1 files changed, 145 insertions, 0 deletions
diff --git a/src/gc/env/gcenv.sync.h b/src/gc/env/gcenv.sync.h
new file mode 100644
index 0000000000..d6bee05a19
--- /dev/null
+++ b/src/gc/env/gcenv.sync.h
@@ -0,0 +1,145 @@
+// 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.
+
+// -----------------------------------------------------------------------------------------------------------
+//
+// Helper classes expected by the GC
+//
+#define CRST_REENTRANCY         0
+#define CRST_UNSAFE_SAMELEVEL   0
+#define CRST_UNSAFE_ANYMODE     0
+#define CRST_DEBUGGER_THREAD    0
+#define CRST_DEFAULT            0
+
+#define CrstHandleTable         0
+
+typedef int CrstFlags;
+typedef int CrstType;
+
+class CrstStatic
+{
+    CLRCriticalSection m_cs;
+#ifdef _DEBUG
+    EEThreadId m_holderThreadId;
+#endif
+
+public:
+    bool InitNoThrow(CrstType eType, CrstFlags eFlags = CRST_DEFAULT)
+    {
+        m_cs.Initialize();
+        return true;
+    }
+
+    void Destroy()
+    {
+        m_cs.Destroy();
+    }
+
+    void Enter()
+    {
+        m_cs.Enter();
+#ifdef _DEBUG
+        m_holderThreadId.SetToCurrentThread();
+#endif
+    }
+
+    void Leave()
+    {
+#ifdef _DEBUG
+        m_holderThreadId.Clear();
+#endif
+        m_cs.Leave();
+    }
+
+#ifdef _DEBUG
+    EEThreadId GetHolderThreadId()
+    {
+        return m_holderThreadId;
+    }
+
+    bool OwnedByCurrentThread()
+    {
+        return GetHolderThreadId().IsCurrentThread();
+    }
+#endif
+};
+
+class CrstHolder
+{
+    CrstStatic * m_pLock;
+
+public:
+    CrstHolder(CrstStatic * pLock)
+        : m_pLock(pLock)
+    {
+        m_pLock->Enter();
+    }
+
+    ~CrstHolder()
+    {
+        m_pLock->Leave();
+    }
+};
+
+class CrstHolderWithState
+{
+    CrstStatic * m_pLock;
+    bool m_fAcquired;
+
+public:
+    CrstHolderWithState(CrstStatic * pLock, bool fAcquire = true)
+        : m_pLock(pLock), m_fAcquired(fAcquire)
+    {
+        if (fAcquire)
+            m_pLock->Enter();
+    }
+
+    ~CrstHolderWithState()
+    {
+        if (m_fAcquired)
+            m_pLock->Leave();
+    }
+
+    void Acquire()
+    {
+        if (!m_fAcquired)
+        {
+            m_pLock->Enter();
+            m_fAcquired = true;
+        }
+    }
+
+    void Release()
+    {
+        if (m_fAcquired)
+        {
+            m_pLock->Leave();
+            m_fAcquired = false;
+        }
+    }
+
+    CrstStatic * GetValue()
+    {
+        return m_pLock;
+    }
+};
+
+class CLREventStatic
+{
+public:
+    bool CreateAutoEventNoThrow(bool bInitialState);
+    bool CreateManualEventNoThrow(bool bInitialState);
+    bool CreateOSAutoEventNoThrow(bool bInitialState);
+    bool CreateOSManualEventNoThrow(bool bInitialState);
+
+    void CloseEvent();
+    bool IsValid() const;
+    bool Set();
+    bool Reset();
+    uint32_t Wait(uint32_t dwMilliseconds, bool bAlertable);
+
+private:
+    HANDLE  m_hEvent;
+    bool    m_fInitialized;
+};