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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_RUNTIME_MONITOR_INL_H_
#define ART_RUNTIME_MONITOR_INL_H_
#include "monitor.h"
#include "gc_root-inl.h"
#include "obj_ptr-inl.h"
namespace art {
template<ReadBarrierOption kReadBarrierOption>
inline ObjPtr<mirror::Object> Monitor::GetObject() REQUIRES_SHARED(Locks::mutator_lock_) {
return obj_.Read<kReadBarrierOption>();
}
// Check for request to set lock owner info.
void Monitor::CheckLockOwnerRequest(Thread* self) {
DCHECK(self != nullptr);
Thread* request_thread = lock_owner_request_.load(std::memory_order_relaxed);
if (request_thread == self) {
SetLockingMethod(self);
// Only do this the first time after a request.
lock_owner_request_.store(nullptr, std::memory_order_relaxed);
}
}
uintptr_t Monitor::LockOwnerInfoChecksum(ArtMethod* m, uint32_t dex_pc, Thread* t) {
uintptr_t dpc_and_thread = static_cast<uintptr_t>(dex_pc << 8) ^ reinterpret_cast<uintptr_t>(t);
return reinterpret_cast<uintptr_t>(m) ^ dpc_and_thread
^ (dpc_and_thread << (/* ptr_size / 2 */ (sizeof m) << 2));
}
void Monitor::SetLockOwnerInfo(ArtMethod* method, uint32_t dex_pc, Thread* t) {
lock_owner_method_.store(method, std::memory_order_relaxed);
lock_owner_dex_pc_.store(dex_pc, std::memory_order_relaxed);
lock_owner_.store(t, std::memory_order_relaxed);
uintptr_t sum = LockOwnerInfoChecksum(method, dex_pc, t);
lock_owner_sum_.store(sum, std::memory_order_relaxed);
}
void Monitor::GetLockOwnerInfo(/*out*/ArtMethod** method, /*out*/uint32_t* dex_pc,
Thread* t) {
ArtMethod* owners_method;
uint32_t owners_dex_pc;
Thread* owner;
uintptr_t owners_sum;
DCHECK(t != nullptr);
do {
owner = lock_owner_.load(std::memory_order_relaxed);
if (owner == nullptr) {
break;
}
owners_method = lock_owner_method_.load(std::memory_order_relaxed);
owners_dex_pc = lock_owner_dex_pc_.load(std::memory_order_relaxed);
owners_sum = lock_owner_sum_.load(std::memory_order_relaxed);
} while (owners_sum != LockOwnerInfoChecksum(owners_method, owners_dex_pc, owner));
if (owner == t) {
*method = owners_method;
*dex_pc = owners_dex_pc;
} else {
*method = nullptr;
*dex_pc = 0;
}
}
} // namespace art
#endif // ART_RUNTIME_MONITOR_INL_H_
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