src/hotspot/share/runtime/synchronizer.hpp
author erikj
Tue, 12 Sep 2017 19:03:39 +0200
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parent 46702 hotspot/src/share/vm/runtime/synchronizer.hpp@13ae789b982e
child 47634 6a0c42c40cd1
permissions -rw-r--r--
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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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  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