nuclear@0: /************************************************************************************
nuclear@0: 
nuclear@0: Filename    :   OVR_RefCount.cpp
nuclear@0: Content     :   Reference counting implementation
nuclear@0: Created     :   September 19, 2012
nuclear@0: Notes       : 
nuclear@0: 
nuclear@0: Copyright   :   Copyright 2014 Oculus VR, LLC All Rights reserved.
nuclear@0: 
nuclear@0: Licensed under the Oculus VR Rift SDK License Version 3.2 (the "License"); 
nuclear@0: you may not use the Oculus VR Rift SDK except in compliance with the License, 
nuclear@0: which is provided at the time of installation or download, or which 
nuclear@0: otherwise accompanies this software in either electronic or hard copy form.
nuclear@0: 
nuclear@0: You may obtain a copy of the License at
nuclear@0: 
nuclear@0: http://www.oculusvr.com/licenses/LICENSE-3.2 
nuclear@0: 
nuclear@0: Unless required by applicable law or agreed to in writing, the Oculus VR SDK 
nuclear@0: distributed under the License is distributed on an "AS IS" BASIS,
nuclear@0: WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
nuclear@0: See the License for the specific language governing permissions and
nuclear@0: limitations under the License.
nuclear@0: 
nuclear@0: ************************************************************************************/
nuclear@0: 
nuclear@0: #include "OVR_RefCount.h"
nuclear@0: #include "OVR_Atomic.h"
nuclear@0: #include "OVR_Log.h"
nuclear@0: 
nuclear@0: namespace OVR {
nuclear@0: 
nuclear@0: #ifdef OVR_CC_ARM
nuclear@0: void* ReturnArg0(void* p)
nuclear@0: {
nuclear@0:     return p;
nuclear@0: }
nuclear@0: #endif
nuclear@0: 
nuclear@0: // ***** Reference Count Base implementation
nuclear@0: 
nuclear@0: RefCountImplCore::~RefCountImplCore()
nuclear@0: {
nuclear@0:     // RefCount can be either 1 or 0 here.
nuclear@0:     //  0 if Release() was properly called.
nuclear@0:     //  1 if the object was declared on stack or as an aggregate.
nuclear@0:     OVR_ASSERT(RefCount <= 1);
nuclear@0: }
nuclear@0: 
nuclear@0: #ifdef OVR_BUILD_DEBUG
nuclear@0: void RefCountImplCore::reportInvalidDelete(void *pmem)
nuclear@0: {
nuclear@0:     OVR_DEBUG_LOG(
nuclear@0:         ("Invalid delete call on ref-counted object at %p. Please use Release()", pmem));
nuclear@0:     OVR_ASSERT(0);
nuclear@0: }
nuclear@0: #endif
nuclear@0: 
nuclear@0: RefCountNTSImplCore::~RefCountNTSImplCore()
nuclear@0: {
nuclear@0:     // RefCount can be either 1 or 0 here.
nuclear@0:     //  0 if Release() was properly called.
nuclear@0:     //  1 if the object was declared on stack or as an aggregate.
nuclear@0:     OVR_ASSERT(RefCount <= 1);
nuclear@0: }
nuclear@0: 
nuclear@0: #ifdef OVR_BUILD_DEBUG
nuclear@0: void RefCountNTSImplCore::reportInvalidDelete(void *pmem)
nuclear@0: {
nuclear@0:     OVR_DEBUG_LOG(
nuclear@0:         ("Invalid delete call on ref-counted object at %p. Please use Release()", pmem));
nuclear@0:     OVR_ASSERT(0);
nuclear@0: }
nuclear@0: #endif
nuclear@0: 
nuclear@0: 
nuclear@0: // *** Thread-Safe RefCountImpl
nuclear@0: 
nuclear@0: void    RefCountImpl::AddRef()
nuclear@0: {
nuclear@0:     AtomicOps<int>::ExchangeAdd_NoSync(&RefCount, 1);
nuclear@0: }
nuclear@0: void    RefCountImpl::Release()
nuclear@0: {
nuclear@0:     if ((AtomicOps<int>::ExchangeAdd_NoSync(&RefCount, -1) - 1) == 0)
nuclear@0:         delete this;
nuclear@0: }
nuclear@0: 
nuclear@0: // *** Thread-Safe RefCountVImpl w/virtual AddRef/Release
nuclear@0: 
nuclear@0: void    RefCountVImpl::AddRef()
nuclear@0: {
nuclear@0:     AtomicOps<int>::ExchangeAdd_NoSync(&RefCount, 1);
nuclear@0: }
nuclear@0: void    RefCountVImpl::Release()
nuclear@0: {
nuclear@0:     if ((AtomicOps<int>::ExchangeAdd_NoSync(&RefCount, -1) - 1) == 0)
nuclear@0:         delete this;
nuclear@0: }
nuclear@0: 
nuclear@0: // *** NON-Thread-Safe RefCountImpl
nuclear@0: 
nuclear@0: void    RefCountNTSImpl::Release() const
nuclear@0: {
nuclear@0:     RefCount--;
nuclear@0:     if (RefCount == 0)
nuclear@0:         delete this;
nuclear@0: }
nuclear@0: 
nuclear@0: 
nuclear@0: } // OVR