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src/share/vm/gc_implementation/shared/concurrentGCThread.hpp@f90c822e73f8 (annotated)

src/share/vm/gc_implementation/shared/concurrentGCThread.hpp

Wed, 27 Apr 2016 01:25:04 +0800

author

aoqi

date

Wed, 27 Apr 2016 01:25:04 +0800

changeset 0

f90c822e73f8

child 6876

710a3c8b516e

permissions

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http://hg.openjdk.java.net/jdk8u/jdk8u/hotspot/
changeset: 6782:28b50d07f6f8
tag: jdk8u25-b17

aoqi@0	1	/*
aoqi@0	2	* Copyright (c) 2001, 2013, Oracle and/or its affiliates. All rights reserved.
aoqi@0	3	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@0	4	*
aoqi@0	5	* This code is free software; you can redistribute it and/or modify it
aoqi@0	6	* under the terms of the GNU General Public License version 2 only, as
aoqi@0	7	* published by the Free Software Foundation.
aoqi@0	8	*
aoqi@0	9	* This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
aoqi@0	12	* version 2 for more details (a copy is included in the LICENSE file that
aoqi@0	13	* accompanied this code).
aoqi@0	14	*
aoqi@0	15	* You should have received a copy of the GNU General Public License version
aoqi@0	16	* 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0	17	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0	18	*
aoqi@0	19	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0	20	* or visit www.oracle.com if you need additional information or have any
aoqi@0	21	* questions.
aoqi@0	22	*
aoqi@0	23	*/
aoqi@0	24
aoqi@0	25	#ifndef SHARE_VM_GC_IMPLEMENTATION_SHARED_CONCURRENTGCTHREAD_HPP
aoqi@0	26	#define SHARE_VM_GC_IMPLEMENTATION_SHARED_CONCURRENTGCTHREAD_HPP
aoqi@0	27
aoqi@0	28	#include "utilities/macros.hpp"
aoqi@0	29	#if INCLUDE_ALL_GCS
aoqi@0	30	#include "runtime/thread.hpp"
aoqi@0	31	#endif // INCLUDE_ALL_GCS
aoqi@0	32
aoqi@0	33	class VoidClosure;
aoqi@0	34
aoqi@0	35	// A SuspendibleThreadSet is (obviously) a set of threads that can be
aoqi@0	36	// suspended. A thread can join and later leave the set, and periodically
aoqi@0	37	// yield. If some thread (not in the set) requests, via suspend_all, that
aoqi@0	38	// the threads be suspended, then the requesting thread is blocked until
aoqi@0	39	// all the threads in the set have yielded or left the set. (Threads may
aoqi@0	40	// not enter the set when an attempted suspension is in progress.) The
aoqi@0	41	// suspending thread later calls resume_all, allowing the suspended threads
aoqi@0	42	// to continue.
aoqi@0	43
aoqi@0	44	class SuspendibleThreadSet {
aoqi@0	45	Monitor* _m;
aoqi@0	46	int _async;
aoqi@0	47	bool _async_stop;
aoqi@0	48	int _async_stopped;
aoqi@0	49	bool _initialized;
aoqi@0	50	double _suspend_all_start;
aoqi@0	51
aoqi@0	52	void initialize_work();
aoqi@0	53
aoqi@0	54	public:
aoqi@0	55	SuspendibleThreadSet() : _initialized(false) {}
aoqi@0	56
aoqi@0	57	// Add the current thread to the set. May block if a suspension
aoqi@0	58	// is in progress.
aoqi@0	59	void join();
aoqi@0	60	// Removes the current thread from the set.
aoqi@0	61	void leave();
aoqi@0	62	// Returns "true" iff an suspension is in progress.
aoqi@0	63	bool should_yield() { return _async_stop; }
aoqi@0	64	// Suspends the current thread if a suspension is in progress (for
aoqi@0	65	// the duration of the suspension.)
aoqi@0	66	void yield(const char* id);
aoqi@0	67	// Return when all threads in the set are suspended.
aoqi@0	68	void suspend_all();
aoqi@0	69	// Allow suspended threads to resume.
aoqi@0	70	void resume_all();
aoqi@0	71	// Redundant initializations okay.
aoqi@0	72	void initialize() {
aoqi@0	73	// Double-check dirty read idiom.
aoqi@0	74	if (!_initialized) initialize_work();
aoqi@0	75	}
aoqi@0	76	};
aoqi@0	77
aoqi@0	78
aoqi@0	79	class ConcurrentGCThread: public NamedThread {
aoqi@0	80	friend class VMStructs;
aoqi@0	81
aoqi@0	82	protected:
aoqi@0	83	bool _should_terminate;
aoqi@0	84	bool _has_terminated;
aoqi@0	85
aoqi@0	86	enum CGC_flag_type {
aoqi@0	87	CGC_nil = 0x0,
aoqi@0	88	CGC_dont_suspend = 0x1,
aoqi@0	89	CGC_CGC_safepoint = 0x2,
aoqi@0	90	CGC_VM_safepoint = 0x4
aoqi@0	91	};
aoqi@0	92
aoqi@0	93	static int _CGC_flag;
aoqi@0	94
aoqi@0	95	static bool CGC_flag_is_set(int b) { return (_CGC_flag & b) != 0; }
aoqi@0	96	static int set_CGC_flag(int b) { return _CGC_flag |= b; }
aoqi@0	97	static int reset_CGC_flag(int b) { return _CGC_flag &= ~b; }
aoqi@0	98
aoqi@0	99	// All instances share this one set.
aoqi@0	100	static SuspendibleThreadSet _sts;
aoqi@0	101
aoqi@0	102	// Create and start the thread (setting it's priority high.)
aoqi@0	103	void create_and_start();
aoqi@0	104
aoqi@0	105	// Do initialization steps in the thread: record stack base and size,
aoqi@0	106	// init thread local storage, set JNI handle block.
aoqi@0	107	void initialize_in_thread();
aoqi@0	108
aoqi@0	109	// Wait until Universe::is_fully_initialized();
aoqi@0	110	void wait_for_universe_init();
aoqi@0	111
aoqi@0	112	// Record that the current thread is terminating, and will do more
aoqi@0	113	// concurrent work.
aoqi@0	114	void terminate();
aoqi@0	115
aoqi@0	116	public:
aoqi@0	117	// Constructor
aoqi@0	118
aoqi@0	119	ConcurrentGCThread();
aoqi@0	120	~ConcurrentGCThread() {} // Exists to call NamedThread destructor.
aoqi@0	121
aoqi@0	122	// Tester
aoqi@0	123	bool is_ConcurrentGC_thread() const { return true; }
aoqi@0	124
aoqi@0	125	static void safepoint_synchronize();
aoqi@0	126	static void safepoint_desynchronize();
aoqi@0	127
aoqi@0	128	// All overridings should probably do _sts::yield, but we allow
aoqi@0	129	// overriding for distinguished debugging messages. Default is to do
aoqi@0	130	// nothing.
aoqi@0	131	virtual void yield() {}
aoqi@0	132
aoqi@0	133	bool should_yield() { return _sts.should_yield(); }
aoqi@0	134
aoqi@0	135	// they are prefixed by sts since there are already yield() and
aoqi@0	136	// should_yield() (non-static) methods in this class and it was an
aoqi@0	137	// easy way to differentiate them.
aoqi@0	138	static void stsYield(const char* id);
aoqi@0	139	static bool stsShouldYield();
aoqi@0	140	static void stsJoin();
aoqi@0	141	static void stsLeave();
aoqi@0	142
aoqi@0	143	};
aoqi@0	144
aoqi@0	145	// The SurrogateLockerThread is used by concurrent GC threads for
aoqi@0	146	// manipulating Java monitors, in particular, currently for
aoqi@0	147	// manipulating the pending_list_lock. XXX
aoqi@0	148	class SurrogateLockerThread: public JavaThread {
aoqi@0	149	friend class VMStructs;
aoqi@0	150	public:
aoqi@0	151	enum SLT_msg_type {
aoqi@0	152	empty = 0, // no message
aoqi@0	153	acquirePLL, // acquire pending list lock
aoqi@0	154	releaseAndNotifyPLL // notify and release pending list lock
aoqi@0	155	};
aoqi@0	156	private:
aoqi@0	157	// the following are shared with the CMSThread
aoqi@0	158	SLT_msg_type _buffer; // communication buffer
aoqi@0	159	Monitor _monitor; // monitor controlling buffer
aoqi@0	160	BasicLock _basicLock; // used for PLL locking
aoqi@0	161
aoqi@0	162	public:
aoqi@0	163	static SurrogateLockerThread* make(TRAPS);
aoqi@0	164
aoqi@0	165	SurrogateLockerThread();
aoqi@0	166
aoqi@0	167	bool is_hidden_from_external_view() const { return true; }
aoqi@0	168
aoqi@0	169	void loop(); // main method
aoqi@0	170
aoqi@0	171	void manipulatePLL(SLT_msg_type msg);
aoqi@0	172
aoqi@0	173	};
aoqi@0	174
aoqi@0	175	#endif // SHARE_VM_GC_IMPLEMENTATION_SHARED_CONCURRENTGCTHREAD_HPP