88 lines
2.4 KiB
C++
88 lines
2.4 KiB
C++
// © 2016 and later: Unicode, Inc. and others.
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// License & terms of use: http://www.unicode.org/copyright.html
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/*
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******************************************************************************
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* Copyright (C) 2015, International Business Machines
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* Corporation and others. All Rights Reserved.
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******************************************************************************
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* sharedobject.cpp
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*/
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#include "sharedobject.h"
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#include "uassert.h"
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U_NAMESPACE_BEGIN
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SharedObject::~SharedObject() {}
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UnifiedCacheBase::~UnifiedCacheBase() {}
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void
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SharedObject::addRef(UBool fromWithinCache) const {
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umtx_atomic_inc(&totalRefCount);
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// Although items in use may not be correct immediately, it
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// will be correct eventually.
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if (umtx_atomic_inc(&hardRefCount) == 1 && cachePtr != NULL) {
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// If this object is cached, and the hardRefCount goes from 0 to 1,
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// then the increment must happen from within the cache while the
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// cache global mutex is locked. In this way, we can be rest assured
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// that data races can't happen if the cache performs some task if
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// the hardRefCount is zero while the global cache mutex is locked.
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(void)fromWithinCache; // Suppress unused variable warning in non-debug builds.
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U_ASSERT(fromWithinCache);
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cachePtr->incrementItemsInUse();
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}
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}
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void
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SharedObject::removeRef(UBool fromWithinCache) const {
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UBool decrementItemsInUse = (umtx_atomic_dec(&hardRefCount) == 0);
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UBool allReferencesGone = (umtx_atomic_dec(&totalRefCount) == 0);
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// Although items in use may not be correct immediately, it
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// will be correct eventually.
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if (decrementItemsInUse && cachePtr != NULL) {
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if (fromWithinCache) {
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cachePtr->decrementItemsInUse();
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} else {
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cachePtr->decrementItemsInUseWithLockingAndEviction();
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}
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}
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if (allReferencesGone) {
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delete this;
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}
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}
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void
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SharedObject::addSoftRef() const {
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umtx_atomic_inc(&totalRefCount);
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++softRefCount;
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}
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void
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SharedObject::removeSoftRef() const {
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--softRefCount;
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if (umtx_atomic_dec(&totalRefCount) == 0) {
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delete this;
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}
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}
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int32_t
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SharedObject::getRefCount() const {
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return umtx_loadAcquire(totalRefCount);
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}
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int32_t
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SharedObject::getHardRefCount() const {
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return umtx_loadAcquire(hardRefCount);
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}
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void
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SharedObject::deleteIfZeroRefCount() const {
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if(getRefCount() == 0) {
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delete this;
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}
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}
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U_NAMESPACE_END
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