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src/share/vm/runtime/synchronizer.hpp@7e72702243a4 (annotated)

src/share/vm/runtime/synchronizer.hpp

Tue, 16 Oct 2018 10:40:23 -0400

author

phh

date

Tue, 16 Oct 2018 10:40:23 -0400

changeset 9507

7e72702243a4

parent 8729

402618d5afc9

child 9572

624a0741915c

child 9838

ff1c3c1867b5

permissions

-rw-r--r--

8064811: Use THEAD instead of CHECK_NULL in return statements
Summary: Backport from JDK9
Reviewed-by: dholmes, coffeys

duke@435	1	/*
phh@9507	2	* Copyright (c) 1998, 2018, Oracle and/or its affiliates. All rights reserved.
duke@435	3	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@435	4	*
duke@435	5	* This code is free software; you can redistribute it and/or modify it
duke@435	6	* under the terms of the GNU General Public License version 2 only, as
duke@435	7	* published by the Free Software Foundation.
duke@435	8	*
duke@435	9	* This code is distributed in the hope that it will be useful, but WITHOUT
duke@435	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@435	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
duke@435	12	* version 2 for more details (a copy is included in the LICENSE file that
duke@435	13	* accompanied this code).
duke@435	14	*
duke@435	15	* You should have received a copy of the GNU General Public License version
duke@435	16	* 2 along with this work; if not, write to the Free Software Foundation,
duke@435	17	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@435	18	*
trims@1907	19	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
trims@1907	20	* or visit www.oracle.com if you need additional information or have any
trims@1907	21	* questions.
duke@435	22	*
duke@435	23	*/
duke@435	24
stefank@2314	25	#ifndef SHARE_VM_RUNTIME_SYNCHRONIZER_HPP
stefank@2314	26	#define SHARE_VM_RUNTIME_SYNCHRONIZER_HPP
stefank@2314	27
stefank@2314	28	#include "oops/markOop.hpp"
stefank@2314	29	#include "runtime/basicLock.hpp"
stefank@2314	30	#include "runtime/handles.hpp"
stefank@2314	31	#include "runtime/perfData.hpp"
stefank@2314	32	#include "utilities/top.hpp"
stefank@2314	33
duke@435	34
duke@435	35	class ObjectMonitor;
duke@435	36
duke@435	37	class ObjectSynchronizer : AllStatic {
duke@435	38	friend class VMStructs;
duke@435	39	public:
duke@435	40	typedef enum {
duke@435	41	owner_self,
duke@435	42	owner_none,
duke@435	43	owner_other
duke@435	44	} LockOwnership;
duke@435	45	// exit must be implemented non-blocking, since the compiler cannot easily handle
duke@435	46	// deoptimization at monitor exit. Hence, it does not take a Handle argument.
duke@435	47
duke@435	48	// This is full version of monitor enter and exit. I choose not
duke@435	49	// to use enter() and exit() in order to make sure user be ware
duke@435	50	// of the performance and semantics difference. They are normally
duke@435	51	// used by ObjectLocker etc. The interpreter and compiler use
duke@435	52	// assembly copies of these routines. Please keep them synchornized.
duke@435	53	//
duke@435	54	// attempt_rebias flag is used by UseBiasedLocking implementation
duke@435	55	static void fast_enter (Handle obj, BasicLock* lock, bool attempt_rebias, TRAPS);
duke@435	56	static void fast_exit (oop obj, BasicLock* lock, Thread* THREAD);
duke@435	57
duke@435	58	// WARNING: They are ONLY used to handle the slow cases. They should
duke@435	59	// only be used when the fast cases failed. Use of these functions
duke@435	60	// without previous fast case check may cause fatal error.
duke@435	61	static void slow_enter (Handle obj, BasicLock* lock, TRAPS);
duke@435	62	static void slow_exit (oop obj, BasicLock* lock, Thread* THREAD);
duke@435	63
duke@435	64	// Used only to handle jni locks or other unmatched monitor enter/exit
duke@435	65	// Internally they will use heavy weight monitor.
duke@435	66	static void jni_enter (Handle obj, TRAPS);
duke@435	67	static bool jni_try_enter(Handle obj, Thread* THREAD); // Implements Unsafe.tryMonitorEnter
duke@435	68	static void jni_exit (oop obj, Thread* THREAD);
duke@435	69
duke@435	70	// Handle all interpreter, compiler and jni cases
duke@435	71	static void wait (Handle obj, jlong millis, TRAPS);
duke@435	72	static void notify (Handle obj, TRAPS);
duke@435	73	static void notifyall (Handle obj, TRAPS);
duke@435	74
duke@435	75	// Special internal-use-only method for use by JVM infrastructure
duke@435	76	// that needs to wait() on a java-level object but that can't risk
duke@435	77	// throwing unexpected InterruptedExecutionExceptions.
duke@435	78	static void waitUninterruptibly (Handle obj, jlong Millis, Thread * THREAD) ;
duke@435	79
duke@435	80	// used by classloading to free classloader object lock,
duke@435	81	// wait on an internal lock, and reclaim original lock
duke@435	82	// with original recursion count
duke@435	83	static intptr_t complete_exit (Handle obj, TRAPS);
duke@435	84	static void reenter (Handle obj, intptr_t recursion, TRAPS);
duke@435	85
duke@435	86	// thread-specific and global objectMonitor free list accessors
acorn@1995	87	// static void verifyInUse (Thread * Self) ; too slow for general assert/debug
duke@435	88	static ObjectMonitor * omAlloc (Thread * Self) ;
acorn@1995	89	static void omRelease (Thread * Self, ObjectMonitor * m, bool FromPerThreadAlloc) ;
duke@435	90	static void omFlush (Thread * Self) ;
duke@435	91
duke@435	92	// Inflate light weight monitor to heavy weight monitor
duke@435	93	static ObjectMonitor* inflate(Thread * Self, oop obj);
duke@435	94	// This version is only for internal use
duke@435	95	static ObjectMonitor* inflate_helper(oop obj);
duke@435	96
duke@435	97	// Returns the identity hash value for an oop
duke@435	98	// NOTE: It may cause monitor inflation
duke@435	99	static intptr_t identity_hash_value_for(Handle obj);
duke@435	100	static intptr_t FastHashCode (Thread * Self, oop obj) ;
duke@435	101
duke@435	102	// java.lang.Thread support
duke@435	103	static bool current_thread_holds_lock(JavaThread* thread, Handle h_obj);
duke@435	104	static LockOwnership query_lock_ownership(JavaThread * self, Handle h_obj);
duke@435	105
duke@435	106	static JavaThread* get_lock_owner(Handle h_obj, bool doLock);
duke@435	107
duke@435	108	// JNI detach support
duke@435	109	static void release_monitors_owned_by_thread(TRAPS);
duke@435	110	static void monitors_iterate(MonitorClosure* m);
duke@435	111
duke@435	112	// GC: we current use aggressive monitor deflation policy
duke@435	113	// Basically we deflate all monitors that are not busy.
duke@435	114	// An adaptive profile-based deflation policy could be used if needed
duke@435	115	static void deflate_idle_monitors();
acorn@1995	116	static int walk_monitor_list(ObjectMonitor** listheadp,
acorn@1995	117	ObjectMonitor** FreeHeadp,
acorn@1995	118	ObjectMonitor** FreeTailp);
acorn@1942	119	static bool deflate_monitor(ObjectMonitor* mid, oop obj, ObjectMonitor** FreeHeadp,
acorn@1942	120	ObjectMonitor** FreeTailp);
duke@435	121	static void oops_do(OopClosure* f);
duke@435	122
duke@435	123	// debugging
kevinw@8729	124	static void sanity_checks(const bool verbose,
kevinw@8729	125	const unsigned int cache_line_size,
kevinw@8729	126	int *error_cnt_ptr, int *warning_cnt_ptr);
duke@435	127	static void verify() PRODUCT_RETURN;
duke@435	128	static int verify_objmon_isinpool(ObjectMonitor *addr) PRODUCT_RETURN0;
duke@435	129
acorn@2233	130	static void RegisterSpinCallback (int (*)(intptr_t, int), intptr_t) ;
acorn@2233	131
duke@435	132	private:
duke@435	133	enum { _BLOCKSIZE = 128 };
duke@435	134	static ObjectMonitor* gBlockList;
duke@435	135	static ObjectMonitor * volatile gFreeList;
acorn@1995	136	static ObjectMonitor * volatile gOmInUseList; // for moribund thread, so monitors they inflated still get scanned
acorn@1995	137	static int gOmInUseCount;
duke@435	138
duke@435	139	};
duke@435	140
duke@435	141	// ObjectLocker enforced balanced locking and can never thrown an
duke@435	142	// IllegalMonitorStateException. However, a pending exception may
duke@435	143	// have to pass through, and we must also be able to deal with
duke@435	144	// asynchronous exceptions. The caller is responsible for checking
duke@435	145	// the threads pending exception if needed.
duke@435	146	// doLock was added to support classloading with UnsyncloadClass which
duke@435	147	// requires flag based choice of locking the classloader lock.
duke@435	148	class ObjectLocker : public StackObj {
duke@435	149	private:
duke@435	150	Thread* _thread;
duke@435	151	Handle _obj;
duke@435	152	BasicLock _lock;
duke@435	153	bool _dolock; // default true
duke@435	154	public:
duke@435	155	ObjectLocker(Handle obj, Thread* thread, bool doLock = true);
duke@435	156	~ObjectLocker();
duke@435	157
duke@435	158	// Monitor behavior
duke@435	159	void wait (TRAPS) { ObjectSynchronizer::wait (_obj, 0, CHECK); } // wait forever
duke@435	160	void notify_all(TRAPS) { ObjectSynchronizer::notifyall(_obj, CHECK); }
duke@435	161	void waitUninterruptibly (TRAPS) { ObjectSynchronizer::waitUninterruptibly (_obj, 0, CHECK);}
duke@435	162	// complete_exit gives up lock completely, returning recursion count
duke@435	163	// reenter reclaims lock with original recursion count
phh@9507	164	intptr_t complete_exit(TRAPS) { return ObjectSynchronizer::complete_exit(_obj, THREAD); }
duke@435	165	void reenter(intptr_t recursion, TRAPS) { ObjectSynchronizer::reenter(_obj, recursion, CHECK); }
duke@435	166	};
stefank@2314	167
stefank@2314	168	#endif // SHARE_VM_RUNTIME_SYNCHRONIZER_HPP