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https://github.com/Atmosphere-NX/Atmosphere.git
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102 lines
4.3 KiB
C++
102 lines
4.3 KiB
C++
/*
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* Copyright (c) 2018-2020 Atmosphère-NX
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stratosphere.hpp>
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#include "impl/os_thread_manager.hpp"
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#include "impl/os_rw_lock_impl.hpp"
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namespace ams::os {
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void InitalizeReadWriteLock(ReadWriteLockType *rw_lock) {
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/* Create objects. */
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new (GetPointer(impl::GetLockCount(rw_lock).cs_storage)) impl::InternalCriticalSection;
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new (GetPointer(rw_lock->cv_read_lock._storage)) impl::InternalConditionVariable;
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new (GetPointer(rw_lock->cv_write_lock._storage)) impl::InternalConditionVariable;
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/* Set member variables. */
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impl::ClearReadLockCount(impl::GetLockCount(rw_lock));
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impl::ClearWriteLocked(impl::GetLockCount(rw_lock));
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impl::ClearReadLockWaiterCount(impl::GetLockCount(rw_lock));
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impl::ClearWriteLockWaiterCount(impl::GetLockCount(rw_lock));
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impl::ClearWriteLockCount(rw_lock);
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rw_lock->owner_thread = nullptr;
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/* Mark initialized. */
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rw_lock->state = ReadWriteLockType::State_Initialized;
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}
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void FinalizeReadWriteLock(ReadWriteLockType *rw_lock) {
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AMS_ASSERT(rw_lock->state == ReadWriteLockType::State_Initialized);
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/* Don't allow finalizing a locked lock. */
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AMS_ASSERT(impl::GetReadLockCount(impl::GetLockCount(rw_lock)) == 0);
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AMS_ASSERT(impl::GetWriteLocked(impl::GetLockCount(rw_lock)) == 0);
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/* Mark not initialized. */
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rw_lock->state = ReadWriteLockType::State_NotInitialized;
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/* Destroy objects. */
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GetReference(rw_lock->cv_write_lock._storage).~InternalConditionVariable();
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GetReference(rw_lock->cv_read_lock._storage).~InternalConditionVariable();
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GetReference(impl::GetLockCount(rw_lock).cs_storage).~InternalCriticalSection();
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}
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void AcquireReadLock(ReadWriteLockType *rw_lock) {
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AMS_ASSERT(rw_lock->state == ReadWriteLockType::State_Initialized);
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return impl::ReadWriteLockImpl::AcquireReadLock(rw_lock);
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}
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bool TryAcquireReadLock(ReadWriteLockType *rw_lock) {
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AMS_ASSERT(rw_lock->state == ReadWriteLockType::State_Initialized);
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return impl::ReadWriteLockImpl::TryAcquireReadLock(rw_lock);
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}
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void ReleaseReadLock(ReadWriteLockType *rw_lock) {
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AMS_ASSERT(rw_lock->state == ReadWriteLockType::State_Initialized);
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return impl::ReadWriteLockImpl::ReleaseReadLock(rw_lock);
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}
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void AcquireWriteLock(ReadWriteLockType *rw_lock) {
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AMS_ASSERT(rw_lock->state == ReadWriteLockType::State_Initialized);
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return impl::ReadWriteLockImpl::AcquireWriteLock(rw_lock);
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}
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bool TryAcquireWriteLock(ReadWriteLockType *rw_lock) {
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AMS_ASSERT(rw_lock->state == ReadWriteLockType::State_Initialized);
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return impl::ReadWriteLockImpl::TryAcquireWriteLock(rw_lock);
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}
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void ReleaseWriteLock(ReadWriteLockType *rw_lock) {
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AMS_ASSERT(rw_lock->state == ReadWriteLockType::State_Initialized);
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AMS_ABORT_UNLESS(rw_lock->owner_thread == impl::GetCurrentThread());
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return impl::ReadWriteLockImpl::ReleaseWriteLock(rw_lock);
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}
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bool IsReadLockHeld(const ReadWriteLockType *rw_lock) {
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AMS_ASSERT(rw_lock->state == ReadWriteLockType::State_Initialized);
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return impl::GetReadLockCount(impl::GetLockCount(rw_lock)) != 0;
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}
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bool IsWriteLockHeldByCurrentThread(const ReadWriteLockType *rw_lock) {
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AMS_ASSERT(rw_lock->state == ReadWriteLockType::State_Initialized);
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return rw_lock->owner_thread == impl::GetCurrentThread() && impl::GetWriteLockCount(*rw_lock) != 0;
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}
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bool IsReadWriteLockOwnerThread(const ReadWriteLockType *rw_lock) {
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AMS_ASSERT(rw_lock->state == ReadWriteLockType::State_Initialized);
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return rw_lock->owner_thread == impl::GetCurrentThread();
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}
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}
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