47 lines
1.9 KiB
C++
47 lines
1.9 KiB
C++
/*
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* Copyright (c) 2018, 2023, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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#include "precompiled.hpp"
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#include "runtime/objectMonitor.hpp"
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#include "runtime/vm_version.hpp"
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#include "unittest.hpp"
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TEST_VM(ObjectMonitor, sanity) {
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uint cache_line_size = VM_Version::L1_data_cache_line_size();
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if (cache_line_size != 0) {
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// We were able to determine the L1 data cache line size so
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// do some cache line specific sanity checks
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EXPECT_EQ((size_t) 0, sizeof (PaddedEnd<ObjectMonitor>) % cache_line_size)
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<< "PaddedEnd<ObjectMonitor> size is not a "
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<< "multiple of a cache line which permits false sharing. "
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<< "sizeof(PaddedEnd<ObjectMonitor>) = "
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<< sizeof (PaddedEnd<ObjectMonitor>)
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<< "; cache_line_size = " << cache_line_size;
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EXPECT_GE((size_t) in_bytes(ObjectMonitor::owner_offset()), cache_line_size)
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<< "the _header and _owner fields are closer "
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<< "than a cache line which permits false sharing.";
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}
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}
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