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corretto-11/src/src/hotspot/share/runtime/handshake.hpp
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/* | |
* Copyright (c) 2017, 2018, Oracle and/or its affiliates. All rights reserved. | |
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | |
* | |
* This code is free software; you can redistribute it and/or modify it | |
* under the terms of the GNU General Public License version 2 only, as | |
* 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). | |
* | |
* You should have received a copy of the GNU General Public License version | |
* 2 along with this work; if not, write to the Free Software Foundation, | |
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
* | |
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
* or visit www.oracle.com if you need additional information or have any | |
* questions. | |
* | |
*/ | |
#ifndef SHARE_VM_RUNTIME_HANDSHAKE_HPP | |
#define SHARE_VM_RUNTIME_HANDSHAKE_HPP | |
#include "memory/allocation.hpp" | |
#include "runtime/flags/flagSetting.hpp" | |
#include "runtime/semaphore.hpp" | |
class ThreadClosure; | |
class JavaThread; | |
// A handshake operation is a callback that is executed for each JavaThread | |
// while that thread is in a safepoint safe state. The callback is executed | |
// either by the thread itself or by the VM thread while keeping the thread | |
// in a blocked state. A handshake can be performed with a single | |
// JavaThread as well. | |
class Handshake : public AllStatic { | |
public: | |
// Execution of handshake operation | |
static void execute(ThreadClosure* thread_cl); | |
static bool execute(ThreadClosure* thread_cl, JavaThread* target); | |
}; | |
class HandshakeOperation; | |
// The HandshakeState keep tracks of an ongoing handshake for one JavaThread. | |
// VM thread and JavaThread are serialized with the semaphore making sure | |
// the operation is only done by either VM thread on behalf of the JavaThread | |
// or the JavaThread itself. | |
class HandshakeState { | |
HandshakeOperation* volatile _operation; | |
Semaphore _semaphore; | |
bool _thread_in_process_handshake; | |
bool claim_handshake_for_vmthread(); | |
bool vmthread_can_process_handshake(JavaThread* target); | |
void clear_handshake(JavaThread* thread); | |
void cancel_inner(JavaThread* thread); | |
void process_self_inner(JavaThread* thread); | |
public: | |
HandshakeState(); | |
void set_operation(JavaThread* thread, HandshakeOperation* op); | |
bool has_operation() const { | |
return _operation != NULL; | |
} | |
void cancel(JavaThread* thread) { | |
if (!_thread_in_process_handshake) { | |
FlagSetting fs(_thread_in_process_handshake, true); | |
cancel_inner(thread); | |
} | |
} | |
void process_by_self(JavaThread* thread) { | |
if (!_thread_in_process_handshake) { | |
FlagSetting fs(_thread_in_process_handshake, true); | |
process_self_inner(thread); | |
} | |
} | |
void process_by_vmthread(JavaThread* target); | |
}; | |
#endif // SHARE_VM_RUNTIME_HANDSHAKE_HPP |