mirror of
https://github.com/Atmosphere-NX/Atmosphere
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127 lines
4.1 KiB
C++
127 lines
4.1 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 <mesosphere.hpp>
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namespace ams::kern {
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void KClientPort::Initialize(KPort *parent, s32 max_sessions) {
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/* Set member variables. */
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this->num_sessions = 0;
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this->peak_sessions = 0;
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this->parent = parent;
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this->max_sessions = max_sessions;
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}
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void KClientPort::OnSessionFinalized() {
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KScopedSchedulerLock sl;
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const auto prev = this->num_sessions--;
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if (prev == this->max_sessions) {
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this->NotifyAvailable();
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}
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}
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void KClientPort::OnServerClosed() {
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MESOSPHERE_ASSERT_THIS();
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}
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bool KClientPort::IsLight() const {
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return this->GetParent()->IsLight();
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}
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void KClientPort::Destroy() {
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/* Note with our parent that we're closed. */
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this->parent->OnClientClosed();
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/* Close our reference to our parent. */
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this->parent->Close();
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}
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bool KClientPort::IsSignaled() const {
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/* TODO: Check preconditions later. */
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MESOSPHERE_ASSERT_THIS();
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return this->num_sessions < this->max_sessions;
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}
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Result KClientPort::CreateSession(KClientSession **out) {
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MESOSPHERE_ASSERT_THIS();
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/* Reserve a new session from the resource limit. */
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KScopedResourceReservation session_reservation(GetCurrentProcessPointer(), ams::svc::LimitableResource_SessionCountMax);
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R_UNLESS(session_reservation.Succeeded(), svc::ResultLimitReached());
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/* Update the session counts. */
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{
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/* Atomically increment the number of sessions. */
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s32 new_sessions;
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{
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const auto max = this->max_sessions;
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auto cur_sessions = this->num_sessions.load(std::memory_order_acquire);
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do {
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R_UNLESS(cur_sessions < max, svc::ResultOutOfSessions());
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new_sessions = cur_sessions + 1;
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} while (!this->num_sessions.compare_exchange_weak(cur_sessions, new_sessions, std::memory_order_relaxed));
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}
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/* Atomically update the peak session tracking. */
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{
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auto peak = this->peak_sessions.load(std::memory_order_acquire);
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do {
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if (peak >= new_sessions) {
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break;
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}
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} while (!this->peak_sessions.compare_exchange_weak(peak, new_sessions, std::memory_order_relaxed));
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}
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}
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/* Create a new session. */
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KSession *session = KSession::Create();
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if (session == nullptr) {
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/* Decrement the session count. */
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const auto prev = this->num_sessions--;
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if (prev == this->max_sessions) {
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this->NotifyAvailable();
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}
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return svc::ResultOutOfResource();
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}
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/* Initialize the session. */
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session->Initialize(this, this->parent->GetName());
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/* Commit the session reservation. */
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session_reservation.Commit();
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/* Register the session. */
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KSession::Register(session);
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auto session_guard = SCOPE_GUARD {
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session->GetClientSession().Close();
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session->GetServerSession().Close();
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};
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/* Enqueue the session with our parent. */
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R_TRY(this->parent->EnqueueSession(std::addressof(session->GetServerSession())));
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/* We succeeded, so set the output. */
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session_guard.Cancel();
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*out = std::addressof(session->GetClientSession());
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return ResultSuccess();
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}
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}
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