* RVolumeList:

- Added locking, listener support.
  - Changed message handling from BHandler to MessageHandler interface.
  - Fixed bugs.
* RDiskDeviceList:
  - Locking uses an external lock now (the same one as the volume list)
  - Prepared for message handling (MessageHandler).
* DiskDeviceManager:
  - Added priority message queue and message handler thread -- should be
    more or less complete now.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@2644 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/servers/registrar/DiskDeviceManager.cpp

@@ -3,28 +3,49 @@
 //  by the OpenBeOS license.
 //---------------------------------------------------------------------
 
+#include <NodeMonitor.h>
 #include <RegistrarDefs.h>
 
 #include "DiskDeviceManager.h"
 
+enum {
+	REQUEST_PRIORITY		= 0,
+	NODE_MONITOR_PRIORITY	= 10,
+};
+
 // constructor
 DiskDeviceManager::DiskDeviceManager()
 	: BLooper("disk device manager"),
-	  fDeviceList(),
-	  fVolumeList()
+	  fDeviceListLock(),
+	  fVolumeList(BMessenger(this), fDeviceListLock),
+	  fDeviceList(BMessenger(this), fDeviceListLock, fVolumeList),
+	  fMessageQueue(),
+	  fWorker(-1),
+	  fMessageCounter(-1),
+	  fTerminating(false)
 {
-	AddHandler(&fVolumeList);
+	// set up the device list
+	fVolumeList.Rescan();
 	fVolumeList.Dump();
 	fDeviceList.Rescan();
 	fDeviceList.Dump();
+	// start the worker thread
+	fMessageCounter = create_sem(0, "disk device manager msgcounter");
+	if (fMessageCounter >= 0) {
+		fWorker = spawn_thread(_WorkerEntry, "disk device manager worker",
+							   B_NORMAL_PRIORITY, this);
+		if (fWorker >= 0)
+			resume_thread(fWorker);
+	}
 }
 
 // destructor
 DiskDeviceManager::~DiskDeviceManager()
 {
-	Lock();
-	RemoveHandler(&fVolumeList);
-	Unlock();
+	fTerminating = true;
+	delete_sem(fMessageCounter);
+	int32 dummy;
+	wait_for_thread(fWorker, &dummy);
 }
 
 // MessageReceived
@@ -37,6 +58,14 @@ DiskDeviceManager::MessageReceived(BMessage *message)
 		case B_REG_UPDATE_DISK_DEVICE:
 		case B_REG_DEVICE_START_WATCHING:
 		case B_REG_DEVICE_STOP_WATCHING:
+			DetachCurrentMessage();
+			if (!_PushMessage(message, REQUEST_PRIORITY))
+				delete message;
+			break;
+		case B_NODE_MONITOR:
+			DetachCurrentMessage();
+			if (!_PushMessage(message, NODE_MONITOR_PRIORITY))
+				delete message;
 			break;
 		default:
 			BLooper::MessageReceived(message);
@@ -44,3 +73,69 @@ DiskDeviceManager::MessageReceived(BMessage *message)
 	}
 }
 
+// _PushMessage
+bool
+DiskDeviceManager::_PushMessage(BMessage *message, int32 priority)
+{
+	bool result = fMessageQueue.PushMessage(message, priority);
+	if (result)
+		release_sem(fMessageCounter);
+	return result;
+}
+
+// _PopMessage
+BMessage *
+DiskDeviceManager::_PopMessage()
+{
+	BMessage *result = NULL;
+	status_t error = acquire_sem(fMessageCounter);
+	if (error == B_OK)
+		result = fMessageQueue.PopMessage();
+	return result;
+}
+
+// _WorkerEntry
+int32
+DiskDeviceManager::_WorkerEntry(void *parameters)
+{
+	return static_cast<DiskDeviceManager*>(parameters)->_Worker();
+}
+
+// _Worker
+int32
+DiskDeviceManager::_Worker()
+{
+	while (!fTerminating) {
+		if (BMessage *message = _PopMessage()) {
+			// dispatch the message
+			switch (message->what) {
+				case B_REG_NEXT_DISK_DEVICE:
+				case B_REG_GET_DISK_DEVICE:
+				case B_REG_UPDATE_DISK_DEVICE:
+				case B_REG_DEVICE_START_WATCHING:
+				case B_REG_DEVICE_STOP_WATCHING:
+					fDeviceList.HandleMessage(message);
+					break;
+				case B_NODE_MONITOR:
+				{
+					int32 opcode = 0;
+					if (message->FindInt32("opcode", &opcode) == B_OK) {
+						if (opcode == B_DEVICE_MOUNTED
+							|| opcode == B_DEVICE_UNMOUNTED) {
+							fVolumeList.HandleMessage(message);
+						} else {
+							fDeviceList.HandleMessage(message);
+						}
+					}
+					break;
+				}
+				default:
+					// error
+					break;
+			}
+			delete message;
+		}
+	}
+	return 0;
+}
+

src/servers/registrar/DiskDeviceManager.h

@@ -6,8 +6,11 @@
 #ifndef DISK_DEVICE_MANAGER_H
 #define DISK_DEVICE_MANAGER_H
 
+#include <Locker.h>
 #include <Looper.h>
+#include <OS.h>
 
+#include "PriorityMessageQueue.h"
 #include "RDiskDeviceList.h"
 #include "RVolumeList.h"
 
@@ -19,8 +22,20 @@ public:
 	virtual void MessageReceived(BMessage *message);
 
 private:
-	RDiskDeviceList	fDeviceList;
-	RVolumeList		fVolumeList;
+	bool _PushMessage(BMessage *message, int32 priority);
+	BMessage *_PopMessage();
+
+	static int32 _WorkerEntry(void *parameters);
+	int32 _Worker();
+
+private:
+	BLocker					fDeviceListLock;
+	RVolumeList				fVolumeList;
+	RDiskDeviceList			fDeviceList;
+	PriorityMessageQueue	fMessageQueue;
+	thread_id				fWorker;
+	sem_id					fMessageCounter;
+	bool					fTerminating;
 };
 
 #endif	// DISK_DEVICE_MANAGER_H

src/servers/registrar/RDiskDeviceList.cpp

@@ -14,7 +14,7 @@
 #include <Directory.h>
 #include <Drivers.h>
 #include <Entry.h>
-//#include <ObjectLocker.h>
+#include <Locker.h>
 #include <Path.h>
 
 #include "RDiskDeviceList.h"
@@ -72,12 +72,18 @@ private:
 };
 
 // constructor
-RDiskDeviceList::RDiskDeviceList()
-	: fLock(),
+RDiskDeviceList::RDiskDeviceList(BMessenger target, BLocker &lock,
+								 RVolumeList &volumeList)
+	: MessageHandler(),
+	  RVolumeListListener(),
+	  fLock(lock),
+	  fTarget(target),
+	  fVolumeList(volumeList),
 	  fDevices(20, true),
 	  fSessions(40, false),
 	  fPartitions(80, false)
 {
+	fVolumeList.SetListener(this);
 }
 
 // destructor
@@ -85,6 +91,34 @@ RDiskDeviceList::~RDiskDeviceList()
 {
 }
 
+// HandleMessage
+void
+RDiskDeviceList::HandleMessage(BMessage *message)
+{
+	if (Lock()) {
+		switch (message->what) {
+			default:
+				MessageHandler::HandleMessage(message);
+				break;
+		}
+		Unlock();
+	}
+}
+
+// VolumeMounted
+void
+RDiskDeviceList::VolumeMounted(const RVolume *volume)
+{
+	PRINT(("RDiskDeviceList::VolumeMounted(%ld)\n", volume->ID()));
+}
+
+// VolumeUnmounted
+void
+RDiskDeviceList::VolumeUnmounted(const RVolume *volume)
+{
+	PRINT(("RDiskDeviceList::VolumeUnmounted(%ld)\n", volume->ID()));
+}
+
 // AddDevice
 bool
 RDiskDeviceList::AddDevice(RDiskDevice *device)

src/servers/registrar/RDiskDeviceList.h

@@ -6,21 +6,30 @@
 #ifndef DISK_DEVICE_LIST_H
 #define DISK_DEVICE_LIST_H
 
-#include <Locker.h>
+#include <Messenger.h>
 #include <ObjectList.h>
 
+#include "MessageHandler.h"
+#include "RVolumeList.h"
+
 class BDirectory;
 class BEntry;
+class BLocker;
 
 class RDiskDevice;
 class RPartition;
 class RSession;
 
-class RDiskDeviceList {
+class RDiskDeviceList : public MessageHandler, public RVolumeListListener {
 public:
-	RDiskDeviceList();
+	RDiskDeviceList(BMessenger target, BLocker &lock, RVolumeList &volumeList);
 	~RDiskDeviceList();
 
+	virtual void HandleMessage(BMessage *message);
+
+	void RDiskDeviceList::VolumeMounted(const RVolume *volume);
+	void RDiskDeviceList::VolumeUnmounted(const RVolume *volume);
+
 	bool AddDevice(RDiskDevice *device);
 	bool RemoveDevice(int32 index);
 	bool RemoveDevice(RDiskDevice *device);
@@ -59,7 +68,9 @@ private:
 	status_t _ScanDevice(const char *path);
 
 private:
-	BLocker						fLock;
+	mutable BLocker				&fLock;
+	BMessenger					fTarget;
+	RVolumeList					&fVolumeList;
 	BObjectList<RDiskDevice>	fDevices;		// sorted by ID
 	BObjectList<RSession>		fSessions;		//
 	BObjectList<RPartition>		fPartitions;	//

src/servers/registrar/RVolumeList.cpp

@@ -5,6 +5,7 @@
 
 #include <string.h>
 
+#include <Locker.h>
 #include <Message.h>
 #include <NodeMonitor.h>
 #include <Volume.h>
@@ -79,66 +80,84 @@ RVolume::Unset()
 }
 
 
+// RVolumeListListener
+
+// constructor
+RVolumeListListener::RVolumeListListener()
+{
+}
+
+// destructor
+RVolumeListListener::~RVolumeListListener()
+{
+}
+
+// VolumeMounted
+void
+RVolumeListListener::VolumeMounted(const RVolume *volume)
+{
+}
+
+// VolumeUnmounted
+void
+RVolumeListListener::VolumeUnmounted(const RVolume *volume)
+{
+}
+
+
 // RVolumeList
 
 // constructor
-RVolumeList::RVolumeList()
-	: BHandler(),
+RVolumeList::RVolumeList(BMessenger target, BLocker &lock)
+	: MessageHandler(),
+	  fLock(lock),
+	  fTarget(target),
 	  fVolumes(20, true),
-	  fRoster()
+	  fRoster(),
+	  fListener(NULL)
 {
+// TODO: Remove work-around. At this time R5 libbe's watching functions don't
+// work for us. We have an own implementation in `NodeMonitoring.cpp'.
+//		fRoster.StartWatching(BMessenger(this));
+		watch_node(NULL, B_WATCH_MOUNT, fTarget);
+		Rescan();
 }
 
 // destructor
 RVolumeList::~RVolumeList()
 {
-}
-
-// MessageReceived
-void
-RVolumeList::MessageReceived(BMessage *message)
-{
-	switch (message->what) {
-		case B_NODE_MONITOR:
-		{
-			int32 opcode = 0;
-			if (message->FindInt32("opcode", &opcode) == B_OK) {
-				switch (opcode) {
-					case B_DEVICE_MOUNTED:
-						_DeviceMounted(message);
-						break;
-					case B_DEVICE_UNMOUNTED:
-						_DeviceUnmounted(message);
-						break;
-				}
-			}
-			break;
-		}
-		default:
-			BHandler::MessageReceived(message);
-			break;
-	}
-}
-
-// SetNextHandler
-void
-RVolumeList::SetNextHandler(BHandler *handler)
-{
-	// stop watching volumes, if removed from looper
-	if (!handler) {
 // TODO: Remove work-around. At this time R5 libbe's watching functions don't
 // work for us. We have an own implementation in `NodeMonitoring.cpp'.
 //		fRoster.StopWatching();
-		stop_watching(BMessenger(this));
-	}
-	BHandler::SetNextHandler(handler);
-	// start watching volumes and rescan list, if added to looper
-	if (handler) {
-// TODO: Remove work-around. At this time R5 libbe's watching functions don't
-// work for us. We have an own implementation in `NodeMonitoring.cpp'.
-//		fRoster.StartWatching(BMessenger(this));
-		watch_node(NULL, B_WATCH_MOUNT, BMessenger(this));
-		Rescan();
+		stop_watching(fTarget);
+}
+
+// HandleMessage
+void
+RVolumeList::HandleMessage(BMessage *message)
+{
+	if (Lock()) {
+		switch (message->what) {
+			case B_NODE_MONITOR:
+			{
+				int32 opcode = 0;
+				if (message->FindInt32("opcode", &opcode) == B_OK) {
+					switch (opcode) {
+						case B_DEVICE_MOUNTED:
+							_DeviceMounted(message);
+							break;
+						case B_DEVICE_UNMOUNTED:
+							_DeviceUnmounted(message);
+							break;
+					}
+				}
+				break;
+			}
+			default:
+				MessageHandler::HandleMessage(message);
+				break;
+		}
+		Unlock();
 	}
 }
 
@@ -158,23 +177,37 @@ RVolumeList::Rescan()
 const RVolume *
 RVolumeList::VolumeForDevicePath(const char *devicePath) const
 {
-// TODO: ...
-	return NULL;
+	const RVolume *volume = NULL;
+	if (devicePath && fLock.Lock()) {
+		bool found = false;
+		int32 index = fVolumes.FindBinaryInsertionIndex(
+			CompareDevicePathPredicate(devicePath), &found);
+		if (found)
+			volume = fVolumes.ItemAt(index);
+		fLock.Unlock();
+	}
+	return volume;
 }
 
 // Lock
 bool
 RVolumeList::Lock()
 {
-// TODO: ...
-	return false;
+	return fLock.Lock();
 }
 
 // Unlock
 void
 RVolumeList::Unlock()
 {
-// TODO: ...
+	fLock.Unlock();
+}
+
+// SetListener
+void
+RVolumeList::SetListener(RVolumeListListener *listener)
+{
+	fListener = listener;
 }
 
 // Dump
@@ -189,21 +222,24 @@ RVolumeList::Dump() const
 }
 
 // _AddVolume
-void
+RVolume *
 RVolumeList::_AddVolume(dev_t id)
 {
-	if (RVolume *volume = new RVolume) {
+	RVolume *volume = new RVolume;
+	if (volume) {
 		status_t error = volume->SetTo(id);
 		if (error == B_OK) {
 			fVolumes.BinaryInsert(volume,
 				CompareDevicePathPredicate(volume->DevicePath()));
 		} else {
 			delete volume;
+			volume = NULL;
 			PRINT(("RVolumeList::_AddVolume(): initializing RVolume failed: "
 				   "%s\n", strerror(error)));
 		}
 	} else
 		PRINT(("RVolumeList::_AddVolume(): no memory!\n"));
+	return volume;
 }
 
 // _DeviceMounted
@@ -213,7 +249,10 @@ RVolumeList::_DeviceMounted(BMessage *message)
 	dev_t device;
 	if (message->FindInt32("new device", &device) == B_OK) {
 		PRINT(("RVolumeList::_DeviceMounted(%ld)\n", device));
-		_AddVolume(device);
+		if (RVolume *volume = _AddVolume(device)) {
+			if (fListener)
+				fListener->VolumeMounted(volume);
+		}
 	}
 }
 
@@ -224,8 +263,12 @@ RVolumeList::_DeviceUnmounted(BMessage *message)
 	dev_t device;
 	if (message->FindInt32("device", &device) == B_OK) {
 		PRINT(("RVolumeList::_DeviceUnmounted(%ld)\n", device));
-		if (RVolume *volume = fVolumes.FindIf(CompareIDPredicate(volume)))
-			fVolumes.RemoveItem(volume);
+		if (RVolume *volume = fVolumes.FindIf(CompareIDPredicate(device))) {
+			fVolumes.RemoveItem(volume, false);
+			if (fListener)
+				fListener->VolumeUnmounted(volume);
+			delete volume;
+		}
 	}
 }
 

src/servers/registrar/RVolumeList.h

@@ -6,11 +6,15 @@
 #ifndef VOLUME_LIST_H
 #define VOLUME_LIST_H
 
-#include <Handler.h>
+#include <Messenger.h>
 #include <Node.h>
 #include <ObjectList.h>
 #include <VolumeRoster.h>
 
+#include "MessageHandler.h"
+
+class BLocker;
+
 // RVolume
 class RVolume {
 public:
@@ -32,14 +36,23 @@ private:
 	char	fDevicePath[B_FILE_NAME_LENGTH];
 };
 
-// RVolumeList
-class RVolumeList : public BHandler {
+// RVolumeListListener
+class RVolumeListListener {
 public:
-	RVolumeList();
+	RVolumeListListener();
+	virtual ~RVolumeListListener();
+
+	virtual void VolumeMounted(const RVolume *volume);
+	virtual void VolumeUnmounted(const RVolume *volume);
+};
+
+// RVolumeList
+class RVolumeList : public MessageHandler {
+public:
+	RVolumeList(BMessenger target, BLocker &lock);
 	virtual ~RVolumeList();
 
-	virtual void MessageReceived(BMessage *message);
-	virtual void SetNextHandler(BHandler *handler);
+	virtual void HandleMessage(BMessage *message);
 
 	status_t Rescan();
 
@@ -48,16 +61,21 @@ public:
 	bool Lock();
 	void Unlock();
 
+	void SetListener(RVolumeListListener *listener);
+
 	void Dump() const;
 
 private:
-	void _AddVolume(dev_t id);
+	RVolume *_AddVolume(dev_t id);
 	void _DeviceMounted(BMessage *message);
 	void _DeviceUnmounted(BMessage *message);
 
 private:
+	mutable BLocker			&fLock;
+	BMessenger				fTarget;
 	BObjectList<RVolume>	fVolumes;
 	BVolumeRoster			fRoster;
+	RVolumeListListener		*fListener;
 };
 
 #endif	// VOLUME_LIST_H