110 lines
3.6 KiB
C++
110 lines
3.6 KiB
C++
/***
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Copyright (C) 2021 J Reece Wilson (a/k/a "Reece"). All rights reserved.
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File: LockGuardTry.hpp
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Date: 2021-12-25
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Author: Reece
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***/
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#pragma once
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namespace Aurora::Threading
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{
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template<typename T>
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class TryLockGuard
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{
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private:
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using Internal_t = AuRemovePointer_t<T>;
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bool bLockSuccessful;
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public:
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TryLockGuard(T &lock)
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{
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if constexpr (AuIsPointer_v<T>)
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{
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annoying_ = lock;
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}
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else
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{
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annoying_ = &lock;
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}
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if constexpr (AuIsBaseOfTemplate<AURORA_RUNTIME_AU_SHARED_PTR, Internal_t>::value || AuIsBaseOfTemplate<AURORA_RUNTIME_AU_UNIQUE_PTR, Internal_t>::value)
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{
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bLockSuccessful = annoying_->get()->TryLock();
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}
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else
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{
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bLockSuccessful = annoying_->TryLock();
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}
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}
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TryLockGuard(T &&lock)
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{
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if constexpr (AuIsPointer_v<T>)
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{
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annoying_ = lock;
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}
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else
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{
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annoying_ = &lock;
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}
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if constexpr (AuIsBaseOfTemplate<AURORA_RUNTIME_AU_SHARED_PTR, Internal_t>::value || AuIsBaseOfTemplate<AURORA_RUNTIME_AU_UNIQUE_PTR, Internal_t>::value)
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{
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bLockSuccessful = annoying_->get()->TryLock();
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}
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else
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{
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bLockSuccessful = annoying_->TryLock();
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}
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}
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~TryLockGuard()
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{
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if (!bLockSuccessful)
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{
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return;
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}
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if constexpr (AuIsBaseOfTemplate<AURORA_RUNTIME_AU_SHARED_PTR, Internal_t>::value || AuIsBaseOfTemplate<AURORA_RUNTIME_AU_UNIQUE_PTR, Internal_t>::value)
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{
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annoying_->get()->Unlock();
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}
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else
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{
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annoying_->Unlock();
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}
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}
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const bool Locked() const
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{
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return bLockSuccessful;
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}
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private:
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std::conditional_t<AuIsPointer_v<T>, T, T*> annoying_;
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};
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// Named try-lock guard. Use when you wish to poll ::Locked(), otherwise use the auto-return macros
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// There is no point in using anonymous lock handles w/o checking the lock state or auto-returning
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// Where variable = an iwaitable-like interface reference, pointer, or shared pointer; value = reference to a boolean
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// name = name of handle variable
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#define AU_TRY_LOCK_GUARD_NAMED(variable, name) Aurora::Threading::TryLockGuard<decltype(variable)> name(variable);
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/// @hideinitializer
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#define AU_TRY_LOCK_GUARD_RET_NAMED(variable, value, name) AU_TRY_LOCK_GUARD_NAMED(variable, name) if (!(name.Locked())) return value;
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/// @hideinitializer
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#define AU_TRY_LOCK_GUARD_RET_COUNTERVAL(variable, value, counter) AU_TRY_LOCK_GUARD_RET_NAMED(variable, value, AU_CONCAT(__stack_lock, counter))
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// where variable = an iwaitable-like interface reference, pointer, or shared pointer; value = reference to a boolean
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// value = failure return object
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#define AU_TRY_LOCK_GUARD_RET_VAL(variable, value) AU_TRY_LOCK_GUARD_RET_COUNTERVAL(variable, value, AU_WHAT(__COUNTER__))
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// where variable = an iwaitable-like interface reference, pointer, or shared pointer
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#define AU_TRY_LOCK_GUARD_RET_DEF(variable) AU_TRY_LOCK_GUARD_RET_VAL(variable, {})
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// where variable = an iwaitable-like interface reference, pointer
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#define AU_TRY_LOCK_GUARD_RET(variable) AU_TRY_LOCK_GUARD_RET_VAL(variable, )
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} |