src/hotspot/share/gc/shared/strongRootsScope.cpp

/*
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * under the terms of the GNU General Public License version 2 only, as
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 *
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 * 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 "classfile/stringTable.hpp"
#include "code/nmethod.hpp"
#include "gc/shared/strongRootsScope.hpp"
#include "runtime/threads.hpp"

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

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

StrongRootsScope::StrongRootsScope(uint n_threads) : _n_threads(n_threads) {
  // No need for thread claim for statically-known sequential case (_n_threads == 0)
  // For positive values, clients of this class often unify sequential/parallel
  // cases, so they expect the thread claim token to be updated.
  if (_n_threads != 0) {
    Threads::change_thread_claim_token();
  }
}

StrongRootsScope::~StrongRootsScope() {
  if (_n_threads != 0) {
    Threads::assert_all_threads_claimed();
  }
}