ovr_sdk

annotate LibOVR/Src/Kernel/OVR_RefCount.cpp @ 0:1b39a1b46319

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initial 0.4.4
author John Tsiombikas <nuclear@member.fsf.org>
date Wed, 14 Jan 2015 06:51:16 +0200
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nuclear@0 1 /************************************************************************************
nuclear@0 2
nuclear@0 3 Filename : OVR_RefCount.cpp
nuclear@0 4 Content : Reference counting implementation
nuclear@0 5 Created : September 19, 2012
nuclear@0 6 Notes :
nuclear@0 7
nuclear@0 8 Copyright : Copyright 2014 Oculus VR, LLC All Rights reserved.
nuclear@0 9
nuclear@0 10 Licensed under the Oculus VR Rift SDK License Version 3.2 (the "License");
nuclear@0 11 you may not use the Oculus VR Rift SDK except in compliance with the License,
nuclear@0 12 which is provided at the time of installation or download, or which
nuclear@0 13 otherwise accompanies this software in either electronic or hard copy form.
nuclear@0 14
nuclear@0 15 You may obtain a copy of the License at
nuclear@0 16
nuclear@0 17 http://www.oculusvr.com/licenses/LICENSE-3.2
nuclear@0 18
nuclear@0 19 Unless required by applicable law or agreed to in writing, the Oculus VR SDK
nuclear@0 20 distributed under the License is distributed on an "AS IS" BASIS,
nuclear@0 21 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
nuclear@0 22 See the License for the specific language governing permissions and
nuclear@0 23 limitations under the License.
nuclear@0 24
nuclear@0 25 ************************************************************************************/
nuclear@0 26
nuclear@0 27 #include "OVR_RefCount.h"
nuclear@0 28 #include "OVR_Atomic.h"
nuclear@0 29 #include "OVR_Log.h"
nuclear@0 30
nuclear@0 31 namespace OVR {
nuclear@0 32
nuclear@0 33 #ifdef OVR_CC_ARM
nuclear@0 34 void* ReturnArg0(void* p)
nuclear@0 35 {
nuclear@0 36 return p;
nuclear@0 37 }
nuclear@0 38 #endif
nuclear@0 39
nuclear@0 40 // ***** Reference Count Base implementation
nuclear@0 41
nuclear@0 42 RefCountImplCore::~RefCountImplCore()
nuclear@0 43 {
nuclear@0 44 // RefCount can be either 1 or 0 here.
nuclear@0 45 // 0 if Release() was properly called.
nuclear@0 46 // 1 if the object was declared on stack or as an aggregate.
nuclear@0 47 OVR_ASSERT(RefCount <= 1);
nuclear@0 48 }
nuclear@0 49
nuclear@0 50 #ifdef OVR_BUILD_DEBUG
nuclear@0 51 void RefCountImplCore::reportInvalidDelete(void *pmem)
nuclear@0 52 {
nuclear@0 53 OVR_DEBUG_LOG(
nuclear@0 54 ("Invalid delete call on ref-counted object at %p. Please use Release()", pmem));
nuclear@0 55 OVR_ASSERT(0);
nuclear@0 56 }
nuclear@0 57 #endif
nuclear@0 58
nuclear@0 59 RefCountNTSImplCore::~RefCountNTSImplCore()
nuclear@0 60 {
nuclear@0 61 // RefCount can be either 1 or 0 here.
nuclear@0 62 // 0 if Release() was properly called.
nuclear@0 63 // 1 if the object was declared on stack or as an aggregate.
nuclear@0 64 OVR_ASSERT(RefCount <= 1);
nuclear@0 65 }
nuclear@0 66
nuclear@0 67 #ifdef OVR_BUILD_DEBUG
nuclear@0 68 void RefCountNTSImplCore::reportInvalidDelete(void *pmem)
nuclear@0 69 {
nuclear@0 70 OVR_DEBUG_LOG(
nuclear@0 71 ("Invalid delete call on ref-counted object at %p. Please use Release()", pmem));
nuclear@0 72 OVR_ASSERT(0);
nuclear@0 73 }
nuclear@0 74 #endif
nuclear@0 75
nuclear@0 76
nuclear@0 77 // *** Thread-Safe RefCountImpl
nuclear@0 78
nuclear@0 79 void RefCountImpl::AddRef()
nuclear@0 80 {
nuclear@0 81 AtomicOps<int>::ExchangeAdd_NoSync(&RefCount, 1);
nuclear@0 82 }
nuclear@0 83 void RefCountImpl::Release()
nuclear@0 84 {
nuclear@0 85 if ((AtomicOps<int>::ExchangeAdd_NoSync(&RefCount, -1) - 1) == 0)
nuclear@0 86 delete this;
nuclear@0 87 }
nuclear@0 88
nuclear@0 89 // *** Thread-Safe RefCountVImpl w/virtual AddRef/Release
nuclear@0 90
nuclear@0 91 void RefCountVImpl::AddRef()
nuclear@0 92 {
nuclear@0 93 AtomicOps<int>::ExchangeAdd_NoSync(&RefCount, 1);
nuclear@0 94 }
nuclear@0 95 void RefCountVImpl::Release()
nuclear@0 96 {
nuclear@0 97 if ((AtomicOps<int>::ExchangeAdd_NoSync(&RefCount, -1) - 1) == 0)
nuclear@0 98 delete this;
nuclear@0 99 }
nuclear@0 100
nuclear@0 101 // *** NON-Thread-Safe RefCountImpl
nuclear@0 102
nuclear@0 103 void RefCountNTSImpl::Release() const
nuclear@0 104 {
nuclear@0 105 RefCount--;
nuclear@0 106 if (RefCount == 0)
nuclear@0 107 delete this;
nuclear@0 108 }
nuclear@0 109
nuclear@0 110
nuclear@0 111 } // OVR