src/hotspot/share/gc/shared/strongRootsScope.cpp
author kbarrett
Tue, 02 Apr 2019 13:08:38 -0400
changeset 54385 9559ba212c18
parent 50445 bd6b78feb6a3
permissions -rw-r--r--
8221102: Allow GC threads to participate in threads claiming protocol Summary: Expand claim counter from 1bit to uintx, with rare overflow handling. Reviewed-by: tschatzl, rkennke

/*
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * 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).
 *
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 * 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 "classfile/stringTable.hpp"
#include "code/nmethod.hpp"
#include "gc/shared/strongRootsScope.hpp"
#include "runtime/thread.hpp"

MarkScope::MarkScope() {
  nmethod::oops_do_marking_prologue();
}

MarkScope::~MarkScope() {
  nmethod::oops_do_marking_epilogue();
}

StrongRootsScope::StrongRootsScope(uint n_threads) : _n_threads(n_threads) {
  Threads::change_thread_claim_token();
}

StrongRootsScope::~StrongRootsScope() {
  Threads::assert_all_threads_claimed();
}