1 files changed, 96 insertions, 0 deletions
diff --git a/src/vm/listlock.cpp b/src/vm/listlock.cpp
new file mode 100644
index 0000000000..450e85aef5
--- /dev/null
+++ b/src/vm/listlock.cpp
@@ -0,0 +1,96 @@
+// 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.
+// ===========================================================================
+// File: ListLock.cpp
+// 
+
+// 
+// ===========================================================================
+// This file decribes the list lock and deadlock aware list lock.
+// ===========================================================================
+
+
+#include "common.h"
+#include "listlock.h"
+#include "listlock.inl"
+
+ListLockEntry::ListLockEntry(ListLock *pList, void *pData, const char *description)
+  : m_deadlock(description),
+    m_pList(pList),
+    m_pData(pData),
+    m_Crst(CrstListLock,
+           (CrstFlags)(CRST_REENTRANCY | (pList->IsHostBreakable()?CRST_HOST_BREAKABLE:0))),
+    m_pszDescription(description),
+    m_pNext(NULL),
+    m_dwRefCount(1),
+    m_hrResultCode(S_FALSE),
+    m_hInitException(NULL),
+    m_pLoaderAllocator(NULL)
+#ifdef FEATURE_CORRUPTING_EXCEPTIONS
+    ,
+    m_CorruptionSeverity(NotCorrupting)
+#endif // FEATURE_CORRUPTING_EXCEPTIONS
+{
+    WRAPPER_NO_CONTRACT;
+}
+
+ListLockEntry *ListLockEntry::Find(ListLock* pLock, LPVOID pPointer, const char *description)
+{
+    CONTRACTL
+    {
+        THROWS;
+        GC_NOTRIGGER;
+        MODE_ANY;
+    }
+    CONTRACTL_END;
+
+    _ASSERTE(pLock->HasLock());
+
+    ListLockEntry *pEntry = pLock->Find(pPointer);
+    if (pEntry==NULL)
+    {
+        pEntry = new ListLockEntry(pLock, pPointer, description);
+        pLock->AddElement(pEntry);
+    }
+    else
+        pEntry->AddRef();
+
+    return pEntry;
+};
+
+void ListLockEntry::AddRef()
+{
+    CONTRACTL
+    {
+        NOTHROW;
+        GC_NOTRIGGER;
+        MODE_ANY;
+        PRECONDITION(CheckPointer(this));
+    }
+    CONTRACTL_END;
+
+    FastInterlockIncrement((LONG*)&m_dwRefCount);
+}
+
+void ListLockEntry::Release()
+{
+    CONTRACTL
+    {
+        NOTHROW;
+        GC_TRIGGERS;
+        MODE_ANY;
+        PRECONDITION(CheckPointer(this));
+    }
+    CONTRACTL_END;
+
+    ListLockHolder lock(m_pList);
+
+    if (FastInterlockDecrement((LONG*)&m_dwRefCount) == 0)
+    {
+        // Remove from list
+        m_pList->Unlink(this);
+        delete this;
+    }
+};
+