1 files changed, 70 insertions, 0 deletions
diff --git a/AVStream/avscamera/sys/Mutex.cpp b/AVStream/avscamera/sys/Mutex.cpp
new file mode 100644
index 00000000..1dd3d88c
--- /dev/null
+++ b/AVStream/avscamera/sys/Mutex.cpp
@@ -0,0 +1,70 @@
+/**************************************************************************
+
+    A/V Stream Camera Sample
+
+    Copyright (c) 2013, Microsoft Corporation.
+
+    File:
+
+        Mutex.cpp
+
+    Abstract:
+
+        This file provides the implementation of KMutex and KScopedMutex.
+        
+        KMutex provides a wrapper around a KMUTEX object.  KScopedMutex is
+        provided as a helper class to ensure all exits release the lock.
+
+    History:
+
+        created 7/16/2013
+
+**************************************************************************/
+
+#include "Common.h"
+
+//
+//  Dummy dtor.  Required because the dtor is virtual.
+//
+KMutex::~KMutex()
+{}
+
+//
+//  Preferred lock method.
+//
+_IRQL_requires_min_(PASSIVE_LEVEL)
+_When_((Timeout==NULL || Timeout->QuadPart!=0), _IRQL_requires_max_(APC_LEVEL))
+_When_((Timeout!=NULL &&Timeout->QuadPart==0), _IRQL_requires_max_(DISPATCH_LEVEL))
+NTSTATUS
+KMutex::Lock(
+    _In_opt_ PLARGE_INTEGER Timeout
+)
+{
+    //DBG_ENTER(": Thread Owner = %p", m_Lock.OwnerThread);
+
+    NTSTATUS status =
+        KeWaitForSingleObject(
+            &m_Lock,
+            Executive,
+            KernelMode,
+            FALSE,
+            Timeout );
+
+    //DBG_LEAVE(": Status = %d Thread Owner = %p", status, m_Lock.OwnerThread);
+
+    return status;
+}
+
+//
+//  Preferred unlock method.
+//
+_IRQL_requires_max_(DISPATCH_LEVEL)
+void
+KMutex::Unlock()
+{
+    //DBG_ENTER(": Thread Owner = %p", m_Lock.OwnerThread);
+
+    KeReleaseMutex( &m_Lock, FALSE );
+
+    //DBG_LEAVE(": Thread Owner = %p", m_Lock.OwnerThread);
+}