| 1 | /* $Id: VirtualBoxClientImpl.cpp 35368 2010-12-30 13:38:23Z vboxsync $ */
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| 2 | /** @file
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| 3 | * VirtualBox COM class implementation
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2010 Oracle Corporation
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| 8 | *
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| 9 | * This file is part of VirtualBox Open Source Edition (OSE), as
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| 10 | * available from http://www.virtualbox.org. This file is free software;
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| 11 | * you can redistribute it and/or modify it under the terms of the GNU
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| 12 | * General Public License (GPL) as published by the Free Software
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| 13 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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| 14 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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| 15 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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| 16 | */
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| 17 |
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| 18 | #include "VirtualBoxClientImpl.h"
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| 19 |
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| 20 | #include "AutoCaller.h"
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| 21 | #include "VBoxEvents.h"
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| 22 | #include "Logging.h"
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| 23 |
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| 24 | #include <iprt/asm.h>
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| 25 | #include <iprt/thread.h>
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| 26 | #include <iprt/critsect.h>
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| 27 | #include <iprt/semaphore.h>
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| 28 | #include <iprt/cpp/utils.h>
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| 29 |
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| 30 |
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| 31 | /** Waiting time between probing whether VBoxSVC is alive. */
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| 32 | #define VBOXCLIENT_DEFAULT_INTERVAL 30000
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| 33 |
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| 34 |
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| 35 | /** Initialize instance counter class variable */
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| 36 | uint32_t VirtualBoxClient::g_cInstances = 0;
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| 37 |
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| 38 |
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| 39 | // constructor / destructor
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| 40 | /////////////////////////////////////////////////////////////////////////////
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| 41 |
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| 42 | HRESULT VirtualBoxClient::FinalConstruct()
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| 43 | {
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| 44 | return init();
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| 45 | }
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| 46 |
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| 47 | void VirtualBoxClient::FinalRelease()
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| 48 | {
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| 49 | uninit();
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| 50 | }
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| 51 |
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| 52 | // public initializer/uninitializer for internal purposes only
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| 53 | /////////////////////////////////////////////////////////////////////////////
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| 54 |
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| 55 | /**
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| 56 | * Initializes the VirtualBoxClient object.
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| 57 | *
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| 58 | * @returns COM result indicator
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| 59 | */
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| 60 | HRESULT VirtualBoxClient::init()
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| 61 | {
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| 62 | LogFlowThisFunc(("\n"));
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| 63 |
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| 64 | HRESULT rc;
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| 65 | /* Enclose the state transition NotReady->InInit->Ready */
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| 66 | AutoInitSpan autoInitSpan(this);
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| 67 | AssertReturn(autoInitSpan.isOk(), E_FAIL);
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| 68 |
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| 69 | mData.m_ThreadWatcher = NIL_RTTHREAD;
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| 70 | mData.m_SemEvWatcher = NIL_RTSEMEVENT;
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| 71 |
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| 72 | if (ASMAtomicIncU32(&g_cInstances) != 1)
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| 73 | AssertFailedReturn(E_FAIL);
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| 74 |
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| 75 | rc = mData.m_pVirtualBox.createLocalObject(CLSID_VirtualBox);
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| 76 | AssertComRCReturnRC(rc);
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| 77 |
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| 78 | rc = unconst(mData.m_pEventSource).createObject();
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| 79 | AssertComRCReturnRC(rc);
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| 80 | rc = mData.m_pEventSource->init(static_cast<IVirtualBoxClient *>(this));
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| 81 | AssertComRCReturnRC(rc);
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| 82 |
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| 83 | /* Setting up the VBoxSVC watcher thread. If anything goes wrong here it
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| 84 | * is not considered important enough to cause any sort of visible
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| 85 | * failure. The monitoring will not be done, but that's all. */
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| 86 | int vrc = RTSemEventCreate(&mData.m_SemEvWatcher);
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| 87 | AssertRC(vrc);
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| 88 | if (RT_SUCCESS(vrc))
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| 89 | {
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| 90 | vrc = RTThreadCreate(&mData.m_ThreadWatcher, SVCWatcherThread,
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| 91 | this, 0, RTTHREADTYPE_INFREQUENT_POLLER,
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| 92 | RTTHREADFLAGS_WAITABLE, "VBoxSVCWatcher");
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| 93 | AssertRC(vrc);
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| 94 | }
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| 95 | else
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| 96 | {
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| 97 | RTSemEventDestroy(mData.m_SemEvWatcher);
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| 98 | mData.m_SemEvWatcher = NIL_RTSEMEVENT;
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| 99 | }
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| 100 |
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| 101 | /* Confirm a successful initialization */
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| 102 | autoInitSpan.setSucceeded();
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| 103 |
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| 104 | return rc;
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| 105 | }
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| 106 |
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| 107 | /**
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| 108 | * Uninitializes the instance and sets the ready flag to FALSE.
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| 109 | * Called either from FinalRelease() or by the parent when it gets destroyed.
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| 110 | */
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| 111 | void VirtualBoxClient::uninit()
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| 112 | {
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| 113 | LogFlowThisFunc(("\n"));
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| 114 |
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| 115 | /* Enclose the state transition Ready->InUninit->NotReady */
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| 116 | AutoUninitSpan autoUninitSpan(this);
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| 117 | if (autoUninitSpan.uninitDone())
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| 118 | return;
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| 119 |
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| 120 | if (mData.m_ThreadWatcher != NIL_RTTHREAD)
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| 121 | {
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| 122 | /* Signal the event semaphore and wait for the thread to terminate.
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| 123 | * if it hangs for some reason exit anyway, this can cause a crash
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| 124 | * though as the object will no longer be available. */
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| 125 | RTSemEventSignal(mData.m_SemEvWatcher);
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| 126 | RTThreadWait(mData.m_ThreadWatcher, 30000, NULL);
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| 127 | mData.m_ThreadWatcher = NIL_RTTHREAD;
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| 128 | RTSemEventDestroy(mData.m_SemEvWatcher);
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| 129 | mData.m_SemEvWatcher = NIL_RTSEMEVENT;
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| 130 | }
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| 131 |
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| 132 | mData.m_pVirtualBox.setNull();
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| 133 |
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| 134 | ASMAtomicDecU32(&g_cInstances);
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| 135 | }
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| 136 |
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| 137 | // IVirtualBoxClient properties
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| 138 | /////////////////////////////////////////////////////////////////////////////
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| 139 |
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| 140 | /**
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| 141 | * Returns a reference to the VirtualBox object.
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| 142 | *
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| 143 | * @returns COM status code
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| 144 | * @param aVirtualBox Address of result variable.
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| 145 | */
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| 146 | STDMETHODIMP VirtualBoxClient::COMGETTER(VirtualBox)(IVirtualBox **aVirtualBox)
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| 147 | {
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| 148 | CheckComArgOutPointerValid(aVirtualBox);
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| 149 |
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| 150 | AutoCaller autoCaller(this);
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| 151 | if (FAILED(autoCaller.rc())) return autoCaller.rc();
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| 152 |
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| 153 | AutoReadLock alock(this COMMA_LOCKVAL_SRC_POS);
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| 154 | mData.m_pVirtualBox.queryInterfaceTo(aVirtualBox);
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| 155 | return S_OK;
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| 156 | }
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| 157 |
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| 158 | /**
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| 159 | * Create a new Session object and return a reference to it.
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| 160 | *
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| 161 | * @returns COM status code
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| 162 | * @param aSession Address of result variable.
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| 163 | */
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| 164 | STDMETHODIMP VirtualBoxClient::COMGETTER(Session)(ISession **aSession)
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| 165 | {
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| 166 | HRESULT rc;
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| 167 | CheckComArgOutPointerValid(aSession);
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| 168 |
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| 169 | AutoCaller autoCaller(this);
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| 170 | if (FAILED(autoCaller.rc())) return autoCaller.rc();
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| 171 |
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| 172 | /* this is not stored in this object, no need to lock */
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| 173 | ComPtr<ISession> pSession;
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| 174 | rc = pSession.createInprocObject(CLSID_Session);
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| 175 | if (SUCCEEDED(rc))
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| 176 | pSession.queryInterfaceTo(aSession);
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| 177 |
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| 178 | return rc;
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| 179 | }
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| 180 |
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| 181 | /**
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| 182 | * Return reference to the EventSource associated with this object.
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| 183 | *
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| 184 | * @returns COM status code
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| 185 | * @param aEventSource Address of result variable.
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| 186 | */
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| 187 | STDMETHODIMP VirtualBoxClient::COMGETTER(EventSource)(IEventSource **aEventSource)
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| 188 | {
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| 189 | CheckComArgOutPointerValid(aEventSource);
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| 190 |
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| 191 | AutoCaller autoCaller(this);
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| 192 | if (FAILED(autoCaller.rc())) return autoCaller.rc();
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| 193 |
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| 194 | /* this is const, no need to lock */
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| 195 | mData.m_pEventSource.queryInterfaceTo(aEventSource);
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| 196 |
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| 197 | return mData.m_pEventSource.isNull() ? E_FAIL : S_OK;
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| 198 | }
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| 199 |
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| 200 | // private methods
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| 201 | /////////////////////////////////////////////////////////////////////////////
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| 202 |
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| 203 | /*static*/
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| 204 | DECLCALLBACK(int) VirtualBoxClient::SVCWatcherThread(RTTHREAD ThreadSelf,
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| 205 | void *pvUser)
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| 206 | {
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| 207 | NOREF(ThreadSelf);
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| 208 | Assert(pvUser);
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| 209 | VirtualBoxClient *pThis = (VirtualBoxClient *)pvUser;
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| 210 | RTSEMEVENT sem = pThis->mData.m_SemEvWatcher;
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| 211 | RTMSINTERVAL cMillies = VBOXCLIENT_DEFAULT_INTERVAL;
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| 212 | int vrc;
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| 213 |
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| 214 | /* The likelihood of early crashes are high, so start with a short wait. */
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| 215 | vrc = RTSemEventWait(sem, cMillies / 2);
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| 216 |
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| 217 | /* As long as the waiting times out keep retrying the wait. */
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| 218 | while (RT_FAILURE(vrc))
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| 219 | {
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| 220 | {
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| 221 | HRESULT rc = S_OK;
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| 222 | ComPtr<IVirtualBox> pV;
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| 223 | {
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| 224 | AutoReadLock alock(pThis COMMA_LOCKVAL_SRC_POS);
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| 225 | pV = pThis->mData.m_pVirtualBox;
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| 226 | }
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| 227 | if (!pV.isNull())
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| 228 | {
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| 229 | ULONG rev;
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| 230 | rc = pV->COMGETTER(Revision)(&rev);
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| 231 | if (FAILED_DEAD_INTERFACE(rc))
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| 232 | {
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| 233 | LogRel(("VirtualBoxClient: detected unresponsive VBoxSVC (rc=%Rhrc)\n", rc));
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| 234 | {
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| 235 | AutoWriteLock alock(pThis COMMA_LOCKVAL_SRC_POS);
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| 236 | /* Throw away the VirtualBox reference, it's no longer
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| 237 | * usable as VBoxSVC terminated in the mean time. */
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| 238 | pThis->mData.m_pVirtualBox.setNull();
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| 239 | }
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| 240 | fireVBoxSVCAvailabilityChangedEvent(pThis->mData.m_pEventSource, FALSE);
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| 241 | }
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| 242 | }
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| 243 | else
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| 244 | {
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| 245 | /* Try to get a new VirtualBox reference straight away, and if
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| 246 | * this fails use an increased waiting time as very frequent
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| 247 | * restart attempts in some wedged config can cause high CPU
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| 248 | * and disk load. */
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| 249 | ComPtr<IVirtualBox> pVBox;
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| 250 | rc = pVBox.createLocalObject(CLSID_VirtualBox);
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| 251 | if (FAILED(rc))
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| 252 | cMillies = 3 * VBOXCLIENT_DEFAULT_INTERVAL;
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| 253 | else
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| 254 | {
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| 255 | LogRel(("VirtualBoxClient: detected working VBoxSVC (rc=%Rhrc)\n", rc));
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| 256 | {
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| 257 | AutoWriteLock alock(pThis COMMA_LOCKVAL_SRC_POS);
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| 258 | /* Update the VirtualBox reference, there's a working
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| 259 | * VBoxSVC again from now on. */
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| 260 | pThis->mData.m_pVirtualBox = pVBox;
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| 261 | }
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| 262 | fireVBoxSVCAvailabilityChangedEvent(pThis->mData.m_pEventSource, TRUE);
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| 263 | cMillies = VBOXCLIENT_DEFAULT_INTERVAL;
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| 264 | }
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| 265 | }
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| 266 | }
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| 267 | vrc = RTSemEventWait(sem, cMillies);
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| 268 | }
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| 269 | return 0;
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| 270 | }
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| 271 |
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| 272 | /* vi: set tabstop=4 shiftwidth=4 expandtab: */
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