mirror of
https://github.com/LadybirdBrowser/ladybird
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50be9493d2
This commit adds in-place pimpl to abstract away the implementation of Mutex. It also adds policies to configure the type of mutex desired. Because of the tight integration between mutex and condition variables they also needed to be reworked and the changes have to be in one commit to retain atomicity. A win32 and pthread implemenation is provided to make sure the api works with both.
70 lines
1.8 KiB
C++
70 lines
1.8 KiB
C++
/*
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* Copyright (c) 2021, kleines Filmröllchen <filmroellchen@serenityos.org>.
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* Copyright (c) 2025, Ryszard Goc <ryszardgoc@gmail.com>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/Concepts.h>
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#include <AK/Function.h>
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#include <AK/Noncopyable.h>
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#include <AK/Platform.h>
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#include <LibSync/Export.h>
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#include <LibSync/Mutex.h>
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#include <LibSync/Policy.h>
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#if !defined(AK_OS_WINDOWS)
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# include <pthread.h>
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#endif
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namespace Sync {
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// A signaling condition variable that wraps over the platform APIs.
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// On posix it is a wrapper of pthread_cond_*.
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// On Windows it wraps ConditionVariable
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// TODO: Implement timed_wait()
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template<typename MutexType>
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requires Detail::IsIntraprocess<MutexType> && Detail::IsNonRecursive<MutexType>
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class SYNC_API ConditionVariableBase {
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AK_MAKE_NONCOPYABLE(ConditionVariableBase);
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AK_MAKE_NONMOVABLE(ConditionVariableBase);
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public:
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ConditionVariableBase(MutexType& to_wait_on);
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~ConditionVariableBase();
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// As with pthread APIs, the mutex must be locked or undefined behavior ensues.
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// Condition variables are allowed spurious wakeups. As such waiting on a condition in a loop is preferred.
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void wait();
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ALWAYS_INLINE void wait_while(Function<bool()> condition)
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{
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while (condition())
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wait();
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}
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// Release at least one of the threads waiting on this variable.
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void signal();
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// Release all of the threads waiting on this variable.
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void broadcast();
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private:
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#ifdef AK_OS_WINDOWS
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using StorageType = void*;
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#else
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using StorageType = pthread_cond_t;
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#endif
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alignas(StorageType) unsigned char m_storage[sizeof(StorageType)];
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MutexType& m_to_wait_on;
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};
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template<typename MutexType>
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ConditionVariableBase(MutexType&) -> ConditionVariableBase<MutexType>;
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using ConditionVariable = ConditionVariableBase<Mutex>;
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}
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