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Issue #1971 - Part 2: Update ICU source to 63.2.

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Job Bautista 2022-07-24 21:03:27 +08:00 • committed by roytam1
commit 1e69214382
3160 changed files with 275815 additions and 234203 deletions
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71
intl/icu/source/common/sharedobject.cpp
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@ -1,4 +1,4 @@
// Copyright (C) 2016 and later: Unicode, Inc. and others.
// © 2016 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html
/*
******************************************************************************
@ -8,7 +8,10 @@
* sharedobject.cpp
*/
#include "sharedobject.h"
#include "mutex.h"
#include "uassert.h"
#include "umutex.h"
#include "unifiedcache.h"
U_NAMESPACE_BEGIN
@ -17,69 +20,41 @@ SharedObject::~SharedObject() {}
UnifiedCacheBase::~UnifiedCacheBase() {}
void
SharedObject::addRef(UBool fromWithinCache) const {
umtx_atomic_inc(&totalRefCount);
// Although items in use may not be correct immediately, it
// will be correct eventually.
if (umtx_atomic_inc(&hardRefCount) == 1 && cachePtr != NULL) {
// If this object is cached, and the hardRefCount goes from 0 to 1,
// then the increment must happen from within the cache while the
// cache global mutex is locked. In this way, we can be rest assured
// that data races can't happen if the cache performs some task if
// the hardRefCount is zero while the global cache mutex is locked.
(void)fromWithinCache; // Suppress unused variable warning in non-debug builds.
U_ASSERT(fromWithinCache);
cachePtr->incrementItemsInUse();
}
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(UBool fromWithinCache) const {
UBool decrementItemsInUse = (umtx_atomic_dec(&hardRefCount) == 0);
UBool allReferencesGone = (umtx_atomic_dec(&totalRefCount) == 0);
// Although items in use may not be correct immediately, it
// will be correct eventually.
if (decrementItemsInUse && cachePtr != NULL) {
if (fromWithinCache) {
cachePtr->decrementItemsInUse();
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 {
cachePtr->decrementItemsInUseWithLockingAndEviction();
delete this;
}
}
if (allReferencesGone) {
delete this;
}
}
void
SharedObject::addSoftRef() const {
umtx_atomic_inc(&totalRefCount);
++softRefCount;
}
void
SharedObject::removeSoftRef() const {
--softRefCount;
if (umtx_atomic_dec(&totalRefCount) == 0) {
delete this;
}
}
int32_t
SharedObject::getRefCount() const {
return umtx_loadAcquire(totalRefCount);
}
int32_t
SharedObject::getHardRefCount() const {
return umtx_loadAcquire(hardRefCount);
}
void
SharedObject::deleteIfZeroRefCount() const {
if(getRefCount() == 0) {
if (this->cachePtr == nullptr && getRefCount() == 0) {
delete this;
}
}