// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.


/*============================================================
**
** Header: COMSynchronizable.cpp
**
** Purpose: Native methods on System.SynchronizableObject
**          and its subclasses.
**
**
===========================================================*/

#include "common.h"

#include <object.h>
#include "threads.h"
#include "excep.h"
#include "vars.hpp"
#include "field.h"
#include "security.h"
#include "comsynchronizable.h"
#include "dbginterface.h"
#include "comdelegate.h"
#ifdef FEATURE_REMOTING
#include "remoting.h"
#endif
#include "eeconfig.h"
#include "stackcompressor.h"
#ifdef FEATURE_REMOTING
#include "appdomainhelper.h"
#include "objectclone.h"
#else
#include "callhelpers.h"
#endif
#include "appdomain.hpp"
#include "appdomain.inl"
#ifdef FEATURE_REMOTING
#include "crossdomaincalls.h"
#endif

#include "newapis.h"

// To include definition of CAPTURE_BUCKETS_AT_TRANSITION
#include "exstate.h"

// The two threads need to communicate some information.  Any object references must
// be declared to GC.
struct SharedState
{
    OBJECTHANDLE    m_Threadable;
    OBJECTHANDLE    m_ThreadStartArg;
    Thread         *m_Internal;
    OBJECTHANDLE    m_Principal;

    SharedState(OBJECTREF threadable, OBJECTREF threadStartArg, Thread *internal, OBJECTREF principal)
    {
        CONTRACTL
        {
            GC_NOTRIGGER;
            THROWS;  // From CreateHandle()
            MODE_COOPERATIVE;
        }
        CONTRACTL_END;
        AppDomainFromIDHolder ad(internal->GetKickOffDomainId(), TRUE);
        if (ad.IsUnloaded())
            COMPlusThrow(kAppDomainUnloadedException);

        m_Threadable = ad->CreateHandle(threadable);
        m_ThreadStartArg = ad->CreateHandle(threadStartArg);

        m_Internal = internal;

        m_Principal = ad->CreateHandle(principal);
    }

    ~SharedState()
    {
        CONTRACTL
        {
            GC_NOTRIGGER;
            NOTHROW;
            MODE_COOPERATIVE;
        }
        CONTRACTL_END;

        // It's important to have no GC rendez-vous point between the checking and the clean-up below.
        // The three handles below could be in an appdomain which is just starting to be unloaded, or an appdomain
        // which has been unloaded already.  Thus, we need to check whether the appdomain is still valid before
        // we do the clean-up.  Since we suspend all runtime threads when we try to do the unload, there will be no
        // race condition between the checking and the clean-up as long as this thread cannot be suspended in between.
        AppDomainFromIDHolder ad(m_Internal->GetKickOffDomainId(), TRUE);
        if (!ad.IsUnloaded())
        {
            DestroyHandle(m_Threadable);
            DestroyHandle(m_ThreadStartArg);
            DestroyHandle(m_Principal);
        }
    }
};


// For the following helpers, we make no attempt to synchronize.  The app developer
// is responsible for managing his own race conditions.
//
// Note: if the internal Thread is NULL, this implies that the exposed object has
//       finalized and then been resurrected.
static inline BOOL ThreadNotStarted(Thread *t)
{
    WRAPPER_NO_CONTRACT;
    return (t && t->IsUnstarted() && !t->HasValidThreadHandle());
}

static inline BOOL ThreadIsRunning(Thread *t)
{
    WRAPPER_NO_CONTRACT;
#ifdef FEATURE_INCLUDE_ALL_INTERFACES
    return (t &&
            (t->m_State & (Thread::TS_ReportDead|Thread::TS_Dead)) == 0 &&
            (CLRTaskHosted()? t->GetHostTask()!=NULL:t->HasValidThreadHandle()));
#else // !FEATURE_INCLUDE_ALL_INTERFACES
    return (t &&
            (t->m_State & (Thread::TS_ReportDead|Thread::TS_Dead)) == 0 &&
            (t->HasValidThreadHandle()));
#endif // FEATURE_INCLUDE_ALL_INTERFACES
}

static inline BOOL ThreadIsDead(Thread *t)
{
    WRAPPER_NO_CONTRACT;
    return (t == 0 || t->IsDead());
}


// Map our exposed notion of thread priorities into the enumeration that NT uses.
static INT32 MapToNTPriority(INT32 ours)
{
    CONTRACTL
    {
        GC_NOTRIGGER;
        THROWS;
        MODE_ANY;
    }
    CONTRACTL_END;

    INT32   NTPriority = 0;

    switch (ours)
    {
    case ThreadNative::PRIORITY_LOWEST:
        NTPriority = THREAD_PRIORITY_LOWEST;
        break;

    case ThreadNative::PRIORITY_BELOW_NORMAL:
        NTPriority = THREAD_PRIORITY_BELOW_NORMAL;
        break;

    case ThreadNative::PRIORITY_NORMAL:
        NTPriority = THREAD_PRIORITY_NORMAL;
        break;

    case ThreadNative::PRIORITY_ABOVE_NORMAL:
        NTPriority = THREAD_PRIORITY_ABOVE_NORMAL;
        break;

    case ThreadNative::PRIORITY_HIGHEST:
        NTPriority = THREAD_PRIORITY_HIGHEST;
        break;

    default:
        COMPlusThrow(kArgumentOutOfRangeException, W("Argument_InvalidFlag"));
    }
    return NTPriority;
}


// Map to our exposed notion of thread priorities from the enumeration that NT uses.
INT32 MapFromNTPriority(INT32 NTPriority)
{
    LIMITED_METHOD_CONTRACT;

    INT32   ours = 0;

    if (NTPriority <= THREAD_PRIORITY_LOWEST)
    {
        // managed code does not support IDLE.  Map it to PRIORITY_LOWEST.
        ours = ThreadNative::PRIORITY_LOWEST;
    }
    else if (NTPriority >= THREAD_PRIORITY_HIGHEST)
    {
        ours = ThreadNative::PRIORITY_HIGHEST;
    }
    else if (NTPriority == THREAD_PRIORITY_BELOW_NORMAL)
    {
        ours = ThreadNative::PRIORITY_BELOW_NORMAL;
    }
    else if (NTPriority == THREAD_PRIORITY_NORMAL)
    {
        ours = ThreadNative::PRIORITY_NORMAL;
    }
    else if (NTPriority == THREAD_PRIORITY_ABOVE_NORMAL)
    {
        ours = ThreadNative::PRIORITY_ABOVE_NORMAL;
    }
    else
    {
        _ASSERTE (!"not supported priority");
        ours = ThreadNative::PRIORITY_NORMAL;
    }
    return ours;
}


void ThreadNative::KickOffThread_Worker(LPVOID ptr)
{
    CONTRACTL
    {
        GC_TRIGGERS;
        THROWS;
        MODE_COOPERATIVE;
        SO_TOLERANT;
    }
    CONTRACTL_END;

    KickOffThread_Args *args = (KickOffThread_Args *) ptr;
    _ASSERTE(ObjectFromHandle(args->share->m_Threadable) != NULL);
    args->retVal = 0;

    // we are saving the delagate and result primarily for debugging
    struct _gc
    {
        OBJECTREF orPrincipal;
        OBJECTREF orThreadStartArg;
        OBJECTREF orDelegate;
        OBJECTREF orResult;
        OBJECTREF orThread;
    } gc;
    ZeroMemory(&gc, sizeof(gc));

    Thread *pThread;
    pThread = GetThread();
    _ASSERTE(pThread);
    GCPROTECT_BEGIN(gc);
    BEGIN_SO_INTOLERANT_CODE(pThread);

    gc.orPrincipal = ObjectFromHandle(args->share->m_Principal);

#ifdef FEATURE_IMPERSONATION
    // Push the initial security principal object (if any) onto the
    // managed thread.
    if (gc.orPrincipal != NULL)
    {
        gc.orThread = args->pThread->GetExposedObject();
        MethodDescCallSite setPrincipalInternal(METHOD__THREAD__SET_PRINCIPAL_INTERNAL, &gc.orThread);
        ARG_SLOT argsToSetPrincipal[2];
        argsToSetPrincipal[0] = ObjToArgSlot(gc.orThread);
        argsToSetPrincipal[1] = ObjToArgSlot(gc.orPrincipal);
        setPrincipalInternal.Call(argsToSetPrincipal);
    }
#endif

    gc.orDelegate = ObjectFromHandle(args->share->m_Threadable);
    gc.orThreadStartArg = ObjectFromHandle(args->share->m_ThreadStartArg);

    // We cannot call the Delegate Invoke method directly from ECall.  The
    //  stub has not been created for non multicast delegates.  Instead, we
    //  will invoke the Method on the OR stored in the delegate directly.
    // If there are changes to the signature of the ThreadStart delegate
    //  this code will need to change.  I've noted this in the Thread start
    //  class.

    delete args->share;
    args->share = 0;

    MethodDesc *pMeth = ((DelegateEEClass*)( gc.orDelegate->GetMethodTable()->GetClass() ))->m_pInvokeMethod;
    _ASSERTE(pMeth);
    MethodDescCallSite invokeMethod(pMeth, &gc.orDelegate);

    if (MscorlibBinder::IsClass(gc.orDelegate->GetMethodTable(), CLASS__PARAMETERIZEDTHREADSTART))
    {
        //Parameterized ThreadStart
        ARG_SLOT arg[2];

        arg[0] = ObjToArgSlot(gc.orDelegate);
        arg[1]=ObjToArgSlot(gc.orThreadStartArg);
        invokeMethod.Call(arg);
    }
    else
    {
        //Simple ThreadStart
        ARG_SLOT arg[1];

        arg[0] = ObjToArgSlot(gc.orDelegate);
        invokeMethod.Call(arg);
    }
	STRESS_LOG2(LF_SYNC, LL_INFO10, "Managed thread exiting normally for delegate %p Type %pT\n", OBJECTREFToObject(gc.orDelegate), (size_t) gc.orDelegate->GetMethodTable());

    END_SO_INTOLERANT_CODE;
    GCPROTECT_END();
}

// Helper to avoid two EX_TRY/EX_CATCH blocks in one function
static void PulseAllHelper(Thread* pThread)
{
    CONTRACTL
    {
        GC_TRIGGERS;
        DISABLED(NOTHROW);
        MODE_COOPERATIVE;
    }
    CONTRACTL_END;

    EX_TRY
    {
        // GetExposedObject() will either throw, or we have a valid object.  Note
        // that we re-acquire it each time, since it may move during calls.
        pThread->GetExposedObject()->EnterObjMonitor();
        pThread->GetExposedObject()->PulseAll();
        pThread->GetExposedObject()->LeaveObjMonitor();
    }
    EX_CATCH
    {
        // just keep going...
    }
    EX_END_CATCH(SwallowAllExceptions)
}

// When an exposed thread is started by Win32, this is where it starts.
ULONG __stdcall ThreadNative::KickOffThread(void* pass)
{

    CONTRACTL
    {
        GC_TRIGGERS;
        THROWS;
        MODE_ANY;
        SO_TOLERANT;
    }
    CONTRACTL_END;

    ULONG retVal = 0;
    // Before we do anything else, get Setup so that we have a real thread.

    // Our thread isn't setup yet, so we can't use the standard probe
    BEGIN_SO_INTOLERANT_CODE_NO_THROW_CHECK_THREAD(return E_FAIL);

    KickOffThread_Args args;
    // don't have a separate var becuase this can be updated in the worker
    args.share   = (SharedState *) pass;
    args.pThread = args.share->m_Internal;

    Thread* pThread = args.pThread;

    _ASSERTE(pThread != NULL);

    BOOL ok = TRUE;

    {
        EX_TRY
        {
            CExecutionEngine::CheckThreadState(0);
        }
        EX_CATCH
        {
            // OOM might be thrown from CheckThreadState, so it's important
            // that we don't rethrow it; if we do then the process will die
            // because there are no installed handlers at this point, so
            // swallow the exception.  this will set the thread's state to
            // FailStarted which will result in a ThreadStartException being
            // thrown from the thread that attempted to start this one.
            if (!GET_EXCEPTION()->IsTransient() && !SwallowUnhandledExceptions())
                EX_RETHROW;
        }
        EX_END_CATCH(SwallowAllExceptions);
        if (CExecutionEngine::CheckThreadStateNoCreate(0) == NULL)
        {
            // We can not 
            pThread->SetThreadState(Thread::TS_FailStarted);
            pThread->DetachThread(FALSE);
            // !!! Do not touch any field of Thread object.  The Thread object is subject to delete
            // !!! after DetachThread call.
            ok = FALSE;
        }
    }

    if (ok)
    {
        ok = pThread->HasStarted();
    }

    if (ok)
    {
        // Do not swallow the unhandled exception here
        //

        // Fire ETW event to correlate with the thread that created current thread
        if (ETW_EVENT_ENABLED(MICROSOFT_WINDOWS_DOTNETRUNTIME_PROVIDER_Context, ThreadRunning))
            FireEtwThreadRunning(pThread, GetClrInstanceId());

        // We have a sticky problem here.
        //
        // Under some circumstances, the context of 'this' doesn't match the context
        // of the thread.  Today this can only happen if the thread is marked for an
        // STA.  If so, the delegate that is stored in the object may not be directly
        // suitable for invocation.  Instead, we need to call through a proxy so that
        // the correct context transitions occur.
        //
        // All the changes occur inside HasStarted(), which will switch this thread
        // over to a brand new STA as necessary.  We have to notice this happening, so
        // we can adjust the delegate we are going to invoke on.

        _ASSERTE(GetThread() == pThread);        // Now that it's started
        ManagedThreadBase::KickOff(pThread->GetKickOffDomainId(), KickOffThread_Worker, &args);

        // If TS_FailStarted is set then the args are deleted in ThreadNative::StartInner
        if ((args.share) && !pThread->HasThreadState(Thread::TS_FailStarted))
        {
            delete args.share;
        }

        PulseAllHelper(pThread);

        GCX_PREEMP_NO_DTOR();

        pThread->ClearThreadCPUGroupAffinity();

        DestroyThread(pThread);
    }

    END_SO_INTOLERANT_CODE;

    return retVal;
}


FCIMPL3(void, ThreadNative::Start, ThreadBaseObject* pThisUNSAFE, Object* pPrincipalUNSAFE, StackCrawlMark* pStackMark)
{
    FCALL_CONTRACT;

    HELPER_METHOD_FRAME_BEGIN_NOPOLL();

    StartInner(pThisUNSAFE, pPrincipalUNSAFE, pStackMark);

    HELPER_METHOD_FRAME_END_POLL();
}
FCIMPLEND

// Start up a thread, which by now should be in the ThreadStore's Unstarted list.
void ThreadNative::StartInner(ThreadBaseObject* pThisUNSAFE, Object* pPrincipalUNSAFE, StackCrawlMark* pStackMark)
{
    CONTRACTL
    {
        GC_TRIGGERS;
        THROWS;
        MODE_COOPERATIVE;
    }
    CONTRACTL_END;

    struct _gc
    {
        OBJECTREF       pPrincipal;
        THREADBASEREF   pThis;
    } gc;

    gc.pPrincipal  = (OBJECTREF) pPrincipalUNSAFE;
    gc.pThis       = (THREADBASEREF) pThisUNSAFE;

    GCPROTECT_BEGIN(gc);

    if (gc.pThis == NULL)
        COMPlusThrow(kNullReferenceException, W("NullReference_This"));

    Thread        *pNewThread = gc.pThis->GetInternal();
    if (pNewThread == NULL)
        COMPlusThrow(kThreadStateException, IDS_EE_THREAD_CANNOT_GET);

    _ASSERTE(GetThread() != NULL);          // Current thread wandered in!

    gc.pThis->EnterObjMonitor();

    EX_TRY
    {
        // Is the thread already started?  You can't restart a thread.
        if (!ThreadNotStarted(pNewThread))
        {
            COMPlusThrow(kThreadStateException, IDS_EE_THREADSTART_STATE);
        }

        OBJECTREF   threadable = gc.pThis->GetDelegate();
        OBJECTREF   threadStartArg = gc.pThis->GetThreadStartArg();
        gc.pThis->SetDelegate(NULL);
        gc.pThis->SetThreadStartArg(NULL);

        // This can never happen, because we construct it with a valid one and then
        // we never let you change it (because SetStart is private).
        _ASSERTE(threadable != NULL);

        // Allocate this away from our stack, so we can unwind without affecting
        // KickOffThread.  It is inside a GCFrame, so we can enable GC now.
        NewHolder<SharedState> share(new SharedState(threadable, threadStartArg, pNewThread, gc.pPrincipal));

        pNewThread->IncExternalCount();

        // Fire an ETW event to mark the current thread as the launcher of the new thread
        if (ETW_EVENT_ENABLED(MICROSOFT_WINDOWS_DOTNETRUNTIME_PROVIDER_Context, ThreadCreating))
            FireEtwThreadCreating(pNewThread, GetClrInstanceId());

        // As soon as we create the new thread, it is eligible for suspension, etc.
        // So it gets transitioned to cooperative mode before this call returns to
        // us.  It is our duty to start it running immediately, so that GC isn't blocked.

        BOOL success = pNewThread->CreateNewThread(
                                        pNewThread->RequestedThreadStackSize() /* 0 stackSize override*/,
                                        KickOffThread, share);

        if (!success)
        {
            pNewThread->DecExternalCount(FALSE);
            COMPlusThrowOM();
        }

        // After we have established the thread handle, we can check m_Priority.
        // This ordering is required to eliminate the race condition on setting the
        // priority of a thread just as it starts up.
        pNewThread->SetThreadPriority(MapToNTPriority(gc.pThis->m_Priority));
        pNewThread->ChooseThreadCPUGroupAffinity();

        FastInterlockOr((ULONG *) &pNewThread->m_State, Thread::TS_LegalToJoin);

        DWORD   ret;
        ret = pNewThread->StartThread();

        // When running under a user mode native debugger there is a race
        // between the moment we've created the thread (in CreateNewThread) and 
        // the moment we resume it (in StartThread); the debugger may receive 
        // the "ct" (create thread) notification, and it will attempt to 
        // suspend/resume all threads in the process.  Now imagine the debugger
        // resumes this thread first, and only later does it try to resume the
        // newly created thread.  In these conditions our call to ResumeThread  
        // may come before the debugger's call to ResumeThread actually causing 
        // ret to equal 2.
        // We cannot use IsDebuggerPresent() in the condition below because the 
        // debugger may have been detached between the time it got the notification
        // and the moment we execute the test below.
        _ASSERTE(ret == 1 || ret == 2);

        {
            GCX_PREEMP();

            // Synchronize with HasStarted.
            YIELD_WHILE (!pNewThread->HasThreadState(Thread::TS_FailStarted) &&
                   pNewThread->HasThreadState(Thread::TS_Unstarted));
        }

        if (!pNewThread->HasThreadState(Thread::TS_FailStarted))
        {
            share.SuppressRelease();       // we have handed off ownership of the shared struct
        }
        else
        {
            share.Release();
            PulseAllHelper(pNewThread);
            pNewThread->HandleThreadStartupFailure();
        }
    }
    EX_CATCH
    {
        gc.pThis->LeaveObjMonitor();
        EX_RETHROW;
    }
    EX_END_CATCH_UNREACHABLE;
    
    gc.pThis->LeaveObjMonitor();

    GCPROTECT_END();
}

FCIMPL1(void, ThreadNative::Abort, ThreadBaseObject* pThis)
{
    FCALL_CONTRACT;

    if (pThis == NULL)
        FCThrowVoid(kNullReferenceException);

    THREADBASEREF thisRef(pThis);
    // We need to keep the managed Thread object alive so that we can call UserAbort on
    // unmanaged thread object.
    HELPER_METHOD_FRAME_BEGIN_1(thisRef);

    Thread *thread = thisRef->GetInternal();
    if (thread == NULL)
        COMPlusThrow(kThreadStateException, IDS_EE_THREAD_CANNOT_GET);
#ifdef _DEBUG
    DWORD testAbort = g_pConfig->GetHostTestThreadAbort();
    if (testAbort != 0) {
        thread->UserAbort(Thread::TAR_Thread, testAbort == 1 ? EEPolicy::TA_Safe : EEPolicy::TA_Rude, INFINITE, Thread::UAC_Normal);
    }
    else
#endif
        thread->UserAbort(Thread::TAR_Thread, EEPolicy::TA_V1Compatible, INFINITE, Thread::UAC_Normal);

    if (thread->CatchAtSafePoint())
        CommonTripThread();
    HELPER_METHOD_FRAME_END_POLL();
}
FCIMPLEND

FCIMPL1(void, ThreadNative::ResetAbort, ThreadBaseObject* pThis)
{
    FCALL_CONTRACT;

    _ASSERTE(pThis);
    VALIDATEOBJECT(pThis);

    Thread *thread = pThis->GetInternal();
    // We do not allow user to reset rude thread abort in MustRun code.
    if (thread && thread->IsRudeAbort())
    {
        return;
    }

    HELPER_METHOD_FRAME_BEGIN_NOPOLL();

    if (thread == NULL)
        COMPlusThrow(kThreadStateException, IDS_EE_THREAD_CANNOT_GET);
    thread->UserResetAbort(Thread::TAR_Thread);
    thread->ClearAborted();
    HELPER_METHOD_FRAME_END_POLL();
}
FCIMPLEND

#ifndef FEATURE_CORECLR
// You can only suspend a running thread.
FCIMPL1(void, ThreadNative::Suspend, ThreadBaseObject* pThisUNSAFE)
{
    FCALL_CONTRACT;

    if (pThisUNSAFE == NULL)
        FCThrowResVoid(kNullReferenceException, W("NullReference_This"));

    Thread  *thread = pThisUNSAFE->GetInternal();

    HELPER_METHOD_FRAME_BEGIN_0();

#ifdef MDA_SUPPORTED
    MDA_TRIGGER_ASSISTANT(DangerousThreadingAPI, ReportViolation(W("System.Threading.Thread.Suspend")));
#endif
    
    if (!ThreadIsRunning(thread))
        COMPlusThrow(kThreadStateException, IDS_EE_THREAD_SUSPEND_NON_RUNNING);

    thread->UserSuspendThread();

    HELPER_METHOD_FRAME_END();
}
FCIMPLEND

// You can only resume a thread that is in the user-suspended state.  (This puts a large
// burden on the app developer, but we want him to be thinking carefully about race
// conditions.  Precise errors give him a hope of sorting out his logic).
FCIMPL1(void, ThreadNative::Resume, ThreadBaseObject* pThisUNSAFE)
{
    FCALL_CONTRACT;

    if (pThisUNSAFE == NULL)
        FCThrowResVoid(kNullReferenceException, W("NullReference_This"));

    Thread  *thread = pThisUNSAFE->GetInternal();

    HELPER_METHOD_FRAME_BEGIN_0();

    // UserResumeThread() will return 0 if there isn't a user suspension for us to
    // clear.
    if (!ThreadIsRunning(thread))
        COMPlusThrow(kThreadStateException, IDS_EE_THREAD_RESUME_NON_RUNNING);

    if (thread->UserResumeThread() == 0)
        COMPlusThrow(kThreadStateException, IDS_EE_THREAD_RESUME_NON_USER_SUSPEND);

    HELPER_METHOD_FRAME_END();
}
FCIMPLEND

#endif // FEATURE_CORECLR

// Note that you can manipulate the priority of a thread that hasn't started yet,
// or one that is running.  But you get an exception if you manipulate the priority
// of a thread that has died.
FCIMPL1(INT32, ThreadNative::GetPriority, ThreadBaseObject* pThisUNSAFE)
{
    FCALL_CONTRACT;

    if (pThisUNSAFE==NULL)
        FCThrowRes(kNullReferenceException, W("NullReference_This"));

    // validate the handle
    if (ThreadIsDead(pThisUNSAFE->GetInternal()))
        FCThrowEx(kThreadStateException, IDS_EE_THREAD_DEAD_PRIORITY, NULL, NULL, NULL);

    return pThisUNSAFE->m_Priority;
}
FCIMPLEND

FCIMPL2(void, ThreadNative::SetPriority, ThreadBaseObject* pThisUNSAFE, INT32 iPriority)
{
    FCALL_CONTRACT;

    int     priority;
    Thread *thread;

    THREADBASEREF  pThis = (THREADBASEREF) pThisUNSAFE;
    HELPER_METHOD_FRAME_BEGIN_1(pThis);

    if (pThis==NULL)
    {
        COMPlusThrow(kNullReferenceException, W("NullReference_This"));
    }

    // translate the priority (validating as well)
    priority = MapToNTPriority(iPriority);  // can throw; needs a frame

    // validate the thread
    thread = pThis->GetInternal();

    if (ThreadIsDead(thread))
    {
        COMPlusThrow(kThreadStateException, IDS_EE_THREAD_DEAD_PRIORITY, NULL, NULL, NULL);
    }

    INT32 oldPriority = pThis->m_Priority;

    // Eliminate the race condition by establishing m_Priority before we check for if
    // the thread is running.  See ThreadNative::Start() for the other half.
    pThis->m_Priority = iPriority;

    if (!thread->SetThreadPriority(priority))
    {
        pThis->m_Priority = oldPriority;
        COMPlusThrow(kThreadStateException, IDS_EE_THREAD_PRIORITY_FAIL, NULL, NULL, NULL);
    }

    HELPER_METHOD_FRAME_END();
}
FCIMPLEND

// This service can be called on unstarted and dead threads.  For unstarted ones, the
// next wait will be interrupted.  For dead ones, this service quietly does nothing.
FCIMPL1(void, ThreadNative::Interrupt, ThreadBaseObject* pThisUNSAFE)
{
    FCALL_CONTRACT;

    if (pThisUNSAFE==NULL)
        FCThrowResVoid(kNullReferenceException, W("NullReference_This"));

    Thread  *thread = pThisUNSAFE->GetInternal();

    if (thread == 0)
        FCThrowExVoid(kThreadStateException, IDS_EE_THREAD_CANNOT_GET, NULL, NULL, NULL);

    HELPER_METHOD_FRAME_BEGIN_0();

    thread->UserInterrupt(Thread::TI_Interrupt);

    HELPER_METHOD_FRAME_END();
}
FCIMPLEND

FCIMPL1(FC_BOOL_RET, ThreadNative::IsAlive, ThreadBaseObject* pThisUNSAFE)
{
    FCALL_CONTRACT;

    if (pThisUNSAFE==NULL)
        FCThrowRes(kNullReferenceException, W("NullReference_This"));

    THREADBASEREF thisRef(pThisUNSAFE);
    BOOL ret = false;

    // Keep managed Thread object alive, since the native object's
    // lifetime is tied to the managed object's finalizer.  And with 
    // resurrection, it may be possible to get a dangling pointer here -
    // consider both protecting thisRef and setting the managed object's
    // Thread* to NULL in the GC's ScanForFinalization method.
    HELPER_METHOD_FRAME_BEGIN_RET_1(thisRef);

    Thread  *thread = thisRef->GetInternal();

    if (thread == 0)
        COMPlusThrow(kThreadStateException, IDS_EE_THREAD_CANNOT_GET);

    ret = ThreadIsRunning(thread);

    HELPER_METHOD_POLL();
    HELPER_METHOD_FRAME_END();

    FC_RETURN_BOOL(ret);
}
FCIMPLEND

FCIMPL2(FC_BOOL_RET, ThreadNative::Join, ThreadBaseObject* pThisUNSAFE, INT32 Timeout)
{
    FCALL_CONTRACT;

    BOOL            retVal = FALSE;
    THREADBASEREF   pThis   = (THREADBASEREF) pThisUNSAFE;

    HELPER_METHOD_FRAME_BEGIN_RET_1(pThis);

    if (pThis==NULL)
        COMPlusThrow(kNullReferenceException, W("NullReference_This"));

    // validate the timeout
    if ((Timeout < 0) && (Timeout != INFINITE_TIMEOUT))
        COMPlusThrowArgumentOutOfRange(W("millisecondsTimeout"), W("ArgumentOutOfRange_NeedNonNegOrNegative1"));

    retVal = DoJoin(pThis, Timeout);

    HELPER_METHOD_FRAME_END();

    FC_RETURN_BOOL(retVal);
}
FCIMPLEND

#undef Sleep
FCIMPL1(void, ThreadNative::Sleep, INT32 iTime)
{
    FCALL_CONTRACT;

    HELPER_METHOD_FRAME_BEGIN_0();

    // validate the sleep time
    if ((iTime < 0) && (iTime != INFINITE_TIMEOUT))
        COMPlusThrowArgumentOutOfRange(W("millisecondsTimeout"), W("ArgumentOutOfRange_NeedNonNegOrNegative1"));

    while(true)
    {
        INT64 sPauseTime = g_PauseTime;
        INT64 sTime = CLRGetTickCount64();
        GetThread()->UserSleep(iTime);       
        iTime = (INT32)AdditionalWait(sPauseTime, sTime, iTime);
        if(iTime == 0)
            break;
    }

    HELPER_METHOD_FRAME_END();
}
FCIMPLEND

#define Sleep(dwMilliseconds) Dont_Use_Sleep(dwMilliseconds)

FCIMPL1(INT32, ThreadNative::GetManagedThreadId, ThreadBaseObject* th) {
    FCALL_CONTRACT;

    FC_GC_POLL_NOT_NEEDED();
    if (th == NULL)
        FCThrow(kNullReferenceException);

    return th->GetManagedThreadId();
}
FCIMPLEND

NOINLINE static Object* GetCurrentThreadHelper()
{
    FCALL_CONTRACT;
    FC_INNER_PROLOG(ThreadNative::GetCurrentThread);
    OBJECTREF   refRetVal  = NULL;

    HELPER_METHOD_FRAME_BEGIN_RET_ATTRIB_1(Frame::FRAME_ATTR_EXACT_DEPTH|Frame::FRAME_ATTR_CAPTURE_DEPTH_2, refRetVal);
    refRetVal = GetThread()->GetExposedObject();
    HELPER_METHOD_FRAME_END();

    FC_INNER_EPILOG();
    return OBJECTREFToObject(refRetVal);
}

FCIMPL0(Object*, ThreadNative::GetCurrentThread)
{
    FCALL_CONTRACT;
    OBJECTHANDLE ExposedObject = GetThread()->m_ExposedObject;
    _ASSERTE(ExposedObject != 0); //Thread's constructor always initializes its GCHandle
    Object* result = *((Object**) ExposedObject);
    if (result != 0)
        return result;

    FC_INNER_RETURN(Object*, GetCurrentThreadHelper());
}
FCIMPLEND


FCIMPL3(void, ThreadNative::SetStart, ThreadBaseObject* pThisUNSAFE, Object* pDelegateUNSAFE, INT32 iRequestedStackSize)
{
    FCALL_CONTRACT;

    if (pThisUNSAFE==NULL)
        FCThrowResVoid(kNullReferenceException, W("NullReference_This"));

    THREADBASEREF   pThis       = (THREADBASEREF) pThisUNSAFE;
    OBJECTREF       pDelegate   = (OBJECTREF    ) pDelegateUNSAFE;

    HELPER_METHOD_FRAME_BEGIN_2(pThis, pDelegate);

    _ASSERTE(pThis != NULL);
    _ASSERTE(pDelegate != NULL); // Thread's constructor validates this

    if (pThis->m_InternalThread == NULL)
    {
        // if we don't have an internal Thread object associated with this exposed object,
        // now is our first opportunity to create one.
        Thread      *unstarted = SetupUnstartedThread();

        PREFIX_ASSUME(unstarted != NULL);

        if (GetThread()->GetDomain()->IgnoreUnhandledExceptions())
        {
            unstarted->SetThreadStateNC(Thread::TSNC_IgnoreUnhandledExceptions);
        }

        pThis->SetInternal(unstarted);
        pThis->SetManagedThreadId(unstarted->GetThreadId());
        unstarted->SetExposedObject(pThis);
        unstarted->RequestedThreadStackSize(iRequestedStackSize);
    }

    // save off the delegate
    pThis->SetDelegate(pDelegate);

    HELPER_METHOD_FRAME_END();
}
FCIMPLEND


// Set whether or not this is a background thread.
FCIMPL2(void, ThreadNative::SetBackground, ThreadBaseObject* pThisUNSAFE, CLR_BOOL isBackground)
{
    FCALL_CONTRACT;

    if (pThisUNSAFE==NULL)
        FCThrowResVoid(kNullReferenceException, W("NullReference_This"));

    // validate the thread
    Thread  *thread = pThisUNSAFE->GetInternal();

    if (ThreadIsDead(thread))
        FCThrowExVoid(kThreadStateException, IDS_EE_THREAD_DEAD_STATE, NULL, NULL, NULL);

    HELPER_METHOD_FRAME_BEGIN_0();

    thread->SetBackground(isBackground);

    HELPER_METHOD_FRAME_END();
}
FCIMPLEND

// Return whether or not this is a background thread.
FCIMPL1(FC_BOOL_RET, ThreadNative::IsBackground, ThreadBaseObject* pThisUNSAFE)
{
    FCALL_CONTRACT;

    if (pThisUNSAFE==NULL)
        FCThrowRes(kNullReferenceException, W("NullReference_This"));

    // validate the thread
    Thread  *thread = pThisUNSAFE->GetInternal();

    if (ThreadIsDead(thread))
        FCThrowEx(kThreadStateException, IDS_EE_THREAD_DEAD_STATE, NULL, NULL, NULL);

    FC_RETURN_BOOL(thread->IsBackground());
}
FCIMPLEND


// Deliver the state of the thread as a consistent set of bits.
// This copied in VM\EEDbgInterfaceImpl.h's
//     CorDebugUserState GetUserState( Thread *pThread )
// , so propogate changes to both functions
FCIMPL1(INT32, ThreadNative::GetThreadState, ThreadBaseObject* pThisUNSAFE)
{
    FCALL_CONTRACT;

    INT32               res = 0;
    Thread::ThreadState state;

    if (pThisUNSAFE==NULL)
        FCThrowRes(kNullReferenceException, W("NullReference_This"));

    // validate the thread.  Failure here implies that the thread was finalized
    // and then resurrected.
    Thread  *thread = pThisUNSAFE->GetInternal();

    if (!thread)
        FCThrowEx(kThreadStateException, IDS_EE_THREAD_CANNOT_GET, NULL, NULL, NULL);

    HELPER_METHOD_FRAME_BEGIN_RET_0();

    // grab a snapshot
    state = thread->GetSnapshotState();

    if (state & Thread::TS_Background)
        res |= ThreadBackground;

    if (state & Thread::TS_Unstarted)
        res |= ThreadUnstarted;

    // Don't report a StopRequested if the thread has actually stopped.
    if (state & Thread::TS_Dead)
    {
        if (state & Thread::TS_Aborted)
            res |= ThreadAborted;
        else
            res |= ThreadStopped;
    }
    else
    {
        if (state & Thread::TS_AbortRequested)
            res |= ThreadAbortRequested;
    }

    if (state & Thread::TS_Interruptible)
        res |= ThreadWaitSleepJoin;

    // Don't report a SuspendRequested if the thread has actually Suspended.
    if ((state & Thread::TS_UserSuspendPending) &&
        (state & Thread::TS_SyncSuspended)
       )
    {
        res |= ThreadSuspended;
    }
    else
    if (state & Thread::TS_UserSuspendPending)
    {
        res |= ThreadSuspendRequested;
    }

    HELPER_METHOD_POLL();
    HELPER_METHOD_FRAME_END();

    return res;
}
FCIMPLEND

#ifdef FEATURE_COMINTEROP_APARTMENT_SUPPORT

// Indicate whether the thread will host an STA (this may fail if the thread has
// already been made part of the MTA, use GetApartmentState or the return state
// from this routine to check for this).
FCIMPL3(INT32, ThreadNative::SetApartmentState, ThreadBaseObject* pThisUNSAFE, INT32 iState, CLR_BOOL fireMDAOnMismatch)
{
    FCALL_CONTRACT;

    if (pThisUNSAFE==NULL)
        FCThrowRes(kNullReferenceException, W("NullReference_This"));

    INT32           retVal  = ApartmentUnknown;
    BOOL    ok = TRUE;
    THREADBASEREF   pThis   = (THREADBASEREF) pThisUNSAFE;

    HELPER_METHOD_FRAME_BEGIN_RET_1(pThis);

    // Translate state input. ApartmentUnknown is not an acceptable input state.
    // Throw an exception here rather than pass it through to the internal
    // routine, which asserts.
    Thread::ApartmentState state = Thread::AS_Unknown;
    if (iState == ApartmentSTA)
        state = Thread::AS_InSTA;
    else if (iState == ApartmentMTA)
        state = Thread::AS_InMTA;
    else if (iState == ApartmentUnknown)
        state = Thread::AS_Unknown;
    else
        COMPlusThrow(kArgumentOutOfRangeException, W("ArgumentOutOfRange_Enum"));

    Thread  *thread = pThis->GetInternal();
    if (!thread)
        COMPlusThrow(kThreadStateException, IDS_EE_THREAD_CANNOT_GET);

    {
        pThis->EnterObjMonitor();

        // We can only change the apartment if the thread is unstarted or
        // running, and if it's running we have to be in the thread's
        // context.
        if ((!ThreadNotStarted(thread) && !ThreadIsRunning(thread)) ||
            (!ThreadNotStarted(thread) && (GetThread() != thread)))
            ok = FALSE;
        else
        {
            EX_TRY
            {
                state = thread->SetApartment(state, fireMDAOnMismatch == TRUE);
            }
            EX_CATCH
            {
                pThis->LeaveObjMonitor();
                EX_RETHROW;
            }
            EX_END_CATCH_UNREACHABLE;
        }

        pThis->LeaveObjMonitor();
    }


    // Now it's safe to throw exceptions again.
    if (!ok)
        COMPlusThrow(kThreadStateException);

    // Translate state back into external form
    if (state == Thread::AS_InSTA)
        retVal = ApartmentSTA;
    else if (state == Thread::AS_InMTA)
        retVal = ApartmentMTA;
    else if (state == Thread::AS_Unknown)
        retVal = ApartmentUnknown;
    else
        _ASSERTE(!"Invalid state returned from SetApartment");

    HELPER_METHOD_FRAME_END();

    return retVal;
}
FCIMPLEND

// Return whether the thread hosts an STA, is a member of the MTA or is not
// currently initialized for COM.
FCIMPL1(INT32, ThreadNative::GetApartmentState, ThreadBaseObject* pThisUNSAFE)
{
    FCALL_CONTRACT;

    INT32 retVal = 0;

    THREADBASEREF refThis = (THREADBASEREF) ObjectToOBJECTREF(pThisUNSAFE);

    HELPER_METHOD_FRAME_BEGIN_RET_1(refThis);

    if (refThis == NULL)
    {
        COMPlusThrow(kNullReferenceException, W("NullReference_This"));
    }

    Thread* thread = refThis->GetInternal();

    if (ThreadIsDead(thread))
    {
        COMPlusThrow(kThreadStateException, IDS_EE_THREAD_DEAD_STATE);
    }

    Thread::ApartmentState state = thread->GetApartment();

#ifdef FEATURE_COMINTEROP
    if (state == Thread::AS_Unknown)
    {
        // If the CLR hasn't started COM yet, start it up and attempt the call again.
        // We do this in order to minimize the number of situations under which we return
        // ApartmentState.Unknown to our callers.
        if (!g_fComStarted)
        {
            EnsureComStarted();
            state = thread->GetApartment();
        }
    }
#endif // FEATURE_COMINTEROP

    // Translate state into external form
    retVal = ApartmentUnknown;
    if (state == Thread::AS_InSTA)
    {
        retVal = ApartmentSTA;
    }
    else if (state == Thread::AS_InMTA)
    {
        retVal = ApartmentMTA;
    }
    else if (state == Thread::AS_Unknown)
    {
        retVal = ApartmentUnknown;
    }
    else
    {
        _ASSERTE(!"Invalid state returned from GetApartment");
    }

    HELPER_METHOD_FRAME_END();

    return retVal;
}
FCIMPLEND


// Attempt to eagerly set the apartment state during thread startup.
FCIMPL1(void, ThreadNative::StartupSetApartmentState, ThreadBaseObject* pThisUNSAFE)
{
    FCALL_CONTRACT;

    THREADBASEREF refThis = (THREADBASEREF) ObjectToOBJECTREF(pThisUNSAFE);

    HELPER_METHOD_FRAME_BEGIN_1(refThis);

    if (refThis == NULL)
    {
        COMPlusThrow(kNullReferenceException, W("NullReference_This"));
    }

    Thread* thread = refThis->GetInternal();

    if (!ThreadNotStarted(thread))
        COMPlusThrow(kThreadStateException, IDS_EE_THREADSTART_STATE);

    // Assert that the thread hasn't been started yet.
    _ASSERTE(Thread::TS_Unstarted & thread->GetSnapshotState());

    if ((g_pConfig != NULL) && !g_pConfig->LegacyApartmentInitPolicy())
    {
        Thread::ApartmentState as = thread->GetExplicitApartment();
        if (as == Thread::AS_Unknown)
        {
            thread->SetApartment(Thread::AS_InMTA, TRUE);
        }
    }

    HELPER_METHOD_FRAME_END();
}
FCIMPLEND

#endif // FEATURE_COMINTEROP_APARTMENT_SUPPORT

void ReleaseThreadExternalCount(Thread * pThread)
{
    WRAPPER_NO_CONTRACT;
    pThread->DecExternalCount(FALSE);
}

typedef Holder<Thread *, DoNothing, ReleaseThreadExternalCount> ThreadExternalCountHolder;

// Wait for the thread to die
BOOL ThreadNative::DoJoin(THREADBASEREF DyingThread, INT32 timeout)
{
    CONTRACTL
    {
        THROWS;
        GC_TRIGGERS;
        MODE_COOPERATIVE;
        PRECONDITION(DyingThread != NULL);
        PRECONDITION((timeout >= 0) || (timeout == INFINITE_TIMEOUT));
    }
    CONTRACTL_END;

    Thread * DyingInternal = DyingThread->GetInternal();

    // Validate the handle.  It's valid to Join a thread that's not running -- so
    // long as it was once started.
    if (DyingInternal == 0 ||
        !(DyingInternal->m_State & Thread::TS_LegalToJoin))
    {
        COMPlusThrow(kThreadStateException, IDS_EE_THREAD_NOTSTARTED);
    }

    // Don't grab the handle until we know it has started, to eliminate the race
    // condition.
    if (ThreadIsDead(DyingInternal) || !DyingInternal->HasValidThreadHandle())
        return TRUE;

    DWORD dwTimeOut32 = (timeout == INFINITE_TIMEOUT
                   ? INFINITE
                   : (DWORD) timeout);

    // There is a race here.  DyingThread is going to close its thread handle.
    // If we grab the handle and then DyingThread closes it, we will wait forever
    // in DoAppropriateWait.
    int RefCount = DyingInternal->IncExternalCount();
    if (RefCount == 1)
    {
        // !!! We resurrect the Thread Object.
        // !!! We will keep the Thread ref count to be 1 so that we will not try
        // !!! to destroy the Thread Object again.
        // !!! Do not call DecExternalCount here!
        _ASSERTE (!DyingInternal->HasValidThreadHandle());
        return TRUE;
    }

    ThreadExternalCountHolder dyingInternalHolder(DyingInternal);

    if (!DyingInternal->HasValidThreadHandle())
    {
        return TRUE;
    }

    GCX_PREEMP();
    DWORD rv = DyingInternal->JoinEx(dwTimeOut32, (WaitMode)(WaitMode_Alertable/*alertable*/|WaitMode_InDeadlock));

    switch(rv)
    {
        case WAIT_OBJECT_0:
            return TRUE;

        case WAIT_TIMEOUT:
            break;

        case WAIT_FAILED:
            if(!DyingInternal->HasValidThreadHandle())
                return TRUE;
            break;
            
        default:
            _ASSERTE(!"This return code is not understood \n");
            break;
    }    

    return FALSE;
}


// We don't get a constructor for ThreadBaseObject, so we rely on the fact that this
// method is only called once, out of SetStart.  Since SetStart is private/native
// and only called from the constructor, we'll only get called here once to set it
// up and once (with NULL) to tear it down.  The 'null' can only come from Finalize
// because the constructor throws if it doesn't get a valid delegate.
void ThreadBaseObject::SetDelegate(OBJECTREF delegate)
{
    CONTRACTL
    {
        GC_TRIGGERS;
        THROWS;
        MODE_COOPERATIVE;
    }
    CONTRACTL_END;

#ifdef APPDOMAIN_STATE
    if (delegate != NULL)
    {
        AppDomain *pDomain = delegate->GetAppDomain();
        Thread *pThread = GetInternal();
        AppDomain *kickoffDomain = pThread->GetKickOffDomain();
        _ASSERTE_ALL_BUILDS("clr/src/VM/COMSynchronizable.cpp", !pDomain || pDomain == kickoffDomain);
        _ASSERTE_ALL_BUILDS("clr/src/VM/COMSynchronizable.cpp", kickoffDomain == GetThread()->GetDomain());
    }
#endif

    SetObjectReferenceUnchecked( (OBJECTREF *)&m_Delegate, delegate );

    // If the delegate is being set then initialize the other data members.
    if (m_Delegate != NULL)
    {
        // Initialize the thread priority to normal.
        m_Priority = ThreadNative::PRIORITY_NORMAL;
    }
}


// If the exposed object is created after-the-fact, for an existing thread, we call
// InitExisting on it.  This is the other "construction", as opposed to SetDelegate.
void ThreadBaseObject::InitExisting()
{
    CONTRACTL
    {
        GC_NOTRIGGER;
        NOTHROW;
        MODE_COOPERATIVE;
    }
    CONTRACTL_END;

    Thread *pThread = GetInternal();
    _ASSERTE (pThread);
    switch (pThread->GetThreadPriority())
    {
    case THREAD_PRIORITY_LOWEST:
    case THREAD_PRIORITY_IDLE:
        m_Priority = ThreadNative::PRIORITY_LOWEST;
        break;

    case THREAD_PRIORITY_BELOW_NORMAL:
        m_Priority = ThreadNative::PRIORITY_BELOW_NORMAL;
        break;

    case THREAD_PRIORITY_NORMAL:
        m_Priority = ThreadNative::PRIORITY_NORMAL;
        break;

    case THREAD_PRIORITY_ABOVE_NORMAL:
        m_Priority = ThreadNative::PRIORITY_ABOVE_NORMAL;
        break;

    case THREAD_PRIORITY_HIGHEST:
    case THREAD_PRIORITY_TIME_CRITICAL:
        m_Priority = ThreadNative::PRIORITY_HIGHEST;
        break;

    case THREAD_PRIORITY_ERROR_RETURN:
        _ASSERTE(FALSE);
        m_Priority = ThreadNative::PRIORITY_NORMAL;
        break;

    default:
        m_Priority = ThreadNative::PRIORITY_NORMAL;
        break;
    }

}

#ifndef FEATURE_LEAK_CULTURE_INFO
OBJECTREF ThreadBaseObject::GetManagedThreadCulture(BOOL bUICulture)
{
    CONTRACTL {
        GC_NOTRIGGER;
        NOTHROW;
        MODE_COOPERATIVE;
    }
    CONTRACTL_END;

    // This is the case when we're building mscorlib and haven't yet created
    // the system assembly.
    if (SystemDomain::System()->SystemAssembly()==NULL || g_fForbidEnterEE) {
        return NULL;
    }

    OBJECTREF *pCurrentCulture = NULL;
    Thread    *pThread = GetInternal();
    FieldDesc *pFD = NULL;

    if (bUICulture)
    {
        pFD = pThread->managedThreadCurrentUICulture;
    }
    else
    {
        pFD = pThread->managedThreadCurrentCulture;
    }

    if (pFD != NULL)
    {
        pCurrentCulture = (OBJECTREF*)pThread->GetStaticFieldAddrNoCreate(pFD, NULL);
        if (pCurrentCulture)
        {
            return *pCurrentCulture;
        }
    }

    return NULL;
}

CULTUREINFOBASEREF ThreadBaseObject::GetCurrentUserCulture()
{
    WRAPPER_NO_CONTRACT;

    return (CULTUREINFOBASEREF)GetManagedThreadCulture(false);
}

CULTUREINFOBASEREF ThreadBaseObject::GetCurrentUICulture()
{
    WRAPPER_NO_CONTRACT;

    return (CULTUREINFOBASEREF)GetManagedThreadCulture(true);
}

// If the thread pool thread switched appdomains and the culture was set, the culture won't be
// reset for the second appdomain. It's impossible to do general cleanup of thread pool threads
// because we don't have the right extensible infrastructure for it. For example, if the second
// appdomain was in a different CLR you won't be able to reset the culture without introducing 
// new cross-CLR communication mechanism. However, note that this isn't a user scenario in 
// CoreCLR anyway.
void ThreadBaseObject::ResetCurrentUserCulture()
{
    WRAPPER_NO_CONTRACT;
    ResetManagedThreadCulture(false);
}

void ThreadBaseObject::ResetCurrentUICulture()
{
    WRAPPER_NO_CONTRACT;
    ResetManagedThreadCulture(true);
}

void ThreadBaseObject::ResetManagedThreadCulture(BOOL bUICulture)
{
    CONTRACTL
    {
        GC_NOTRIGGER;
        NOTHROW;
        MODE_COOPERATIVE;
        SO_TOLERANT;
    }
    CONTRACTL_END;

    // This is the case when we're building mscorlib and haven't yet created
    // the system assembly.
    if (SystemDomain::System()->SystemAssembly()==NULL || g_fForbidEnterEE) {
        return;
    }
    
    Thread    *pThread = GetInternal();
    FieldDesc *pFD = NULL;

    if (bUICulture)
    {
        pFD = pThread->managedThreadCurrentUICulture;
    }
    else
    {
        pFD = pThread->managedThreadCurrentCulture;
    }

    if (pFD != NULL)
    {
        OBJECTREF *pCulture = NULL;
        BEGIN_SO_INTOLERANT_CODE_NO_THROW_CHECK_THREAD(COMPlusThrowSO());
        pCulture = (OBJECTREF*)pThread->GetStaticFieldAddrNoCreate(pFD, NULL);
        if (pCulture) 
        {
            SetObjectReferenceUnchecked(pCulture, NULL);
        }
        END_SO_INTOLERANT_CODE;

    }
}

#endif // FEATURE_LEAK_CULTURE_INFO


FCIMPL1(void, ThreadNative::Finalize, ThreadBaseObject* pThisUNSAFE)
{
    FCALL_CONTRACT;

    // This function is intentionally blank.
    // See comment in code:MethodTable::CallFinalizer.

    _ASSERTE (!"Should not be called");

    FCUnique(0x21);
}
FCIMPLEND

#ifdef FEATURE_COMINTEROP
FCIMPL1(void, ThreadNative::DisableComObjectEagerCleanup, ThreadBaseObject* pThisUNSAFE)
{
    FCALL_CONTRACT;

    _ASSERTE(pThisUNSAFE != NULL);
    VALIDATEOBJECT(pThisUNSAFE);
    Thread *pThread = pThisUNSAFE->GetInternal();

    HELPER_METHOD_FRAME_BEGIN_0();

    if (pThread == NULL)
        COMPlusThrow(kThreadStateException, IDS_EE_THREAD_CANNOT_GET);

    pThread->SetDisableComObjectEagerCleanup();

    HELPER_METHOD_FRAME_END();
}
FCIMPLEND
#endif //FEATURE_COMINTEROP

#ifdef FEATURE_LEAK_CULTURE_INFO
FCIMPL1(FC_BOOL_RET, ThreadNative::SetThreadUILocale, StringObject* localeNameUNSAFE)
{
    FCALL_CONTRACT;

    BOOL result = TRUE;

    STRINGREF name = (STRINGREF) localeNameUNSAFE;
    VALIDATEOBJECTREF(name);

    HELPER_METHOD_FRAME_BEGIN_RET_0();
    
    LCID lcid=NewApis::LocaleNameToLCID(name->GetBuffer(),0);
    if (lcid == 0)
    {
        ThrowHR(HRESULT_FROM_WIN32(GetLastError()));
    }

#ifdef FEATURE_INCLUDE_ALL_INTERFACES
    IHostTaskManager *manager = CorHost2::GetHostTaskManager();
    if (manager) {
        BEGIN_SO_TOLERANT_CODE_CALLING_HOST(GetThread());
        result = (manager->SetUILocale(lcid) == S_OK);
        END_SO_TOLERANT_CODE_CALLING_HOST;
    }
#endif  // FEATURE_INCLUDE_ALL_INTERFACES

    HELPER_METHOD_FRAME_END();
   
    FC_RETURN_BOOL(result);
}
FCIMPLEND
#endif // FEATURE_LEAK_CULTURE_INFO

FCIMPL0(Object*, ThreadNative::GetDomain)
{
    FCALL_CONTRACT;

    APPDOMAINREF refRetVal = NULL;

    Thread* thread = GetThread();

    if ((thread) && (thread->GetDomain()))
    {
        HELPER_METHOD_FRAME_BEGIN_RET_1(refRetVal);
        refRetVal = (APPDOMAINREF) thread->GetDomain()->GetExposedObject();
        HELPER_METHOD_FRAME_END();
    }

    return OBJECTREFToObject(refRetVal);
}
FCIMPLEND

#ifdef _TARGET_X86_
__declspec(naked) LPVOID __fastcall ThreadNative::FastGetDomain()
{
    STATIC_CONTRACT_MODE_COOPERATIVE;
    STATIC_CONTRACT_GC_NOTRIGGER;
    STATIC_CONTRACT_NOTHROW;
    STATIC_CONTRACT_SO_TOLERANT;

    __asm {
        call GetAppDomain
        test eax, eax
        je done
        mov eax, dword ptr [eax]AppDomain.m_ExposedObject
        test eax, eax
        je done
        mov eax, dword ptr [eax]
done:
        ret
    }
}
#else // _TARGET_X86_
LPVOID F_CALL_CONV ThreadNative::FastGetDomain()
{
    CONTRACTL
    {
        GC_NOTRIGGER;
        NOTHROW;
        MODE_COOPERATIVE;
        SO_TOLERANT;
    }
    CONTRACTL_END;

    Thread *pThread;
    AppDomain *pDomain;
    OBJECTHANDLE ExposedObject;

    pDomain = GetAppDomain();
    if (!pDomain) {
        return NULL;
    }
    ExposedObject = pDomain->m_ExposedObject;
    if (ExposedObject) {
        return *(LPVOID *)ExposedObject;
    }
    return NULL;
}
#endif // _TARGET_X86_

#ifdef FEATURE_REMOTING
// This is just a helper method that lets BCL get to the managed context
// from the contextID.
FCIMPL1(Object*, ThreadNative::GetContextFromContextID, LPVOID ContextID)
{
    FCALL_CONTRACT;

    OBJECTREF   rv   = NULL;
    Context*    pCtx = (Context *) ContextID;
    // Get the managed context backing this unmanaged context
    rv = pCtx->GetExposedObjectRaw();

    // This assert maintains the following invariant:
    // Only default unmanaged contexts can have a null managed context
    // (All non-deafult contexts are created as managed contexts first, and then
    // hooked to the unmanaged context)
    _ASSERTE((rv != NULL) || (pCtx->GetDomain()->GetDefaultContext() == pCtx));

    return OBJECTREFToObject(rv);
}
FCIMPLEND


FCIMPL6(Object*, ThreadNative::InternalCrossContextCallback, ThreadBaseObject* refThis, ContextBaseObject* refContext, LPVOID contextID, INT32 appDomainId, Object* oDelegateUNSAFE, PtrArray* oArgsUNSAFE)
{
    FCALL_CONTRACT;

    _ASSERTE(refThis != NULL);
    VALIDATEOBJECT(refThis);
    Thread *pThread = refThis->GetInternal();
    Context *pCtx = (Context *)contextID;


    _ASSERTE(pCtx && (refContext == NULL || pCtx->GetExposedObjectRaw() == NULL ||
             ObjectToOBJECTREF(refContext) == pCtx->GetExposedObjectRaw()));
    LOG((LF_APPDOMAIN, LL_INFO1000, "ThreadNative::InternalCrossContextCallback: %p, %p\n", refContext, pCtx));
    // install our frame. We have to put it here before we put the helper frame on

    // Set the VM conext

    struct _gc {
        OBJECTREF oRetVal;
        OBJECTREF oDelegate;
        OBJECTREF oArgs;
        // We need to report the managed context object because it may become unreachable in the caller, 
        // however we have to keep it alive, otherwise its finalizer could free the unmanaged internal context
        OBJECTREF oContext;
    } gc;

    gc.oRetVal   = NULL;
    gc.oDelegate = ObjectToOBJECTREF(oDelegateUNSAFE);
    gc.oArgs     = ObjectToOBJECTREF(oArgsUNSAFE);
    gc.oContext  = ObjectToOBJECTREF(refContext);

    HELPER_METHOD_FRAME_BEGIN_RET_PROTECT(gc);

    if (pThread == NULL)
        COMPlusThrow(kThreadStateException, IDS_EE_THREAD_CANNOT_GET);

#ifdef _DEBUG
    MethodDesc* pTargetMD = COMDelegate::GetMethodDesc(gc.oDelegate);
    _ASSERTE(pTargetMD->IsStatic());
#endif

    // If we have a non-zero appDomain index, this is a x-domain call
    // We must verify that the AppDomain is not unloaded
    PREPARE_NONVIRTUAL_CALLSITE(METHOD__THREAD__COMPLETE_CROSSCONTEXTCALLBACK);

    AppDomainFromIDHolder ad;
    if (appDomainId != 0)
    {
        //
        // NOTE: there is a potential race between the time we retrieve the app domain pointer,
        // and the time which this thread enters the domain.
        //
        // To solve the race, we rely on the fact that there is a thread sync
        // between releasing an app domain's handle, and destroying the app domain.  Thus
        // it is important that we not go into preemptive gc mode in that window.
        //
        {
            ad.Assign(ADID(appDomainId), TRUE); 
            
            if (ad.IsUnloaded() || !ad->CanThreadEnter(pThread))
                COMPlusThrow(kAppDomainUnloadedException, W("Remoting_AppDomainUnloaded"));
        }
    }

    // Verify that the Context is valid.
    if ( !Context::ValidateContext(pCtx) )
        COMPlusThrow(kRemotingException, W("Remoting_InvalidContext"));

    DEBUG_ASSURE_NO_RETURN_BEGIN(COMSYNCH)

    FrameWithCookie<ContextTransitionFrame>  frame;

    Context*    pCurrContext    = pThread->GetContext();
    bool        fTransition     = (pCurrContext != pCtx);
    BOOL        fSameDomain     = (appDomainId==0) || (pCurrContext->GetDomain()->GetId() == (ADID)appDomainId);
    _ASSERTE( fTransition || fSameDomain);
    if (fTransition) 
        if (appDomainId!=0)
            ad->EnterContext(pThread,pCtx, &frame);
        else
            pThread->EnterContextRestricted(pCtx,&frame);
    ad.Release();


    LOG((LF_EH, LL_INFO100, "MSCORLIB_ENTER_CONTEXT( %s::%s ): %s\n",
        pTargetMD->m_pszDebugClassName,
        pTargetMD->m_pszDebugMethodName,
        fTransition ? "ENTERED" : "NOP"));

    Exception* pOriginalException=NULL;
        
    EX_TRY
    {
        DECLARE_ARGHOLDER_ARRAY(callArgs, 2);

#if CHECK_APP_DOMAIN_LEAKS
        // We're passing the delegate object to another appdomain
        // without marshaling, that is OK - it's a static function delegate
        // but we should mark it as agile then.
        gc.oDelegate->SetSyncBlockAppDomainAgile();
#endif
        callArgs[ARGNUM_0] = OBJECTREF_TO_ARGHOLDER(gc.oDelegate);
        callArgs[ARGNUM_1] = OBJECTREF_TO_ARGHOLDER(gc.oArgs);

        CATCH_HANDLER_FOUND_NOTIFICATION_CALLSITE;
        CALL_MANAGED_METHOD_RETREF(gc.oRetVal, OBJECTREF, callArgs);
    }
    EX_CATCH
    {
        LOG((LF_EH, LL_INFO100, "MSCORLIB_CONTEXT_TRANSITION(     %s::%s ): exception in flight\n", pTargetMD->m_pszDebugClassName, pTargetMD->m_pszDebugMethodName));

        if (!fTransition || fSameDomain)
        {
            if (fTransition)
            {
                GCX_FORBID();
                pThread->ReturnToContext(&frame);
            }
#ifdef FEATURE_TESTHOOKS
            if (appDomainId!=0)
            {
                TESTHOOKCALL(LeftAppDomain(appDomainId));
            }
#endif
            EX_RETHROW;
        }

        pOriginalException=EXTRACT_EXCEPTION();
        CAPTURE_BUCKETS_AT_TRANSITION(pThread, CLRException::GetThrowableFromException(pOriginalException));
        goto lAfterCtxUnwind;
    }
    EX_END_CATCH_UNREACHABLE;
    if (0)
    {
lAfterCtxUnwind:
        LOG((LF_EH, LL_INFO100, "MSCORLIB_RaiseCrossContextException( %s::%s )\n", pTargetMD->m_pszDebugClassName, pTargetMD->m_pszDebugMethodName));
        pThread->RaiseCrossContextException(pOriginalException,&frame);
    }

    LOG((LF_EH, LL_INFO100, "MSCORLIB_LEAVE_CONTEXT_TRANSITION( %s::%s )\n", pTargetMD->m_pszDebugClassName, pTargetMD->m_pszDebugMethodName));

    if (fTransition)
    {
        GCX_FORBID();
        pThread->ReturnToContext(&frame);
    }
#ifdef FEATURE_TESTHOOKS
    if(appDomainId!=0)
    {
        TESTHOOKCALL(LeftAppDomain(appDomainId));
    }
#endif

    DEBUG_ASSURE_NO_RETURN_END(COMSYNCH)

    HELPER_METHOD_FRAME_END();
    return OBJECTREFToObject(gc.oRetVal);
}
FCIMPLEND
#endif //FEATURE_REMOTING

//
// nativeGetSafeCulture is used when the culture get requested from the thread object. 
// we have to check the culture in the FCALL because in FCALL the thread cannot be 
// interrupted and unload other app domian.
// the concern here is if the thread hold a subclassed culture object and somebody 
// requested it from other app domain then we shouldn't hold any reference to that 
// culture object any time because the app domain created this culture may get 
// unloaded and this culture will survive although the type metadata will be unloaded 
// and GC will crash first time accessing this object after the app domain unload.
//
#ifdef FEATURE_LEAK_CULTURE_INFO
FCIMPL4(FC_BOOL_RET, ThreadNative::nativeGetSafeCulture, 
        ThreadBaseObject*   threadUNSAFE, 
        int                 appDomainId, 
        CLR_BOOL            isUI, 
        OBJECTREF*          safeCulture)
{
    FCALL_CONTRACT;

    THREADBASEREF thread(threadUNSAFE);

    CULTUREINFOBASEREF pCulture = isUI ? thread->GetCurrentUICulture() : thread->GetCurrentUserCulture();
    if (pCulture != NULL) {
        if (pCulture->IsSafeCrossDomain() || pCulture->GetCreatedDomainID() == ADID(appDomainId)) {
            SetObjectReference(safeCulture, pCulture, pCulture->GetAppDomain());
        } else {
            FC_RETURN_BOOL(FALSE);
        }
    }
    FC_RETURN_BOOL(TRUE);
}
FCIMPLEND
#endif // FEATURE_LEAK_CULTURE_INFO

#ifndef FEATURE_LEAK_CULTURE_INFO
void QCALLTYPE ThreadNative::nativeInitCultureAccessors()
{
    QCALL_CONTRACT;

    BEGIN_QCALL;

    Thread* pThread = GetThread();
    pThread->InitCultureAccessors();

    END_QCALL;
}
#endif // FEATURE_LEAK_CULTURE_INFO


void QCALLTYPE ThreadNative::InformThreadNameChange(QCall::ThreadHandle thread, LPCWSTR name, INT32 len)
{
    QCALL_CONTRACT;

    BEGIN_QCALL;

    Thread* pThread = &(*thread);

#ifdef PROFILING_SUPPORTED
    {
        BEGIN_PIN_PROFILER(CORProfilerTrackThreads());
        if (name == NULL)
        {
            g_profControlBlock.pProfInterface->ThreadNameChanged((ThreadID)pThread, 0, NULL);
        }
        else
        {
            g_profControlBlock.pProfInterface->ThreadNameChanged((ThreadID)pThread, len, (WCHAR*)name);
        }
        END_PIN_PROFILER();
    }
#endif // PROFILING_SUPPORTED


#ifdef DEBUGGING_SUPPORTED
    if (CORDebuggerAttached())
    {
        _ASSERTE(NULL != g_pDebugInterface);
        g_pDebugInterface->NameChangeEvent(NULL, pThread);
    }
#endif // DEBUGGING_SUPPORTED

    END_QCALL;
}

UINT64 QCALLTYPE ThreadNative::GetProcessDefaultStackSize()
{
    QCALL_CONTRACT;

    SIZE_T reserve = 0;
    SIZE_T commit = 0;

    BEGIN_QCALL;

    if (!Thread::GetProcessDefaultStackSize(&reserve, &commit))
        reserve = 1024 * 1024;

    END_QCALL;

    return (UINT64)reserve;
}

#ifndef FEATURE_CORECLR
FCIMPL0(void, ThreadNative::BeginCriticalRegion)
{
    FCALL_CONTRACT;
    if (CLRHosted())
    {
        GetThread()->BeginCriticalRegion_NoCheck();
    }
}
FCIMPLEND

FCIMPL0(void, ThreadNative::EndCriticalRegion)
{
    FCALL_CONTRACT;
    if (CLRHosted())
    {
        GetThread()->EndCriticalRegion_NoCheck();
    }
}
FCIMPLEND

FCIMPL0(void, ThreadNative::BeginThreadAffinity)
{
    FCALL_CONTRACT;
    Thread::BeginThreadAffinity();
}
FCIMPLEND

FCIMPL0(void, ThreadNative::EndThreadAffinity)
{
    FCALL_CONTRACT;
    Thread::EndThreadAffinity();
}
FCIMPLEND
#endif // !FEATURE_CORECLR


FCIMPL1(FC_BOOL_RET, ThreadNative::IsThreadpoolThread, ThreadBaseObject* thread)
{
    FCALL_CONTRACT;

    if (thread==NULL)
        FCThrowRes(kNullReferenceException, W("NullReference_This"));

    Thread *pThread = thread->GetInternal();

    if (pThread == NULL)
        FCThrowEx(kThreadStateException, IDS_EE_THREAD_DEAD_STATE, NULL, NULL, NULL);

    BOOL ret = pThread->IsThreadPoolThread();

    FC_GC_POLL_RET();

    FC_RETURN_BOOL(ret);
}
FCIMPLEND


FCIMPL1(void, ThreadNative::SpinWait, int iterations)
{
    FCALL_CONTRACT;

    //
    // If we're not going to spin for long, it's ok to remain in cooperative mode.
    // The threshold is determined by the cost of entering preemptive mode; if we're
    // spinning for less than that number of cycles, then switching to preemptive
    // mode won't help a GC start any faster.  That number is right around 1000000 
    // on my machine.
    //
    if (iterations <= 1000000)
    {
        for(int i = 0; i < iterations; i++)
            YieldProcessor();
        return;
    }

    //
    // Too many iterations; better switch to preemptive mode to avoid stalling a GC.
    //
    HELPER_METHOD_FRAME_BEGIN_NOPOLL();
    GCX_PREEMP();

    for(int i = 0; i < iterations; i++)
        YieldProcessor();

    HELPER_METHOD_FRAME_END();
}
FCIMPLEND

BOOL QCALLTYPE ThreadNative::YieldThread()
{
    QCALL_CONTRACT;

    BOOL ret = FALSE;

    BEGIN_QCALL

    ret = __SwitchToThread(0, CALLER_LIMITS_SPINNING);

    END_QCALL

    return ret;
}

#ifdef FEATURE_COMPRESSEDSTACK
FCIMPL2(void*, ThreadNative::SetAppDomainStack, ThreadBaseObject* pThis, SafeHandle* hcsUNSAFE)
{
    FCALL_CONTRACT;

    void* pRet = NULL;
    SAFEHANDLE hcsSAFE = (SAFEHANDLE) hcsUNSAFE;
    HELPER_METHOD_FRAME_BEGIN_RET_1(hcsSAFE);


    void* unmanagedCompressedStack = NULL;
    if (hcsSAFE != NULL)
    {
        unmanagedCompressedStack = (void *)hcsSAFE->GetHandle();
    }


    VALIDATEOBJECT(pThis);
    Thread *pThread = pThis->GetInternal();
    if (pThread == NULL)
        COMPlusThrow(kThreadStateException, IDS_EE_THREAD_CANNOT_GET);

    pRet = StackCompressor::SetAppDomainStack(pThread, unmanagedCompressedStack);
    HELPER_METHOD_FRAME_END_POLL();
    return pRet;
}
FCIMPLEND


FCIMPL2(void, ThreadNative::RestoreAppDomainStack, ThreadBaseObject* pThis, void* appDomainStack)
{
    FCALL_CONTRACT;

    HELPER_METHOD_FRAME_BEGIN_NOPOLL();

    VALIDATEOBJECT(pThis);
    Thread *pThread = pThis->GetInternal();
    if (pThread == NULL)
        COMPlusThrow(kThreadStateException, IDS_EE_THREAD_CANNOT_GET);

    StackCompressor::RestoreAppDomainStack(pThread, appDomainStack);
    HELPER_METHOD_FRAME_END_POLL();
}
FCIMPLEND
#endif //#ifdef FEATURE_COMPRESSEDSTACK

FCIMPL0(void, ThreadNative::FCMemoryBarrier)
{
    FCALL_CONTRACT;

    MemoryBarrier();
    FC_GC_POLL();
}
FCIMPLEND

FCIMPL2(void, ThreadNative::SetAbortReason, ThreadBaseObject* pThisUNSAFE, Object* pObject)
{
    FCALL_CONTRACT;

    if (pThisUNSAFE==NULL)
        FCThrowResVoid(kNullReferenceException, W("NullReference_This"));

    OBJECTREF refObject = static_cast<OBJECTREF>(pObject);

    Thread *pThread = pThisUNSAFE->GetInternal();

    // If the OBJECTHANDLE is not 0, already set so just return
    if (pThread != NULL && pThread->m_AbortReason != 0)
        return;

    // Set up a frame in case of GC or EH
    HELPER_METHOD_FRAME_BEGIN_1(refObject)

    if (pThread == NULL)
        COMPlusThrow(kThreadStateException, IDS_EE_THREAD_CANNOT_GET);

    // Get the AppDomain ID for the AppDomain on the currently running thread.
    //  NOTE: the currently running thread may be different from this thread object!
    AppDomain *pCurrentDomain = GetThread()->GetDomain();
    ADID adid = pCurrentDomain->GetId();

    // Create a OBJECTHANDLE for the object.
    OBJECTHANDLE oh = pCurrentDomain->CreateHandle(refObject);

    // Scope the lock to peeking at and updating the two fields on the Thread object.
    {   // Atomically check whether the OBJECTHANDLE has been set, and if not,
        //  store it and the ADID of the object.
        //  NOTE: get the lock on this thread object, not on the executing thread.
        Thread::AbortRequestLockHolder lock(pThread);
        if (pThread->m_AbortReason == 0)
        {
            pThread->m_AbortReason = oh;
            pThread->m_AbortReasonDomainID = adid;
            // Set the OBJECTHANDLE so we can know that we stored it on the Thread object.
            oh = 0;
        }
    }

    // If the OBJECTHANDLE created above was not stored onto the Thread object, then
    //  another thread beat this one to the update.  Destroy the OBJECTHANDLE that
    //  was not used, created above.
    if (oh != 0)
    {
        DestroyHandle(oh);
    }

    HELPER_METHOD_FRAME_END()

}
FCIMPLEND

#ifndef FEATURE_CORECLR // core clr does not support abort reason 
FCIMPL1(Object*, ThreadNative::GetAbortReason, ThreadBaseObject *pThisUNSAFE)
{
    FCALL_CONTRACT;

    if (pThisUNSAFE==NULL)
        FCThrowRes(kNullReferenceException, W("NullReference_This"));

    OBJECTREF refRetVal = NULL;
    Thread   *pThread   = pThisUNSAFE->GetInternal();

    // Set up a frame in case of GC or EH
    HELPER_METHOD_FRAME_BEGIN_RET_1(refRetVal)

    if (pThread == NULL)
        COMPlusThrow(kThreadStateException, IDS_EE_THREAD_CANNOT_GET);

    // While the ExceptionInfo probably will be *set* from a different
    //  thread, it should only be *read* from the current thread.
    _ASSERTE(GetThread() == pThread);

    // Set cooperative mode, to avoid AD unload while we're working.
    GCX_COOP();

    OBJECTHANDLE oh=NULL;
    ADID adid;
    // Scope the lock to reading the two fields on the Thread object.
    {   // Atomically get the OBJECTHANDLE and ADID of the object
        //  NOTE: get the lock on this thread object, not on the executing thread.
        Thread::AbortRequestLockHolder lock(pThread);
        oh = pThread->m_AbortReason;
        adid = pThread->m_AbortReasonDomainID;
    }

    // If the OBJECTHANDLE is not 0...
    if (oh != 0)
    {

        AppDomain *pCurrentDomain = pThread->GetDomain();
        // See if the appdomain is equal to the appdomain of the currently running
        //  thread.  

        if (pCurrentDomain->GetId() == adid)
        {   // Same appdomain; just return object from the OBJECTHANDLE
            refRetVal = ObjectFromHandle(oh);
        }
        else
        {   // Otherwise, try to marshal the object from the other AppDomain
            ENTER_DOMAIN_ID(adid);
            CrossAppDomainClonerCallback cadcc;
            ObjectClone Cloner(&cadcc, CrossAppDomain, FALSE);
            refRetVal = Cloner.Clone(ObjectFromHandle(oh), GetAppDomain(), pCurrentDomain, NULL);
            Cloner.RemoveGCFrames();
            END_DOMAIN_TRANSITION;
        }
    }

    HELPER_METHOD_FRAME_END()

    return OBJECTREFToObject(refRetVal);
}
FCIMPLEND
#endif // !FEATURE_CORECLR

FCIMPL1(void, ThreadNative::ClearAbortReason, ThreadBaseObject* pThisUNSAFE)
{
    FCALL_CONTRACT;

    if (pThisUNSAFE==NULL)
        FCThrowResVoid(kNullReferenceException, W("NullReference_This"));

    Thread *pThread = pThisUNSAFE->GetInternal();

    // Clearing from managed code can only happen on the current thread.
    _ASSERTE(pThread == GetThread());

    HELPER_METHOD_FRAME_BEGIN_0();

    if (pThread == NULL)
        COMPlusThrow(kThreadStateException, IDS_EE_THREAD_CANNOT_GET);

    pThread->ClearAbortReason();

    HELPER_METHOD_FRAME_END();

}
FCIMPLEND