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/*
* Copyright (C) 2008 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef ART_SRC_MONITOR_H_
#define ART_SRC_MONITOR_H_
#include <pthread.h>
#include <stdint.h>
#include "mutex.h"
namespace art {
/*
* Monitor shape field. Used to distinguish thin locks from fat locks.
*/
#define LW_SHAPE_THIN 0
#define LW_SHAPE_FAT 1
#define LW_SHAPE_MASK 0x1
#define LW_SHAPE(x) ((x) & LW_SHAPE_MASK)
/*
* Hash state field. Used to signify that an object has had its
* identity hash code exposed or relocated.
*/
#define LW_HASH_STATE_UNHASHED 0
#define LW_HASH_STATE_HASHED 1
#define LW_HASH_STATE_HASHED_AND_MOVED 3
#define LW_HASH_STATE_MASK 0x3
#define LW_HASH_STATE_SHIFT 1
#define LW_HASH_STATE(x) (((x) >> LW_HASH_STATE_SHIFT) & LW_HASH_STATE_MASK)
/*
* Lock owner field. Contains the thread id of the thread currently
* holding the lock.
*/
#define LW_LOCK_OWNER_MASK 0xffff
#define LW_LOCK_OWNER_SHIFT 3
#define LW_LOCK_OWNER(x) (((x) >> LW_LOCK_OWNER_SHIFT) & LW_LOCK_OWNER_MASK)
class Object;
class Thread;
class Monitor {
public:
~Monitor();
static uint32_t GetLockOwner(uint32_t raw_lock_word);
static void MonitorEnter(Thread* thread, Object* obj);
static bool MonitorExit(Thread* thread, Object* obj);
static void Notify(Thread* self, Object* obj);
static void NotifyAll(Thread* self, Object* obj);
static void Wait(Thread* self, Object* obj, int64_t ms, int32_t ns, bool interruptShouldThrow);
static void SweepMonitorList(bool (isUnmarkedObject)(void*));
static void FreeMonitorList();
private:
Monitor(Object* obj);
void AppendToWaitSet(Thread* thread);
void RemoveFromWaitSet(Thread* thread);
static void Inflate(Thread* self, Object* obj);
void Lock(Thread* self);
bool Unlock(Thread* thread);
void Notify(Thread* self);
void NotifyAll(Thread* self);
void Wait(Thread* self, int64_t msec, int32_t nsec, bool interruptShouldThrow);
/* Which thread currently owns the lock? */
Thread* owner_;
/* Owner's recursive lock depth */
int lock_count_;
/* What object are we part of (for debugging). */
Object* obj_;
/* Threads currently waiting on this monitor. */
Thread* wait_set_;
Mutex lock_;
Monitor* next_;
/*
* Who last acquired this monitor, when lock sampling is enabled.
* Even when enabled, ownerFileName may be NULL.
*/
const char* owner_filename_;
uint32_t owner_line_number_;
friend class Object;
};
/*
* Relative timed wait on condition
*/
int dvmRelativeCondWait(pthread_cond_t* cond, pthread_mutex_t* mutex, int64_t msec, int32_t nsec);
} // namespace art
#endif // ART_SRC_MONITOR_H_