mirror of
https://github.com/Atmosphere-NX/Atmosphere
synced 2024-12-05 15:59:11 +00:00
160 lines
4.7 KiB
C++
160 lines
4.7 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_mutex_impl.hpp"
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namespace ams::os {
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namespace impl {
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#ifdef ATMOSPHERE_BUILD_FOR_AUDITING
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void PushAndCheckLockLevel(MutexType *mutex) {
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/* If auditing isn't specified, don't bother. */
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if (mutex->lock_level == 0) {
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return;
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}
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/* TODO: Implement mutex level auditing. */
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}
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void PopAndCheckLockLevel(MutexType *mutex) {
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/* If auditing isn't specified, don't bother. */
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if (mutex->lock_level == 0) {
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return;
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}
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/* TODO: Implement mutex level auditing. */
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}
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#else
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void PushAndCheckLockLevel(MutexType *mutex) {
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/* ... */
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}
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void PopAndCheckLockLevel(MutexType *mutex) {
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/* ... */
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}
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#endif
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}
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namespace {
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ALWAYS_INLINE void AfterLockMutex(MutexType *mutex, ThreadType *cur_thread) {
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AMS_ASSERT(mutex->nest_count < MutexRecursiveLockCountMax);
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impl::PushAndCheckLockLevel(mutex);
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++mutex->nest_count;
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mutex->owner_thread = cur_thread;
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}
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}
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void InitializeMutex(MutexType *mutex, bool recursive, int lock_level) {
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AMS_ASSERT((lock_level == 0) || (MutexLockLevelMin <= lock_level && lock_level <= MutexLockLevelMax));
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/* Create object. */
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new (GetPointer(mutex->_storage)) impl::InternalCriticalSection;
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/* Set member variables. */
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mutex->is_recursive = recursive;
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mutex->lock_level = lock_level;
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mutex->nest_count = 0;
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mutex->owner_thread = nullptr;
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/* Mark initialized. */
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mutex->state = MutexType::State_Initialized;
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}
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void FinalizeMutex(MutexType *mutex) {
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AMS_ASSERT(mutex->state == MutexType::State_Initialized);
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/* Mark not intialized. */
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mutex->state = MutexType::State_NotInitialized;
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/* Destroy object. */
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GetReference(mutex->_storage).~InternalCriticalSection();
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}
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void LockMutex(MutexType *mutex) {
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AMS_ASSERT(mutex->state == MutexType::State_Initialized);
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ThreadType *current = impl::GetCurrentThread();
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if (!mutex->is_recursive) {
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AMS_ASSERT(mutex->owner_thread != current);
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GetReference(mutex->_storage).Enter();
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} else {
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if (mutex->owner_thread == current) {
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AMS_ASSERT(mutex->nest_count >= 1);
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} else {
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GetReference(mutex->_storage).Enter();
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}
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}
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AfterLockMutex(mutex, current);
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}
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bool TryLockMutex(MutexType *mutex) {
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AMS_ASSERT(mutex->state == MutexType::State_Initialized);
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ThreadType *current = impl::GetCurrentThread();
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if (!mutex->is_recursive) {
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AMS_ASSERT(mutex->owner_thread != current);
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if (!GetReference(mutex->_storage).TryEnter()) {
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return false;
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}
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} else {
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if (mutex->owner_thread == current) {
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AMS_ASSERT(mutex->nest_count >= 1);
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} else {
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if (!GetReference(mutex->_storage).TryEnter()) {
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return false;
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}
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}
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}
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AfterLockMutex(mutex, current);
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return true;
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}
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void UnlockMutex(MutexType *mutex) {
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AMS_ASSERT(mutex->state == MutexType::State_Initialized);
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AMS_ASSERT(mutex->nest_count > 0);
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AMS_ASSERT(mutex->owner_thread == impl::GetCurrentThread());
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impl::PopAndCheckLockLevel(mutex);
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if ((--mutex->nest_count) == 0) {
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mutex->owner_thread = nullptr;
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GetReference(mutex->_storage).Leave();
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}
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}
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bool IsMutexLockedByCurrentThread(const MutexType *mutex) {
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AMS_ASSERT(mutex->state == MutexType::State_Initialized);
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return mutex->owner_thread == impl::GetCurrentThread();
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}
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}
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