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 #if 0
 239     /* FIXME: should be replaced by a server event */
 240     SYSTEM_LOCK();
 241     pdb = pTask->thdb->process;
 242     entry = pdb? pdb->thread_list->next : NULL;
 243
 244     if (entry)
 245         for (;;)
 246         {
 247             if (entry->thread->wait_struct.wait_msg)
 248             {
 249                 SYNC_MsgWakeUp( entry->thread );
 250                 wakeup = TRUE;
 251             }
 252             if (entry == pdb->thread_list) break;
 253             entry = entry->next;
 254         }
 255     SYSTEM_UNLOCK();
 256 #endif
 257
 258 /*    if ( !wakeup )*/
 259         PostEvent( hTask );
 260 }
 261
 262 /***********************************************************************
 263  *           QUEUE_Wait
 264  */
 265 void QUEUE_Wait( void )
 266 {
 267     if ( THREAD_IsWin16( THREAD_Current() ) )
 268         WaitEvent( 0 );
 269     else
 270     {
 271         TRACE(msg, "current task is 32-bit, calling SYNC_DoWait\n");
 272         SYNC_DoWait( 0, NULL, FALSE, INFINITE32, FALSE, TRUE );
 273     }
 274 }
 275
 276
 277 /***********************************************************************
 278  *           QUEUE_SetWakeBit
 279  *
 280  * See "Windows Internals", p.449
 281  */
 282 void QUEUE_SetWakeBit( MESSAGEQUEUE *queue, WORD bit )
 283 {
 284     TRACE(msg,"queue = %04x (wm=%04x), bit = %04x\n",
 285                         queue->self, queue->wakeMask, bit );
 286
 287     if (bit & QS_MOUSE) pMouseQueue = queue;
 288     if (bit & QS_KEY) pKbdQueue = queue;
 289     queue->changeBits |= bit;
 290     queue->wakeBits   |= bit;
 291     if (queue->wakeMask & bit)
 292     {
 293         queue->wakeMask = 0;
 294         QUEUE_Signal( queue->hTask );
 295     }
 296 }
 297
 298
 299 /***********************************************************************
 300  *           QUEUE_ClearWakeBit
 301  */
 302 void QUEUE_ClearWakeBit( MESSAGEQUEUE *queue, WORD bit )
 303 {
 304     queue->changeBits &= ~bit;
 305     queue->wakeBits   &= ~bit;
 306 }
 307
 308
 309 /***********************************************************************
 310  *           QUEUE_WaitBits
 311  *
 312  * See "Windows Internals", p.447
 313  */
 314 void QUEUE_WaitBits( WORD bits )
 315 {
 316     MESSAGEQUEUE *queue;
 317
 318     TRACE(msg,"q %04x waiting for %04x\n", GetFastQueue(), bits);
 319
 320     for (;;)
 321     {
 322         if (!(queue = (MESSAGEQUEUE *)GlobalLock16( GetFastQueue() ))) return;
 323
 324         if (queue->changeBits & bits)
 325         {
 326             /* One of the bits is set; we can return */
 327             queue->wakeMask = 0;
 328             return;
 329         }
 330         if (queue->wakeBits & QS_SENDMESSAGE)
 331         {
 332             /* Process the sent message immediately */
 333
 334             queue->wakeMask = 0;
 335             QUEUE_ReceiveMessage( queue );
 336             continue;                           /* nested sm crux */
 337         }
 338
 339         queue->wakeMask = bits | QS_SENDMESSAGE;
 340         if(queue->changeBits & bits) continue;
 341
 342         TRACE(msg,"%04x) wakeMask is %04x, waiting\n", queue->self, queue->wakeMask);
 343
 344         QUEUE_Wait();
 345     }
 346 }
 347
 348
 349 /***********************************************************************
 350  *           QUEUE_ReceiveMessage
 351  *
 352  * This routine is called when a sent message is waiting for the queue.
 353  */
 354 void QUEUE_ReceiveMessage( MESSAGEQUEUE *queue )
 355 {
 356     MESSAGEQUEUE *senderQ = NULL;
 357     HQUEUE16      prevSender = 0;
 358     QSMCTRL*      prevCtrlPtr = NULL;
 359     LRESULT       result = 0;
 360
 361     TRACE(msg, "ReceiveMessage, queue %04x\n", queue->self );
 362     if (!(queue->wakeBits & QS_SENDMESSAGE) ||
 363         !(senderQ = (MESSAGEQUEUE*)GlobalLock16( queue->hSendingTask)))
 364         { TRACE(msg,"\trcm: nothing to do\n"); return; }
 365
 366     if( !senderQ->hPrevSendingTask )
 367         QUEUE_ClearWakeBit( queue, QS_SENDMESSAGE );   /* no more sent messages */
 368
 369     /* Save current state on stack */
 370     prevSender                 = queue->InSendMessageHandle;
 371     prevCtrlPtr                = queue->smResultCurrent;
 372
 373     /* Remove sending queue from the list */
 374     queue->InSendMessageHandle = queue->hSendingTask;
 375     queue->smResultCurrent     = senderQ->smResultInit;
 376     queue->hSendingTask        = senderQ->hPrevSendingTask;
 377
 378     TRACE(msg, "\trcm: smResultCurrent = %08x, prevCtrl = %08x\n",
 379                                 (unsigned)queue->smResultCurrent, (unsigned)prevCtrlPtr );
 380     QUEUE_SetWakeBit( senderQ, QS_SMPARAMSFREE );
 381
 382     TRACE(msg, "\trcm: calling wndproc - %04x %04x %04x%04x %08x\n",
 383                 senderQ->hWnd, senderQ->msg, senderQ->wParamHigh,
 384                 senderQ->wParam, (unsigned)senderQ->lParam );
 385
 386     if (IsWindow32( senderQ->hWnd ))
 387     {
 388         WND *wndPtr = WIN_FindWndPtr( senderQ->hWnd );
 389         DWORD extraInfo = queue->GetMessageExtraInfoVal;
 390         queue->GetMessageExtraInfoVal = senderQ->GetMessageExtraInfoVal;
 391
 392         if (senderQ->flags & QUEUE_SM_WIN32)
 393         {
 394             WPARAM32 wParam = MAKELONG( senderQ->wParam, senderQ->wParamHigh );
 395             TRACE(msg, "\trcm: msg is Win32\n" );
 396             if (senderQ->flags & QUEUE_SM_UNICODE)
 397                 result = CallWindowProc32W( wndPtr->winproc,
 398                                             senderQ->hWnd, senderQ->msg,
 399                                             wParam, senderQ->lParam );
 400             else
 401                 result = CallWindowProc32A( wndPtr->winproc,
 402                                             senderQ->hWnd, senderQ->msg,
 403                                             wParam, senderQ->lParam );
 404         }
 405         else  /* Win16 message */
 406             result = CallWindowProc16( (WNDPROC16)wndPtr->winproc,
 407                                        senderQ->hWnd, senderQ->msg,
 408                                        senderQ->wParam, senderQ->lParam );
 409
 410         queue->GetMessageExtraInfoVal = extraInfo;  /* Restore extra info */
 411         TRACE(msg,"\trcm: result =  %08x\n", (unsigned)result );
 412     }
 413     else WARN(msg, "\trcm: bad hWnd\n");
 414
 415     /* Return the result to the sender task */
 416     ReplyMessage16( result );
 417
 418     queue->InSendMessageHandle = prevSender;
 419     queue->smResultCurrent     = prevCtrlPtr;
 420
 421     TRACE(msg,"done!\n");
 422 }
 423
 424 /***********************************************************************
 425  *           QUEUE_FlushMessage
 426  *
 427  * Try to reply to all pending sent messages on exit.
 428  */
 429 void QUEUE_FlushMessages( HQUEUE16 hQueue )
 430 {
 431   MESSAGEQUEUE *queue = (MESSAGEQUEUE*)GlobalLock16( hQueue );
 432
 433   if( queue )
 434   {
 435     MESSAGEQUEUE *senderQ = (MESSAGEQUEUE*)GlobalLock16( queue->hSendingTask);
 436     QSMCTRL*      CtrlPtr = queue->smResultCurrent;
 437
 438     TRACE(msg,"Flushing queue %04x:\n", hQueue );
 439
 440     while( senderQ )
 441     {
 442       if( !CtrlPtr )
 443            CtrlPtr = senderQ->smResultInit;
 444
 445       TRACE(msg,"\tfrom queue %04x, smResult %08x\n", queue->hSendingTask, (unsigned)CtrlPtr );
 446
 447       if( !(queue->hSendingTask = senderQ->hPrevSendingTask) )
 448         QUEUE_ClearWakeBit( queue, QS_SENDMESSAGE );
 449
 450       QUEUE_SetWakeBit( senderQ, QS_SMPARAMSFREE );
 451
 452       queue->smResultCurrent = CtrlPtr;
 453       while( senderQ->wakeBits & QS_SMRESULT ) OldYield();
 454
 455       senderQ->SendMessageReturn = 0;
 456       senderQ->smResult = queue->smResultCurrent;
 457       QUEUE_SetWakeBit( senderQ, QS_SMRESULT);
 458
 459       senderQ = (MESSAGEQUEUE*)GlobalLock16( queue->hSendingTask);
 460       CtrlPtr = NULL;
 461     }
 462     queue->InSendMessageHandle = 0;
 463   }
 464 }
 465
 466 /***********************************************************************
 467  *           QUEUE_AddMsg
 468  *
 469  * Add a message to the queue. Return FALSE if queue is full.
 470  */
 471 BOOL32 QUEUE_AddMsg( HQUEUE16 hQueue, MSG16 * msg, DWORD extraInfo )
 472 {
 473     int pos;
 474     MESSAGEQUEUE *msgQueue;
 475
 476     SIGNAL_MaskAsyncEvents( TRUE );
 477
 478     if (!(msgQueue = (MESSAGEQUEUE *)GlobalLock16( hQueue ))) return FALSE;
 479     pos = msgQueue->nextFreeMessage;
 480
 481       /* Check if queue is full */
 482     if ((pos == msgQueue->nextMessage) && (msgQueue->msgCount > 0))
 483     {
 484         SIGNAL_MaskAsyncEvents( FALSE );
 485         WARN( msg,"Queue is full!\n" );
 486         return FALSE;
 487     }
 488
 489       /* Store message */
 490     msgQueue->messages[pos].msg = *msg;
 491     msgQueue->messages[pos].extraInfo = extraInfo;
 492     if (pos < msgQueue->queueSize-1) pos++;
 493     else pos = 0;
 494     msgQueue->nextFreeMessage = pos;
 495     msgQueue->msgCount++;
 496
 497     SIGNAL_MaskAsyncEvents( FALSE );
 498
 499     QUEUE_SetWakeBit( msgQueue, QS_POSTMESSAGE );
 500     return TRUE;
 501 }
 502
 503
 504 /***********************************************************************
 505  *           QUEUE_FindMsg
 506  *
 507  * Find a message matching the given parameters. Return -1 if none available.
 508  */
 509 int QUEUE_FindMsg( MESSAGEQUEUE * msgQueue, HWND32 hwnd, int first, int last )
 510 {
 511     int i, pos = msgQueue->nextMessage;
 512
 513     TRACE(msg,"hwnd=%04x pos=%d\n", hwnd, pos );
 514
 515     if (!msgQueue->msgCount) return -1;
 516     if (!hwnd && !first && !last) return pos;
 517
 518     for (i = 0; i < msgQueue->msgCount; i++)
 519     {
 520         MSG16 * msg = &msgQueue->messages[pos].msg;
 521
 522         if (!hwnd || (msg->hwnd == hwnd))
 523         {
 524             if (!first && !last) return pos;
 525             if ((msg->message >= first) && (msg->message <= last)) return pos;
 526         }
 527         if (pos < msgQueue->queueSize-1) pos++;
 528         else pos = 0;
 529     }
 530     return -1;
 531 }
 532
 533
 534 /***********************************************************************
 535  *           QUEUE_RemoveMsg
 536  *
 537  * Remove a message from the queue (pos must be a valid position).
 538  */
 539 void QUEUE_RemoveMsg( MESSAGEQUEUE * msgQueue, int pos )
 540 {
 541     SIGNAL_MaskAsyncEvents( TRUE );
 542
 543     if (pos >= msgQueue->nextMessage)
 544     {
 545         for ( ; pos > msgQueue->nextMessage; pos--)
 546             msgQueue->messages[pos] = msgQueue->messages[pos-1];
 547         msgQueue->nextMessage++;
 548         if (msgQueue->nextMessage >= msgQueue->queueSize)
 549             msgQueue->nextMessage = 0;
 550     }
 551     else
 552     {
 553         for ( ; pos < msgQueue->nextFreeMessage; pos++)
 554             msgQueue->messages[pos] = msgQueue->messages[pos+1];
 555         if (msgQueue->nextFreeMessage) msgQueue->nextFreeMessage--;
 556         else msgQueue->nextFreeMessage = msgQueue->queueSize-1;
 557     }
 558     msgQueue->msgCount--;
 559     if (!msgQueue->msgCount) msgQueue->wakeBits &= ~QS_POSTMESSAGE;
 560
 561     SIGNAL_MaskAsyncEvents( FALSE );
 562 }
 563
 564
 565 /***********************************************************************
 566  *           QUEUE_WakeSomeone
 567  *
 568  * Wake a queue upon reception of a hardware event.
 569  */
 570 static void QUEUE_WakeSomeone( UINT32 message )
 571 {
 572     WND*          wndPtr = NULL;
 573     WORD          wakeBit;
 574     HWND32 hwnd;
 575     MESSAGEQUEUE *queue = pCursorQueue;
 576
 577     if( (message >= WM_KEYFIRST) && (message <= WM_KEYLAST) )
 578     {
 579        wakeBit = QS_KEY;
 580        if( pActiveQueue ) queue = pActiveQueue;
 581     }
 582     else
 583     {
 584        wakeBit = (message == WM_MOUSEMOVE) ? QS_MOUSEMOVE : QS_MOUSEBUTTON;
 585        if( (hwnd = GetCapture32()) )
 586          if( (wndPtr = WIN_FindWndPtr( hwnd )) )
 587            queue = (MESSAGEQUEUE *)GlobalLock16( wndPtr->hmemTaskQ );
 588     }
 589
 590     if( (hwnd = GetSysModalWindow16()) )
 591       if( (wndPtr = WIN_FindWndPtr( hwnd )) )
 592         queue = (MESSAGEQUEUE *)GlobalLock16( wndPtr->hmemTaskQ );
 593
 594     if( !queue )
 595     {
 596       queue = GlobalLock16( hFirstQueue );
 597       while( queue )
 598       {
 599         if (queue->wakeMask & wakeBit) break;
 600         queue = GlobalLock16( queue->next );
 601       }
 602       if( !queue )
 603       {
 604         WARN(msg, "couldn't find queue\n");
 605         return;
 606       }
 607     }
 608
 609     QUEUE_SetWakeBit( queue, wakeBit );
 610 }
 611
 612
 613 /***********************************************************************
 614  *           hardware_event
 615  *
 616  * Add an event to the system message queue.
 617  * Note: the position is relative to the desktop window.
 618  */
 619 void hardware_event( WORD message, WORD wParam, LONG lParam,
 620                      int xPos, int yPos, DWORD time, DWORD extraInfo )
 621 {
 622     MSG16 *msg;
 623     int pos;
 624
 625     if (!sysMsgQueue) return;
 626     pos = sysMsgQueue->nextFreeMessage;
 627
 628       /* Merge with previous event if possible */
 629
 630     if ((message == WM_MOUSEMOVE) && sysMsgQueue->msgCount)
 631     {
 632         if (pos > 0) pos--;
 633         else pos = sysMsgQueue->queueSize - 1;
 634         msg = &sysMsgQueue->messages[pos].msg;
 635         if ((msg->message == message) && (msg->wParam == wParam))
 636             sysMsgQueue->msgCount--;  /* Merge events */
 637         else
 638             pos = sysMsgQueue->nextFreeMessage;  /* Don't merge */
 639     }
 640
 641       /* Check if queue is full */
 642
 643     if ((pos == sysMsgQueue->nextMessage) && sysMsgQueue->msgCount)
 644     {
 645         /* Queue is full, beep (but not on every mouse motion...) */
 646         if (message != WM_MOUSEMOVE) MessageBeep32(0);
 647         return;
 648     }
 649
 650       /* Store message */
 651
 652     msg = &sysMsgQueue->messages[pos].msg;
 653     msg->hwnd    = 0;
 654     msg->message = message;
 655     msg->wParam  = wParam;
 656     msg->lParam  = lParam;
 657     msg->time    = time;
 658     msg->pt.x    = xPos & 0xffff;
 659     msg->pt.y    = yPos & 0xffff;
 660     sysMsgQueue->messages[pos].extraInfo = extraInfo;
 661     if (pos < sysMsgQueue->queueSize - 1) pos++;
 662     else pos = 0;
 663     sysMsgQueue->nextFreeMessage = pos;
 664     sysMsgQueue->msgCount++;
 665     QUEUE_WakeSomeone( message );
 666 }
 667
 668
 669 /***********************************************************************
 670  *           QUEUE_GetQueueTask
 671  */
 672 HTASK16 QUEUE_GetQueueTask( HQUEUE16 hQueue )
 673 {
 674     MESSAGEQUEUE *queue = GlobalLock16( hQueue );
 675     return (queue) ? queue->hTask : 0 ;
 676 }
 677
 678
 679 /***********************************************************************
 680  *           QUEUE_IncPaintCount
 681  */
 682 void QUEUE_IncPaintCount( HQUEUE16 hQueue )
 683 {
 684     MESSAGEQUEUE *queue;
 685
 686     if (!(queue = (MESSAGEQUEUE *)GlobalLock16( hQueue ))) return;
 687     queue->wPaintCount++;
 688     QUEUE_SetWakeBit( queue, QS_PAINT );
 689 }
 690
 691
 692 /***********************************************************************
 693  *           QUEUE_DecPaintCount
 694  */
 695 void QUEUE_DecPaintCount( HQUEUE16 hQueue )
 696 {
 697     MESSAGEQUEUE *queue;
 698
 699     if (!(queue = (MESSAGEQUEUE *)GlobalLock16( hQueue ))) return;
 700     queue->wPaintCount--;
 701     if (!queue->wPaintCount) queue->wakeBits &= ~QS_PAINT;
 702 }
 703
 704
 705 /***********************************************************************
 706  *           QUEUE_IncTimerCount
 707  */
 708 void QUEUE_IncTimerCount( HQUEUE16 hQueue )
 709 {
 710     MESSAGEQUEUE *queue;
 711
 712     if (!(queue = (MESSAGEQUEUE *)GlobalLock16( hQueue ))) return;
 713     queue->wTimerCount++;
 714     QUEUE_SetWakeBit( queue, QS_TIMER );
 715 }
 716
 717
 718 /***********************************************************************
 719  *           QUEUE_DecTimerCount
 720  */
 721 void QUEUE_DecTimerCount( HQUEUE16 hQueue )
 722 {
 723     MESSAGEQUEUE *queue;
 724
 725     if (!(queue = (MESSAGEQUEUE *)GlobalLock16( hQueue ))) return;
 726     queue->wTimerCount--;
 727     if (!queue->wTimerCount) queue->wakeBits &= ~QS_TIMER;
 728 }
 729
 730
 731 /***********************************************************************
 732  *           PostQuitMessage16   (USER.6)
 733  */
 734 void WINAPI PostQuitMessage16( INT16 exitCode )
 735 {
 736     PostQuitMessage32( exitCode );
 737 }
 738
 739
 740 /***********************************************************************
 741  *           PostQuitMessage32   (USER32.421)
 742  *
 743  * PostQuitMessage() posts a message to the system requesting an
 744  * application to terminate execution. As a result of this function,
 745  * the WM_QUIT message is posted to the application, and
 746  * PostQuitMessage() returns immediately.  The exitCode parameter
 747  * specifies an application-defined exit code, which appears in the
 748  * _wParam_ parameter of the WM_QUIT message posted to the application.
 749  *
 750  * CONFORMANCE
 751  *
 752  *  ECMA-234, Win32
 753  */
 754 void WINAPI PostQuitMessage32( INT32 exitCode )
 755 {
 756     MESSAGEQUEUE *queue;
 757
 758     if (!(queue = (MESSAGEQUEUE *)GlobalLock16( GetFastQueue() ))) return;
 759     queue->wPostQMsg = TRUE;
 760     queue->wExitCode = (WORD)exitCode;
 761 }
 762
 763
 764 /***********************************************************************
 765  *           GetWindowTask16   (USER.224)
 766  */
 767 HTASK16 WINAPI GetWindowTask16( HWND16 hwnd )
 768 {
 769     WND *wndPtr = WIN_FindWndPtr( hwnd );
 770
 771     if (!wndPtr) return 0;
 772     return QUEUE_GetQueueTask( wndPtr->hmemTaskQ );
 773 }
 774
 775 /***********************************************************************
 776  *           GetWindowThreadProcessId   (USER32.313)
 777  */
 778 DWORD WINAPI GetWindowThreadProcessId( HWND32 hwnd, LPDWORD process )
 779 {
 780     HTASK16 htask;
 781     TDB *tdb;
 782
 783     WND *wndPtr = WIN_FindWndPtr( hwnd );
 784
 785     if (!wndPtr) return 0;
 786     htask=QUEUE_GetQueueTask( wndPtr->hmemTaskQ );
 787     tdb = (TDB*)GlobalLock16(htask);
 788     if (!tdb || !tdb->thdb) return 0;
 789     if (process) *process = PDB_TO_PROCESS_ID( tdb->thdb->process );
 790     return THDB_TO_THREAD_ID( tdb->thdb );
 791 }
 792
 793
 794 /***********************************************************************
 795  *           SetMessageQueue16   (USER.266)
 796  */
 797 BOOL16 WINAPI SetMessageQueue16( INT16 size )
 798 {
 799     return SetMessageQueue32( size );
 800 }
 801
 802
 803 /***********************************************************************
 804  *           SetMessageQueue32   (USER32.494)
 805  */
 806 BOOL32 WINAPI SetMessageQueue32( INT32 size )
 807 {
 808     HQUEUE16 hQueue, hNewQueue;
 809     MESSAGEQUEUE *queuePtr;
 810
 811     TRACE(msg,"task %04x size %i\n", GetCurrentTask(), size);
 812
 813     if ((size > MAX_QUEUE_SIZE) || (size <= 0)) return FALSE;
 814
 815     if( !(hNewQueue = QUEUE_CreateMsgQueue( size )))
 816     {
 817         WARN(msg, "failed!\n");
 818         return FALSE;
 819     }
 820     queuePtr = (MESSAGEQUEUE *)GlobalLock16( hNewQueue );
 821
 822     SIGNAL_MaskAsyncEvents( TRUE );
 823
 824     /* Copy data and free the old message queue */
 825     if ((hQueue = GetThreadQueue(0)) != 0)
 826     {
 827        MESSAGEQUEUE *oldQ = (MESSAGEQUEUE *)GlobalLock16( hQueue );
 828        memcpy( &queuePtr->wParamHigh, &oldQ->wParamHigh,
 829                         (int)oldQ->messages - (int)(&oldQ->wParamHigh) );
 830        HOOK_ResetQueueHooks( hNewQueue );
 831        if( WIN_GetDesktop()->hmemTaskQ == hQueue )
 832            WIN_GetDesktop()->hmemTaskQ = hNewQueue;
 833        WIN_ResetQueueWindows( WIN_GetDesktop(), hQueue, hNewQueue );
 834        CLIPBOARD_ResetLock( hQueue, hNewQueue );
 835        QUEUE_DeleteMsgQueue( hQueue );
 836     }
 837
 838     /* Link new queue into list */
 839     queuePtr->hTask = GetCurrentTask();
 840     queuePtr->next  = hFirstQueue;
 841     hFirstQueue = hNewQueue;
 842
 843     if( !queuePtr->next ) pCursorQueue = queuePtr;
 844     SetThreadQueue( 0, hNewQueue );
 845
 846     SIGNAL_MaskAsyncEvents( FALSE );
 847     return TRUE;
 848 }
 849
 850 /***********************************************************************
 851  *           InitThreadInput   (USER.409)
 852  */
 853 HQUEUE16 WINAPI InitThreadInput( WORD unknown, WORD flags )
 854 {
 855     HQUEUE16 hQueue = GetTaskQueue( 0 );
 856
 857     FIXME( msg, "(%04X,%04X): should create thread-local message queue!\n",
 858                 unknown, flags );
 859
 860     SetFastQueue( 0, hQueue );
 861     return hQueue;
 862 }
 863
 864 /***********************************************************************
 865  *           GetQueueStatus16   (USER.334)
 866  */
 867 DWORD WINAPI GetQueueStatus16( UINT16 flags )
 868 {
 869     MESSAGEQUEUE *queue;
 870     DWORD ret;
 871
 872     if (!(queue = (MESSAGEQUEUE *)GlobalLock16( GetFastQueue() ))) return 0;
 873     ret = MAKELONG( queue->changeBits, queue->wakeBits );
 874     queue->changeBits = 0;
 875     return ret & MAKELONG( flags, flags );
 876 }
 877
 878 /***********************************************************************
 879  *           GetQueueStatus32   (USER32.283)
 880  */
 881 DWORD WINAPI GetQueueStatus32( UINT32 flags )
 882 {
 883     MESSAGEQUEUE *queue;
 884     DWORD ret;
 885
 886     if (!(queue = (MESSAGEQUEUE *)GlobalLock16( GetFastQueue() ))) return 0;
 887     ret = MAKELONG( queue->changeBits, queue->wakeBits );
 888     queue->changeBits = 0;
 889     return ret & MAKELONG( flags, flags );
 890 }
 891
 892
 893 /***********************************************************************
 894  *           GetInputState16   (USER.335)
 895  */
 896 BOOL16 WINAPI GetInputState16(void)
 897 {
 898     return GetInputState32();
 899 }
 900
 901 /***********************************************************************
 902  *           WaitForInputIdle   (USER32.577)
 903  */
 904 DWORD WINAPI WaitForInputIdle (HANDLE32 hProcess, DWORD dwTimeOut)
 905 {
 906   FIXME (msg, "(hProcess=%d, dwTimeOut=%ld): stub\n", hProcess, dwTimeOut);
 907
 908   return WAIT_TIMEOUT;
 909 }
 910
 911
 912 /***********************************************************************
 913  *           GetInputState32   (USER32.244)
 914  */
 915 BOOL32 WINAPI GetInputState32(void)
 916 {
 917     MESSAGEQUEUE *queue;
 918
 919     if (!(queue = (MESSAGEQUEUE *)GlobalLock16( GetFastQueue() )))
 920         return FALSE;
 921     return queue->wakeBits & (QS_KEY | QS_MOUSEBUTTON);
 922 }
 923
 924 /***********************************************************************
 925  *           UserYield  (USER.332)
 926  */
 927 void WINAPI UserYield(void)
 928 {
 929     TDB *pCurTask = (TDB *)GlobalLock16( GetCurrentTask() );
 930     MESSAGEQUEUE *queue = (MESSAGEQUEUE *)GlobalLock16( pCurTask->hQueue );
 931
 932     if ( !THREAD_IsWin16( THREAD_Current() ) )
 933     {
 934         FIXME(task, "called for Win32 thread (%04x)!\n", THREAD_Current()->teb_sel);
 935         return;
 936     }
 937
 938     /* Handle sent messages */
 939     while (queue && (queue->wakeBits & QS_SENDMESSAGE))
 940         QUEUE_ReceiveMessage( queue );
 941
 942     OldYield();
 943
 944     queue = (MESSAGEQUEUE *)GlobalLock16( pCurTask->hQueue );
 945     while (queue && (queue->wakeBits & QS_SENDMESSAGE))
 946         QUEUE_ReceiveMessage( queue );
 947 }
 948
 949 /***********************************************************************
 950  *           GetMessagePos   (USER.119) (USER32.272)
 951  *
 952  * The GetMessagePos() function returns a long value representing a
 953  * cursor position, in screen coordinates, when the last message
 954  * retrieved by the GetMessage() function occurs. The x-coordinate is
 955  * in the low-order word of the return value, the y-coordinate is in
 956  * the high-order word. The application can use the MAKEPOINT()
 957  * macro to obtain a POINT structure from the return value.
 958  *
 959  * For the current cursor position, use GetCursorPos().
 960  *
 961  * RETURNS
 962  *
 963  * Cursor position of last message on success, zero on failure.
 964  *
 965  * CONFORMANCE
 966  *
 967  * ECMA-234, Win32
 968  *
 969  */
 970 DWORD WINAPI GetMessagePos(void)
 971 {
 972     MESSAGEQUEUE *queue;
 973
 974     if (!(queue = (MESSAGEQUEUE *)GlobalLock16( GetFastQueue() ))) return 0;
 975     return queue->GetMessagePosVal;
 976 }
 977
 978
 979 /***********************************************************************
 980  *           GetMessageTime   (USER.120) (USER32.273)
 981  *
 982  * GetMessageTime() returns the message time for the last message
 983  * retrieved by the function. The time is measured in milliseconds with
 984  * the same offset as GetTickCount().
 985  *
 986  * Since the tick count wraps, this is only useful for moderately short
 987  * relative time comparisons.
 988  *
 989  * RETURNS
 990  *
 991  * Time of last message on success, zero on failure.
 992  *
 993  * CONFORMANCE
 994  *
 995  * ECMA-234, Win32
 996  *
 997  */
 998 LONG WINAPI GetMessageTime(void)
 999 {
1000     MESSAGEQUEUE *queue;
1001
1002     if (!(queue = (MESSAGEQUEUE *)GlobalLock16( GetFastQueue() ))) return 0;
1003     return queue->GetMessageTimeVal;
1004 }
1005
1006
1007 /***********************************************************************
1008  *           GetMessageExtraInfo   (USER.288) (USER32.271)
1009  */
1010 LONG WINAPI GetMessageExtraInfo(void)
1011 {
1012     MESSAGEQUEUE *queue;
1013
1014     if (!(queue = (MESSAGEQUEUE *)GlobalLock16( GetFastQueue() ))) return 0;
1015     return queue->GetMessageExtraInfoVal;
1016 }