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8187443: Forest Consolidation: Move files to unified layout
Reviewed-by: darcy, ihse
This commit is contained in:
Erik Joelsson
parent
270fe13182
commit
3789983e89
56923 changed files with 3 additions and 15727 deletions
209
src/hotspot/share/runtime/synchronizer.hpp
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src/hotspot/share/runtime/synchronizer.hpp
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/*
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* Copyright (c) 1998, 2017, 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_VM_RUNTIME_SYNCHRONIZER_HPP
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#define SHARE_VM_RUNTIME_SYNCHRONIZER_HPP
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#include "oops/markOop.hpp"
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#include "runtime/basicLock.hpp"
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#include "runtime/handles.hpp"
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#include "runtime/perfData.hpp"
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class ObjectMonitor;
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struct DeflateMonitorCounters {
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int nInuse; // currently associated with objects
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int nInCirculation; // extant
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int nScavenged; // reclaimed
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};
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class ObjectSynchronizer : AllStatic {
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friend class VMStructs;
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public:
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typedef enum {
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owner_self,
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owner_none,
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owner_other
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} LockOwnership;
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typedef enum {
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inflate_cause_vm_internal = 0,
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inflate_cause_monitor_enter = 1,
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inflate_cause_wait = 2,
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inflate_cause_notify = 3,
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inflate_cause_hash_code = 4,
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inflate_cause_jni_enter = 5,
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inflate_cause_jni_exit = 6,
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inflate_cause_nof = 7 // Number of causes
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} InflateCause;
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// exit must be implemented non-blocking, since the compiler cannot easily handle
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// deoptimization at monitor exit. Hence, it does not take a Handle argument.
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// This is full version of monitor enter and exit. I choose not
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// to use enter() and exit() in order to make sure user be ware
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// of the performance and semantics difference. They are normally
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// used by ObjectLocker etc. The interpreter and compiler use
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// assembly copies of these routines. Please keep them synchronized.
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//
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// attempt_rebias flag is used by UseBiasedLocking implementation
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static void fast_enter(Handle obj, BasicLock* lock, bool attempt_rebias,
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TRAPS);
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static void fast_exit(oop obj, BasicLock* lock, Thread* THREAD);
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// WARNING: They are ONLY used to handle the slow cases. They should
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// only be used when the fast cases failed. Use of these functions
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// without previous fast case check may cause fatal error.
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static void slow_enter(Handle obj, BasicLock* lock, TRAPS);
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static void slow_exit(oop obj, BasicLock* lock, Thread* THREAD);
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// Used only to handle jni locks or other unmatched monitor enter/exit
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// Internally they will use heavy weight monitor.
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static void jni_enter(Handle obj, TRAPS);
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static void jni_exit(oop obj, Thread* THREAD);
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// Handle all interpreter, compiler and jni cases
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static int wait(Handle obj, jlong millis, TRAPS);
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static void notify(Handle obj, TRAPS);
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static void notifyall(Handle obj, TRAPS);
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static bool quick_notify(oopDesc* obj, Thread* Self, bool All);
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static bool quick_enter(oop obj, Thread* Self, BasicLock* Lock);
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// Special internal-use-only method for use by JVM infrastructure
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// that needs to wait() on a java-level object but that can't risk
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// throwing unexpected InterruptedExecutionExceptions.
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static void waitUninterruptibly(Handle obj, jlong Millis, Thread * THREAD);
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// used by classloading to free classloader object lock,
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// wait on an internal lock, and reclaim original lock
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// with original recursion count
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static intptr_t complete_exit(Handle obj, TRAPS);
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static void reenter (Handle obj, intptr_t recursion, TRAPS);
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// thread-specific and global objectMonitor free list accessors
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static void verifyInUse(Thread * Self);
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static ObjectMonitor * omAlloc(Thread * Self);
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static void omRelease(Thread * Self, ObjectMonitor * m,
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bool FromPerThreadAlloc);
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static void omFlush(Thread * Self);
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// Inflate light weight monitor to heavy weight monitor
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static ObjectMonitor* inflate(Thread * Self, oop obj, const InflateCause cause);
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// This version is only for internal use
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static ObjectMonitor* inflate_helper(oop obj);
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static const char* inflate_cause_name(const InflateCause cause);
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// Returns the identity hash value for an oop
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// NOTE: It may cause monitor inflation
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static intptr_t identity_hash_value_for(Handle obj);
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static intptr_t FastHashCode(Thread * Self, oop obj);
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// java.lang.Thread support
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static bool current_thread_holds_lock(JavaThread* thread, Handle h_obj);
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static LockOwnership query_lock_ownership(JavaThread * self, Handle h_obj);
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static JavaThread* get_lock_owner(Handle h_obj, bool doLock);
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// JNI detach support
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static void release_monitors_owned_by_thread(TRAPS);
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static void monitors_iterate(MonitorClosure* m);
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// GC: we current use aggressive monitor deflation policy
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// Basically we deflate all monitors that are not busy.
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// An adaptive profile-based deflation policy could be used if needed
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static void deflate_idle_monitors(DeflateMonitorCounters* counters);
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static void deflate_thread_local_monitors(Thread* thread, DeflateMonitorCounters* counters);
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static void prepare_deflate_idle_monitors(DeflateMonitorCounters* counters);
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static void finish_deflate_idle_monitors(DeflateMonitorCounters* counters);
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// For a given monitor list: global or per-thread, deflate idle monitors
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static int deflate_monitor_list(ObjectMonitor** listheadp,
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ObjectMonitor** freeHeadp,
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ObjectMonitor** freeTailp);
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static bool deflate_monitor(ObjectMonitor* mid, oop obj,
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ObjectMonitor** freeHeadp,
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ObjectMonitor** freeTailp);
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static bool is_cleanup_needed();
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static void oops_do(OopClosure* f);
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// Process oops in thread local used monitors
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static void thread_local_used_oops_do(Thread* thread, OopClosure* f);
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// debugging
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static void sanity_checks(const bool verbose,
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const unsigned int cache_line_size,
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int *error_cnt_ptr, int *warning_cnt_ptr);
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static int verify_objmon_isinpool(ObjectMonitor *addr) PRODUCT_RETURN0;
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private:
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enum { _BLOCKSIZE = 128 };
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// global list of blocks of monitors
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// gBlockList is really PaddedEnd<ObjectMonitor> *, but we don't
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// want to expose the PaddedEnd template more than necessary.
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static ObjectMonitor * volatile gBlockList;
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// global monitor free list
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static ObjectMonitor * volatile gFreeList;
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// global monitor in-use list, for moribund threads,
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// monitors they inflated need to be scanned for deflation
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static ObjectMonitor * volatile gOmInUseList;
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// count of entries in gOmInUseList
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static int gOmInUseCount;
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// Process oops in all monitors
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static void global_oops_do(OopClosure* f);
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// Process oops in all global used monitors (i.e. moribund thread's monitors)
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static void global_used_oops_do(OopClosure* f);
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// Process oops in monitors on the given list
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static void list_oops_do(ObjectMonitor* list, OopClosure* f);
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};
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// ObjectLocker enforced balanced locking and can never thrown an
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// IllegalMonitorStateException. However, a pending exception may
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// have to pass through, and we must also be able to deal with
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// asynchronous exceptions. The caller is responsible for checking
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// the threads pending exception if needed.
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// doLock was added to support classloading with UnsyncloadClass which
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// requires flag based choice of locking the classloader lock.
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class ObjectLocker : public StackObj {
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private:
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Thread* _thread;
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Handle _obj;
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BasicLock _lock;
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bool _dolock; // default true
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public:
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ObjectLocker(Handle obj, Thread* thread, bool doLock = true);
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~ObjectLocker();
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// Monitor behavior
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void wait(TRAPS) { ObjectSynchronizer::wait(_obj, 0, CHECK); } // wait forever
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void notify_all(TRAPS) { ObjectSynchronizer::notifyall(_obj, CHECK); }
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void waitUninterruptibly(TRAPS) { ObjectSynchronizer::waitUninterruptibly(_obj, 0, CHECK); }
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// complete_exit gives up lock completely, returning recursion count
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// reenter reclaims lock with original recursion count
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intptr_t complete_exit(TRAPS) { return ObjectSynchronizer::complete_exit(_obj, THREAD); }
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void reenter(intptr_t recursion, TRAPS) { ObjectSynchronizer::reenter(_obj, recursion, CHECK); }
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};
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#endif // SHARE_VM_RUNTIME_SYNCHRONIZER_HPP
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