Atmosphere/libraries/libmesosphere/source/kern_k_light_server_session.cpp

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/*
* Copyright (c) 2018-2020 Atmosphère-NX
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <mesosphere.hpp>
namespace ams::kern {
void KLightServerSession::Destroy() {
MESOSPHERE_ASSERT_THIS();
this->CleanupRequests();
this->parent->OnServerClosed();
}
void KLightServerSession::OnClientClosed() {
MESOSPHERE_ASSERT_THIS();
this->CleanupRequests();
}
Result KLightServerSession::OnRequest(KThread *request_thread) {
MESOSPHERE_ASSERT_THIS();
MESOSPHERE_ASSERT(KScheduler::IsSchedulerLockedByCurrentThread());
/* Check that the server isn't closed. */
R_UNLESS(!this->parent->IsServerClosed(), svc::ResultSessionClosed());
/* Try to sleep the thread. */
R_UNLESS(this->request_queue.SleepThread(request_thread), svc::ResultTerminationRequested());
/* If we don't have a current request, wake up a server thread to handle it. */
if (this->current_request == nullptr) {
this->server_queue.WakeupFrontThread();
}
return ResultSuccess();
}
Result KLightServerSession::ReplyAndReceive(u32 *data) {
MESOSPHERE_ASSERT_THIS();
/* Set the server context. */
KThread *server_thread = GetCurrentThreadPointer();
server_thread->SetLightSessionData(data);
/* Reply, if we need to. */
KThread *cur_request = nullptr;
if (data[0] & KLightSession::ReplyFlag) {
KScopedSchedulerLock sl;
/* Check that we're open. */
R_UNLESS(!this->parent->IsClientClosed(), svc::ResultSessionClosed());
R_UNLESS(!this->parent->IsServerClosed(), svc::ResultSessionClosed());
/* Check that we have a request to reply to. */
R_UNLESS(this->current_request != nullptr, svc::ResultInvalidState());
/* Check that the server thread is correct. */
R_UNLESS(this->server_thread == server_thread, svc::ResultInvalidState());
/* If we can reply, do so. */
if (!this->current_request->IsTerminationRequested()) {
MESOSPHERE_ASSERT(this->current_request->GetState() == KThread::ThreadState_Waiting);
MESOSPHERE_ASSERT(this->current_request == this->request_queue.GetFront());
std::memcpy(this->current_request->GetLightSessionData(), server_thread->GetLightSessionData(), KLightSession::DataSize);
this->request_queue.WakeupThread(this->current_request);
}
/* Clear our current request. */
cur_request = this->current_request;
this->current_request = nullptr;
this->server_thread = nullptr;
}
/* Close the current request, if we had one. */
if (cur_request != nullptr) {
cur_request->Close();
}
/* Receive. */
bool set_cancellable = false;
while (true) {
KScopedSchedulerLock sl;
/* Check that we aren't already receiving. */
R_UNLESS(this->server_queue.IsEmpty(), svc::ResultInvalidState());
R_UNLESS(this->server_thread == nullptr, svc::ResultInvalidState());
/* If we cancelled in a previous loop, clear cancel state. */
if (set_cancellable) {
server_thread->ClearCancellable();
set_cancellable = false;
}
/* Check that we're open. */
R_UNLESS(!this->parent->IsClientClosed(), svc::ResultSessionClosed());
R_UNLESS(!this->parent->IsServerClosed(), svc::ResultSessionClosed());
/* If we have a request available, use it. */
if (this->current_request == nullptr && this->request_queue.IsEmpty()) {
this->current_request = this->request_queue.GetFront();
this->current_request->Open();
this->server_thread = server_thread;
} else {
/* Otherwise, wait for a request to come in. */
R_UNLESS(this->server_queue.SleepThread(server_thread), svc::ResultTerminationRequested());
/* Check if we were cancelled. */
if (server_thread->IsWaitCancelled()) {
this->server_queue.WakeupThread(server_thread);
server_thread->ClearWaitCancelled();
return svc::ResultCancelled();
}
/* Otherwise, mark as cancellable. */
server_thread->SetCancellable();
set_cancellable = true;
}
}
/* Copy the client data. */
std::memcpy(server_thread->GetLightSessionData(), this->current_request->GetLightSessionData(), KLightSession::DataSize);
}
void KLightServerSession::CleanupRequests() {
/* Cleanup all pending requests. */
KThread *cur_request = nullptr;
{
KScopedSchedulerLock sl;
/* Handle the current request. */
if (this->current_request != nullptr) {
/* Reply to the current request. */
if (!this->current_request->IsTerminationRequested()) {
MESOSPHERE_ASSERT(this->current_request->GetState() == KThread::ThreadState_Waiting);
MESOSPHERE_ASSERT(this->current_request == this->request_queue.GetFront());
this->request_queue.WakeupThread(this->current_request);
this->current_request->SetSyncedObject(nullptr, svc::ResultSessionClosed());
}
/* Clear our current request. */
cur_request = this->current_request;
this->current_request = nullptr;
this->server_thread = nullptr;
}
/* Reply to all other requests. */
while (!this->request_queue.IsEmpty()) {
KThread *client_thread = this->request_queue.WakeupFrontThread();
client_thread->SetSyncedObject(nullptr, svc::ResultSessionClosed());
}
/* Wake up all server threads. */
while (!this->server_queue.IsEmpty()) {
this->server_queue.WakeupFrontThread();
}
}
/* Close the current request, if we had one. */
if (cur_request != nullptr) {
cur_request->Close();
}
}
}