mirror of
https://github.com/Atmosphere-NX/Atmosphere.git
synced 2024-12-28 13:16:02 +00:00
228 lines
8.8 KiB
C++
228 lines
8.8 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 <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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m_num_sessions = 0;
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m_peak_sessions = 0;
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m_parent = parent;
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m_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 = m_num_sessions--;
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if (prev == m_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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bool KClientPort::IsServerClosed() const {
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return this->GetParent()->IsServerClosed();
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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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m_parent->OnClientClosed();
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/* Close our reference to our parent. */
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m_parent->Close();
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}
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bool KClientPort::IsSignaled() const {
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MESOSPHERE_ASSERT_THIS();
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return m_num_sessions < m_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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/* Declare the session we're going to allocate. */
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KSession *session;
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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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if (session_reservation.Succeeded()) {
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/* Allocate a session normally. */
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session = KSession::Create();
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} else {
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/* We couldn't reserve a session. Check that we support dynamically expanding the resource limit. */
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R_UNLESS(GetCurrentProcess().GetResourceLimit() == std::addressof(Kernel::GetSystemResourceLimit()), svc::ResultLimitReached());
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R_UNLESS(KTargetSystem::IsDynamicResourceLimitsEnabled(), svc::ResultLimitReached());
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/* Try to allocate a session from unused slab memory. */
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session = KSession::CreateFromUnusedSlabMemory();
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R_UNLESS(session != nullptr, svc::ResultLimitReached());
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/* Ensure that if we fail to allocate our session requests, we close the session we created. */
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auto session_guard = SCOPE_GUARD { session->Close(); };
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{
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/* We want to add two KSessionRequests to the heap, to prevent request exhaustion. */
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for (size_t i = 0; i < 2; ++i) {
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KSessionRequest *request = KSessionRequest::CreateFromUnusedSlabMemory();
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R_UNLESS(request != nullptr, svc::ResultLimitReached());
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request->Close();
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}
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}
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session_guard.Cancel();
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/* We successfully allocated a session, so add the object we allocated to the resource limit. */
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Kernel::GetSystemResourceLimit().Add(ams::svc::LimitableResource_SessionCountMax, 1);
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}
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/* Check that we successfully created a session. */
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R_UNLESS(session != nullptr, svc::ResultOutOfResource());
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/* Update the session counts. */
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auto count_guard = SCOPE_GUARD { session->Close(); };
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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 = m_max_sessions;
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auto cur_sessions = m_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 (!m_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 = m_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 (!m_peak_sessions.compare_exchange_weak(peak, new_sessions, std::memory_order_relaxed));
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}
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}
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count_guard.Cancel();
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/* Initialize the session. */
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session->Initialize(this, m_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(m_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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Result KClientPort::CreateLightSession(KLightClientSession **out) {
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MESOSPHERE_ASSERT_THIS();
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/* Declare the session we're going to allocate. */
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KLightSession *session;
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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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if (session_reservation.Succeeded()) {
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/* Allocate a session normally. */
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session = KLightSession::Create();
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} else {
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/* We couldn't reserve a session. Check that we support dynamically expanding the resource limit. */
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R_UNLESS(GetCurrentProcess().GetResourceLimit() == std::addressof(Kernel::GetSystemResourceLimit()), svc::ResultLimitReached());
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R_UNLESS(KTargetSystem::IsDynamicResourceLimitsEnabled(), svc::ResultLimitReached());
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/* Try to allocate a session from unused slab memory. */
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session = KLightSession::CreateFromUnusedSlabMemory();
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R_UNLESS(session != nullptr, svc::ResultLimitReached());
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/* We successfully allocated a session, so add the object we allocated to the resource limit. */
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Kernel::GetSystemResourceLimit().Add(ams::svc::LimitableResource_SessionCountMax, 1);
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}
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/* Check that we successfully created a session. */
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R_UNLESS(session != nullptr, svc::ResultOutOfResource());
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/* Update the session counts. */
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auto count_guard = SCOPE_GUARD { session->Close(); };
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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 = m_max_sessions;
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auto cur_sessions = m_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 (!m_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 = m_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 (!m_peak_sessions.compare_exchange_weak(peak, new_sessions, std::memory_order_relaxed));
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}
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}
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count_guard.Cancel();
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/* Initialize the session. */
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session->Initialize(this, m_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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KLightSession::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(m_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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