Elliott Hughes | 5f79133 | 2011-09-15 17:45:30 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2008 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
Elliott Hughes | 54e7df1 | 2011-09-16 11:47:04 -0700 | [diff] [blame] | 17 | #ifndef ART_SRC_MONITOR_H_ |
| 18 | #define ART_SRC_MONITOR_H_ |
Elliott Hughes | 5f79133 | 2011-09-15 17:45:30 -0700 | [diff] [blame] | 19 | |
| 20 | #include <pthread.h> |
| 21 | #include <stdint.h> |
| 22 | |
| 23 | #include "mutex.h" |
| 24 | |
| 25 | namespace art { |
| 26 | |
| 27 | /* |
| 28 | * Monitor shape field. Used to distinguish thin locks from fat locks. |
| 29 | */ |
| 30 | #define LW_SHAPE_THIN 0 |
| 31 | #define LW_SHAPE_FAT 1 |
| 32 | #define LW_SHAPE_MASK 0x1 |
| 33 | #define LW_SHAPE(x) ((x) & LW_SHAPE_MASK) |
| 34 | |
| 35 | /* |
| 36 | * Hash state field. Used to signify that an object has had its |
| 37 | * identity hash code exposed or relocated. |
| 38 | */ |
| 39 | #define LW_HASH_STATE_UNHASHED 0 |
| 40 | #define LW_HASH_STATE_HASHED 1 |
| 41 | #define LW_HASH_STATE_HASHED_AND_MOVED 3 |
| 42 | #define LW_HASH_STATE_MASK 0x3 |
| 43 | #define LW_HASH_STATE_SHIFT 1 |
| 44 | #define LW_HASH_STATE(x) (((x) >> LW_HASH_STATE_SHIFT) & LW_HASH_STATE_MASK) |
| 45 | |
| 46 | /* |
Elliott Hughes | 5f79133 | 2011-09-15 17:45:30 -0700 | [diff] [blame] | 47 | * Lock owner field. Contains the thread id of the thread currently |
| 48 | * holding the lock. |
| 49 | */ |
| 50 | #define LW_LOCK_OWNER_MASK 0xffff |
| 51 | #define LW_LOCK_OWNER_SHIFT 3 |
| 52 | #define LW_LOCK_OWNER(x) (((x) >> LW_LOCK_OWNER_SHIFT) & LW_LOCK_OWNER_MASK) |
| 53 | |
Elliott Hughes | 54e7df1 | 2011-09-16 11:47:04 -0700 | [diff] [blame] | 54 | class Object; |
| 55 | class Thread; |
Elliott Hughes | 5f79133 | 2011-09-15 17:45:30 -0700 | [diff] [blame] | 56 | |
| 57 | class Monitor { |
| 58 | public: |
| 59 | ~Monitor(); |
| 60 | |
| 61 | static uint32_t GetLockOwner(uint32_t raw_lock_word); |
| 62 | |
| 63 | static void MonitorEnter(Thread* thread, Object* obj); |
| 64 | static bool MonitorExit(Thread* thread, Object* obj); |
| 65 | |
| 66 | static void Notify(Thread* self, Object* obj); |
| 67 | static void NotifyAll(Thread* self, Object* obj); |
| 68 | static void Wait(Thread* self, Object* obj, int64_t ms, int32_t ns, bool interruptShouldThrow); |
| 69 | |
| 70 | static void SweepMonitorList(bool (isUnmarkedObject)(void*)); |
| 71 | |
| 72 | static void FreeMonitorList(); |
| 73 | |
| 74 | private: |
| 75 | Monitor(Object* obj); |
| 76 | |
| 77 | void AppendToWaitSet(Thread* thread); |
| 78 | void RemoveFromWaitSet(Thread* thread); |
| 79 | |
| 80 | static void Inflate(Thread* self, Object* obj); |
| 81 | |
| 82 | void Lock(Thread* self); |
| 83 | bool Unlock(Thread* thread); |
| 84 | |
| 85 | void Notify(Thread* self); |
| 86 | void NotifyAll(Thread* self); |
| 87 | |
| 88 | void Wait(Thread* self, int64_t msec, int32_t nsec, bool interruptShouldThrow); |
| 89 | |
| 90 | /* Which thread currently owns the lock? */ |
| 91 | Thread* owner_; |
| 92 | |
| 93 | /* Owner's recursive lock depth */ |
| 94 | int lock_count_; |
| 95 | |
| 96 | /* What object are we part of (for debugging). */ |
| 97 | Object* obj_; |
| 98 | |
| 99 | /* Threads currently waiting on this monitor. */ |
| 100 | Thread* wait_set_; |
| 101 | |
| 102 | Mutex lock_; |
| 103 | |
| 104 | Monitor* next_; |
| 105 | |
| 106 | /* |
| 107 | * Who last acquired this monitor, when lock sampling is enabled. |
| 108 | * Even when enabled, ownerFileName may be NULL. |
| 109 | */ |
| 110 | const char* owner_filename_; |
| 111 | uint32_t owner_line_number_; |
| 112 | |
| 113 | friend class Object; |
| 114 | }; |
| 115 | |
| 116 | /* |
| 117 | * Relative timed wait on condition |
| 118 | */ |
| 119 | int dvmRelativeCondWait(pthread_cond_t* cond, pthread_mutex_t* mutex, int64_t msec, int32_t nsec); |
| 120 | |
| 121 | } // namespace art |
| 122 | |
Elliott Hughes | 54e7df1 | 2011-09-16 11:47:04 -0700 | [diff] [blame] | 123 | #endif // ART_SRC_MONITOR_H_ |