Update ICU to 54.1 step 1

source/common/sharedobject.cpp

Index: source/common/sharedobject.cpp
diff --git a/source/common/sharedobject.cpp b/source/common/sharedobject.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..6affcd09cd5035395b43f22cdb395db5ef845d6c
--- /dev/null
+++ b/source/common/sharedobject.cpp
@@ -0,0 +1,59 @@
+/*
+******************************************************************************
+* Copyright (C) 2014, International Business Machines
+* Corporation and others.  All Rights Reserved.
+******************************************************************************
+* sharedobject.cpp
+*/
+#include "sharedobject.h"
+
+U_NAMESPACE_BEGIN
+SharedObject::~SharedObject() {}
+
+void
+SharedObject::addRef() const {
+    umtx_atomic_inc(&totalRefCount);
+}
+
+void
+SharedObject::removeRef() const {
+    if(umtx_atomic_dec(&totalRefCount) == 0) {
+        delete this;
+    }
+}
+
+void
+SharedObject::addSoftRef() const {
+    addRef();
+    umtx_atomic_inc(&softRefCount);
+}
+
+void
+SharedObject::removeSoftRef() const {
+    umtx_atomic_dec(&softRefCount);
+    removeRef();
+}
+
+UBool
+SharedObject::allSoftReferences() const {
+    return umtx_loadAcquire(totalRefCount) == umtx_loadAcquire(softRefCount);
+}
+
+int32_t
+SharedObject::getRefCount() const {
+    return umtx_loadAcquire(totalRefCount);
+}
+
+int32_t
+SharedObject::getSoftRefCount() const {
+    return umtx_loadAcquire(softRefCount);
+}
+
+void
+SharedObject::deleteIfZeroRefCount() const {
+    if(getRefCount() == 0) {
+        delete this;
+    }
+}
+
+U_NAMESPACE_END