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src/share/vm/runtime/vmThread.hpp@eef07cd490d4 (annotated)

src/share/vm/runtime/vmThread.hpp

Wed, 03 Jul 2019 20:42:37 +0800

author

aoqi

date

Wed, 03 Jul 2019 20:42:37 +0800

changeset 9637

eef07cd490d4

parent 7535

7ae4e26cb1e0

child 9931

fd44df5e3bc3

permissions

-rw-r--r--

Merge

aoqi@0	1	/*
aoqi@0	2	* Copyright (c) 1998, 2012, 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_RUNTIME_VMTHREAD_HPP
aoqi@0	26	#define SHARE_VM_RUNTIME_VMTHREAD_HPP
aoqi@0	27
aoqi@0	28	#include "runtime/perfData.hpp"
aoqi@0	29	#include "runtime/thread.inline.hpp"
aoqi@0	30	#include "runtime/vm_operations.hpp"
aoqi@0	31
aoqi@0	32	//
aoqi@0	33	// Prioritized queue of VM operations.
aoqi@0	34	//
aoqi@0	35	// Encapsulates both queue management and
aoqi@0	36	// and priority policy
aoqi@0	37	//
aoqi@0	38	class VMOperationQueue : public CHeapObj<mtInternal> {
aoqi@0	39	private:
aoqi@0	40	enum Priorities {
aoqi@0	41	SafepointPriority, // Highest priority (operation executed at a safepoint)
aoqi@0	42	MediumPriority, // Medium priority
aoqi@0	43	nof_priorities
aoqi@0	44	};
aoqi@0	45
aoqi@0	46	// We maintain a doubled linked list, with explicit count.
aoqi@0	47	int _queue_length[nof_priorities];
aoqi@0	48	int _queue_counter;
aoqi@0	49	VM_Operation* _queue [nof_priorities];
aoqi@0	50	// we also allow the vmThread to register the ops it has drained so we
aoqi@0	51	// can scan them from oops_do
aoqi@0	52	VM_Operation* _drain_list;
aoqi@0	53
aoqi@0	54	// Double-linked non-empty list insert.
aoqi@0	55	void insert(VM_Operation* q,VM_Operation* n);
aoqi@0	56	void unlink(VM_Operation* q);
aoqi@0	57
aoqi@0	58	// Basic queue manipulation
aoqi@0	59	bool queue_empty (int prio);
aoqi@0	60	void queue_add_front (int prio, VM_Operation *op);
aoqi@0	61	void queue_add_back (int prio, VM_Operation *op);
aoqi@0	62	VM_Operation* queue_remove_front(int prio);
aoqi@0	63	void queue_oops_do(int queue, OopClosure* f);
aoqi@0	64	void drain_list_oops_do(OopClosure* f);
aoqi@0	65	VM_Operation* queue_drain(int prio);
aoqi@0	66	// lock-free query: may return the wrong answer but must not break
aoqi@0	67	bool queue_peek(int prio) { return _queue_length[prio] > 0; }
aoqi@0	68
aoqi@0	69	public:
aoqi@0	70	VMOperationQueue();
aoqi@0	71
aoqi@0	72	// Highlevel operations. Encapsulates policy
aoqi@0	73	bool add(VM_Operation *op);
aoqi@0	74	VM_Operation* remove_next(); // Returns next or null
aoqi@0	75	VM_Operation* remove_next_at_safepoint_priority() { return queue_remove_front(SafepointPriority); }
aoqi@0	76	VM_Operation* drain_at_safepoint_priority() { return queue_drain(SafepointPriority); }
aoqi@0	77	void set_drain_list(VM_Operation* list) { _drain_list = list; }
aoqi@0	78	bool peek_at_safepoint_priority() { return queue_peek(SafepointPriority); }
aoqi@0	79
aoqi@0	80	// GC support
aoqi@0	81	void oops_do(OopClosure* f);
aoqi@0	82
aoqi@0	83	void verify_queue(int prio) PRODUCT_RETURN;
aoqi@0	84	};
aoqi@0	85
aoqi@0	86
aoqi@0	87	//
aoqi@0	88	// A single VMThread (the primordial thread) spawns all other threads
aoqi@0	89	// and is itself used by other threads to offload heavy vm operations
aoqi@0	90	// like scavenge, garbage_collect etc.
aoqi@0	91	//
aoqi@0	92
aoqi@0	93	class VMThread: public NamedThread {
aoqi@0	94	private:
aoqi@0	95	static ThreadPriority _current_priority;
aoqi@0	96
aoqi@0	97	static bool _should_terminate;
aoqi@0	98	static bool _terminated;
aoqi@0	99	static Monitor * _terminate_lock;
aoqi@0	100	static PerfCounter* _perf_accumulated_vm_operation_time;
aoqi@0	101
aoqi@0	102	void evaluate_operation(VM_Operation* op);
aoqi@0	103	public:
aoqi@0	104	// Constructor
aoqi@0	105	VMThread();
aoqi@0	106
aoqi@0	107	// Tester
aoqi@0	108	bool is_VM_thread() const { return true; }
aoqi@0	109	bool is_GC_thread() const { return true; }
aoqi@0	110
aoqi@0	111	// The ever running loop for the VMThread
aoqi@0	112	void loop();
aoqi@0	113
aoqi@0	114	// Called to stop the VM thread
aoqi@0	115	static void wait_for_vm_thread_exit();
aoqi@0	116	static bool should_terminate() { return _should_terminate; }
aoqi@0	117	static bool is_terminated() { return _terminated == true; }
aoqi@0	118
aoqi@0	119	// Execution of vm operation
aoqi@0	120	static void execute(VM_Operation* op);
aoqi@0	121
aoqi@0	122	// Returns the current vm operation if any.
aoqi@0	123	static VM_Operation* vm_operation() { return _cur_vm_operation; }
aoqi@0	124
aoqi@0	125	// Returns the single instance of VMThread.
aoqi@0	126	static VMThread* vm_thread() { return _vm_thread; }
aoqi@0	127
aoqi@0	128	// GC support
stefank@6973	129	void oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf);
aoqi@0	130
aoqi@0	131	// Debugging
aoqi@0	132	void print_on(outputStream* st) const;
aoqi@0	133	void print() const { print_on(tty); }
aoqi@0	134	void verify();
aoqi@0	135
aoqi@0	136	// Performance measurement
aoqi@0	137	static PerfCounter* perf_accumulated_vm_operation_time() { return _perf_accumulated_vm_operation_time; }
aoqi@0	138
aoqi@0	139	// Entry for starting vm thread
aoqi@0	140	virtual void run();
aoqi@0	141
aoqi@0	142	// Creations/Destructions
aoqi@0	143	static void create();
aoqi@0	144	static void destroy();
aoqi@0	145
aoqi@0	146	private:
aoqi@0	147	// VM_Operation support
aoqi@0	148	static VM_Operation* _cur_vm_operation; // Current VM operation
aoqi@0	149	static VMOperationQueue* _vm_queue; // Queue (w/ policy) of VM operations
aoqi@0	150
aoqi@0	151	// Pointer to single-instance of VM thread
aoqi@0	152	static VMThread* _vm_thread;
aoqi@0	153	};
aoqi@0	154
aoqi@0	155	#endif // SHARE_VM_RUNTIME_VMTHREAD_HPP