mirror of
https://github.com/openharmony/ark_runtime_core.git
synced 2026-07-18 18:24:30 -04:00
Ilya Trubachev
97 lines
2.8 KiB
C++
97 lines
2.8 KiB
C++
/*
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* Copyright (c) 2021-2022 Huawei Device Co., Ltd.
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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 PANDA_RUNTIME_MEM_RENDEZVOUS_H_
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#define PANDA_RUNTIME_MEM_RENDEZVOUS_H_
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#include <atomic>
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#include "libpandabase/os/mutex.h"
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#include "macros.h"
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#include "runtime/include/thread.h"
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#include "include/locks.h"
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namespace panda {
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/** Meeting point for all java threads.
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* High level plan:
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* * Check if there's already a main thread (running_)
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* * If there is, wait until we get woken up
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* * Otherwise, acquire write global Mutator lock and set field running_
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*/
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class Rendezvous {
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public:
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explicit Rendezvous() = default;
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virtual ~Rendezvous() = default;
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// Wait until all threads release Mutator lock and acquires it for write;
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virtual void SafepointBegin() ACQUIRE(*Locks::mutator_lock);
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// Ends safepoint (wakes up waiting threads, releases Mutator lock);
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virtual void SafepointEnd() RELEASE(*Locks::mutator_lock);
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private:
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NO_MOVE_SEMANTIC(Rendezvous);
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NO_COPY_SEMANTIC(Rendezvous);
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};
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class EmptyRendezvous final : public Rendezvous {
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public:
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explicit EmptyRendezvous() = default;
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~EmptyRendezvous() override = default;
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void SafepointBegin() override {}
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void SafepointEnd() override {}
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private:
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NO_MOVE_SEMANTIC(EmptyRendezvous);
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NO_COPY_SEMANTIC(EmptyRendezvous);
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};
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class ScopedSuspendAllThreads {
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public:
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explicit ScopedSuspendAllThreads(Rendezvous *rendezvous) ACQUIRE(*Locks::mutator_lock) : rendezvous_(rendezvous)
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{
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ASSERT(rendezvous_ != nullptr);
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rendezvous_->SafepointBegin();
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}
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~ScopedSuspendAllThreads() RELEASE(*Locks::mutator_lock)
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{
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ASSERT(rendezvous_ != nullptr);
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rendezvous_->SafepointEnd();
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}
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NO_COPY_SEMANTIC(ScopedSuspendAllThreads);
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NO_MOVE_SEMANTIC(ScopedSuspendAllThreads);
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private:
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Rendezvous *rendezvous_;
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};
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class ScopedSuspendAllThreadsRunning {
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public:
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explicit ScopedSuspendAllThreadsRunning(Rendezvous *rendezvous) ACQUIRE(*Locks::mutator_lock);
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~ScopedSuspendAllThreadsRunning() RELEASE(*Locks::mutator_lock);
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NO_COPY_SEMANTIC(ScopedSuspendAllThreadsRunning);
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NO_MOVE_SEMANTIC(ScopedSuspendAllThreadsRunning);
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private:
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Rendezvous *rendezvous_;
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};
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} // namespace panda
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#endif // PANDA_RUNTIME_MEM_RENDEZVOUS_H_
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