author | dcubed |
Wed, 20 Nov 2019 09:10:02 -0500 | |
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/* |
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* Copyright (c) 1998, 2019, 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_RUNTIME_SYNCHRONIZER_HPP |
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#define SHARE_RUNTIME_SYNCHRONIZER_HPP |
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#include "memory/padded.hpp" |
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#include "oops/markWord.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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class ThreadsList; |
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typedef PaddedEnd<ObjectMonitor, DEFAULT_CACHE_LINE_SIZE> PaddedObjectMonitor; |
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struct DeflateMonitorCounters { |
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int n_in_use; // currently associated with objects |
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int n_in_circulation; // extant |
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int n_scavenged; // reclaimed (global and per-thread) |
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int per_thread_scavenged; // per-thread scavenge total |
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double per_thread_times; // per-thread scavenge times |
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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 the "slow path" version of monitor enter and exit. |
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static void enter(Handle obj, BasicLock* lock, TRAPS); |
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static void 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 wait_uninterruptibly(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 intx complete_exit(Handle obj, TRAPS); |
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static void reenter (Handle obj, intx recursions, TRAPS); |
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// thread-specific and global ObjectMonitor free list accessors |
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static ObjectMonitor* om_alloc(Thread* self); |
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static void om_release(Thread* self, ObjectMonitor* m, |
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bool FromPerThreadAlloc); |
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static void om_flush(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 void 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(ThreadsList * t_list, Handle h_obj); |
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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** list_p, |
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ObjectMonitor** free_head_p, |
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ObjectMonitor** free_tail_p); |
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static bool deflate_monitor(ObjectMonitor* mid, oop obj, |
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ObjectMonitor** free_head_p, |
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ObjectMonitor** free_tail_p); |
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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 audit_and_print_stats(bool on_exit); |
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static void chk_free_entry(JavaThread* jt, ObjectMonitor* n, |
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outputStream * out, int *error_cnt_p); |
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static void chk_global_free_list_and_count(outputStream * out, |
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int *error_cnt_p); |
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static void chk_global_in_use_list_and_count(outputStream * out, |
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int *error_cnt_p); |
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static void chk_in_use_entry(JavaThread* jt, ObjectMonitor* n, |
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outputStream * out, int *error_cnt_p); |
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static void chk_per_thread_in_use_list_and_count(JavaThread *jt, |
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outputStream * out, |
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int *error_cnt_p); |
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static void chk_per_thread_free_list_and_count(JavaThread *jt, |
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outputStream * out, |
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int *error_cnt_p); |
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static void log_in_use_monitor_details(outputStream * out, bool on_exit); |
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static int log_monitor_list_counts(outputStream * out); |
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static int verify_objmon_isinpool(ObjectMonitor *addr) PRODUCT_RETURN0; |
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private: |
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friend class SynchronizerTest; |
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enum { _BLOCKSIZE = 128 }; |
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// global list of blocks of monitors |
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static PaddedObjectMonitor* volatile g_block_list; |
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// global monitor free list |
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static ObjectMonitor* volatile g_free_list; |
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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 g_om_in_use_list; |
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// count of entries in g_om_in_use_list |
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static int g_om_in_use_count; |
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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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// Support for SynchronizerTest access to GVars fields: |
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static u_char* get_gvars_addr(); |
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static u_char* get_gvars_hc_sequence_addr(); |
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static size_t get_gvars_size(); |
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static u_char* get_gvars_stw_random_addr(); |
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}; |
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// ObjectLocker enforces balanced locking and can never throw 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 thread's pending exception if needed. |
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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 do_lock = 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 wait_uninterruptibly(TRAPS) { ObjectSynchronizer::wait_uninterruptibly(_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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intx complete_exit(TRAPS) { return ObjectSynchronizer::complete_exit(_obj, THREAD); } |
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void reenter(intx recursions, TRAPS) { ObjectSynchronizer::reenter(_obj, recursions, CHECK); } |
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}; |
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#endif // SHARE_RUNTIME_SYNCHRONIZER_HPP |