1/*
2 * Copyright (c) 2024 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
16#ifndef ECMASCRIPT_MUTATOR_LOCK_H
17#define ECMASCRIPT_MUTATOR_LOCK_H
18
19#include "ecmascript/platform/mutex.h"
20
21namespace panda::ecmascript {
22
23class MutatorLock : public RWLock {
24#ifndef NDEBUG
25public:
26    enum MutatorLockState { UNLOCKED, RDLOCK, WRLOCK };
27    void ReadLock();
28    void WriteLock();
29    bool TryReadLock();
30    bool TryWriteLock();
31    void Unlock();
32    bool HasLock() const;
33
34private:
35    MutatorLockState GetState() const;
36    void SetState(MutatorLockState newState);
37#endif
38};
39
40class SuspendBarrier {
41public:
42    SuspendBarrier() : passBarrierCount_(0)
43    {
44    }
45
46    explicit SuspendBarrier(int32_t count) : passBarrierCount_(count)
47    {
48    }
49
50    void Wait();
51
52    void Pass()
53    {
54        PassCount(-1);
55    }
56
57    void PassStrongly()
58    {
59        passBarrierCount_.fetch_sub(1, std::memory_order_seq_cst);
60    }
61
62    void Initialize(int32_t count)
63    {
64        passBarrierCount_.store(count, std::memory_order_relaxed);
65    }
66
67    void Increment(int32_t delta)
68    {
69        PassCount(delta);
70        Wait();
71    }
72
73private:
74    void PassCount(int32_t delta);
75    std::atomic<int32_t> passBarrierCount_;
76};
77
78}  // namespace panda::ecmascript
79#endif // ECMASCRIPT_MUTATOR_LOCK_H