Quelle test_objectMonitor.cpp Sprache: C

/*
* Copyright (c) 2018, 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.
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*/

#include "precompiled.hpp"
#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) {
   // We were able to determine the L1 data cache line size so
   // do some cache line specific sanity checks
   EXPECT_EQ((size_t) 0, sizeof (PaddedEnd<ObjectMonitor>) % cache_line_size)
        << "PaddedEnd size is not a "
        << "multiple of a cache line which permits false sharing. "
        << "sizeof(PaddedEnd) = "
        << sizeof (PaddedEnd<ObjectMonitor>)
        << "; cache_line_size = " << cache_line_size;

   EXPECT_GE((size_t) ObjectMonitor::owner_offset_in_bytes(), cache_line_size)
        << "the _header and _owner fields are closer "
        << "than a cache line which permits false sharing.";
  }
}

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