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/*
* Copyright (c) 2018, 2025, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
#include "runtime/objectMonitor.hpp"
#include "runtime/vm_version.hpp"
#include "unittest.hpp"
TEST_VM(ObjectMonitor, sanity) {
uint cache_line_size = VM_Version::L1_data_cache_line_size();
if (cache_line_size != 0) {
EXPECT_EQ(in_bytes(ObjectMonitor::metadata_offset()), 0)
<< "_metadata at a non 0 offset. metadata_offset = "
<< in_bytes(ObjectMonitor::metadata_offset());
EXPECT_GE((size_t) in_bytes(ObjectMonitor::owner_offset()), cache_line_size)
<< "the _metadata and _owner fields are closer "
<< "than a cache line which permits false sharing.";
EXPECT_GE((size_t) in_bytes(ObjectMonitor::recursions_offset() - ObjectMonitor::owner_offset()), cache_line_size)
<< "the _owner and _recursions fields are closer "
<< "than a cache line which permits false sharing.";
}
}
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