Lazy<T>, LazyTLS<T>, thread dtors

BeefLibs/corlib/src/Lazy.bf

@@ -0,0 +1,288 @@
+using System.Threading;
+
+namespace System
+{
+	enum LazyThreadMode
+	{
+		None,
+		Lock,
+		Lockless
+	}
+
+	class Lazy<T>
+	{
+		protected struct Entry
+		{
+			public SelfOuter mSingleton;
+			public T mValue;
+		}
+
+		protected Monitor mMonitor ~ delete _;
+		protected LazyThreadMode mThreadMode;
+		protected volatile int mInitId;
+		protected T mValue;
+		delegate T() mCreateDlg ~ delete _;
+		delegate void(T value) mReleaseDlg ~ delete _;
+
+		public this()
+		{
+			
+		}
+
+		public this(LazyThreadMode threadMode)
+		{
+			mThreadMode = threadMode;
+			Init();
+		}
+
+		public this(LazyThreadMode threadMode, delegate T() createDlg = null, delegate void(T value) releaseDlg = null)
+		{
+			mThreadMode = threadMode;
+			mCreateDlg = createDlg;
+			mReleaseDlg = releaseDlg;
+			Init();
+		}
+
+		public this(delegate void(T value) releaseDlg) : this()
+		{
+			mReleaseDlg = releaseDlg;
+		}
+
+		void Init()
+		{
+			switch (mThreadMode)
+			{
+			case .None:
+			case .Lock:
+				mMonitor = new Monitor();
+			case .Lockless:
+			}
+			
+		}
+
+		public ~this()
+		{
+			ReleaseValue(mut mValue);
+		}
+
+		protected T DefaultCreateValue()
+		{
+			return default;
+		}
+
+		protected T DefaultCreateValue() where T : struct, new
+		{
+			return T();
+		}
+
+		protected T DefaultCreateValue() where T : class
+		{
+			Runtime.FatalError("No create delegate specified and no public default constructor is available");
+		}
+
+		protected T DefaultCreateValue() where T : class, new
+		{
+			return new T();
+		}
+
+		protected virtual T CreateValue()
+		{
+			return DefaultCreateValue();
+		}
+
+		protected void DefaultReleaseValue(mut T val)
+		{
+
+		}
+
+		protected void DefaultReleaseValue(mut T val) where T : struct, IDisposable
+		{
+			val.Dispose();
+		}
+
+		protected void DefaultReleaseValue(mut T val) where T : class
+		{
+			delete (Object)val;
+		}
+
+		protected virtual void ReleaseValue(mut T val)
+		{
+			DefaultReleaseValue(mut val);
+		}
+
+		public ref T Value
+		{
+			get
+			{
+				if (mInitId == -1)
+					return ref mValue;
+
+				switch (mThreadMode)
+				{
+				case .None:
+					mValue = CreateValue();
+				case .Lock:
+					using (mMonitor.Enter())
+					{
+						if (mInitId != -1)
+						{
+							mValue = CreateValue();
+							Interlocked.Fence();
+							mInitId = -1;
+						}
+					}
+				case .Lockless:
+					int threadId = Thread.CurrentThreadId;
+					while (true)
+					{
+						int initId = Interlocked.CompareExchange(ref mInitId, 0, threadId);
+						if (initId == -1)
+							break;
+
+						if (initId == 0)
+						{
+							Interlocked.Fence();
+							mValue = CreateValue();
+							Interlocked.Fence();
+							mInitId = -1;
+							break;
+						}
+					}
+				}
+				return ref mValue;
+			}
+		}
+
+		public bool IsValueCreated => mInitId != 0;
+
+		public static ref T operator->(Self self) => ref self.[Inline]Value;
+
+		public override void ToString(String strBuffer)
+		{
+			if (IsValueCreated)
+				strBuffer.AppendF($"Value: {Value}");
+			else
+				strBuffer.AppendF($"No Value");
+		}
+	}
+
+	class LazyTLS<T>
+	{
+		protected struct Entry
+		{
+			public SelfOuter mSingleton;
+			public T mValue;
+		}
+
+		void* mData;
+		delegate T() mCreateDlg ~ delete _;
+		delegate void(T value) mReleaseDlg ~ delete _;
+
+		public this()
+		{
+			InitTLS();
+		}
+
+		public this(delegate T() createDlg = null, delegate void(T value) releaseDlg = null)
+		{
+			mCreateDlg = createDlg;
+			mReleaseDlg = releaseDlg;
+			InitTLS();
+		}
+
+		void InitTLS()
+		{
+			mData = Platform.BfpTLS_Create((ptr) =>
+				{
+					var entry = (Entry*)ptr;
+					if (entry.mSingleton.mReleaseDlg != null)
+						entry.mSingleton.mReleaseDlg(entry.mValue);
+					else
+						entry.mSingleton.ReleaseValue(mut entry.mValue);
+					delete entry;
+				});
+		}
+
+		public ~this()
+		{
+			Platform.BfpTLS_Release((.)mData);
+		}
+
+		protected T DefaultCreateValue()
+		{
+			return default;
+		}
+
+		protected T DefaultCreateValue() where T : struct, new
+		{
+			return T();
+		}
+
+		protected T DefaultCreateValue() where T : class
+		{
+			Runtime.FatalError("No create delegate specified and no public default constructor is available");
+		}
+
+		protected T DefaultCreateValue() where T : class, new
+		{
+			return new T();
+		}
+
+		protected virtual T CreateValue()
+		{
+			return DefaultCreateValue();
+		}
+
+		protected void DefaultReleaseValue(mut T val)
+		{
+
+		}
+
+		protected void DefaultReleaseValue(mut T val) where T : struct, IDisposable
+		{
+			val.Dispose();
+		}
+
+
+		protected void DefaultReleaseValue(mut T val) where T : class
+		{
+			delete (Object)val;
+		}
+
+		protected virtual void ReleaseValue(mut T val)
+		{
+			DefaultReleaseValue(mut val);
+		}
+
+		public ref T Value
+		{
+			get
+			{
+				void* ptr = Platform.BfpTLS_GetValue((.)mData);
+				if (ptr != null)
+					return ref ((Entry*)ptr).mValue;
+
+				Entry* entry = new Entry();
+				entry.mSingleton = this;
+				if (mCreateDlg != null)
+					entry.mValue = mCreateDlg();
+				else
+					entry.mValue = CreateValue();
+				Platform.BfpTLS_SetValue((.)mData, entry);
+				return ref entry.mValue;
+			}
+		}
+
+		public bool IsValueCreated => Platform.BfpTLS_GetValue((.)mData) != null;
+
+		public static ref T operator->(Self self) => ref self.[Inline]Value;
+
+		public override void ToString(String strBuffer)
+		{
+			if (IsValueCreated)
+				strBuffer.AppendF($"Value: {Value}");
+			else
+				strBuffer.AppendF($"No Value");
+		}
+	}
+}

BeefLibs/corlib/src/Platform.bf

@@ -42,6 +42,7 @@ namespace System
 		public struct BfpEvent {};
 		public struct BfpFileWatcher {}
 		public struct BfpProcess {}
+		public struct BfpTLS;
 
 		public enum BfpSystemResult : int32
 		{
@@ -95,6 +96,18 @@ namespace System
 		[CallingConvention(.Stdcall), CLink]
 		public static extern void BfpSystem_GetComputerName(char8* outStr, int32* inOutStrSize, BfpSystemResult* outResult);
 
+		[CallingConvention(.Stdcall), CLink]
+		public static extern int BfpThread_GetCurrentId();
+
+		[CallingConvention(.Stdcall), CLink]
+		public static extern BfpTLS* BfpTLS_Create(function [CallingConvention(.Stdcall)] void(void*) exitProc);
+		[CallingConvention(.Stdcall), CLink]
+		public static extern void BfpTLS_Release(BfpTLS* tls);
+		[CallingConvention(.Stdcall), CLink]
+		public static extern void BfpTLS_SetValue(BfpTLS* tls, void* value);
+		[CallingConvention(.Stdcall), CLink]
+		public static extern void* BfpTLS_GetValue(BfpTLS* tls);
+
 		public enum BfpFileWatcherFlags : int32
 		{
 			None = 0,

BeefLibs/corlib/src/Runtime.bf

@@ -9,7 +9,7 @@ namespace System
 	[StaticInitPriority(101)]
 	static class Runtime
 	{
-		const int32 cVersion = 9;
+		const int32 cVersion = 10;
 
 		[CRepr, AlwaysInclude]
 		struct BfDebugMessageData
@@ -118,6 +118,7 @@ namespace System
 			function bool (Object thread) mThread_IsAutoDelete;
 			function void (Object thread) mThread_AutoDelete;
 			function int32 (Object thread) mThread_GetMaxStackSize;
+			function void () mThread_Exiting;
 			function void () mGC_MarkAllStaticMembers;
 			function bool () mGC_CallRootCallbacks;
 			function void () mGC_Shutdown;

BeefLibs/corlib/src/Threading/Thread.bf

@@ -20,6 +20,11 @@ namespace System.Threading
         private Object mThreadStartArg;
 
         bool mAutoDelete;
+
+		static Monitor sMonitor = new .() ~ delete _;
+		static Event<delegate void()> sOnExit ~ _.Dispose();
+		Event<delegate void()> mOnExit ~ _.Dispose();
+
 		public static Thread sMainThread = new Thread() ~ delete _;
 
         [StaticInitPriority(102)]
@@ -62,6 +67,14 @@ namespace System.Threading
                 return ((Thread)thread).mMaxStackSize;
             }
 
+			static void Thread_Exiting()
+			{
+				using (sMonitor.Enter())
+				{
+					sOnExit();
+				}
+			}
+
             static void Thread_StartProc(Object threadObj)
             {
                 Thread thread = (Thread)threadObj;
@@ -103,6 +116,7 @@ namespace System.Threading
                 cb.[Friend]mThread_IsAutoDelete = => Thread_IsAutoDelete;
                 cb.[Friend]mThread_AutoDelete = => Thread_AutoDelete;
                 cb.[Friend]mThread_GetMaxStackSize = => Thread_GetMaxStackSize;
+				cb.[Friend]mThread_Exiting = => Thread_Exiting;
             }
         }
 
@@ -178,6 +192,38 @@ namespace System.Threading
             }
         }
 
+		public void AddExitNotify(delegate void() dlg)
+		{
+			using (sMonitor.Enter())
+			{
+				mOnExit.Add(dlg);
+			}
+		}
+
+		public Result<void> RemovedExitNotify(delegate void() dlg, bool delegateDelegate = false)
+		{
+			using (sMonitor.Enter())
+			{
+				return mOnExit.Remove(dlg, delegateDelegate);
+			}
+		}
+
+		public static void AddGlobalExitNotify(delegate void() dlg)
+		{
+			using (sMonitor.Enter())
+			{
+				sOnExit.Add(dlg);
+			}
+		}
+
+		public static Result<void> RemoveGlobalExitNotify(delegate void() dlg, bool delegateDelegate = false)
+		{
+			using (sMonitor.Enter())
+			{
+				return sOnExit.Remove(dlg, delegateDelegate);
+			}
+		}
+
         extern void ManualThreadInit();
         extern void StartInternal();
         extern void SetStackStart(void* ptr);
@@ -217,6 +263,7 @@ namespace System.Threading
 			}
 		}
 
+		public static extern void RequestExitNotify();
         public extern void Suspend();
         public extern void Resume();
 
@@ -316,9 +363,10 @@ namespace System.Threading
             }
         }
 
-        extern int32 GetThreadId();
+        [CallingConvention(.Cdecl)]
+        extern int GetThreadId();
 
-        public int32 Id
+        public int Id
         {
             get
             {
@@ -326,6 +374,8 @@ namespace System.Threading
             }
         }
 
+		public static int CurrentThreadId => Platform.BfpThread_GetCurrentId();
+
 		[CallingConvention(.Cdecl)]
         private static extern Thread GetCurrentThreadNative();
         
@@ -337,6 +387,12 @@ namespace System.Threading
 
         public ~this()
         {
+			using (sMonitor.Enter())
+			{
+				mOnExit();
+				sOnExit();
+			}
+
             // Make sure we're not deleting manually if mAutoDelete is set
             Debug.Assert((!mAutoDelete) || (CurrentThread == this));
             // Delegate to the unmanaged portion.

BeefRT/rt/BfObjects.h

@@ -3,7 +3,7 @@
 #include "BeefySysLib/Common.h"
 #include "BeefySysLib/util/String.h"
 
-#define BFRT_VERSION 9
+#define BFRT_VERSION 10
 
 #ifdef BFRT_DYNAMIC
 #define BFRT_EXPORT __declspec(dllexport)
@@ -99,6 +99,7 @@ namespace bf
 				bool(*Thread_IsAutoDelete)(bf::System::Threading::Thread* thread);
 				void(*Thread_AutoDelete)(bf::System::Threading::Thread* thread);
 				int32(*Thread_GetMaxStackSize)(bf::System::Threading::Thread* thread);				
+				void(*Thread_Exiting)();
 				void(*GC_MarkAllStaticMembers)();
 				bool(*GC_CallRootCallbacks)();
 				void(*GC_Shutdown)();

BeefRT/rt/Internal.cpp

@@ -55,6 +55,12 @@ static Beefy::StringT<0> gCmdLineString;
 bf::System::Runtime::BfRtCallbacks gBfRtCallbacks;
 BfRtFlags gBfRtFlags = (BfRtFlags)0;
 
+#ifdef BF_PLATFORM_WINDOWS
+DWORD gBfTLSKey = 0;
+#else
+pthread_key_t gBfTLSKey = 0;
+#endif
+
 static int gTestMethodIdx = -1;
 static uint32 gTestStartTick = 0;
 static bool gTestBreakOnFailure = false;
@@ -287,6 +293,11 @@ static void GetCrashInfo()
 	}
 }
 
+static void NTAPI TlsFreeFunc(void* ptr)
+{
+	gBfRtCallbacks.Thread_Exiting();
+}
+
 void bf::System::Runtime::Init(int version, int flags, BfRtCallbacks* callbacks)
 {
 	BfpSystemInitFlags sysInitFlags = BfpSystemInitFlag_InstallCrashCatcher;
@@ -343,6 +354,12 @@ void bf::System::Runtime::Init(int version, int flags, BfRtCallbacks* callbacks)
 			useCmdLineStr++;
 	}
 	gCmdLineString = useCmdLineStr;
+
+#ifdef BF_PLATFORM_WINDOWS
+	gBfTLSKey = FlsAlloc(TlsFreeFunc);	
+#else	
+	pthread_key_create(&gBfTLSKey, TlsFreeFunc);
+#endif
 }
 
 void bf::System::Runtime::SetErrorString(char* errorStr)

BeefRT/rt/Thread.cpp

@@ -19,6 +19,12 @@ BF_TLS_DECLSPEC Thread* Thread::sCurrentThread;
 static volatile int gLiveThreadCount;
 static Beefy::SyncEvent gThreadsDoneEvent;
 
+#ifdef BF_PLATFORM_WINDOWS
+extern DWORD gBfTLSKey;
+#else
+extern pthread_key_t gBfTLSKey;
+#endif
+
 bf::System::Threading::Thread* BfGetCurrentThread()
 {
 #ifdef BF_THREAD_TLS
@@ -134,6 +140,7 @@ static void BF_CALLTYPE CStartProc(void* threadParam)
 	//
 	{	
 		internalThread->ThreadStopped();		
+
 		Beefy::AutoCrit autoCrit(internalThread->mCritSect);
 		if (isAutoDelete)
 			gBfRtCallbacks.Thread_AutoDelete(thread);
@@ -207,15 +214,28 @@ void Thread::StartInternal()
 #endif
 }
 
+void Thread::RequestExitNotify()
+{
+	// Do we already have implicit exiting notification?
+	if (BfGetCurrentThread() != NULL)
+		return;
+
+#ifdef BF_PLATFORM_WINDOWS	
+	FlsSetValue(gBfTLSKey, (void*)&gBfRtCallbacks);
+#else		
+	pthread_setspecific(gBfTLSKey, (void*)&gBfRtCallbacks);
+#endif
+}
+
 void Thread::ThreadStarted()
 {
 	auto internalThread = GetInternalThread();
 	internalThread->mCritSect.Unlock();
 }
 
-int Thread::GetThreadId()
+intptr Thread::GetThreadId()
 {
-	return (int)GetInternalThread()->mThreadId;
+	return GetInternalThread()->mThreadId;
 }
 
 void Thread::SetStackStart(void* ptr)

BeefRT/rt/Thread.h

@@ -59,7 +59,7 @@ namespace bf
 				BFRT_EXPORT void SetBackgroundNative(bool isBackground);
 				BFRT_EXPORT int GetThreadStateNative();
 				BFRT_EXPORT void InformThreadNameChange(String* name);				
-				BFRT_EXPORT int GetThreadId();
+				BFRT_EXPORT intptr GetThreadId();
 
 				BFRT_EXPORT void Dbg_CreateInternal();
 
@@ -68,6 +68,7 @@ namespace bf
 				BFRT_EXPORT void Resume();
 				BFRT_EXPORT void Abort();
 
+				BFRT_EXPORT static void RequestExitNotify();
 				BFRT_EXPORT static void MemoryBarrier();
 
 				static Thread* Alloc()

BeefRT/rt/ThreadLocalStorage.cpp

@@ -35,7 +35,7 @@ uint32 BfTLSManager::Alloc()
 		}
 	}
 
-    mAllocatedKeys[idx] = BfpTLS_Create();
+    mAllocatedKeys[idx] = BfpTLS_Create(NULL);
 	mAssociatedTLSDatums[idx] = NULL;
 	return idx;
 }

BeefRT/rt/ThreadLocalStorage.h

@@ -43,7 +43,7 @@ public:
 
 	BfTLSManager()
 	{
-        sInternalThreadKey = BfpTLS_Create();
+        sInternalThreadKey = BfpTLS_Create(NULL);
 		mAssociatedTLSDatums = NULL;
 		mAllocSize = 0;
 		mAllocIdx = 1;

BeefySysLib/platform/PlatformInterface.h

@@ -223,6 +223,7 @@ enum BfpThreadCreateFlags
 };
 
 typedef void (BFP_CALLTYPE *BfpThreadStartProc)(void* threadParam);
+typedef void (BFP_CALLTYPE* BfpTLSProc)(void* threadParam);
 
 enum BfpThreadPriority
 {
@@ -273,8 +274,9 @@ BFP_EXPORT void BFP_CALLTYPE BfpCritSect_Enter(BfpCritSect* critSect);
 BFP_EXPORT bool BFP_CALLTYPE BfpCritSect_TryEnter(BfpCritSect* critSect, int waitMS);
 BFP_EXPORT void BFP_CALLTYPE BfpCritSect_Leave(BfpCritSect* critSect);
 
+
 struct BfpTLS;
-BFP_EXPORT BfpTLS* BFP_CALLTYPE BfpTLS_Create();
+BFP_EXPORT BfpTLS* BFP_CALLTYPE BfpTLS_Create(BfpTLSProc exitProc);
 BFP_EXPORT void BFP_CALLTYPE BfpTLS_Release(BfpTLS* tls);
 BFP_EXPORT void BFP_CALLTYPE BfpTLS_SetValue(BfpTLS* tls, void* value);
 BFP_EXPORT void* BFP_CALLTYPE BfpTLS_GetValue(BfpTLS* tls);

BeefySysLib/platform/posix/PosixCommon.cpp

@@ -1528,10 +1528,10 @@ BFP_EXPORT void BFP_CALLTYPE BfpCritSect_Leave(BfpCritSect* critSect)
     pthread_mutex_unlock(&critSect->mPMutex);
 }
 
-BFP_EXPORT BfpTLS* BFP_CALLTYPE BfpTLS_Create()
+BFP_EXPORT BfpTLS* BFP_CALLTYPE BfpTLS_Create(BfpTLSProc exitProc)
 {
     pthread_key_t key = 0;
-    pthread_key_create(&key, NULL);
+    pthread_key_create(&key, exitProc);
     return (BfpTLS*)(intptr)key;
 }
 

BeefySysLib/platform/win/Platform.cpp

@@ -2530,24 +2530,24 @@ BFP_EXPORT void BFP_CALLTYPE BfpCritSect_Leave(BfpCritSect* critSect)
 #define BFPTLS_TO_DWORD(val) ((DWORD)(intptr)(val))
 
 struct BfpTLS;
-BFP_EXPORT BfpTLS* BFP_CALLTYPE BfpTLS_Create()
+BFP_EXPORT BfpTLS* BFP_CALLTYPE BfpTLS_Create(BfpTLSProc exitProc)
 {
-	return DWORD_TO_BFPTLS(::TlsAlloc());
+	return DWORD_TO_BFPTLS(::FlsAlloc(exitProc));
 }
 
 BFP_EXPORT void BFP_CALLTYPE BfpTLS_Release(BfpTLS* tls)
 {
-	::TlsFree(BFPTLS_TO_DWORD(tls));
+	::FlsFree(BFPTLS_TO_DWORD(tls));
 }
 
 BFP_EXPORT void BFP_CALLTYPE BfpTLS_SetValue(BfpTLS* tls, void* value)
 {
-	::TlsSetValue(BFPTLS_TO_DWORD(tls), value);
+	::FlsSetValue(BFPTLS_TO_DWORD(tls), value);
 }
 
 BFP_EXPORT void* BFP_CALLTYPE BfpTLS_GetValue(BfpTLS* tls)
 {
-	return ::TlsGetValue(BFPTLS_TO_DWORD(tls));
+	return ::FlsGetValue(BFPTLS_TO_DWORD(tls));
 }
 
 BFP_EXPORT BfpEvent* BFP_CALLTYPE BfpEvent_Create(BfpEventFlags flags)

IDE/mintest/minlib/src/System/Diagnostics/Profiler.bf

@@ -38,7 +38,7 @@ namespace System.Diagnostics
 			}
 		}
 
-		static Result<ProfileId> StartSampling(int32 threadId, StringView profileDesc)
+		static Result<ProfileId> StartSampling(int threadId, StringView profileDesc)
 		{
 			//int32 curId = Interlocked.Increment(ref gProfileId);
 			int32 curId = gProfileId++;

IDE/mintest/minlib/src/System/Result.bf

@@ -95,7 +95,7 @@ namespace System
 
 	extension Result<T> where T : IDisposable
 	{
-		public void Dispose()
+		public new void Dispose()
 		{
 			if (this case .Ok(var val))
 				val.Dispose();
@@ -199,7 +199,7 @@ namespace System
 
 	extension Result<T, TErr> where T : IDisposable
 	{
-		public void Dispose()
+		public new void Dispose()
 		{
 			if (this case .Ok(var val))
 				val.Dispose();
@@ -208,7 +208,7 @@ namespace System
 
 	extension Result<T, TErr> where TErr : IDisposable
 	{
-		public void Dispose()
+		public new void Dispose()
 		{
 			if (this case .Err(var err))
 				err.Dispose();
@@ -217,7 +217,7 @@ namespace System
 
 	extension Result<T, TErr> where T : IDisposable where TErr : IDisposable
 	{
-		public void Dispose()
+		public new void Dispose()
 		{
 			if (this case .Ok(var val))
 				val.Dispose();

IDE/mintest/minlib/src/System/Runtime.bf

@@ -7,7 +7,7 @@ namespace System
 	[StaticInitPriority(100)]
 	class Runtime
 	{
-		const int32 cVersion = 9;
+		const int32 cVersion = 10;
 
 		[CRepr, AlwaysInclude]
 		struct BfDebugMessageData
@@ -116,6 +116,7 @@ namespace System
 			function bool (Object thread) mThread_IsAutoDelete;
 			function void (Object thread) mThread_AutoDelete;
 			function int32 (Object thread) mThread_GetMaxStackSize;
+			function void () mThread_Exiting;
 			function void () mGC_MarkAllStaticMembers;
 			function bool () mGC_CallRootCallbacks;
 			function void () mGC_Shutdown;

IDE/mintest/minlib/src/System/Threading/Thread.bf

@@ -78,6 +78,11 @@ namespace System.Threading
                 }
             }
 
+			static void Thread_Exiting()
+			{
+				
+			}
+
             public static this()
             {
                 var cb = ref Runtime.BfRtCallbacks.[Friend]sCallbacks;
@@ -90,6 +95,7 @@ namespace System.Threading
                 cb.[Friend]mThread_IsAutoDelete = => Thread_IsAutoDelete;
                 cb.[Friend]mThread_AutoDelete = => Thread_AutoDelete;
                 cb.[Friend]mThread_GetMaxStackSize = => Thread_GetMaxStackSize;
+                cb.[Friend]mThread_Exiting = => Thread_Exiting;
             }
         }
 
@@ -280,9 +286,10 @@ namespace System.Threading
             }
         }
 
-        extern int32 GetThreadId();
+        [CallingConvention(.Cdecl)]
+        extern int GetThreadId();
 
-        public int32 Id
+        public int Id
         {
             get
             {