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src: use RAII for mutexes and condition variables
We will be introducing many more critical sections in the upcoming multi-isolate changes, so let's make manual synchronization a thing of the past. PR-URL: #7334 Reviewed-By: Colin Ihrig <[email protected]> Reviewed-By: James M Snell <[email protected]> Reviewed-By: Trevor Norris <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,187 @@ | ||
| #ifndef SRC_NODE_MUTEX_H_ | ||
| #define SRC_NODE_MUTEX_H_ | ||
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| #include "util.h" | ||
| #include "uv.h" | ||
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| namespace node { | ||
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| template <typename Traits> class ConditionVariableBase; | ||
| template <typename Traits> class MutexBase; | ||
| struct LibuvMutexTraits; | ||
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| using ConditionVariable = ConditionVariableBase<LibuvMutexTraits>; | ||
| using Mutex = MutexBase<LibuvMutexTraits>; | ||
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| template <typename Traits> | ||
| class MutexBase { | ||
| public: | ||
| inline MutexBase(); | ||
| inline ~MutexBase(); | ||
| inline void Lock(); | ||
| inline void Unlock(); | ||
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| class ScopedLock; | ||
| class ScopedUnlock; | ||
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| class ScopedLock { | ||
| public: | ||
| inline explicit ScopedLock(const MutexBase& mutex); | ||
| inline explicit ScopedLock(const ScopedUnlock& scoped_unlock); | ||
| inline ~ScopedLock(); | ||
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| private: | ||
| template <typename> friend class ConditionVariableBase; | ||
| friend class ScopedUnlock; | ||
| const MutexBase& mutex_; | ||
| DISALLOW_COPY_AND_ASSIGN(ScopedLock); | ||
| }; | ||
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| class ScopedUnlock { | ||
| public: | ||
| inline explicit ScopedUnlock(const ScopedLock& scoped_lock); | ||
| inline ~ScopedUnlock(); | ||
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| private: | ||
| friend class ScopedLock; | ||
| const MutexBase& mutex_; | ||
| DISALLOW_COPY_AND_ASSIGN(ScopedUnlock); | ||
| }; | ||
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| private: | ||
| template <typename> friend class ConditionVariableBase; | ||
| mutable typename Traits::MutexT mutex_; | ||
| DISALLOW_COPY_AND_ASSIGN(MutexBase); | ||
| }; | ||
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| template <typename Traits> | ||
| class ConditionVariableBase { | ||
| public: | ||
| using ScopedLock = typename MutexBase<Traits>::ScopedLock; | ||
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| inline ConditionVariableBase(); | ||
| inline ~ConditionVariableBase(); | ||
| inline void Broadcast(const ScopedLock&); | ||
| inline void Signal(const ScopedLock&); | ||
| inline void Wait(const ScopedLock& scoped_lock); | ||
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| private: | ||
| typename Traits::CondT cond_; | ||
| DISALLOW_COPY_AND_ASSIGN(ConditionVariableBase); | ||
| }; | ||
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| struct LibuvMutexTraits { | ||
| using CondT = uv_cond_t; | ||
| using MutexT = uv_mutex_t; | ||
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| static inline int cond_init(CondT* cond) { | ||
| return uv_cond_init(cond); | ||
| } | ||
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| static inline int mutex_init(MutexT* mutex) { | ||
| return uv_mutex_init(mutex); | ||
| } | ||
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| static inline void cond_broadcast(CondT* cond) { | ||
| uv_cond_broadcast(cond); | ||
| } | ||
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| static inline void cond_destroy(CondT* cond) { | ||
| uv_cond_destroy(cond); | ||
| } | ||
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| static inline void cond_signal(CondT* cond) { | ||
| uv_cond_signal(cond); | ||
| } | ||
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| static inline void cond_wait(CondT* cond, MutexT* mutex) { | ||
| uv_cond_wait(cond, mutex); | ||
| } | ||
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| static inline void mutex_destroy(MutexT* mutex) { | ||
| uv_mutex_destroy(mutex); | ||
| } | ||
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| static inline void mutex_lock(MutexT* mutex) { | ||
| uv_mutex_lock(mutex); | ||
| } | ||
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| static inline void mutex_unlock(MutexT* mutex) { | ||
| uv_mutex_unlock(mutex); | ||
| } | ||
| }; | ||
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| template <typename Traits> | ||
| ConditionVariableBase<Traits>::ConditionVariableBase() { | ||
| CHECK_EQ(0, Traits::cond_init(&cond_)); | ||
| } | ||
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| template <typename Traits> | ||
| ConditionVariableBase<Traits>::~ConditionVariableBase() { | ||
| Traits::cond_destroy(&cond_); | ||
| } | ||
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| template <typename Traits> | ||
| void ConditionVariableBase<Traits>::Broadcast(const ScopedLock&) { | ||
| Traits::cond_broadcast(&cond_); | ||
| } | ||
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| template <typename Traits> | ||
| void ConditionVariableBase<Traits>::Signal(const ScopedLock&) { | ||
| Traits::cond_signal(&cond_); | ||
| } | ||
|
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| template <typename Traits> | ||
| void ConditionVariableBase<Traits>::Wait(const ScopedLock& scoped_lock) { | ||
| Traits::cond_wait(&cond_, &scoped_lock.mutex_.mutex_); | ||
| } | ||
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| template <typename Traits> | ||
| MutexBase<Traits>::MutexBase() { | ||
| CHECK_EQ(0, Traits::mutex_init(&mutex_)); | ||
| } | ||
|
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| template <typename Traits> | ||
| MutexBase<Traits>::~MutexBase() { | ||
| Traits::mutex_destroy(&mutex_); | ||
| } | ||
|
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| template <typename Traits> | ||
| void MutexBase<Traits>::Lock() { | ||
| Traits::mutex_lock(&mutex_); | ||
| } | ||
|
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| template <typename Traits> | ||
| void MutexBase<Traits>::Unlock() { | ||
| Traits::mutex_unlock(&mutex_); | ||
| } | ||
|
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| template <typename Traits> | ||
| MutexBase<Traits>::ScopedLock::ScopedLock(const MutexBase& mutex) | ||
| : mutex_(mutex) { | ||
| Traits::mutex_lock(&mutex_.mutex_); | ||
| } | ||
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| template <typename Traits> | ||
| MutexBase<Traits>::ScopedLock::ScopedLock(const ScopedUnlock& scoped_unlock) | ||
| : MutexBase(scoped_unlock.mutex_) {} | ||
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| template <typename Traits> | ||
| MutexBase<Traits>::ScopedLock::~ScopedLock() { | ||
| Traits::mutex_unlock(&mutex_.mutex_); | ||
| } | ||
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| template <typename Traits> | ||
| MutexBase<Traits>::ScopedUnlock::ScopedUnlock(const ScopedLock& scoped_lock) | ||
| : mutex_(scoped_lock.mutex_) { | ||
| Traits::mutex_unlock(&mutex_.mutex_); | ||
| } | ||
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| template <typename Traits> | ||
| MutexBase<Traits>::ScopedUnlock::~ScopedUnlock() { | ||
| Traits::mutex_lock(&mutex_.mutex_); | ||
| } | ||
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| } // namespace node | ||
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| #endif // SRC_NODE_MUTEX_H_ |