Remove hosting methods that always return false (#9930)

* Remove CLRIoCompletionHosted as it always returns false.
* Remove CLRSyncHosted as it always returns false.
* Remove CLRMemoryHosted as it always returns false.
* Remove CLRTaskHosted as it always returns false.
* Remove CLRAssemblyHosted, CLRGCHosted,and CLRSecurityHosted.
They are not called.
* Remove IsThreadPoolHosted as it always returns false.
* Remove EnterRuntime and LeaveRuntime, as they do nothing.
* Add back calls to RevertIfImpersonated and GCX_PREEMP.

I accidentally deleted the call to RevertIfImpersonated instead of just
removing an extra parameter.

When I removed the HR_LEAVE_RUNTIME_HOLDER macro from windowsruntime.h,
I not only removed a LeaveRuntimeHolder but also a GCX_PREEMP. So I added
it back. The holder and GCX_PREEMP where only inserted when the
FEATURE_LEAVE_RUNTIME_HOLDER macro was defined. Since it is always defined,
I removed it. Also as I understand it, you would always want to have a
GCX_PREEMP before calling into the Windows API as not to block the GC,
so I'm not sure why you would want to disable it.

1 files changed, 3 insertions, 37 deletions

diff --git a/src/vm/crst.cpp b/src/vm/crst.cpp
index 9613798f93..36447e2232 100644
--- a/src/vm/crst.cpp
+++ b/src/vm/crst.cpp
@@ -33,25 +33,7 @@ VOID CrstBase::InitWorker(INDEBUG_COMMA(CrstType crstType) CrstFlags flags)
     CONTRACTL {
         THROWS;
         WRAPPER(GC_TRIGGERS);
-    } CONTRACTL_END;    
-
-    // Disallow creation of Crst before EE starts.  But only complain if we end up
-    // being hosted, since such Crsts have escaped the hosting net and will cause
-    // AVs on next use.
-#ifdef _DEBUG
-    static bool fEarlyInit; // = false
-
-    if (!g_fEEStarted)
-    {
-        if (!CLRSyncHosted())
-            fEarlyInit = true;
-    }
-
-    // If we are now hosted, we better not have *ever* created some Crsts that are
-    // not known to our host.
-    _ASSERTE(!fEarlyInit || !CLRSyncHosted());
-
-#endif
+    } CONTRACTL_END;
 
     _ASSERTE((flags & CRST_INITIALIZED) == 0);
     
@@ -328,16 +310,7 @@ void CrstBase::Enter(INDEBUG(NoLevelCheckFlag noLevelCheckFlag/* = CRST_LEVEL_CH
         }
     }
 
-    {
-        if (CLRTaskHosted()) 
-        {
-            Thread::BeginThreadAffinity();
-        }
-
-        UnsafeEnterCriticalSection(&m_criticalsection);
-
-    }
-
+    UnsafeEnterCriticalSection(&m_criticalsection);
 
 #ifdef _DEBUG
     PostEnter();
@@ -370,14 +343,7 @@ void CrstBase::Leave()
     Thread * pThread = GetThread();
 #endif
 
-    {
-        UnsafeLeaveCriticalSection(&m_criticalsection);
-
-
-        if (CLRTaskHosted()) {
-            Thread::EndThreadAffinity();
-        }
-    }
+    UnsafeLeaveCriticalSection(&m_criticalsection);
 
     // Check for both rare case using one if-check
     if (m_dwFlags & (CRST_TAKEN_DURING_SHUTDOWN | CRST_DEBUGGER_THREAD))