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78b80150e0
Co-authored-by: Patricio Chilano Mateo <pchilanomate@openjdk.org> Co-authored-by: Alan Bateman <alanb@openjdk.org> Co-authored-by: Andrew Haley <aph@openjdk.org> Co-authored-by: Fei Yang <fyang@openjdk.org> Co-authored-by: Coleen Phillimore <coleenp@openjdk.org> Co-authored-by: Richard Reingruber <rrich@openjdk.org> Co-authored-by: Martin Doerr <mdoerr@openjdk.org> Reviewed-by: aboldtch, dholmes, coleenp, fbredberg, dlong, sspitsyn
52 lines
1.7 KiB
C++
52 lines
1.7 KiB
C++
/*
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* Copyright (c) 2022, 2024, 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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*/
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#include "precompiled.hpp"
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#include "runtime/atomic.hpp"
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#include "runtime/threadIdentifier.hpp"
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// starting at 3, excluding reserved values defined in ObjectMonitor.hpp
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static const int64_t INITIAL_TID = 3;
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static volatile int64_t next_thread_id = INITIAL_TID;
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int64_t ThreadIdentifier::initial() {
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return INITIAL_TID;
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}
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int64_t ThreadIdentifier::unsafe_offset() {
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return reinterpret_cast<int64_t>(&next_thread_id);
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}
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int64_t ThreadIdentifier::current() {
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return Atomic::load(&next_thread_id);
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}
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int64_t ThreadIdentifier::next() {
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int64_t next_tid;
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do {
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next_tid = Atomic::load(&next_thread_id);
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} while (Atomic::cmpxchg(&next_thread_id, next_tid, next_tid + 1) != next_tid);
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return next_tid;
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}
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