357 lines
8.8 KiB
C++
357 lines
8.8 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1998
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Sergei Dolgov <sergei_d@fi.tartu.ee>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#include "nsToolkit.h"
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#include "prmon.h"
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#include "nsSwitchToUIThread.h"
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#include "prprf.h"
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#include "nsWidgetAtoms.h"
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//
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// Static thread local storage index of the Toolkit
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// object associated with a given thread...
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//
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static PRUintn gToolkitTLSIndex = 0;
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//-------------------------------------------------------------------------
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//
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// nsISupports implementation macro
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//
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//-------------------------------------------------------------------------
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NS_IMPL_THREADSAFE_ISUPPORTS1(nsToolkit, nsIToolkit)
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struct ThreadInterfaceData
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{
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void *data;
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thread_id waitingThread;
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};
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//
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// main for the message pump thread
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//
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PRBool gThreadState = PR_FALSE;
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struct ThreadInitInfo {
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PRMonitor *monitor;
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nsToolkit *toolkit;
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};
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void nsToolkit::RunPump(void* arg)
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{
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int32 code;
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char portname[64];
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ThreadInterfaceData id;
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#ifdef DEBUG
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printf("TK-RunPump\n");
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#endif
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ThreadInitInfo *info = (ThreadInitInfo*)arg;
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PR_EnterMonitor(info->monitor);
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gThreadState = PR_TRUE;
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PR_Notify(info->monitor);
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PR_ExitMonitor(info->monitor);
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delete info;
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// system wide unique names
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PR_snprintf(portname, sizeof(portname), "event%lx",
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(long unsigned) PR_GetCurrentThread());
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port_id event = create_port(200, portname);
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while(read_port_etc(event, &code, &id, sizeof(id), B_TIMEOUT, 1000) >= 0)
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{
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MethodInfo *mInfo = (MethodInfo *)id.data;
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mInfo->Invoke();
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if(id.waitingThread != 0)
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resume_thread(id.waitingThread);
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delete mInfo;
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}
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}
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//-------------------------------------------------------------------------
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//
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// constructor
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//
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//-------------------------------------------------------------------------
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nsToolkit::nsToolkit()
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{
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localthread = false;
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mGuiThread = NULL;
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}
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//-------------------------------------------------------------------------
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//
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// destructor
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//
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//-------------------------------------------------------------------------
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nsToolkit::~nsToolkit()
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{
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Kill();
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PR_SetThreadPrivate(gToolkitTLSIndex, nsnull);
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}
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void nsToolkit::Kill()
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{
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if(localthread)
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{
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GetInterface();
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// interrupt message flow
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close_port(eventport);
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}
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}
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//-------------------------------------------------------------------------
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//
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// Create a new thread and run the message pump in there
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//
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//-------------------------------------------------------------------------
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void nsToolkit::CreateUIThread()
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{
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#ifdef DEBUG
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printf("TK-CUIT\n");
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#endif
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PRMonitor *monitor = ::PR_NewMonitor();
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PR_EnterMonitor(monitor);
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ThreadInitInfo *ti = new ThreadInitInfo();
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if (ti)
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{
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ti->monitor = monitor;
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ti->toolkit = this;
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// create a gui thread
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mGuiThread = PR_CreateThread(PR_SYSTEM_THREAD,
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RunPump,
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(void*)ti,
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PR_PRIORITY_HIGH,
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PR_LOCAL_THREAD,
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PR_UNJOINABLE_THREAD,
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0);
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// wait for the gui thread to start
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while(gThreadState == PR_FALSE)
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{
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PR_Wait(monitor, PR_INTERVAL_NO_TIMEOUT);
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}
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}
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// at this point the thread is running
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PR_ExitMonitor(monitor);
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PR_DestroyMonitor(monitor);
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}
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//-------------------------------------------------------------------------
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//
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//
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//-------------------------------------------------------------------------
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NS_METHOD nsToolkit::Init(PRThread *aThread)
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{
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#ifdef DEBUG
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printf("TKInit\n");
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#endif
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Kill();
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// Store the thread ID of the thread containing the message pump.
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// If no thread is provided create one
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if (NULL != aThread)
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{
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mGuiThread = aThread;
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localthread = false;
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}
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else
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{
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localthread = true;
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// create a thread where the message pump will run
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CreateUIThread();
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}
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cached = false;
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nsWidgetAtoms::RegisterAtoms();
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return NS_OK;
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}
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void nsToolkit::GetInterface()
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{
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#ifdef DEBUG
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printf("TK-GI\n");
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#endif
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if(! cached)
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{
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char portname[64];
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PR_snprintf(portname, sizeof(portname), "event%lx",
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(long unsigned) mGuiThread);
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eventport = find_port(portname);
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cached = true;
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}
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}
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// Synchronous version, not in use at the moment
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bool nsToolkit::CallMethod(MethodInfo *info)
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{
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#ifdef DEBUG
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printf("TK-CM\n");
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#endif
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ThreadInterfaceData id;
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GetInterface();
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id.data = info;
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id.waitingThread = find_thread(NULL);
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// Check message count to not exceed the port's capacity.
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// There seems to be a BeOS bug that allows more
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// messages on a port than its capacity.
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port_info portinfo;
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if (get_port_info(eventport, &portinfo) != B_OK)
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{
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return false;
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}
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if (port_count(eventport) < portinfo.capacity - 20)
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{
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// If we cannot write inside 5 seconds, something is really wrong.
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if(write_port_etc(eventport, WM_CALLMETHOD, &id, sizeof(id), B_TIMEOUT, 5000000) == B_OK)
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{
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// semantics for CallMethod are that it should be synchronous
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suspend_thread(id.waitingThread);
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return true;
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}
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}
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return false;
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}
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// to be used only from a BView or BWindow
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bool nsToolkit::CallMethodAsync(MethodInfo *info)
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{
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#ifdef DEBUG
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printf("CMA\n");
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#endif
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ThreadInterfaceData id;
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GetInterface();
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id.data = info;
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id.waitingThread = 0;
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// Check message count to not exceed the port's capacity.
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// There seems to be a BeOS bug that allows more
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// messages on a port than its capacity.
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port_info portinfo;
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if (get_port_info(eventport, &portinfo) != B_OK)
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{
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return false;
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}
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if (port_count(eventport) < portinfo.capacity - 20)
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{
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if(write_port_etc(eventport, WM_CALLMETHOD, &id, sizeof(id), B_TIMEOUT, 0) == B_OK)
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{
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return true;
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}
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}
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return false;
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}
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//-------------------------------------------------------------------------
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//
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// Return the nsIToolkit for the current thread. If a toolkit does not
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// yet exist, then one will be created...
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//
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//-------------------------------------------------------------------------
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NS_METHOD NS_GetCurrentToolkit(nsIToolkit* *aResult)
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{
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nsIToolkit* toolkit = nsnull;
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nsresult rv = NS_OK;
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PRStatus status;
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#ifdef DEBUG
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printf("TK-GetCTK\n");
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#endif
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// Create the TLS index the first time through...
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if (0 == gToolkitTLSIndex)
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{
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status = PR_NewThreadPrivateIndex(&gToolkitTLSIndex, NULL);
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if (PR_FAILURE == status)
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{
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rv = NS_ERROR_FAILURE;
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}
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}
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if (NS_SUCCEEDED(rv))
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{
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toolkit = (nsIToolkit*)PR_GetThreadPrivate(gToolkitTLSIndex);
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//
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// Create a new toolkit for this thread...
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//
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if (!toolkit)
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{
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toolkit = new nsToolkit();
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if (!toolkit)
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{
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rv = NS_ERROR_OUT_OF_MEMORY;
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}
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else
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{
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NS_ADDREF(toolkit);
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toolkit->Init(PR_GetCurrentThread());
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//
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// The reference stored in the TLS is weak. It is removed in the
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// nsToolkit destructor...
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//
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PR_SetThreadPrivate(gToolkitTLSIndex, (void*)toolkit);
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}
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}
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else
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{
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NS_ADDREF(toolkit);
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}
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*aResult = toolkit;
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}
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return rv;
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}
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