nuclear@1: /************************************************************************************
nuclear@1: 
nuclear@1: Filename    :   OVR_RefCount.cpp
nuclear@1: Content     :   Reference counting implementation
nuclear@1: Created     :   September 19, 2012
nuclear@1: Notes       : 
nuclear@1: 
nuclear@1: Copyright   :   Copyright 2012 Oculus VR, Inc. All Rights reserved.
nuclear@1: 
nuclear@1: Use of this software is subject to the terms of the Oculus license
nuclear@1: agreement provided at the time of installation or download, or which
nuclear@1: otherwise accompanies this software in either electronic or hard copy form.
nuclear@1: 
nuclear@1: ************************************************************************************/
nuclear@1: 
nuclear@1: #include "OVR_RefCount.h"
nuclear@1: #include "OVR_Atomic.h"
nuclear@1: #include "OVR_Log.h"
nuclear@1: 
nuclear@1: namespace OVR {
nuclear@1: 
nuclear@1: #ifdef OVR_CC_ARM
nuclear@1: void* ReturnArg0(void* p)
nuclear@1: {
nuclear@1:     return p;
nuclear@1: }
nuclear@1: #endif
nuclear@1: 
nuclear@1: // ***** Reference Count Base implementation
nuclear@1: 
nuclear@1: RefCountImplCore::~RefCountImplCore()
nuclear@1: {
nuclear@1:     // RefCount can be either 1 or 0 here.
nuclear@1:     //  0 if Release() was properly called.
nuclear@1:     //  1 if the object was declared on stack or as an aggregate.
nuclear@1:     OVR_ASSERT(RefCount <= 1);
nuclear@1: }
nuclear@1: 
nuclear@1: #ifdef OVR_BUILD_DEBUG
nuclear@1: void RefCountImplCore::reportInvalidDelete(void *pmem)
nuclear@1: {
nuclear@1:     OVR_DEBUG_LOG(
nuclear@1:         ("Invalid delete call on ref-counted object at %p. Please use Release()", pmem));
nuclear@1:     OVR_ASSERT(0);
nuclear@1: }
nuclear@1: #endif
nuclear@1: 
nuclear@1: RefCountNTSImplCore::~RefCountNTSImplCore()
nuclear@1: {
nuclear@1:     // RefCount can be either 1 or 0 here.
nuclear@1:     //  0 if Release() was properly called.
nuclear@1:     //  1 if the object was declared on stack or as an aggregate.
nuclear@1:     OVR_ASSERT(RefCount <= 1);
nuclear@1: }
nuclear@1: 
nuclear@1: #ifdef OVR_BUILD_DEBUG
nuclear@1: void RefCountNTSImplCore::reportInvalidDelete(void *pmem)
nuclear@1: {
nuclear@1:     OVR_DEBUG_LOG(
nuclear@1:         ("Invalid delete call on ref-counted object at %p. Please use Release()", pmem));
nuclear@1:     OVR_ASSERT(0);
nuclear@1: }
nuclear@1: #endif
nuclear@1: 
nuclear@1: 
nuclear@1: // *** Thread-Safe RefCountImpl
nuclear@1: 
nuclear@1: void    RefCountImpl::AddRef()
nuclear@1: {
nuclear@1:     AtomicOps<int>::ExchangeAdd_NoSync(&RefCount, 1);
nuclear@1: }
nuclear@1: void    RefCountImpl::Release()
nuclear@1: {
nuclear@1:     if ((AtomicOps<int>::ExchangeAdd_NoSync(&RefCount, -1) - 1) == 0)
nuclear@1:         delete this;
nuclear@1: }
nuclear@1: 
nuclear@1: // *** Thread-Safe RefCountVImpl w/virtual AddRef/Release
nuclear@1: 
nuclear@1: void    RefCountVImpl::AddRef()
nuclear@1: {
nuclear@1:     AtomicOps<int>::ExchangeAdd_NoSync(&RefCount, 1);
nuclear@1: }
nuclear@1: void    RefCountVImpl::Release()
nuclear@1: {
nuclear@1:     if ((AtomicOps<int>::ExchangeAdd_NoSync(&RefCount, -1) - 1) == 0)
nuclear@1:         delete this;
nuclear@1: }
nuclear@1: 
nuclear@1: // *** NON-Thread-Safe RefCountImpl
nuclear@1: 
nuclear@1: void    RefCountNTSImpl::Release() const
nuclear@1: {
nuclear@1:     RefCount--;
nuclear@1:     if (RefCount == 0)
nuclear@1:         delete this;
nuclear@1: }
nuclear@1: 
nuclear@1: 
nuclear@1: } // OVR