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+///////////////////////////////////////////////////////////////////////////////
+// Copyright (c) Electronic Arts Inc. All rights reserved.
+///////////////////////////////////////////////////////////////////////////////
+
+
+#include <EASTL/internal/config.h>
+#include <EASTL/internal/thread_support.h>
+#include <EASTL/type_traits.h>
+#include <EASTL/memory.h>
+
+#if defined(EA_PLATFORM_MICROSOFT)
+	EA_DISABLE_ALL_VC_WARNINGS();
+	#ifndef WIN32_LEAN_AND_MEAN
+		#define WIN32_LEAN_AND_MEAN
+	#endif
+	#include <Windows.h>
+	EA_RESTORE_ALL_VC_WARNINGS();
+#endif
+
+
+namespace eastl
+{
+	namespace Internal
+	{
+		#if EASTL_CPP11_MUTEX_ENABLED
+			// We use the C++11 Standard Library mutex as-is.
+		#else
+			/////////////////////////////////////////////////////////////////
+			// mutex
+			/////////////////////////////////////////////////////////////////
+
+			mutex::mutex()
+			{
+				#if defined(EA_PLATFORM_MICROSOFT)
+					static_assert(sizeof(mMutexBuffer) == sizeof(CRITICAL_SECTION), "mMutexBuffer size failure");
+					//static_assert(EA_ALIGN_OF(mMutexBuffer) >= EA_ALIGN_OF(CRITICAL_SECTION), "mMutexBuffer alignment failure"); // Enabling this causes the VS2012 compiler to crash.
+
+					#if !defined(_WIN32_WINNT) || (_WIN32_WINNT < 0x0403)
+						InitializeCriticalSection((CRITICAL_SECTION*)mMutexBuffer);
+					#elif !EA_WINAPI_FAMILY_PARTITION(EA_WINAPI_PARTITION_DESKTOP)
+						BOOL result = InitializeCriticalSectionEx((CRITICAL_SECTION*)mMutexBuffer, 10, 0);
+						EASTL_ASSERT(result != 0); EA_UNUSED(result);
+					#else
+						BOOL result = InitializeCriticalSectionAndSpinCount((CRITICAL_SECTION*)mMutexBuffer, 10);
+						EASTL_ASSERT(result != 0); EA_UNUSED(result);
+					#endif
+
+				#elif defined(EA_PLATFORM_POSIX)
+					pthread_mutexattr_t attr;
+
+					pthread_mutexattr_init(&attr);
+
+					#if defined(EA_HAVE_pthread_mutexattr_setpshared_DECL)
+						pthread_mutexattr_setpshared(&attr, PTHREAD_PROCESS_PRIVATE);
+					#endif
+
+					pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);
+					pthread_mutex_init(&mMutex, &attr);
+					pthread_mutexattr_destroy(&attr);
+				#endif
+			}
+
+			mutex::~mutex()
+			{
+				#if defined(EA_PLATFORM_MICROSOFT)
+					DeleteCriticalSection((CRITICAL_SECTION*)mMutexBuffer);
+				#elif defined(EA_PLATFORM_POSIX)
+					pthread_mutex_destroy(&mMutex);
+				#endif
+			}
+
+			void mutex::lock()
+			{
+				#if defined(EA_PLATFORM_MICROSOFT)
+					EnterCriticalSection((CRITICAL_SECTION*)mMutexBuffer);
+				#elif defined(EA_PLATFORM_POSIX)
+					pthread_mutex_lock(&mMutex);
+				#else
+					EASTL_FAIL_MSG("EASTL thread safety is not implemented yet. See EAThread for how to do this for the given platform.");
+				#endif
+			}
+
+			void mutex::unlock()
+			{
+				#if defined(EA_PLATFORM_MICROSOFT)
+					LeaveCriticalSection((CRITICAL_SECTION*)mMutexBuffer);
+				#elif defined(EA_PLATFORM_POSIX)
+					pthread_mutex_unlock(&mMutex);
+				#endif
+			}
+		#endif
+
+
+		/////////////////////////////////////////////////////////////////
+		// shared_ptr_auto_mutex
+		/////////////////////////////////////////////////////////////////
+
+		// We could solve this by having single global mutex for all shared_ptrs, a set of mutexes for shared_ptrs, 
+		// a single mutex for every shared_ptr, or have a template parameter that enables mutexes for just some shared_ptrs.
+		eastl::late_constructed<mutex, true> gSharedPtrMutex;
+
+		shared_ptr_auto_mutex::shared_ptr_auto_mutex(const void* /*pSharedPtr*/)
+			: auto_mutex(*gSharedPtrMutex.get())
+		{
+		}
+
+
+	} // namespace Internal
+
+} // namespace eastl
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