1 /** 2 * Copyright (c) 2021-2022 Huawei Device Co., Ltd. 3 * Licensed under the Apache License, Version 2.0 (the "License"); 4 * you may not use this file except in compliance with the License. 5 * You may obtain a copy of the License at 6 * 7 * http://www.apache.org/licenses/LICENSE-2.0 8 * 9 * Unless required by applicable law or agreed to in writing, software 10 * distributed under the License is distributed on an "AS IS" BASIS, 11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 * See the License for the specific language governing permissions and 13 * limitations under the License. 14 */ 15 #ifndef PANDA_RUNTIME_LOCKS_H_ 16 #define PANDA_RUNTIME_LOCKS_H_ 17 18 #include "libpandabase/os/mutex.h" 19 20 #include <memory> 21 22 namespace panda { 23 24 class MutatorLock : public os::memory::RWLock { 25 #ifndef NDEBUG 26 public: 27 enum MutatorLockState { UNLOCKED, RDLOCK, WRLOCK }; 28 29 void ReadLock() ACQUIRE_SHARED(); 30 31 void WriteLock() ACQUIRE(); 32 33 bool TryReadLock() TRY_ACQUIRE_SHARED(true); 34 35 bool TryWriteLock() TRY_ACQUIRE(true); 36 37 void Unlock() RELEASE_GENERIC(); 38 39 MutatorLockState GetState(); 40 41 bool HasLock(); 42 #endif // !NDEBUG 43 }; 44 45 class Locks { 46 public: 47 static void Initialize(); 48 49 /** 50 * Lock used for preventing object heap modifications (for example at GC<->JIT,ManagedCode interaction during STW) 51 */ 52 static MutatorLock *mutator_lock; // NOLINT(misc-non-private-member-variables-in-classes) 53 /** 54 * Lock used for preventing custom_tls_cache_ modifications 55 */ 56 static os::memory::Mutex *custom_tls_lock; // NOLINT(misc-non-private-member-variables-in-classes) 57 58 /** 59 * The lock is a specific lock for exclusive suspension process, 60 * It is static for access from JVMTI interface 61 */ 62 static os::memory::Mutex *user_suspension_lock; 63 }; 64 65 } // namespace panda 66 67 #endif // PANDA_RUNTIME_LOCKS_H_ 68