C++ IOLockUnlock函数代码示例

void AppleGPIO::unregisterWithParent(void)
{
	// grab the mutex
	IOLockLock(fAmRegisteredLock);

	if (!fAmRegistered)
	{
		DLOG("AppleGPIO::unregisterWithParent not registered!!\n");
		IOLockUnlock(fAmRegisteredLock);
		return;
	}

	if (fParent->callPlatformFunction(kSymGPIOParentUnregister, false,
			(void *)fGPIOID, (void *)getProvider(),
			(void *)&sGPIOEventOccured,	(void *)this) == kIOReturnSuccess)
	{
		fAmRegistered = false;
	}
	else
	{
		DLOG("AppleGPIO::unregisterWithParent failed to unregister\n");
	}

	// release the mutex
	IOLockUnlock(fAmRegisteredLock);
}

void
SCSIPressurePathManager::ExecuteCommand ( SCSITaskIdentifier request )
{
	
	SCSITargetDevicePath *		path		= NULL;
	PortBandwidthGlobals *		bw			= NULL;
	UInt32						numPaths	= 0;
	
	IOLockLock ( fLock );
	
	numPaths = fPathSet->getCount ( );
	
	if ( numPaths == 0 )
	{
		
		IOLockUnlock ( fLock );
		PathTaskCallback ( request );
		return;
		
	}
	
	bw = PortBandwidthGlobals::GetSharedInstance ( );
	path = bw->AllocateBandwidth ( fPathSet, GetRequestedDataTransferCount ( request ) );
	
	IOLockUnlock ( fLock );
	
	SetPathLayerReference ( request, ( void * ) path );
	path->GetInterface ( )->ExecuteCommand ( request );
	
}

errno_t	IOWebFilterClass::tl_data_in_func(void *cookie, socket_t so,
                                          const struct sockaddr *from, mbuf_t *data, mbuf_t *control,
                                          sflt_data_flag_t flags)
{
    SocketTracker *tracker = (SocketTracker*)cookie;

//    __asm__("int3");

    LOG(LOG_DEBUG, "I am in, %s, magic=%ld", tracker->proc_name, tracker->magic);

    if(tracker==NULL || data==NULL || (tracker->magic&(kSocketTrackerInvalid|kSocketTrackerDetach))!=0)
    {
        LOG(LOG_DEBUG, "in return process");
        return 0;
    }
    if(tracker->lock==NULL)
    {
        tracker->magic=kSocketTrackerInvalid;
        return 0;
    }

    IOLockLock(tracker->lock);
    mbuf_t head = *data;
    uint64_t len=0;

    if(head==NULL)
    {
        tracker->magic=kSocketTrackerInvalid;
        IOLockUnlock(tracker->lock);
        return 0;
    }

    while(head)
    {
        len += mbuf_len(head);
        head = mbuf_next(head);
    }

    if(len>sizeof(tracker->request_meg)-1)
    {
        tracker->magic=kSocketTrackerInvalid;
        IOLockUnlock(tracker->lock);
        return 0;
    }
    bzero(tracker->request_meg, sizeof(tracker->request_meg));
    mbuf_copydata(*data, 0, len, tracker->request_meg);

    //todo: sync to shared memory， record a new request
    if(_queue)
    {
        LOG(LOG_DEBUG, "enter queue");
        _queue->EnqueueTracker((DataArgs*)tracker);
    }

    IOLockUnlock(tracker->lock);
    return 0;
}

void
SCSIPressurePathManager::ActivatePath ( IOSCSIProtocolServices * interface )
{
	
	bool					result 	= false;
	SCSITargetDevicePath *	path	= NULL;
	
	STATUS_LOG ( ( "SCSIPressurePathManager::ActivatePath\n" ) );
	
	require_nonzero ( interface, ErrorExit );
	
	IOLockLock ( fLock );
	
	result = fInactivePathSet->member ( interface );
	if ( result == true )
	{
		
		path = fInactivePathSet->getObjectWithInterface ( interface );
		if ( path != NULL )
		{
			
			path->retain ( );
			path->Activate ( );
			fInactivePathSet->removeObject ( interface );
			fPathSet->setObject ( path );
			path->release ( );
			path = NULL;
			
		}
		
	}
	
	else
	{
		
		result = fPathSet->member ( interface );
		if ( result == false )
		{
			
			IOLockUnlock ( fLock );
			AddPath ( interface );
			goto Exit;
			
		}
		
	}
	
	IOLockUnlock ( fLock );
	
	
ErrorExit:
Exit:
	
	
	return;
	
}

void IOHIKeyboard::dispatchKeyboardEvent(unsigned int keyCode,
			 /* direction */ bool         goingDown,
                         /* timeStamp */ AbsoluteTime time)
// Description:	This method is the heart of event dispatching. The overlying
//		subclass invokes this method with each event. We then
//		get the event xlated and dispatched using a _keyMap instance.
//		The event structure passed in by reference should not be freed.
{
    IOHIKeyboardMapper	* theKeyMap;
    KeyboardReserved *tempReservedStruct = GetKeyboardReservedStructEventForService(this); 
	
    IOLockLock( _deviceLock);

    _lastEventTime = time;

    // Post the event to the HID Manager
    if (tempReservedStruct)
    {
        if (tempReservedStruct->keyboardNub )
        {
            tempReservedStruct->keyboardNub->postKeyboardEvent(keyCode, goingDown);
        }
        
        if (tempReservedStruct->isSeized)
        {
            IOLockUnlock( _deviceLock);
            return;
        }
    }


    if (tempReservedStruct) tempReservedStruct->dispatchEventCalled = true;

    if (_keyMap)  _keyMap->translateKeyCode(keyCode,
			  /* direction */ goingDown,
			  /* keyBits */   _keyState);
			  
    // remember the keymap while we hold the lock
    theKeyMap = _keyMap;

    if (tempReservedStruct) tempReservedStruct->dispatchEventCalled = false;
	
    IOLockUnlock( _deviceLock);
	
	// outside the lock (because of possible recursion), give the
	// keymap a chance to do some post processing
	// since it is possible we will be entered reentrantly and 
	// release the keymap, we will add a retain here.
    if (theKeyMap)
	{
		theKeyMap->retain();
		theKeyMap->keyEventPostProcess();
		theKeyMap->release();
	}
}

IOReturn SPFramebuffer::disable() {
    IOLockLock(lock);
    if (!isEnabled) {
        IOLockUnlock(lock);
        return kIOReturnNotOpen;
    }
    isEnabled = false;
    connectChangeInterrupt(this, NULL);
    IOLockUnlock(lock);
    return kIOReturnSuccess;
}

IOReturn IOSharedInterruptController::unregisterInterrupt(IOService *nub,
							  int source)
{
  IOInterruptVectorNumber vectorNumber;
  IOInterruptVector *vector;
  IOInterruptState  interruptState;

  for (vectorNumber = 0; vectorNumber < kIOSharedInterruptControllerDefaultVectors; vectorNumber++) {
    vector = &vectors[vectorNumber];

    // Get the lock for this vector.
    IOLockLock(vector->interruptLock);

    // Return success if it is not already registered
    if (!vector->interruptRegistered
     || (vector->nub != nub) || (vector->source != source)) {
        IOLockUnlock(vector->interruptLock);
        continue;
    }

    // Soft disable the source and the controller too.
    disableInterrupt(nub, source);

    // Clear all the storage for the vector except for interruptLock.
    vector->interruptActive = 0;
    vector->interruptDisabledSoft = 0;
    vector->interruptDisabledHard = 0;
    vector->interruptRegistered = 0;
    vector->nub = 0;
    vector->source = 0;
    vector->handler = 0;
    vector->target = 0;
    vector->refCon = 0;

    interruptState = IOSimpleLockLockDisableInterrupt(controllerLock);
    vectorsRegistered--;
    IOSimpleLockUnlockEnableInterrupt(controllerLock, interruptState);

    // Move along to the next one.
    IOLockUnlock(vector->interruptLock);
  }

  // Re-enable the controller if all vectors are enabled.
  if (vectorsEnabled == vectorsRegistered) {
    controllerDisabled = 0;
    provider->enableInterrupt(0);
  }

  return kIOReturnSuccess;
}

 static void free(IOLock*& lock) {
   IOLockLock(lock);
   IOLock* tmplock = lock;
   lock = NULL;
   IOLockUnlock(tmplock);
   IOLockFree(tmplock);
 }

void IOHIKeyboard::free()
// Description:	Go Away. Be careful when freeing the lock.
{
    IOLock * lock = NULL;

    if ( _deviceLock )
    {
      lock = _deviceLock;
      IOLockLock( lock);
      _deviceLock = NULL;
    }

    if ( _keyMap ) {
        _keyMap->release();
    }

    if( _keyState )
        IOFree( _keyState, _keyStateSize);

    // RY: MENTAL NOTE Do this last
    if ( lock )
    {
      IOLockUnlock( lock);
      IOLockFree( lock);
    }
    
    super::free();
}

void IOAccelerationUserClient::stop( IOService * provider )
{
    IOAccelIDRecord * record;

    IOLockLock(gLock);

    while (!queue_empty( &fTaskList ))
    {
        queue_remove_first( &fTaskList,
                            record,
                            IOAccelIDRecord *,
                            task_link );

        if (--record->retain)
            record->task_link.next = 0;
        else
        {
            queue_remove(&gGlobalList,
                            record,
                            IOAccelIDRecord *,
                            glob_link);
            gTotalCount--;
            IODelete(record, IOAccelIDRecord, 1);
        }
    }
    IOLockUnlock(gLock);

    super::stop( provider );
}

void
IOFWUserAsyncStreamListener::deactivate()
{
	IOFWAsyncStreamListener::TurnOffNotification() ;
	
	IOLockLock(fLock) ;
	
	fBufferAvailable = 0 ;	// zzz do we need locking here to protect our data?
	fLastReadHeader = NULL ;	
	
	IOFWPacketHeader*	firstHeader = fLastWrittenHeader ;
	IOFWPacketHeader*	tempHeader ;

	if (fLastWrittenHeader)
	{
		while (fLastWrittenHeader->CommonHeader.next != firstHeader)
		{
			tempHeader = fLastWrittenHeader->CommonHeader.next ;
			delete fLastWrittenHeader ;
			fLastWrittenHeader = tempHeader ;	
		}
	
	}
		
	fWaitingForUserCompletion = false ;
	
	IOLockUnlock(fLock) ;
}

int
Rules::DeactivateRule(UInt32 ruleId)
{
    int result = -1;

    IOLockLock(lock);
    Rule* workRule = this->root;
    while (workRule)
    {
        if(workRule->id == ruleId)
        {
            if(workRule->state == RuleStateInactive)
            {
                workRule->state = RuleStateActive;
                clock_get_uptime(&lastChangedTime);
                result = 0;
            }
            else
            {
                result = 1;//alredy inactive
            }
            break;
        }

        workRule = workRule->next;
    }

    IOLockUnlock(lock);
    return result;
}

/******************************************************************************
 * ACPIDebug::PrintTraces
 ******************************************************************************/
void ACPIDebug::PrintTraces()
{
    IOLockLock(m_pLock);

    for (;;)
    {
        // see if there are any trace items in the RING
        UInt32 count = 0;
        if (kIOReturnSuccess != m_pDevice->evaluateInteger("COUN", &count))
        {
            IOLog("ACPIDebug: evaluateObject of COUN method failed\n");
            break;
            
        }
        if (!count)
            break;
        
        // gather the next item from RING and print it
        OSObject* debug;
        if (kIOReturnSuccess == m_pDevice->evaluateObject("FTCH", &debug) &&
            NULL != debug)
        {
            static char buf[2048];
            // got a valid object, format and print it...
            FormatDebugString(debug, buf, sizeof(buf)/sizeof(buf[0]));
            IOLog("ACPIDebug: %s\n", buf);
            debug->release();
        }
    }

    IOLockUnlock(m_pLock);
}

void BrcmPatchRAM::scheduleWork(unsigned int newWork)
{
    IOLockLock(mWorkLock);
    mWorkPending |= newWork;
    mWorkSource->interruptOccurred(0, 0, 0);
    IOLockUnlock(mWorkLock);
}

/* static */
void
OSMetaClass::printInstanceCounts()
{
    OSCollectionIterator * classes;
    OSSymbol             * className;
    OSMetaClass          * meta;

    IOLockLock(sAllClassesLock);
    classes = OSCollectionIterator::withCollection(sAllClassesDict);
    assert(classes);

    while( (className = (OSSymbol *)classes->getNextObject())) {
        meta = (OSMetaClass *)sAllClassesDict->getObject(className);
        assert(meta);

        printf("%24s count: %03d x 0x%03x = 0x%06x\n",
            className->getCStringNoCopy(),
            meta->getInstanceCount(),
            meta->getClassSize(),
            meta->getInstanceCount() * meta->getClassSize() );
    }
    printf("\n");
    classes->release();
    IOLockUnlock(sAllClassesLock);
    return;
}