| 1 | /* $Id: EventQueue.cpp 22911 2009-09-10 12:02:36Z vboxsync $ */
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| 2 |
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| 3 | /** @file
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| 4 | *
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| 5 | * MS COM / XPCOM Abstraction Layer:
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| 6 | * Event and EventQueue class declaration
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| 7 | */
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| 8 |
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| 9 | /*
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| 10 | * Copyright (C) 2006-2007 Sun Microsystems, Inc.
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| 11 | *
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| 12 | * This file is part of VirtualBox Open Source Edition (OSE), as
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| 13 | * available from http://www.virtualbox.org. This file is free software;
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| 14 | * you can redistribute it and/or modify it under the terms of the GNU
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| 15 | * General Public License (GPL) as published by the Free Software
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| 16 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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| 17 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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| 18 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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| 19 | *
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| 20 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
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| 21 | * Clara, CA 95054 USA or visit http://www.sun.com if you need
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| 22 | * additional information or have any questions.
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| 23 | */
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| 24 |
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| 25 | #include "VBox/com/EventQueue.h"
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| 26 |
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| 27 | #ifdef RT_OS_DARWIN
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| 28 | # include <CoreFoundation/CFRunLoop.h>
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| 29 | #endif
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| 30 |
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| 31 | #if defined(VBOX_WITH_XPCOM) && !defined(RT_OS_DARWIN) && !defined(RT_OS_OS2)
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| 32 | # define USE_XPCOM_QUEUE
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| 33 | #endif
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| 34 |
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| 35 | #include <iprt/err.h>
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| 36 | #include <iprt/time.h>
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| 37 | #include <iprt/thread.h>
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| 38 | #ifdef USE_XPCOM_QUEUE
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| 39 | # include <errno.h>
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| 40 | #endif
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| 41 |
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| 42 | namespace com
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| 43 | {
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| 44 |
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| 45 | // EventQueue class
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| 46 | ////////////////////////////////////////////////////////////////////////////////
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| 47 |
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| 48 | #if defined (RT_OS_WINDOWS)
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| 49 |
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| 50 | #define CHECK_THREAD_RET(ret) \
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| 51 | do { \
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| 52 | AssertMsg (GetCurrentThreadId() == mThreadId, ("Must be on event queue thread!")); \
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| 53 | if (GetCurrentThreadId() != mThreadId) \
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| 54 | return ret; \
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| 55 | } while (0)
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| 56 |
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| 57 | #else // !defined (RT_OS_WINDOWS)
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| 58 |
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| 59 | #define CHECK_THREAD_RET(ret) \
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| 60 | do { \
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| 61 | if (!mEventQ) \
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| 62 | return ret; \
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| 63 | BOOL isOnCurrentThread = FALSE; \
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| 64 | mEventQ->IsOnCurrentThread (&isOnCurrentThread); \
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| 65 | AssertMsg (isOnCurrentThread, ("Must be on event queue thread!")); \
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| 66 | if (!isOnCurrentThread) \
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| 67 | return ret; \
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| 68 | } while (0)
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| 69 |
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| 70 | #endif // !defined (RT_OS_WINDOWS)
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| 71 |
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| 72 | EventQueue* EventQueue::mMainQueue = NULL;
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| 73 |
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| 74 | /**
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| 75 | * Constructs an event queue for the current thread.
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| 76 | *
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| 77 | * Currently, there can be only one event queue per thread, so if an event
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| 78 | * queue for the current thread already exists, this object is simply attached
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| 79 | * to the existing event queue.
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| 80 | */
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| 81 | EventQueue::EventQueue()
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| 82 | {
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| 83 | #if defined (RT_OS_WINDOWS)
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| 84 |
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| 85 | mThreadId = GetCurrentThreadId();
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| 86 | // force the system to create the message queue for the current thread
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| 87 | MSG msg;
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| 88 | PeekMessage (&msg, NULL, WM_USER, WM_USER, PM_NOREMOVE);
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| 89 |
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| 90 | #else
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| 91 |
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| 92 | mEQCreated = FALSE;
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| 93 |
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| 94 | mLastEvent = NULL;
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| 95 | mGotEvent = FALSE;
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| 96 |
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| 97 | // Here we reference the global nsIEventQueueService instance and hold it
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| 98 | // until we're destroyed. This is necessary to keep NS_ShutdownXPCOM() away
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| 99 | // from calling StopAcceptingEvents() on all event queues upon destruction of
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| 100 | // nsIEventQueueService, and makes sense when, for some reason, this happens
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| 101 | // *before* we're able to send a NULL event to stop our event handler thread
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| 102 | // when doing unexpected cleanup caused indirectly by NS_ShutdownXPCOM()
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| 103 | // that is performing a global cleanup of everything. A good example of such
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| 104 | // situation is when NS_ShutdownXPCOM() is called while the VirtualBox component
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| 105 | // is still alive (because it is still referenced): eventually, it results in
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| 106 | // a VirtualBox::uninit() call from where it is already not possible to post
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| 107 | // NULL to the event thread (because it stopped accepting events).
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| 108 |
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| 109 | nsresult rc = NS_GetEventQueueService (getter_AddRefs (mEventQService));
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| 110 |
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| 111 | if (NS_SUCCEEDED(rc))
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| 112 | {
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| 113 | rc = mEventQService->GetThreadEventQueue (NS_CURRENT_THREAD,
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| 114 | getter_AddRefs (mEventQ));
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| 115 | if (rc == NS_ERROR_NOT_AVAILABLE)
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| 116 | {
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| 117 | rc = mEventQService->CreateMonitoredThreadEventQueue();
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| 118 | if (NS_SUCCEEDED(rc))
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| 119 | {
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| 120 | mEQCreated = TRUE;
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| 121 | rc = mEventQService->GetThreadEventQueue (NS_CURRENT_THREAD,
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| 122 | getter_AddRefs (mEventQ));
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| 123 | }
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| 124 | }
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| 125 | }
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| 126 | AssertComRC (rc);
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| 127 |
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| 128 | #endif
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| 129 | }
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| 130 |
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| 131 | EventQueue::~EventQueue()
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| 132 | {
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| 133 | #if defined (RT_OS_WINDOWS)
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| 134 | #else
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| 135 | // process all pending events before destruction
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| 136 | if (mEventQ)
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| 137 | {
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| 138 | if (mEQCreated)
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| 139 | {
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| 140 | mEventQ->StopAcceptingEvents();
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| 141 | mEventQ->ProcessPendingEvents();
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| 142 | mEventQService->DestroyThreadEventQueue();
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| 143 | }
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| 144 | mEventQ = nsnull;
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| 145 | mEventQService = nsnull;
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| 146 | }
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| 147 | #endif
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| 148 | }
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| 149 |
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| 150 | /* static */ int EventQueue::init()
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| 151 | {
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| 152 | mMainQueue = new EventQueue();
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| 153 | #if defined (VBOX_WITH_XPCOM)
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| 154 | nsCOMPtr<nsIEventQueue> q;
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| 155 | nsresult rv = NS_GetMainEventQ(getter_AddRefs(q));
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| 156 | Assert(NS_SUCCEEDED(rv));
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| 157 | Assert(q == mMainQueue->mEventQ);
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| 158 | PRBool fIsNative = PR_FALSE;
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| 159 | rv = mMainQueue->mEventQ->IsQueueNative(&fIsNative);
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| 160 | Assert(NS_SUCCEEDED(rv) && fIsNative);
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| 161 | #endif
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| 162 | return VINF_SUCCESS;
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| 163 | }
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| 164 |
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| 165 | /* static */ int EventQueue::deinit()
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| 166 | {
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| 167 | delete mMainQueue;
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| 168 | mMainQueue = NULL;
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| 169 | return VINF_SUCCESS;
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| 170 | }
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| 171 |
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| 172 | /* static */ EventQueue* EventQueue::getMainEventQueue()
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| 173 | {
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| 174 | return mMainQueue;
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| 175 | }
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| 176 |
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| 177 | #ifdef RT_OS_DARWIN
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| 178 | static int
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| 179 | timedWaitForEventsOnDarwin(nsIEventQueue *pQueue, PRInt32 cMsTimeout)
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| 180 | {
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| 181 | OSStatus orc = -1;
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| 182 | CFTimeInterval rdTimeout = (double)cMsTimeout / 1000;
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| 183 | orc = CFRunLoopRunInMode(kCFRunLoopDefaultMode, rdTimeout, true /*returnAfterSourceHandled*/);
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| 184 | if (orc == kCFRunLoopRunHandledSource)
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| 185 | orc = CFRunLoopRunInMode(kCFRunLoopDefaultMode, 0.0, false /*returnAfterSourceHandled*/);
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| 186 | if (!orc || orc == kCFRunLoopRunHandledSource)
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| 187 | return VINF_SUCCESS;
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| 188 |
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| 189 | if (orc != kCFRunLoopRunTimedOut)
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| 190 | {
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| 191 | NS_WARNING("Unexpected status code from CFRunLoopRunInMode");
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| 192 | }
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| 193 |
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| 194 | return VERR_TIMEOUT;
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| 195 | }
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| 196 | #endif
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| 197 |
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| 198 | #ifdef RT_OS_WINDOWS
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| 199 | static int
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| 200 | processPendingEvents()
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| 201 | {
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| 202 | MSG Msg;
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| 203 | int rc = VERR_TIMEOUT;
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| 204 | while (PeekMessage(&Msg, NULL /*hWnd*/, 0 /*wMsgFilterMin*/, 0 /*wMsgFilterMax*/, PM_REMOVE))
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| 205 | {
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| 206 | if (Msg.message == WM_QUIT)
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| 207 | rc = VERR_INTERRUPTED;
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| 208 | DispatchMessage(&Msg);
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| 209 | if (rc == VERR_INTERRUPTED)
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| 210 | break;
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| 211 | rc = VINF_SUCCESS;
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| 212 | }
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| 213 | return rc;
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| 214 | }
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| 215 | /** For automatic cleanup, */
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| 216 | class MyThreadHandle
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| 217 | {
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| 218 | public:
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| 219 | HANDLE mh;
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| 220 |
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| 221 | MyThreadHandle()
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| 222 | {
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| 223 | if (!DuplicateHandle(GetCurrentProcess(),
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| 224 | GetCurrentThread(),
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| 225 | GetCurrentProcess(),
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| 226 | &mh,
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| 227 | 0 /*dwDesiredAccess*/,
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| 228 | FALSE /*bInheritHandle*/,
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| 229 | DUPLICATE_SAME_ACCESS))
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| 230 | mh = INVALID_HANDLE_VALUE;
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| 231 | }
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| 232 |
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| 233 | ~MyThreadHandle()
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| 234 | {
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| 235 | CloseHandle(mh);
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| 236 | mh = INVALID_HANDLE_VALUE;
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| 237 | }
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| 238 | };
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| 239 | #else
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| 240 | static int
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| 241 | processPendingEvents(nsIEventQueue* pQueue)
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| 242 | {
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| 243 | /** @todo: rethink interruption events, current NULL event approach is bad */
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| 244 | pQueue->ProcessPendingEvents();
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| 245 | return VINF_SUCCESS;
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| 246 | }
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| 247 | #endif
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| 248 | int EventQueue::processEventQueue(uint32_t cMsTimeout)
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| 249 | {
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| 250 | int rc = VINF_SUCCESS;
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| 251 | /** @todo: check that current thread == one we were created on */
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| 252 | #if defined (VBOX_WITH_XPCOM)
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| 253 | do {
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| 254 | PRBool fHasEvents = PR_FALSE;
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| 255 | nsresult rc;
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| 256 |
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| 257 | rc = mEventQ->PendingEvents(&fHasEvents);
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| 258 | if (NS_FAILED (rc))
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| 259 | return VERR_INTERNAL_ERROR_3;
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| 260 |
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| 261 | if (fHasEvents || cMsTimeout == 0)
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| 262 | break;
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| 263 |
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| 264 | /**
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| 265 | * Unfortunately, WaitForEvent isn't interruptible with Ctrl-C,
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| 266 | * while select() is.
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| 267 | */
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| 268 |
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| 269 | if (cMsTimeout == RT_INDEFINITE_WAIT)
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| 270 | {
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| 271 | #if 0
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| 272 | PLEvent *pEvent = NULL;
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| 273 | int rc1 = mEventQ->WaitForEvent(&pEvent);
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| 274 | if (NS_FAILED(rc1) || pEvent == NULL)
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| 275 | {
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| 276 | rc = VERR_INTERRUPTED;
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| 277 | break;
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| 278 | }
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| 279 | mEventQ->HandleEvent(pEvent);
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| 280 | break;
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| 281 | #else
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| 282 | /* Pretty close to forever */
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| 283 | cMsTimeout = 0xffff0000;
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| 284 | #endif
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| 285 | }
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| 286 |
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| 287 | /* Bit tricky part - perform timed wait */
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| 288 | # ifdef RT_OS_DARWIN
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| 289 | rc = timedWaitForEventsOnDarwin(mEventQ, cMsTimeout);
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| 290 | # else
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| 291 | int fd = mEventQ->GetEventQueueSelectFD();
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| 292 | fd_set fdsetR, fdsetE;
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| 293 | struct timeval tv;
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| 294 |
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| 295 | FD_ZERO(&fdsetR);
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| 296 | FD_SET(fd, &fdsetR);
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| 297 |
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| 298 | fdsetE = fdsetR;
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| 299 | tv.tv_sec = (PRInt64)cMsTimeout / 1000;
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| 300 | tv.tv_usec = ((PRInt64)cMsTimeout % 1000) * 1000;
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| 301 |
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| 302 | int aCode = select(fd + 1, &fdsetR, NULL, &fdsetE, &tv);
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| 303 | if (aCode == 0)
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| 304 | rc = VERR_TIMEOUT;
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| 305 | else if (aCode == EINTR)
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| 306 | rc = VERR_INTERRUPTED;
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| 307 | else if (aCode < 0)
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| 308 | rc = VERR_INTERNAL_ERROR_4;
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| 309 |
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| 310 | # endif
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| 311 | } while (0);
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| 312 |
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| 313 | rc = processPendingEvents(mEventQ);
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| 314 | #else /* Windows */
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| 315 | do {
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| 316 | int aCode = processPendingEventsOnWindows();
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| 317 | if (aCode != VERR_TIMEOUT || cMsTimeout == 0)
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| 318 | {
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| 319 | rc = aCode;
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| 320 | break;
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| 321 | }
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| 322 |
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| 323 | if (cMsTimeout == RT_INDEFINITE_WAIT)
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| 324 | {
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| 325 | Event* aEvent = NULL;
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| 326 |
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| 327 | BOOL fHasEvent = waitForEvent(&aEvent);
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| 328 | if (fHasEvent)
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| 329 | handleEvent(aEvent);
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| 330 | else
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| 331 | rc = VERR_INTERRUPTED;
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| 332 | break;
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| 333 | }
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| 334 |
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| 335 | /* Perform timed wait */
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| 336 | MyThreadHandle aHandle;
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| 337 |
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| 338 | DWORD aCode2 = MsgWaitForMultipleObjects(1, &aHandle.mh,
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| 339 | TRUE /*fWaitAll*/,
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| 340 | 0 /*ms*/,
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| 341 | QS_ALLINPUT);
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| 342 | if (aCode2 == WAIT_TIMEOUT)
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| 343 | rc = VERR_TIMEOUT;
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| 344 | else if (aCode2 == WAIT_OBJECT_0)
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| 345 | rc = VINF_SUCCESS;
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| 346 | else
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| 347 | rc = VERR_INTERNAL_ERROR_4;
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| 348 | } while (0);
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| 349 |
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| 350 | rc = processPendingEvents();
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| 351 | #endif
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| 352 | return rc;
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| 353 | }
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| 354 |
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| 355 | int EventQueue::interruptEventQueueProcessing()
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| 356 | {
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| 357 | /** @todo: rethink me! */
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| 358 | postEvent(NULL);
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| 359 | return VINF_SUCCESS;
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| 360 | }
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| 361 |
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| 362 | /**
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| 363 | * Posts an event to this event loop asynchronously.
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| 364 | *
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| 365 | * @param event the event to post, must be allocated using |new|
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| 366 | * @return TRUE if successful and false otherwise
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| 367 | */
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| 368 | BOOL EventQueue::postEvent (Event *event)
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| 369 | {
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| 370 | #if defined (RT_OS_WINDOWS)
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| 371 |
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| 372 | return PostThreadMessage (mThreadId, WM_USER, (WPARAM) event, NULL);
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| 373 |
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| 374 | #else
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| 375 |
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| 376 | if (!mEventQ)
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| 377 | return FALSE;
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| 378 |
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| 379 | MyPLEvent *ev = new MyPLEvent (event);
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| 380 | mEventQ->InitEvent (ev, this, plEventHandler, plEventDestructor);
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| 381 | HRESULT rc = mEventQ->PostEvent (ev);
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| 382 | return NS_SUCCEEDED(rc);
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| 383 |
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| 384 | #endif
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| 385 | }
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| 386 |
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| 387 | /**
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| 388 | * Waits for a single event.
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| 389 | * This method must be called on the same thread where this event queue
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| 390 | * is created.
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| 391 | *
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| 392 | * After this method returns TRUE and non-NULL event, the caller should call
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| 393 | * #handleEvent() in order to process the returned event (otherwise the event
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| 394 | * is just removed from the queue, but not processed).
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| 395 | *
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| 396 | * There is a special case when the returned event is NULL (and the method
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| 397 | * returns TRUE), meaning that this event queue must finish its execution
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| 398 | * (i.e., quit the event loop),
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| 399 | *
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| 400 | * @param event next event removed from the queue
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| 401 | * @return TRUE if successful and false otherwise
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| 402 | */
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| 403 | BOOL EventQueue::waitForEvent (Event **event)
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| 404 | {
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| 405 | Assert (event);
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| 406 | if (!event)
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| 407 | return FALSE;
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| 408 |
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| 409 | *event = NULL;
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| 410 |
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| 411 | CHECK_THREAD_RET (FALSE);
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| 412 |
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| 413 | #if defined (RT_OS_WINDOWS)
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| 414 |
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| 415 | MSG msg;
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| 416 | BOOL rc = GetMessage (&msg, NULL, WM_USER, WM_USER);
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| 417 | // check for error
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| 418 | if (rc == -1)
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| 419 | return FALSE;
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| 420 | // check for WM_QUIT
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| 421 | if (!rc)
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| 422 | return TRUE;
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| 423 |
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| 424 | // retrieve our event
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| 425 | *event = (Event *) msg.wParam;
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| 426 |
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| 427 | #else
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| 428 |
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| 429 | PLEvent *ev = NULL;
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| 430 | HRESULT rc;
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| 431 |
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| 432 | mGotEvent = FALSE;
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| 433 |
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| 434 | do
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| 435 | {
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| 436 | rc = mEventQ->WaitForEvent (&ev);
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| 437 | // check for error
|
|---|
| 438 | if (FAILED (rc))
|
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| 439 | return FALSE;
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| 440 | // check for EINTR signal
|
|---|
| 441 | if (!ev)
|
|---|
| 442 | return TRUE;
|
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| 443 |
|
|---|
| 444 | // run PLEvent handler. This will just set mLastEvent if it is an
|
|---|
| 445 | // MyPLEvent instance, and then delete ev.
|
|---|
| 446 | mEventQ->HandleEvent (ev);
|
|---|
| 447 | }
|
|---|
| 448 | while (!mGotEvent);
|
|---|
| 449 |
|
|---|
| 450 | // retrieve our event
|
|---|
| 451 | *event = mLastEvent;
|
|---|
| 452 |
|
|---|
| 453 | #endif
|
|---|
| 454 |
|
|---|
| 455 | return TRUE;
|
|---|
| 456 | }
|
|---|
| 457 |
|
|---|
| 458 | /**
|
|---|
| 459 | * Handles the given event and |delete|s it.
|
|---|
| 460 | * This method must be called on the same thread where this event queue
|
|---|
| 461 | * is created.
|
|---|
| 462 | */
|
|---|
| 463 | BOOL EventQueue::handleEvent (Event *event)
|
|---|
| 464 | {
|
|---|
| 465 | Assert (event);
|
|---|
| 466 | if (!event)
|
|---|
| 467 | return FALSE;
|
|---|
| 468 |
|
|---|
| 469 | CHECK_THREAD_RET (FALSE);
|
|---|
| 470 |
|
|---|
| 471 | event->handler();
|
|---|
| 472 | delete event;
|
|---|
| 473 |
|
|---|
| 474 | return TRUE;
|
|---|
| 475 | }
|
|---|
| 476 |
|
|---|
| 477 | int EventQueue::getSelectFD()
|
|---|
| 478 | {
|
|---|
| 479 | #ifdef VBOX_WITH_XPCOM
|
|---|
| 480 | return mEventQ->GetEventQueueSelectFD();
|
|---|
| 481 | #else
|
|---|
| 482 | return -1;
|
|---|
| 483 | #endif
|
|---|
| 484 | }
|
|---|
| 485 | }
|
|---|
| 486 | /* namespace com */
|
|---|
| 487 |
|
|---|
