From 36d22d82aa202bb199967e9512281e9a53db42c9 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 21:33:14 +0200 Subject: Adding upstream version 115.7.0esr. Signed-off-by: Daniel Baumann --- intl/icu/source/common/sharedobject.cpp | 62 +++++++++++++++++++++++++++++++++ 1 file changed, 62 insertions(+) create mode 100644 intl/icu/source/common/sharedobject.cpp (limited to 'intl/icu/source/common/sharedobject.cpp') diff --git a/intl/icu/source/common/sharedobject.cpp b/intl/icu/source/common/sharedobject.cpp new file mode 100644 index 0000000000..6eeca8605f --- /dev/null +++ b/intl/icu/source/common/sharedobject.cpp @@ -0,0 +1,62 @@ +// © 2016 and later: Unicode, Inc. and others. +// License & terms of use: http://www.unicode.org/copyright.html +/* +****************************************************************************** +* Copyright (C) 2015, International Business Machines +* Corporation and others. All Rights Reserved. +****************************************************************************** +* sharedobject.cpp +*/ +#include "sharedobject.h" +#include "mutex.h" +#include "uassert.h" +#include "umutex.h" +#include "unifiedcache.h" + +U_NAMESPACE_BEGIN + +SharedObject::~SharedObject() {} + +UnifiedCacheBase::~UnifiedCacheBase() {} + +void +SharedObject::addRef() const { + umtx_atomic_inc(&hardRefCount); +} + +// removeRef Decrement the reference count and delete if it is zero. +// Note that SharedObjects with a non-null cachePtr are owned by the +// unified cache, and the cache will be responsible for the actual deletion. +// The deletion could be as soon as immediately following the +// update to the reference count, if another thread is running +// a cache eviction cycle concurrently. +// NO ACCESS TO *this PERMITTED AFTER REFERENCE COUNT == 0 for cached objects. +// THE OBJECT MAY ALREADY BE GONE. +void +SharedObject::removeRef() const { + const UnifiedCacheBase *cache = this->cachePtr; + int32_t updatedRefCount = umtx_atomic_dec(&hardRefCount); + U_ASSERT(updatedRefCount >= 0); + if (updatedRefCount == 0) { + if (cache) { + cache->handleUnreferencedObject(); + } else { + delete this; + } + } +} + + +int32_t +SharedObject::getRefCount() const { + return umtx_loadAcquire(hardRefCount); +} + +void +SharedObject::deleteIfZeroRefCount() const { + if (this->cachePtr == nullptr && getRefCount() == 0) { + delete this; + } +} + +U_NAMESPACE_END -- cgit v1.2.3