windows/queue.c

   1 /*
   2  * Message queues related functions
   3  *
   4  * Copyright 1993, 1994 Alexandre Julliard
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20
  21 #include <string.h>
  22 #include <signal.h>
  23 #include <assert.h>
  24 #include "windef.h"
  25 #include "wingdi.h"
  26 #include "winerror.h"
  27 #include "wine/winbase16.h"
  28 #include "wine/winuser16.h"
  29 #include "queue.h"
  30 #include "win.h"
  31 #include "user.h"
  32 #include "thread.h"
  33 #include "wine/debug.h"
  34 #include "wine/server.h"
  35 #include "spy.h"
  36
  37 WINE_DEFAULT_DEBUG_CHANNEL(msg);
  38
  39
  40 /***********************************************************************
  41  *           QUEUE_CreateMsgQueue
  42  *
  43  * Creates a message queue. Doesn't link it into queue list!
  44  */
  45 static HQUEUE16 QUEUE_CreateMsgQueue(void)
  46 {
  47     HQUEUE16 hQueue;
  48     HANDLE handle;
  49     MESSAGEQUEUE * msgQueue;
  50
  51     TRACE_(msg)("(): Creating message queue...\n");
  52
  53     if (!(hQueue = GlobalAlloc16( GMEM_FIXED | GMEM_ZEROINIT,
  54                                   sizeof(MESSAGEQUEUE) )))
  55         return 0;
  56
  57     msgQueue = (MESSAGEQUEUE *) GlobalLock16( hQueue );
  58     if ( !msgQueue )
  59         return 0;
  60
  61     SERVER_START_REQ( get_msg_queue )
  62     {
  63         wine_server_call_err( req );
  64         handle = reply->handle;
  65     }
  66     SERVER_END_REQ;
  67     if (!handle)
  68     {
  69         ERR_(msg)("Cannot get thread queue");
  70         GlobalFree16( hQueue );
  71         return 0;
  72     }
  73     msgQueue->server_queue = handle;
  74     msgQueue->self = hQueue;
  75     return hQueue;
  76 }
  77
  78
  79 /***********************************************************************
  80  *           QUEUE_Current
  81  *
  82  * Get the current thread queue, creating it if required.
  83  * QUEUE_Unlock is not needed since the queue can only be deleted by
  84  * the current thread anyway.
  85  */
  86 MESSAGEQUEUE *QUEUE_Current(void)
  87 {
  88     HQUEUE16 hQueue = NtCurrentTeb()->queue;
  89
  90     if (!hQueue)
  91     {
  92         if (!(hQueue = QUEUE_CreateMsgQueue())) return NULL;
  93         SetThreadQueue16( 0, hQueue );
  94     }
  95
  96     return GlobalLock16( hQueue );
  97 }
  98
  99
 100
 101 /***********************************************************************
 102  *           QUEUE_DeleteMsgQueue
 103  *
 104  * Delete a message queue.
 105  */
 106 void QUEUE_DeleteMsgQueue(void)
 107 {
 108     HQUEUE16 hQueue = NtCurrentTeb()->queue;
 109     MESSAGEQUEUE * msgQueue;
 110
 111     if (!hQueue) return;  /* thread doesn't have a queue */
 112
 113     TRACE("(): Deleting message queue %04x\n", hQueue);
 114
 115     if (!(msgQueue = GlobalLock16( hQueue )))
 116     {
 117         ERR("invalid thread queue\n");
 118         return;
 119     }
 120
 121     SetThreadQueue16( 0, 0 );
 122     CloseHandle( msgQueue->server_queue );
 123     GlobalFree16( hQueue );
 124 }
 125
 126
 127 /***********************************************************************
 128  *              InitThreadInput   (USER.409)
 129  */
 130 HQUEUE16 WINAPI InitThreadInput16( WORD unknown, WORD flags )
 131 {
 132     MESSAGEQUEUE *queue = QUEUE_Current();
 133     return queue ? queue->self : 0;
 134 }
 135
 136 /***********************************************************************
 137  *              GetQueueStatus (USER32.@)
 138  */
 139 DWORD WINAPI GetQueueStatus( UINT flags )
 140 {
 141     DWORD ret = 0;
 142
 143     SERVER_START_REQ( get_queue_status )
 144     {
 145         req->clear = 1;
 146         wine_server_call( req );
 147         ret = MAKELONG( reply->changed_bits & flags, reply->wake_bits & flags );
 148     }
 149     SERVER_END_REQ;
 150     return ret;
 151 }
 152
 153
 154 /***********************************************************************
 155  *              GetInputState   (USER32.@)
 156  */
 157 BOOL WINAPI GetInputState(void)
 158 {
 159     DWORD ret = 0;
 160
 161     SERVER_START_REQ( get_queue_status )
 162     {
 163         req->clear = 0;
 164         wine_server_call( req );
 165         ret = reply->wake_bits & (QS_KEY | QS_MOUSEBUTTON);
 166     }
 167     SERVER_END_REQ;
 168     return ret;
 169 }
 170
 171 /***********************************************************************
 172  *              GetMessagePos (USER.119)
 173  *              GetMessagePos (USER32.@)
 174  *
 175  * The GetMessagePos() function returns a long value representing a
 176  * cursor position, in screen coordinates, when the last message
 177  * retrieved by the GetMessage() function occurs. The x-coordinate is
 178  * in the low-order word of the return value, the y-coordinate is in
 179  * the high-order word. The application can use the MAKEPOINT()
 180  * macro to obtain a POINT structure from the return value.
 181  *
 182  * For the current cursor position, use GetCursorPos().
 183  *
 184  * RETURNS
 185  *
 186  * Cursor position of last message on success, zero on failure.
 187  *
 188  * CONFORMANCE
 189  *
 190  * ECMA-234, Win32
 191  *
 192  */
 193 DWORD WINAPI GetMessagePos(void)
 194 {
 195     MESSAGEQUEUE *queue;
 196
 197     if (!(queue = QUEUE_Current())) return 0;
 198     return queue->GetMessagePosVal;
 199 }
 200
 201
 202 /***********************************************************************
 203  *              GetMessageTime (USER.120)
 204  *              GetMessageTime (USER32.@)
 205  *
 206  * GetMessageTime() returns the message time for the last message
 207  * retrieved by the function. The time is measured in milliseconds with
 208  * the same offset as GetTickCount().
 209  *
 210  * Since the tick count wraps, this is only useful for moderately short
 211  * relative time comparisons.
 212  *
 213  * RETURNS
 214  *
 215  * Time of last message on success, zero on failure.
 216  *
 217  * CONFORMANCE
 218  *
 219  * ECMA-234, Win32
 220  *
 221  */
 222 LONG WINAPI GetMessageTime(void)
 223 {
 224     MESSAGEQUEUE *queue;
 225
 226     if (!(queue = QUEUE_Current())) return 0;
 227     return queue->GetMessageTimeVal;
 228 }
 229
 230
 231 /***********************************************************************
 232  *              GetMessageExtraInfo (USER.288)
 233  *              GetMessageExtraInfo (USER32.@)
 234  */
 235 LONG WINAPI GetMessageExtraInfo(void)
 236 {
 237     MESSAGEQUEUE *queue;
 238
 239     if (!(queue = QUEUE_Current())) return 0;
 240     return queue->GetMessageExtraInfoVal;
 241 }