1 files changed, 90 insertions, 0 deletions
diff --git a/src/vm/threaddebugblockinginfo.cpp b/src/vm/threaddebugblockinginfo.cpp
new file mode 100644
index 0000000000..a903693cac
--- /dev/null
+++ b/src/vm/threaddebugblockinginfo.cpp
@@ -0,0 +1,90 @@
+// 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.
+// ThreadDebugBlockingInfo.cpp
+//
+
+//
+//
+#include "common.h"
+#include "threaddebugblockinginfo.h"
+
+//Constructor
+ThreadDebugBlockingInfo::ThreadDebugBlockingInfo()
+{
+    m_firstBlockingItem = NULL;
+}
+
+//Destructor
+ThreadDebugBlockingInfo::~ThreadDebugBlockingInfo()
+{
+    WRAPPER_NO_CONTRACT;
+    _ASSERTE(m_firstBlockingItem == NULL);
+}
+
+// Adds a new blocking item at the front of the list
+// The caller is responsible for allocating the memory this points to and keeping it alive until
+// after PopBlockingItem is called
+#ifndef DACCESS_COMPILE
+VOID ThreadDebugBlockingInfo::PushBlockingItem(DebugBlockingItem *pItem)
+{
+    LIMITED_METHOD_CONTRACT;
+
+    _ASSERTE(pItem != NULL);
+    pItem->pNext = m_firstBlockingItem;
+    m_firstBlockingItem = pItem;
+}
+#endif //!DACCESS_COMPILE
+
+// Removes the most recently added item (FIFO)
+#ifndef DACCESS_COMPILE
+VOID ThreadDebugBlockingInfo::PopBlockingItem()
+{
+    LIMITED_METHOD_CONTRACT;
+
+    _ASSERTE(m_firstBlockingItem != NULL);
+    m_firstBlockingItem = m_firstBlockingItem->pNext;
+}
+#endif //!DACCESS_COMPILE
+
+// Calls the visitor function on each item in the stack from front to back
+#ifdef DACCESS_COMPILE
+VOID ThreadDebugBlockingInfo::VisitBlockingItems(DebugBlockingItemVisitor visitorFunc, VOID* pUserData)
+{
+    CONTRACTL
+    {
+        NOTHROW;
+        GC_NOTRIGGER;
+        MODE_ANY;
+    }
+    CONTRACTL_END;
+
+    SUPPORTS_DAC;
+
+    PTR_DebugBlockingItem pItem = m_firstBlockingItem;
+    while(pItem != NULL)
+    {
+        visitorFunc(pItem, pUserData);
+        pItem = pItem->pNext;
+    }
+}
+#endif //DACCESS_COMPILE
+
+// Holder constructor pushes a blocking item on the blocking info stack
+#ifndef DACCESS_COMPILE
+DebugBlockingItemHolder::DebugBlockingItemHolder(Thread *pThread, DebugBlockingItem *pItem) :
+m_pThread(pThread)
+{
+    LIMITED_METHOD_CONTRACT;
+    pThread->DebugBlockingInfo.PushBlockingItem(pItem);
+}
+#endif //DACCESS_COMPILE
+
+// Holder destructor pops a blocking item off the blocking info stack
+#ifndef DACCESS_COMPILE
+DebugBlockingItemHolder::~DebugBlockingItemHolder()
+{
+    LIMITED_METHOD_CONTRACT;
+    m_pThread->DebugBlockingInfo.PopBlockingItem();
+}
+#endif //DACCESS_COMPILE