage) && (msgQueue->msgCount > 0))
 480     {
 481         SIGNAL_MaskAsyncEvents( FALSE );
 482         WARN( msg,"Queue is full!\n" );
 483         return FALSE;
 484     }
 485
 486       /* Store message */
 487     msgQueue->messages[pos].msg = *msg;
 488     msgQueue->messages[pos].extraInfo = extraInfo;
 489     if (pos < msgQueue->queueSize-1) pos++;
 490     else pos = 0;
 491     msgQueue->nextFreeMessage = pos;
 492     msgQueue->msgCount++;
 493
 494     SIGNAL_MaskAsyncEvents( FALSE );
 495
 496     QUEUE_SetWakeBit( msgQueue, QS_POSTMESSAGE );
 497     return TRUE;
 498 }
 499
 500
 501 /***********************************************************************
 502  *           QUEUE_FindMsg
 503  *
 504  * Find a message matching the given parameters. Return -1 if none available.
 505  */
 506 int QUEUE_FindMsg( MESSAGEQUEUE * msgQueue, HWND32 hwnd, int first, int last )
 507 {
 508     int i, pos = msgQueue->nextMessage;
 509
 510     TRACE(msg,"hwnd=%04x pos=%d\n", hwnd, pos );
 511
 512     if (!msgQueue->msgCount) return -1;
 513     if (!hwnd && !first && !last) return pos;
 514
 515     for (i = 0; i < msgQueue->msgCount; i++)
 516     {
 517         MSG16 * msg = &msgQueue->messages[pos].msg;
 518
 519         if (!hwnd || (msg->hwnd == hwnd))
 520         {
 521             if (!first && !last) return pos;
 522             if ((msg->message >= first) && (msg->message <= last)) return pos;
 523         }
 524         if (pos < msgQueue->queueSize-1) pos++;
 525         else pos = 0;
 526     }
 527     return -1;
 528 }
 529
 530
 531 /***********************************************************************
 532  *           QUEUE_RemoveMsg
 533  *
 534  * Remove a message from the queue (pos must be a valid position).
 535  */
 536 void QUEUE_RemoveMsg( MESSAGEQUEUE * msgQueue, int pos )
 537 {
 538     SIGNAL_MaskAsyncEvents( TRUE );
 539
 540     if (pos >= msgQueue->nextMessage)
 541     {
 542         for ( ; pos > msgQueue->nextMessage; pos--)
 543             msgQueue->messages[pos] = msgQueue->messages[pos-1];
 544         msgQueue->nextMessage++;
 545         if (msgQueue->nextMessage >= msgQueue->queueSize)
 546             msgQueue->nextMessage = 0;
 547     }
 548     else
 549     {
 550         for ( ; pos < msgQueue->nextFreeMessage; pos++)
 551             msgQueue->messages[pos] = msgQueue->messages[pos+1];
 552         if (msgQueue->nextFreeMessage) msgQueue->nextFreeMessage--;
 553         else msgQueue->nextFreeMessage = msgQueue->queueSize-1;
 554     }
 555     msgQueue->msgCount--;
 556     if (!msgQueue->msgCount) msgQueue->wakeBits &= ~QS_POSTMESSAGE;
 557
 558     SIGNAL_MaskAsyncEvents( FALSE );
 559 }
 560
 561
 562 /***********************************************************************
 563  *           QUEUE_WakeSomeone
 564  *
 565  * Wake a queue upon reception of a hardware event.
 566  */
 567 static void QUEUE_WakeSomeone( UINT32 message )
 568 {
 569     WND*          wndPtr = NULL;
 570     WORD          wakeBit;
 571     HWND32 hwnd;
 572     MESSAGEQUEUE *queue = pCursorQueue;
 573
 574     if( (message >= WM_KEYFIRST) && (message <= WM_KEYLAST) )
 575     {
 576        wakeBit = QS_KEY;
 577        if( pActiveQueue ) queue = pActiveQueue;
 578     }
 579     else
 580     {
 581        wakeBit = (message == WM_MOUSEMOVE) ? QS_MOUSEMOVE : QS_MOUSEBUTTON;
 582        if( (hwnd = GetCapture32()) )
 583          if( (wndPtr = WIN_FindWndPtr( hwnd )) )
 584            queue = (MESSAGEQUEUE *)GlobalLock16( wndPtr->hmemTaskQ );
 585     }
 586
 587     if( (hwnd = GetSysModalWindow16()) )
 588       if( (wndPtr = WIN_FindWndPtr( hwnd )) )
 589         queue = (MESSAGEQUEUE *)GlobalLock16( wndPtr->hmemTaskQ );
 590
 591     if( !queue )
 592     {
 593       queue = GlobalLock16( hFirstQueue );
 594       while( queue )
 595       {
 596         if (queue->wakeMask & wakeBit) break;
 597         queue = GlobalLock16( queue->next );
 598       }
 599       if( !queue )
 600       {
 601         WARN(msg, "couldn't find queue\n");
 602         return;
 603       }
 604     }
 605
 606     QUEUE_SetWakeBit( queue, wakeBit );
 607 }
 608
 609
 610 /***********************************************************************
 611  *           hardware_event
 612  *
 613  * Add an event to the system message queue.
 614  * Note: the position is relative to the desktop window.
 615  */
 616 void hardware_event( WORD message, WORD wParam, LONG lParam,
 617                      int xPos, int yPos, DWORD time, DWORD extraInfo )
 618 {
 619     MSG16 *msg;
 620     int pos;
 621
 622     if (!sysMsgQueue) return;
 623     pos = sysMsgQueue->nextFreeMessage;
 624
 625       /* Merge with previous event if possible */
 626
 627     if ((message == WM_MOUSEMOVE) && sysMsgQueue->msgCount)
 628     {
 629         if (pos > 0) pos--;
 630         else pos = sysMsgQueue->queueSize - 1;
 631         msg = &sysMsgQueue->messages[pos].msg;
 632         if ((msg->message == message) && (msg->wParam == wParam))
 633             sysMsgQueue->msgCount--;  /* Merge events */
 634         else
 635             pos = sysMsgQueue->nextFreeMessage;  /* Don't merge */
 636     }
 637
 638       /* Check if queue is full */
 639
 640     if ((pos == sysMsgQueue->nextMessage) && sysMsgQueue->msgCount)
 641     {
 642         /* Queue is full, beep (but not on every mouse motion...) */
 643         if (message != WM_MOUSEMOVE) MessageBeep32(0);
 644         return;
 645     }
 646
 647       /* Store message */
 648
 649     msg = &sysMsgQueue->messages[pos].msg;
 650     msg->hwnd    = 0;
 651     msg->message = message;
 652     msg->wParam  = wParam;
 653     msg->lParam  = lParam;
 654     msg->time    = time;
 655     msg->pt.x    = xPos & 0xffff;
 656     msg->pt.y    = yPos & 0xffff;
 657     sysMsgQueue->messages[pos].extraInfo = extraInfo;
 658     if (pos < sysMsgQueue->queueSize - 1) pos++;
 659     else pos = 0;
 660     sysMsgQueue->nextFreeMessage = pos;
 661     sysMsgQueue->msgCount++;
 662     QUEUE_WakeSomeone( message );
 663 }
 664
 665
 666 /***********************************************************************
 667  *           QUEUE_GetQueueTask
 668  */
 669 HTASK16 QUEUE_GetQueueTask( HQUEUE16 hQueue )
 670 {
 671     MESSAGEQUEUE *queue = GlobalLock16( hQueue );
 672     return (queue) ? queue->hTask : 0 ;
 673 }
 674
 675
 676 /***********************************************************************
 677  *           QUEUE_IncPaintCount
 678  */
 679 void QUEUE_IncPaintCount( HQUEUE16 hQueue )
 680 {
 681     MESSAGEQUEUE *queue;
 682
 683     if (!(queue = (MESSAGEQUEUE *)GlobalLock16( hQueue ))) return;
 684     queue->wPaintCount++;
 685     QUEUE_SetWakeBit( queue, QS_PAINT );
 686 }
 687
 688
 689 /***********************************************************************
 690  *           QUEUE_DecPaintCount
 691  */
 692 void QUEUE_DecPaintCount( HQUEUE16 hQueue )
 693 {
 694     MESSAGEQUEUE *queue;
 695
 696     if (!(queue = (MESSAGEQUEUE *)GlobalLock16( hQueue ))) return;
 697     queue->wPaintCount--;
 698     if (!queue->wPaintCount) queue->wakeBits &= ~QS_PAINT;
 699 }
 700
 701
 702 /***********************************************************************
 703  *           QUEUE_IncTimerCount
 704  */
 705 void QUEUE_IncTimerCount( HQUEUE16 hQueue )
 706 {
 707     MESSAGEQUEUE *queue;
 708
 709     if (!(queue = (MESSAGEQUEUE *)GlobalLock16( hQueue ))) return;
 710     queue->wTimerCount++;
 711     QUEUE_SetWakeBit( queue, QS_TIMER );
 712 }
 713
 714
 715 /***********************************************************************
 716  *           QUEUE_DecTimerCount
 717  */
 718 void QUEUE_DecTimerCount( HQUEUE16 hQueue )
 719 {
 720     MESSAGEQUEUE *queue;
 721
 722     if (!(queue = (MESSAGEQUEUE *)GlobalLock16( hQueue ))) return;
 723     queue->wTimerCount--;
 724     if (!queue->wTimerCount) queue->wakeBits &= ~QS_TIMER;
 725 }
 726
 727
 728 /***********************************************************************
 729  *           PostQuitMessage16   (USER.6)
 730  */
 731 void WINAPI PostQuitMessage16( INT16 exitCode )
 732 {
 733     PostQuitMessage32( exitCode );
 734 }
 735
 736
 737 /***********************************************************************
 738  *           PostQuitMessage32   (USER32.421)
 739  *
 740  * PostQuitMessage() posts a message to the system requesting an
 741  * application to terminate execution. As a result of this function,
 742  * the WM_QUIT message is posted to the application, and
 743  * PostQuitMessage() returns immediately.  The exitCode parameter
 744  * specifies an application-defined exit code, which appears in the
 745  * _wParam_ parameter of the WM_QUIT message posted to the application.
 746  *
 747  * CONFORMANCE
 748  *
 749  *  ECMA-234, Win32
 750  */
 751 void WINAPI PostQuitMessage32( INT32 exitCode )
 752 {
 753     MESSAGEQUEUE *queue;
 754
 755     if (!(queue = (MESSAGEQUEUE *)GlobalLock16( GetTaskQueue(0) ))) return;
 756     queue->wPostQMsg = TRUE;
 757     queue->wExitCode = (WORD)exitCode;
 758 }
 759
 760
 761 /***********************************************************************
 762  *           GetWindowTask16   (USER.224)
 763  */
 764 HTASK16 WINAPI GetWindowTask16( HWND16 hwnd )
 765 {
 766     WND *wndPtr = WIN_FindWndPtr( hwnd );
 767
 768     if (!wndPtr) return 0;
 769     return QUEUE_GetQueueTask( wndPtr->hmemTaskQ );
 770 }
 771
 772 /***********************************************************************
 773  *           GetWindowThreadProcessId   (USER32.313)
 774  */
 775 DWORD WINAPI GetWindowThreadProcessId( HWND32 hwnd, LPDWORD process )
 776 {
 777     HTASK16 htask;
 778     TDB *tdb;
 779
 780     WND *wndPtr = WIN_FindWndPtr( hwnd );
 781
 782     if (!wndPtr) return 0;
 783     htask=QUEUE_GetQueueTask( wndPtr->hmemTaskQ );
 784     tdb = (TDB*)GlobalLock16(htask);
 785     if (!tdb || !tdb->thdb) return 0;
 786     if (process) *process = PDB_TO_PROCESS_ID( tdb->thdb->process );
 787     return THDB_TO_THREAD_ID( tdb->thdb );
 788 }
 789
 790
 791 /***********************************************************************
 792  *           SetMessageQueue16   (USER.266)
 793  */
 794 BOOL16 WINAPI SetMessageQueue16( INT16 size )
 795 {
 796     return SetMessageQueue32( size );
 797 }
 798
 799
 800 /***********************************************************************
 801  *           SetMessageQueue32   (USER32.494)
 802  */
 803 BOOL32 WINAPI SetMessageQueue32( INT32 size )
 804 {
 805     HQUEUE16 hQueue, hNewQueue;
 806     MESSAGEQUEUE *queuePtr;
 807
 808     TRACE(msg,"task %04x size %i\n", GetCurrentTask(), size);
 809
 810     if ((size > MAX_QUEUE_SIZE) || (size <= 0)) return FALSE;
 811
 812     if( !(hNewQueue = QUEUE_CreateMsgQueue( size )))
 813     {
 814         WARN(msg, "failed!\n");
 815         return FALSE;
 816     }
 817     queuePtr = (MESSAGEQUEUE *)GlobalLock16( hNewQueue );
 818
 819     SIGNAL_MaskAsyncEvents( TRUE );
 820
 821     /* Copy data and free the old message queue */
 822     if ((hQueue = GetTaskQueue(0)) != 0)
 823     {
 824        MESSAGEQUEUE *oldQ = (MESSAGEQUEUE *)GlobalLock16( hQueue );
 825        memcpy( &queuePtr->wParamHigh, &oldQ->wParamHigh,
 826                         (int)oldQ->messages - (int)(&oldQ->wParamHigh) );
 827        HOOK_ResetQueueHooks( hNewQueue );
 828        if( WIN_GetDesktop()->hmemTaskQ == hQueue )
 829            WIN_GetDesktop()->hmemTaskQ = hNewQueue;
 830        WIN_ResetQueueWindows( WIN_GetDesktop(), hQueue, hNewQueue );
 831        CLIPBOARD_ResetLock( hQueue, hNewQueue );
 832        QUEUE_DeleteMsgQueue( hQueue );
 833     }
 834
 835     /* Link new queue into list */
 836     queuePtr->hTask = GetCurrentTask();
 837     queuePtr->next  = hFirstQueue;
 838     hFirstQueue = hNewQueue;
 839
 840     if( !queuePtr->next ) pCursorQueue = queuePtr;
 841     SetTaskQueue( 0, hNewQueue );
 842
 843     SIGNAL_MaskAsyncEvents( FALSE );
 844     return TRUE;
 845 }
 846
 847
 848 /***********************************************************************
 849  *           GetQueueStatus16   (USER.334)
 850  */
 851 DWORD WINAPI GetQueueStatus16( UINT16 flags )
 852 {
 853     MESSAGEQUEUE *queue;
 854     DWORD ret;
 855
 856     if (!(queue = (MESSAGEQUEUE *)GlobalLock16( GetTaskQueue(0) ))) return 0;
 857     ret = MAKELONG( queue->changeBits, queue->wakeBits );
 858     queue->changeBits = 0;
 859     return ret & MAKELONG( flags, flags );
 860 }
 861
 862 /***********************************************************************
 863  *           GetQueueStatus32   (USER32.283)
 864  */
 865 DWORD WINAPI GetQueueStatus32( UINT32 flags )
 866 {
 867     MESSAGEQUEUE *queue;
 868     DWORD ret;
 869
 870     if (!(queue = (MESSAGEQUEUE *)GlobalLock16( GetTaskQueue(0) ))) return 0;
 871     ret = MAKELONG( queue->changeBits, queue->wakeBits );
 872     queue->changeBits = 0;
 873     return ret & MAKELONG( flags, flags );
 874 }
 875
 876
 877 /***********************************************************************
 878  *           GetInputState16   (USER.335)
 879  */
 880 BOOL16 WINAPI GetInputState16(void)
 881 {
 882     return GetInputState32();
 883 }
 884
 885 /***********************************************************************
 886  *           WaitForInputIdle   (USER32.577)
 887  */
 888 DWORD WINAPI WaitForInputIdle (HANDLE32 hProcess, DWORD dwTimeOut)
 889 {
 890   FIXME (msg, "(hProcess=%d, dwTimeOut=%ld): stub\n", hProcess, dwTimeOut);
 891
 892   return WAIT_TIMEOUT;
 893 }
 894
 895
 896 /***********************************************************************
 897  *           GetInputState32   (USER32.244)
 898  */
 899 BOOL32 WINAPI GetInputState32(void)
 900 {
 901     MESSAGEQUEUE *queue;
 902
 903     if (!(queue = (MESSAGEQUEUE *)GlobalLock16( GetTaskQueue(0) )))
 904         return FALSE;
 905     return queue->wakeBits & (QS_KEY | QS_MOUSEBUTTON);
 906 }
 907
 908
 909 /***********************************************************************
 910  *           GetMessagePos   (USER.119) (USER32.272)
 911  *
 912  * The GetMessagePos() function returns a long value representing a
 913  * cursor position, in screen coordinates, when the last message
 914  * retrieved by the GetMessage() function occurs. The x-coordinate is
 915  * in the low-order word of the return value, the y-coordinate is in
 916  * the high-order word. The application can use the MAKEPOINT()
 917  * macro to obtain a POINT structure from the return value.
 918  *
 919  * For the current cursor position, use GetCursorPos().
 920  *
 921  * RETURNS
 922  *
 923  * Cursor position of last message on success, zero on failure.
 924  *
 925  * CONFORMANCE
 926  *
 927  * ECMA-234, Win32
 928  *
 929  */
 930 DWORD WINAPI GetMessagePos(void)
 931 {
 932     MESSAGEQUEUE *queue;
 933
 934     if (!(queue = (MESSAGEQUEUE *)GlobalLock16( GetTaskQueue(0) ))) return 0;
 935     return queue->GetMessagePosVal;
 936 }
 937
 938
 939 /***********************************************************************
 940  *           GetMessageTime   (USER.120) (USER32.273)
 941  *
 942  * GetMessageTime() returns the message time for the last message
 943  * retrieved by the function. The time is measured in milliseconds with
 944  * the same offset as GetTickCount().
 945  *
 946  * Since the tick count wraps, this is only useful for moderately short
 947  * relative time comparisons.
 948  *
 949  * RETURNS
 950  *
 951  * Time of last message on success, zero on failure.
 952  *
 953  * CONFORMANCE
 954  *
 955  * ECMA-234, Win32
 956  *
 957  */
 958 LONG WINAPI GetMessageTime(void)
 959 {
 960     MESSAGEQUEUE *queue;
 961
 962     if (!(queue = (MESSAGEQUEUE *)GlobalLock16( GetTaskQueue(0) ))) return 0;
 963     return queue->GetMessageTimeVal;
 964 }
 965
 966
 967 /***********************************************************************
 968  *           GetMessageExtraInfo   (USER.288) (USER32.271)
 969  */
 970 LONG WINAPI GetMessageExtraInfo(void)
 971 {
 972     MESSAGEQUEUE *queue;
 973
 974     if (!(queue = (MESSAGEQUEUE *)GlobalLock16( GetTaskQueue(0) ))) return 0;
 975     return queue->GetMessageExtraInfoVal;
 976 }