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86 lines
2.8 KiB
86 lines
2.8 KiB
/*
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* Copyright (C) 2008 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef ART_RUNTIME_MONITOR_INL_H_
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#define ART_RUNTIME_MONITOR_INL_H_
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#include "monitor.h"
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#include "gc_root-inl.h"
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#include "obj_ptr-inl.h"
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namespace art {
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template<ReadBarrierOption kReadBarrierOption>
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inline ObjPtr<mirror::Object> Monitor::GetObject() REQUIRES_SHARED(Locks::mutator_lock_) {
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return obj_.Read<kReadBarrierOption>();
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}
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// Check for request to set lock owner info.
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void Monitor::CheckLockOwnerRequest(Thread* self) {
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DCHECK(self != nullptr);
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Thread* request_thread = lock_owner_request_.load(std::memory_order_relaxed);
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if (request_thread == self) {
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SetLockingMethod(self);
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// Only do this the first time after a request.
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lock_owner_request_.store(nullptr, std::memory_order_relaxed);
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}
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}
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uintptr_t Monitor::LockOwnerInfoChecksum(ArtMethod* m, uint32_t dex_pc, Thread* t) {
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uintptr_t dpc_and_thread = static_cast<uintptr_t>(dex_pc << 8) ^ reinterpret_cast<uintptr_t>(t);
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return reinterpret_cast<uintptr_t>(m) ^ dpc_and_thread
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^ (dpc_and_thread << (/* ptr_size / 2 */ (sizeof m) << 2));
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}
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void Monitor::SetLockOwnerInfo(ArtMethod* method, uint32_t dex_pc, Thread* t) {
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lock_owner_method_.store(method, std::memory_order_relaxed);
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lock_owner_dex_pc_.store(dex_pc, std::memory_order_relaxed);
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lock_owner_.store(t, std::memory_order_relaxed);
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uintptr_t sum = LockOwnerInfoChecksum(method, dex_pc, t);
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lock_owner_sum_.store(sum, std::memory_order_relaxed);
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}
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void Monitor::GetLockOwnerInfo(/*out*/ArtMethod** method, /*out*/uint32_t* dex_pc,
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Thread* t) {
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ArtMethod* owners_method;
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uint32_t owners_dex_pc;
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Thread* owner;
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uintptr_t owners_sum;
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DCHECK(t != nullptr);
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do {
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owner = lock_owner_.load(std::memory_order_relaxed);
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if (owner == nullptr) {
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break;
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}
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owners_method = lock_owner_method_.load(std::memory_order_relaxed);
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owners_dex_pc = lock_owner_dex_pc_.load(std::memory_order_relaxed);
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owners_sum = lock_owner_sum_.load(std::memory_order_relaxed);
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} while (owners_sum != LockOwnerInfoChecksum(owners_method, owners_dex_pc, owner));
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if (owner == t) {
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*method = owners_method;
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*dex_pc = owners_dex_pc;
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} else {
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*method = nullptr;
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*dex_pc = 0;
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}
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}
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} // namespace art
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#endif // ART_RUNTIME_MONITOR_INL_H_
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