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47 lines
1.9 KiB
C++
47 lines
1.9 KiB
C++
/*
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* Copyright Amazon.com Inc. 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 "oops/symbolHandle.hpp"
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#include "runtime/atomicAccess.hpp"
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Symbol* volatile TempSymbolCleanupDelayer::_queue[QueueSize] = {};
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volatile uint TempSymbolCleanupDelayer::_index = 0;
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// Keep this symbol alive for some time to allow for reuse.
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// Temp symbols for the same string can often be created in quick succession,
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// and this queue allows them to be reused instead of churning.
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void TempSymbolCleanupDelayer::delay_cleanup(Symbol* sym) {
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assert(sym != nullptr, "precondition");
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sym->increment_refcount();
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uint i = AtomicAccess::add(&_index, 1u) % QueueSize;
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Symbol* old = AtomicAccess::xchg(&_queue[i], sym);
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Symbol::maybe_decrement_refcount(old);
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}
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void TempSymbolCleanupDelayer::drain_queue() {
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for (uint i = 0; i < QueueSize; i++) {
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Symbol* sym = AtomicAccess::xchg(&_queue[i], (Symbol*) nullptr);
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Symbol::maybe_decrement_refcount(sym);
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}
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}
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