mirror of
https://github.com/Atmosphere-NX/Atmosphere-libs.git
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98 lines
3.7 KiB
C++
98 lines
3.7 KiB
C++
/*
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* Copyright (c) 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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#if !defined(AMS_OS_INTERNAL_CRITICAL_SECTION_IMPL_CAN_CHECK_LOCKED_BY_CURRENT_THREAD)
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#include "impl/os_thread_manager.hpp"
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#endif
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namespace ams::os {
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void InitializeSdkRecursiveMutex(SdkRecursiveMutexType *rmutex) {
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/* Initialize the critical section. */
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GetReference(rmutex->_storage).Initialize();
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/* Set recursive count. */
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rmutex->recursive_count = 0;
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/* If the underlying critical section can't readily be checked, set owner thread. */
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#if !defined(AMS_OS_INTERNAL_CRITICAL_SECTION_IMPL_CAN_CHECK_LOCKED_BY_CURRENT_THREAD)
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rmutex->owner_thread = nullptr;
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#endif
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}
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bool IsSdkRecursiveMutexLockedByCurrentThread(const SdkRecursiveMutexType *rmutex) {
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#if defined(AMS_OS_INTERNAL_CRITICAL_SECTION_IMPL_CAN_CHECK_LOCKED_BY_CURRENT_THREAD)
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/* Check whether the critical section is held. */
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return GetReference(rmutex->_storage).IsLockedByCurrentThread();
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#else
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/* Check if the current thread is owner. */
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return rmutex->owner_thread == os::impl::GetCurrentThread();
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#endif
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}
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void LockSdkRecursiveMutex(SdkRecursiveMutexType *rmutex) {
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/* If we don't hold the mutex, enter the critical section. */
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if (!IsSdkRecursiveMutexLockedByCurrentThread(rmutex)) {
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GetReference(rmutex->_storage).Enter();
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/* If necessary, set owner thread. */
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#if !defined(AMS_OS_INTERNAL_CRITICAL_SECTION_IMPL_CAN_CHECK_LOCKED_BY_CURRENT_THREAD)
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rmutex->owner_thread = os::impl::GetCurrentThread();
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#endif
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}
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/* Increment (and check) recursive count. */
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++rmutex->recursive_count;
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AMS_ABORT_UNLESS(rmutex->recursive_count != 0);
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}
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bool TryLockSdkRecursiveMutex(SdkRecursiveMutexType *rmutex) {
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/* If we don't hold the mutex, try to enter the critical section. */
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if (!IsSdkRecursiveMutexLockedByCurrentThread(rmutex)) {
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if (!GetReference(rmutex->_storage).TryEnter()) {
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return false;
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}
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/* If necessary, set owner thread. */
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#if !defined(AMS_OS_INTERNAL_CRITICAL_SECTION_IMPL_CAN_CHECK_LOCKED_BY_CURRENT_THREAD)
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rmutex->owner_thread = os::impl::GetCurrentThread();
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#endif
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}
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/* Increment (and check) recursive count. */
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++rmutex->recursive_count;
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AMS_ABORT_UNLESS(rmutex->recursive_count != 0);
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return true;
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}
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void UnlockSdkRecursiveMutex(SdkRecursiveMutexType *rmutex) {
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/* Check pre-conditions. */
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AMS_ABORT_UNLESS(IsSdkRecursiveMutexLockedByCurrentThread(rmutex));
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/* Decrement recursive count, and leave critical section if we no longer hold the mutex. */
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if ((--rmutex->recursive_count) == 0) {
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/* If necessary, clear owner thread. */
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#if !defined(AMS_OS_INTERNAL_CRITICAL_SECTION_IMPL_CAN_CHECK_LOCKED_BY_CURRENT_THREAD)
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rmutex->owner_thread = nullptr;
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#endif
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GetReference(rmutex->_storage).Leave();
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}
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}
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}
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