4a33afe6c4
Added an ifndef DONT_USE_PRECOMPILED_HEADER to precompiled.hpp. Set up DONT_USE_PRECOMPILED_HEADER when compiling with Sun Studio or when the user specifies USE_PRECOMPILED_HEADER=0. Fixed broken include dependencies. Reviewed-by: coleenp, kvn
318 lines
12 KiB
C++
318 lines
12 KiB
C++
/*
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* Copyright (c) 1998, 2010, 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_OBJECTMONITOR_HPP
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#define SHARE_VM_RUNTIME_OBJECTMONITOR_HPP
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#include "runtime/os.hpp"
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#include "runtime/park.hpp"
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#include "runtime/perfData.hpp"
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// ObjectWaiter serves as a "proxy" or surrogate thread.
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// TODO-FIXME: Eliminate ObjectWaiter and use the thread-specific
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// ParkEvent instead. Beware, however, that the JVMTI code
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// knows about ObjectWaiters, so we'll have to reconcile that code.
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// See next_waiter(), first_waiter(), etc.
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class ObjectWaiter : public StackObj {
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public:
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enum TStates { TS_UNDEF, TS_READY, TS_RUN, TS_WAIT, TS_ENTER, TS_CXQ } ;
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enum Sorted { PREPEND, APPEND, SORTED } ;
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ObjectWaiter * volatile _next;
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ObjectWaiter * volatile _prev;
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Thread* _thread;
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ParkEvent * _event;
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volatile int _notified ;
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volatile TStates TState ;
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Sorted _Sorted ; // List placement disposition
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bool _active ; // Contention monitoring is enabled
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public:
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ObjectWaiter(Thread* thread);
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void wait_reenter_begin(ObjectMonitor *mon);
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void wait_reenter_end(ObjectMonitor *mon);
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};
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// WARNING:
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// This is a very sensitive and fragile class. DO NOT make any
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// change unless you are fully aware of the underlying semantics.
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// This class can not inherit from any other class, because I have
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// to let the displaced header be the very first word. Otherwise I
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// have to let markOop include this file, which would export the
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// monitor data structure to everywhere.
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//
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// The ObjectMonitor class is used to implement JavaMonitors which have
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// transformed from the lightweight structure of the thread stack to a
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// heavy weight lock due to contention
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// It is also used as RawMonitor by the JVMTI
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class ObjectMonitor {
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public:
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enum {
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OM_OK, // no error
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OM_SYSTEM_ERROR, // operating system error
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OM_ILLEGAL_MONITOR_STATE, // IllegalMonitorStateException
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OM_INTERRUPTED, // Thread.interrupt()
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OM_TIMED_OUT // Object.wait() timed out
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};
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public:
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// TODO-FIXME: the "offset" routines should return a type of off_t instead of int ...
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// ByteSize would also be an appropriate type.
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static int header_offset_in_bytes() { return offset_of(ObjectMonitor, _header); }
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static int object_offset_in_bytes() { return offset_of(ObjectMonitor, _object); }
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static int owner_offset_in_bytes() { return offset_of(ObjectMonitor, _owner); }
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static int count_offset_in_bytes() { return offset_of(ObjectMonitor, _count); }
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static int recursions_offset_in_bytes() { return offset_of(ObjectMonitor, _recursions); }
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static int cxq_offset_in_bytes() { return offset_of(ObjectMonitor, _cxq) ; }
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static int succ_offset_in_bytes() { return offset_of(ObjectMonitor, _succ) ; }
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static int EntryList_offset_in_bytes() { return offset_of(ObjectMonitor, _EntryList); }
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static int FreeNext_offset_in_bytes() { return offset_of(ObjectMonitor, FreeNext); }
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static int WaitSet_offset_in_bytes() { return offset_of(ObjectMonitor, _WaitSet) ; }
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static int Responsible_offset_in_bytes() { return offset_of(ObjectMonitor, _Responsible);}
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static int Spinner_offset_in_bytes() { return offset_of(ObjectMonitor, _Spinner); }
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public:
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// Eventaully we'll make provisions for multiple callbacks, but
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// now one will suffice.
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static int (*SpinCallbackFunction)(intptr_t, int) ;
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static intptr_t SpinCallbackArgument ;
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public:
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markOop header() const;
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void set_header(markOop hdr);
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intptr_t is_busy() const {
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// TODO-FIXME: merge _count and _waiters.
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// TODO-FIXME: assert _owner == null implies _recursions = 0
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// TODO-FIXME: assert _WaitSet != null implies _count > 0
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return _count|_waiters|intptr_t(_owner)|intptr_t(_cxq)|intptr_t(_EntryList ) ;
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}
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intptr_t is_entered(Thread* current) const;
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void* owner() const;
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void set_owner(void* owner);
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intptr_t waiters() const;
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intptr_t count() const;
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void set_count(intptr_t count);
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intptr_t contentions() const ;
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intptr_t recursions() const { return _recursions; }
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// JVM/DI GetMonitorInfo() needs this
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ObjectWaiter* first_waiter() { return _WaitSet; }
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ObjectWaiter* next_waiter(ObjectWaiter* o) { return o->_next; }
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Thread* thread_of_waiter(ObjectWaiter* o) { return o->_thread; }
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// initialize the monitor, exception the semaphore, all other fields
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// are simple integers or pointers
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ObjectMonitor() {
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_header = NULL;
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_count = 0;
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_waiters = 0,
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_recursions = 0;
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_object = NULL;
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_owner = NULL;
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_WaitSet = NULL;
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_WaitSetLock = 0 ;
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_Responsible = NULL ;
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_succ = NULL ;
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_cxq = NULL ;
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FreeNext = NULL ;
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_EntryList = NULL ;
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_SpinFreq = 0 ;
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_SpinClock = 0 ;
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OwnerIsThread = 0 ;
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}
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~ObjectMonitor() {
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// TODO: Add asserts ...
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// _cxq == 0 _succ == NULL _owner == NULL _waiters == 0
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// _count == 0 _EntryList == NULL etc
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}
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private:
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void Recycle () {
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// TODO: add stronger asserts ...
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// _cxq == 0 _succ == NULL _owner == NULL _waiters == 0
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// _count == 0 EntryList == NULL
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// _recursions == 0 _WaitSet == NULL
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// TODO: assert (is_busy()|_recursions) == 0
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_succ = NULL ;
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_EntryList = NULL ;
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_cxq = NULL ;
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_WaitSet = NULL ;
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_recursions = 0 ;
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_SpinFreq = 0 ;
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_SpinClock = 0 ;
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OwnerIsThread = 0 ;
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}
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public:
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void* object() const;
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void* object_addr();
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void set_object(void* obj);
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bool check(TRAPS); // true if the thread owns the monitor.
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void check_slow(TRAPS);
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void clear();
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#ifndef PRODUCT
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void verify();
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void print();
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#endif
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bool try_enter (TRAPS) ;
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void enter(TRAPS);
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void exit(TRAPS);
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void wait(jlong millis, bool interruptable, TRAPS);
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void notify(TRAPS);
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void notifyAll(TRAPS);
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// Use the following at your own risk
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intptr_t complete_exit(TRAPS);
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void reenter(intptr_t recursions, TRAPS);
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private:
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void AddWaiter (ObjectWaiter * waiter) ;
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static void DeferredInitialize();
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ObjectWaiter * DequeueWaiter () ;
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void DequeueSpecificWaiter (ObjectWaiter * waiter) ;
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void EnterI (TRAPS) ;
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void ReenterI (Thread * Self, ObjectWaiter * SelfNode) ;
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void UnlinkAfterAcquire (Thread * Self, ObjectWaiter * SelfNode) ;
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int TryLock (Thread * Self) ;
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int NotRunnable (Thread * Self, Thread * Owner) ;
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int TrySpin_Fixed (Thread * Self) ;
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int TrySpin_VaryFrequency (Thread * Self) ;
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int TrySpin_VaryDuration (Thread * Self) ;
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void ctAsserts () ;
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void ExitEpilog (Thread * Self, ObjectWaiter * Wakee) ;
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bool ExitSuspendEquivalent (JavaThread * Self) ;
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private:
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friend class ObjectSynchronizer;
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friend class ObjectWaiter;
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friend class VMStructs;
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// WARNING: this must be the very first word of ObjectMonitor
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// This means this class can't use any virtual member functions.
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// TODO-FIXME: assert that offsetof(_header) is 0 or get rid of the
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// implicit 0 offset in emitted code.
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volatile markOop _header; // displaced object header word - mark
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void* volatile _object; // backward object pointer - strong root
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double SharingPad [1] ; // temp to reduce false sharing
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// All the following fields must be machine word aligned
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// The VM assumes write ordering wrt these fields, which can be
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// read from other threads.
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protected: // protected for jvmtiRawMonitor
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void * volatile _owner; // pointer to owning thread OR BasicLock
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volatile intptr_t _recursions; // recursion count, 0 for first entry
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private:
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int OwnerIsThread ; // _owner is (Thread *) vs SP/BasicLock
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ObjectWaiter * volatile _cxq ; // LL of recently-arrived threads blocked on entry.
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// The list is actually composed of WaitNodes, acting
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// as proxies for Threads.
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protected:
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ObjectWaiter * volatile _EntryList ; // Threads blocked on entry or reentry.
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private:
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Thread * volatile _succ ; // Heir presumptive thread - used for futile wakeup throttling
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Thread * volatile _Responsible ;
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int _PromptDrain ; // rqst to drain cxq into EntryList ASAP
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volatile int _Spinner ; // for exit->spinner handoff optimization
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volatile int _SpinFreq ; // Spin 1-out-of-N attempts: success rate
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volatile int _SpinClock ;
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volatile int _SpinDuration ;
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volatile intptr_t _SpinState ; // MCS/CLH list of spinners
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// TODO-FIXME: _count, _waiters and _recursions should be of
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// type int, or int32_t but not intptr_t. There's no reason
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// to use 64-bit fields for these variables on a 64-bit JVM.
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volatile intptr_t _count; // reference count to prevent reclaimation/deflation
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// at stop-the-world time. See deflate_idle_monitors().
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// _count is approximately |_WaitSet| + |_EntryList|
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protected:
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volatile intptr_t _waiters; // number of waiting threads
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private:
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protected:
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ObjectWaiter * volatile _WaitSet; // LL of threads wait()ing on the monitor
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private:
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volatile int _WaitSetLock; // protects Wait Queue - simple spinlock
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public:
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int _QMix ; // Mixed prepend queue discipline
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ObjectMonitor * FreeNext ; // Free list linkage
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intptr_t StatA, StatsB ;
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public:
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static void Initialize () ;
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static PerfCounter * _sync_ContendedLockAttempts ;
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static PerfCounter * _sync_FutileWakeups ;
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static PerfCounter * _sync_Parks ;
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static PerfCounter * _sync_EmptyNotifications ;
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static PerfCounter * _sync_Notifications ;
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static PerfCounter * _sync_SlowEnter ;
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static PerfCounter * _sync_SlowExit ;
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static PerfCounter * _sync_SlowNotify ;
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static PerfCounter * _sync_SlowNotifyAll ;
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static PerfCounter * _sync_FailedSpins ;
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static PerfCounter * _sync_SuccessfulSpins ;
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static PerfCounter * _sync_PrivateA ;
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static PerfCounter * _sync_PrivateB ;
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static PerfCounter * _sync_MonInCirculation ;
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static PerfCounter * _sync_MonScavenged ;
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static PerfCounter * _sync_Inflations ;
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static PerfCounter * _sync_Deflations ;
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static PerfLongVariable * _sync_MonExtant ;
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public:
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static int Knob_Verbose;
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static int Knob_SpinLimit;
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};
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#undef TEVENT
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#define TEVENT(nom) {if (SyncVerbose) FEVENT(nom); }
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#define FEVENT(nom) { static volatile int ctr = 0 ; int v = ++ctr ; if ((v & (v-1)) == 0) { ::printf (#nom " : %d \n", v); ::fflush(stdout); }}
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#undef TEVENT
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#define TEVENT(nom) {;}
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#endif // SHARE_VM_RUNTIME_OBJECTMONITOR_HPP
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