mirror of
https://github.com/Atmosphere-NX/Atmosphere
synced 2024-12-24 13:31:12 +00:00
143 lines
4.6 KiB
C++
143 lines
4.6 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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#if defined(ATMOSPHERE_IS_STRATOSPHERE)
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#include <stratosphere.hpp>
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#elif defined(ATMOSPHERE_IS_MESOSPHERE)
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#include <mesosphere.hpp>
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#elif defined(ATMOSPHERE_IS_EXOSPHERE)
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#include <exosphere.hpp>
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#else
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#include <vapours.hpp>
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#endif
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namespace ams::prfile2 {
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#if defined(AMS_PRFILE2_THREAD_SAFE)
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struct CriticalSection::Resource {
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os::MutexType mutex;
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bool in_use;
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};
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namespace {
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constexpr inline const auto NumCriticalSectionResources = 5 /* TODO: NumVolumes */;
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constinit os::SdkMutex g_crit_resource_mutex;
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constinit CriticalSection::Resource g_crit_resources[NumCriticalSectionResources];
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CriticalSection::Resource *AllocateCriticalSectionResource() {
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std::scoped_lock lk(g_crit_resource_mutex);
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for (auto &resource : g_crit_resources) {
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if (!resource.in_use) {
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resource.in_use = true;
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return std::addressof(resource);
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}
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}
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AMS_ABORT("Failed to allocate critical section resource");
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}
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void AcquireCriticalSectionResource(CriticalSection::Resource *resource) {
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return os::LockMutex(std::addressof(resource->mutex));
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}
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void ReleaseCriticalSectionResource(CriticalSection::Resource *resource) {
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return os::UnlockMutex(std::addressof(resource->mutex));
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}
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}
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void InitializeCriticalSection(CriticalSection *cs) {
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/* Check pre-condition. */
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AMS_ASSERT(cs->state == CriticalSection::State_NotInitialized);
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/* Perform initialization. */
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if (cs->state == CriticalSection::State_NotInitialized) {
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cs->resource = AllocateCriticalSectionResource();
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cs->owner = 0;
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cs->state = CriticalSection::State_Initialized;
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}
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}
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void FinalizeCriticalSection(CriticalSection *cs) {
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/* Check pre-condition. */
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AMS_ASSERT(cs->state == CriticalSection::State_Initialized);
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/* TODO */
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AMS_UNUSED(cs);
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AMS_ABORT("prfile2::FinalizeCriticalSection");
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}
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void EnterCriticalSection(CriticalSection *cs) {
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/* Check pre-condition. */
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AMS_ASSERT(cs->state == CriticalSection::State_Initialized);
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if (AMS_LIKELY(cs->lock_count == 0)) {
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/* Acquire the lock .*/
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AcquireCriticalSectionResource(cs->resource);
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system::GetCurrentContextId(std::addressof(cs->owner));
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} else {
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/* Get the current context id. */
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u64 current_context_id;
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system::GetCurrentContextId(std::addressof(current_context_id));
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/* If the lock isn't already held, acquire it. */
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if (cs->owner != current_context_id) {
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AcquireCriticalSectionResource(cs->resource);
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cs->owner = current_context_id;
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}
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}
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/* Increment the lock count. */
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++cs->lock_count;
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}
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void ExitCriticalSection(CriticalSection *cs) {
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/* Check pre-condition. */
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AMS_ASSERT(cs->state == CriticalSection::State_Initialized);
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/* Unlock. */
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if ((--cs->lock_count) == 0) {
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cs->owner = 0;
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ReleaseCriticalSectionResource(cs->resource);
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}
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}
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#else
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void InitializeCriticalSection(CriticalSection *cs) {
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AMS_UNUSED(cs);
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}
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void FinalizeCriticalSection(CriticalSection *cs) {
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AMS_UNUSED(cs);
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}
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void EnterCriticalSection(CriticalSection *cs) {
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AMS_UNUSED(cs);
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}
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void ExitCriticalSection(CriticalSection *cs) {
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AMS_UNUSED(cs);
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}
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#endif
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}
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