Line data    Source code

       1             : // © 2016 and later: Unicode, Inc. and others.
       2             : // License & terms of use: http://www.unicode.org/copyright.html
       3             : /*
       4             : ******************************************************************************
       5             : * Copyright (C) 2015, International Business Machines
       6             : * Corporation and others.  All Rights Reserved.
       7             : ******************************************************************************
       8             : * sharedobject.cpp
       9             : */
      10             : #include "sharedobject.h"
      11             : #include "uassert.h"
      12             : 
      13             : U_NAMESPACE_BEGIN
      14             : 
      15           0 : SharedObject::~SharedObject() {}
      16             : 
      17           0 : UnifiedCacheBase::~UnifiedCacheBase() {}
      18             : 
      19             : void
      20           0 : SharedObject::addRef(UBool fromWithinCache) const {
      21           0 :     umtx_atomic_inc(&totalRefCount);
      22             : 
      23             :     // Although items in use may not be correct immediately, it
      24             :     // will be correct eventually.
      25           0 :     if (umtx_atomic_inc(&hardRefCount) == 1 && cachePtr != NULL) {
      26             :         // If this object is cached, and the hardRefCount goes from 0 to 1,
      27             :         // then the increment must happen from within the cache while the
      28             :         // cache global mutex is locked. In this way, we can be rest assured
      29             :         // that data races can't happen if the cache performs some task if
      30             :         // the hardRefCount is zero while the global cache mutex is locked.
      31             :         (void)fromWithinCache;   // Suppress unused variable warning in non-debug builds.
      32           0 :         U_ASSERT(fromWithinCache);
      33           0 :         cachePtr->incrementItemsInUse();
      34             :     }
      35           0 : }
      36             : 
      37             : void
      38           0 : SharedObject::removeRef(UBool fromWithinCache) const {
      39           0 :     UBool decrementItemsInUse = (umtx_atomic_dec(&hardRefCount) == 0);
      40           0 :     UBool allReferencesGone = (umtx_atomic_dec(&totalRefCount) == 0);
      41             : 
      42             :     // Although items in use may not be correct immediately, it
      43             :     // will be correct eventually.
      44           0 :     if (decrementItemsInUse && cachePtr != NULL) {
      45           0 :         if (fromWithinCache) {
      46           0 :             cachePtr->decrementItemsInUse();
      47             :         } else {
      48           0 :             cachePtr->decrementItemsInUseWithLockingAndEviction();
      49             :         }
      50             :     }
      51           0 :     if (allReferencesGone) {
      52           0 :         delete this;
      53             :     }
      54           0 : }
      55             : 
      56             : void
      57           0 : SharedObject::addSoftRef() const {
      58           0 :     umtx_atomic_inc(&totalRefCount);
      59           0 :     ++softRefCount;
      60           0 : }
      61             : 
      62             : void
      63           0 : SharedObject::removeSoftRef() const {
      64           0 :     --softRefCount;
      65           0 :     if (umtx_atomic_dec(&totalRefCount) == 0) {
      66           0 :         delete this;
      67             :     }
      68           0 : }
      69             : 
      70             : int32_t
      71           0 : SharedObject::getRefCount() const {
      72           0 :     return umtx_loadAcquire(totalRefCount);
      73             : }
      74             : 
      75             : int32_t
      76           0 : SharedObject::getHardRefCount() const {
      77           0 :     return umtx_loadAcquire(hardRefCount);
      78             : }
      79             : 
      80             : void
      81           0 : SharedObject::deleteIfZeroRefCount() const {
      82           0 :     if(getRefCount() == 0) {
      83           0 :         delete this;
      84             :     }
      85           0 : }
      86             : 
      87             : U_NAMESPACE_END