152 lines
4.6 KiB
C++
152 lines
4.6 KiB
C++
/*
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* Copyright (c) 1999, 2019, 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_PRIMS_JVMTIRAWMONITOR_HPP
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#define SHARE_PRIMS_JVMTIRAWMONITOR_HPP
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#include "memory/allocation.hpp"
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#include "runtime/park.hpp"
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#include "utilities/growableArray.hpp"
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//
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// class JvmtiRawMonitor
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//
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// Used by JVMTI methods: All RawMonitor methods (CreateRawMonitor, EnterRawMonitor, etc.)
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//
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// A simplified version of the ObjectMonitor code.
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//
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class JvmtiRawMonitor : public CHeapObj<mtSynchronizer> {
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// Helper class to allow Threads to be linked into queues.
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// This is a stripped down version of ObjectWaiter.
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class QNode : public StackObj {
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friend class JvmtiRawMonitor;
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enum TStates { TS_READY, TS_RUN, TS_WAIT, TS_ENTER };
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QNode* volatile _next;
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QNode* volatile _prev;
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ParkEvent* _event;
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volatile int _notified;
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volatile TStates _t_state;
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QNode(Thread* thread);
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};
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Thread* volatile _owner; // pointer to owning thread
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volatile int _recursions; // recursion count, 0 for first entry
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QNode* volatile _entry_list; // Threads blocked on entry or reentry.
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// The list is actually composed of nodes,
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// acting as proxies for Threads.
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QNode* volatile _wait_set; // Threads wait()ing on the monitor
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volatile jint _waiters; // number of waiting threads
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int _magic;
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char* _name;
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// JVMTI_RM_MAGIC is set in contructor and unset in destructor.
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enum { JVMTI_RM_MAGIC = (int)(('T' << 24) | ('I' << 16) | ('R' << 8) | 'M') };
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// Helpers for queue management isolation
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void enqueue_waiter(QNode& node);
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void dequeue_waiter(QNode& node);
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// Mostly low-level implementation routines
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void simple_enter(Thread* self);
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void simple_exit(Thread* self);
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int simple_wait(Thread* self, jlong millis);
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void simple_notify(Thread* self, bool all);
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public:
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// return codes
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enum {
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M_OK, // no error
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M_ILLEGAL_MONITOR_STATE, // IllegalMonitorStateException
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M_INTERRUPTED // Thread.interrupt()
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};
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// Non-aborting operator new
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void* operator new(size_t size) throw() {
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return CHeapObj::operator new(size, std::nothrow);
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}
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JvmtiRawMonitor(const char* name);
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~JvmtiRawMonitor();
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Thread* owner() const { return _owner; }
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void set_owner(Thread* owner) { _owner = owner; }
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int recursions() const { return _recursions; }
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void raw_enter(Thread* self);
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int raw_exit(Thread* self);
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int raw_wait(jlong millis, Thread* self);
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int raw_notify(Thread* self);
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int raw_notifyAll(Thread* self);
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int magic() const { return _magic; }
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const char* get_name() const { return _name; }
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bool is_valid();
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};
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// Onload pending raw monitors
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// Class is used to cache onload or onstart monitor enter
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// which will transition into real monitor when
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// VM is fully initialized.
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class JvmtiPendingMonitors : public AllStatic {
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private:
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static GrowableArray<JvmtiRawMonitor*>* _monitors; // Cache raw monitor enter
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inline static GrowableArray<JvmtiRawMonitor*>* monitors() { return _monitors; }
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static void dispose() {
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delete monitors();
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}
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public:
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static void enter(JvmtiRawMonitor* monitor) {
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monitors()->append(monitor);
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}
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static int count() {
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return monitors()->length();
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}
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static void destroy(JvmtiRawMonitor* monitor) {
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while (monitors()->contains(monitor)) {
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monitors()->remove(monitor);
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}
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}
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// Return false if monitor is not found in the list.
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static bool exit(JvmtiRawMonitor* monitor) {
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if (monitors()->contains(monitor)) {
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monitors()->remove(monitor);
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return true;
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} else {
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return false;
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}
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}
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static void transition_raw_monitors();
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};
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#endif // SHARE_PRIMS_JVMTIRAWMONITOR_HPP
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