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.
101 lines
2.9 KiB
C++
101 lines
2.9 KiB
C++
/*
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* Copyright (c) 2018-2021, Andreas Kling <andreas@ladybird.org>
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* Copyright (c) 2021, kleines Filmröllchen <malu.bertsch@gmail.com>
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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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#include <AK/Assertions.h>
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#include <AK/Concepts.h>
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#include <AK/Diagnostics.h>
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#include <AK/Error.h>
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#include <AK/Format.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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#include <pthread.h>
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namespace Sync {
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namespace {
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ALWAYS_INLINE pthread_mutex_t* to_impl(void* ptr)
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{
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return reinterpret_cast<pthread_mutex_t*>(ptr);
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}
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}
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template<typename R, typename I>
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MutexBase<R, I>::~MutexBase()
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{
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int result = pthread_mutex_destroy(to_impl(m_storage));
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if (result != 0) {
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warnln("pthread_mutex_destroy failed with: {}", Error::from_errno(result));
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VERIFY_NOT_REACHED();
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}
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}
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template<typename R, typename I>
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bool MutexBase<R, I>::try_lock()
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{
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int result = pthread_mutex_trylock(to_impl(m_storage));
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if (result == 0)
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return true;
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if (result == EBUSY)
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return false;
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warnln("pthread_mutex_lock failed with: {}", Error::from_errno(result));
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VERIFY_NOT_REACHED();
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}
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template<typename R, typename I>
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void MutexBase<R, I>::lock()
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{
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int result = pthread_mutex_lock(to_impl(m_storage));
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if (result != 0) {
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warnln("pthread_mutex_lock failed with: {}", Error::from_errno(result));
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VERIFY_NOT_REACHED();
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}
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}
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template<typename R, typename I>
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void MutexBase<R, I>::unlock()
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{
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int result = pthread_mutex_unlock(to_impl(m_storage));
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if (result != 0) {
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warnln("pthread_mutex_unlock failed with: {}", Error::from_errno(result));
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VERIFY_NOT_REACHED();
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}
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}
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template<typename RecursivePolicy, typename InterprocessPolicy>
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MutexBase<RecursivePolicy, InterprocessPolicy>::MutexBase()
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{
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static_assert(sizeof(m_storage) == sizeof(pthread_mutex_t));
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pthread_mutex_t* mutex_ptr = new (m_storage) pthread_mutex_t;
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pthread_mutexattr_t attr;
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pthread_mutexattr_init(&attr);
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if constexpr (IsSame<RecursivePolicy, PolicyRecursive>) {
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pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);
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} else {
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pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_ERRORCHECK);
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}
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if constexpr (IsSame<InterprocessPolicy, PolicyInterprocess>)
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pthread_mutexattr_setpshared(&attr, PTHREAD_PROCESS_SHARED);
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int result = pthread_mutex_init(mutex_ptr, &attr);
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if (result != 0) {
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warnln("pthread_mutex_init failed with: {}", Error::from_errno(result));
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VERIFY_NOT_REACHED();
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}
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pthread_mutexattr_destroy(&attr);
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}
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template class SYNC_API MutexBase<PolicyNonRecursive, PolicyIntraprocess>;
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template class SYNC_API MutexBase<PolicyRecursive, PolicyIntraprocess>;
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template class SYNC_API MutexBase<PolicyNonRecursive, PolicyInterprocess>;
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template class SYNC_API MutexBase<PolicyRecursive, PolicyInterprocess>;
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}
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