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/*
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* Copyright (c) 2017, 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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#ifndef SHARE_VM_RUNTIME_SAFEPOINTMECHANISM_INLINE_HPP
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#define SHARE_VM_RUNTIME_SAFEPOINTMECHANISM_INLINE_HPP
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#include "runtime/safepointMechanism.hpp"
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#include "runtime/safepoint.hpp"
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#include "runtime/thread.inline.hpp"
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bool SafepointMechanism::local_poll_armed(JavaThread* thread) {
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const intptr_t poll_word = reinterpret_cast<intptr_t>(thread->get_polling_page());
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return mask_bits_are_true(poll_word, poll_bit());
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}
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bool SafepointMechanism::global_poll() {
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return SafepointSynchronize::do_call_back();
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}
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bool SafepointMechanism::local_poll(Thread* thread) {
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if (thread->is_Java_thread()) {
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return local_poll_armed((JavaThread*)thread);
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} else {
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// If the poll is on a non-java thread we can only check the global state.
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return global_poll();
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}
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}
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bool SafepointMechanism::poll(Thread* thread) {
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if (uses_thread_local_poll()) {
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return local_poll(thread);
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} else {
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return global_poll();
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}
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}
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void SafepointMechanism::block_if_requested_local_poll(JavaThread *thread) {
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bool armed = local_poll_armed(thread); // load acquire, polling page -> op / global state
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if(armed) {
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// We could be armed for either a handshake operation or a safepoint
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if (thread->has_handshake()) {
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thread->handshake_process_by_self();
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} else {
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if (global_poll()) {
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SafepointSynchronize::block(thread);
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}
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}
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}
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}
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void SafepointMechanism::block_if_requested(JavaThread *thread) {
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if (uses_thread_local_poll()) {
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block_if_requested_local_poll(thread);
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} else {
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// If we don't have per thread poll this could a handshake or a safepoint
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if (global_poll()) {
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SafepointSynchronize::block(thread);
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}
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}
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}
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void SafepointMechanism::arm_local_poll(JavaThread* thread) {
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thread->set_polling_page(poll_armed_value());
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}
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void SafepointMechanism::disarm_local_poll(JavaThread* thread) {
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thread->set_polling_page(poll_disarmed_value());
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}
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#endif // SHARE_VM_RUNTIME_SAFEPOINTMECHANISM_INLINE_HPP
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