mirror of
https://github.com/Atmosphere-NX/Atmosphere.git
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146 lines
4.2 KiB
C++
146 lines
4.2 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_waitable_object_list.hpp"
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#include "impl/os_timeout_helper.hpp"
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namespace ams::os {
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void InitializeSemaphore(SemaphoreType *sema, s32 count, s32 max_count) {
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AMS_ASSERT(max_count >= 1);
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AMS_ASSERT(count >= 0);
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/* Setup objects. */
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util::ConstructAt(sema->cs_sema);
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util::ConstructAt(sema->cv_not_zero);
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/* Setup wait lists. */
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util::ConstructAt(sema->waitlist);
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/* Set member variables. */
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sema->count = count;
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sema->max_count = max_count;
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/* Mark initialized. */
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sema->state = SemaphoreType::State_Initialized;
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}
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void FinalizeSemaphore(SemaphoreType *sema) {
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AMS_ASSERT(sema->state = SemaphoreType::State_Initialized);
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AMS_ASSERT(GetReference(sema->waitlist).IsEmpty());
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/* Mark uninitialized. */
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sema->state = SemaphoreType::State_NotInitialized;
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/* Destroy wait lists. */
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util::DestroyAt(sema->waitlist);
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/* Destroy objects. */
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util::DestroyAt(sema->cv_not_zero);
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util::DestroyAt(sema->cs_sema);
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}
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void AcquireSemaphore(SemaphoreType *sema) {
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AMS_ASSERT(sema->state == SemaphoreType::State_Initialized);
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{
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std::scoped_lock lk(GetReference(sema->cs_sema));
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while (sema->count == 0) {
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GetReference(sema->cv_not_zero).Wait(GetPointer(sema->cs_sema));
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}
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--sema->count;
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}
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}
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bool TryAcquireSemaphore(SemaphoreType *sema) {
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AMS_ASSERT(sema->state == SemaphoreType::State_Initialized);
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{
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std::scoped_lock lk(GetReference(sema->cs_sema));
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if (sema->count == 0) {
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return false;
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}
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--sema->count;
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}
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return true;
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}
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bool TimedAcquireSemaphore(SemaphoreType *sema, TimeSpan timeout) {
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AMS_ASSERT(sema->state == SemaphoreType::State_Initialized);
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AMS_ASSERT(timeout.GetNanoSeconds() >= 0);
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{
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impl::TimeoutHelper timeout_helper(timeout);
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std::scoped_lock lk(GetReference(sema->cs_sema));
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while (sema->count == 0) {
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if (timeout_helper.TimedOut()) {
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return false;
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}
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GetReference(sema->cv_not_zero).TimedWait(GetPointer(sema->cs_sema), timeout_helper);
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}
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--sema->count;
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}
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return true;
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}
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void ReleaseSemaphore(SemaphoreType *sema) {
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AMS_ASSERT(sema->state == SemaphoreType::State_Initialized);
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{
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std::scoped_lock lk(GetReference(sema->cs_sema));
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AMS_ASSERT(sema->count + 1 <= sema->max_count);
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++sema->count;
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GetReference(sema->cv_not_zero).Signal();
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GetReference(sema->waitlist).SignalAllThreads();
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}
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}
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void ReleaseSemaphore(SemaphoreType *sema, s32 count) {
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AMS_ASSERT(sema->state == SemaphoreType::State_Initialized);
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{
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std::scoped_lock lk(GetReference(sema->cs_sema));
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AMS_ASSERT(sema->count + count <= sema->max_count);
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sema->count += count;
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GetReference(sema->cv_not_zero).Signal();
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GetReference(sema->waitlist).SignalAllThreads();
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}
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}
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s32 GetCurrentSemaphoreCount(const SemaphoreType *sema) {
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AMS_ASSERT(sema->state == SemaphoreType::State_Initialized);
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return sema->count;
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}
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// void InitializeWaitableHolder(WaitableHolderType *waitable_holder, SemaphoreType *sema);
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}
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