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// SPDX-FileCopyrightText: 2021 Citra Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later
#include "common/scope_exit.h"
#include "core/hle/kernel/k_client_port.h"
#include "core/hle/kernel/k_port.h"
#include "core/hle/kernel/k_scheduler.h"
#include "core/hle/kernel/k_scoped_resource_reservation.h"
#include "core/hle/kernel/k_session.h"
#include "core/hle/kernel/svc_results.h"
namespace Kernel {
KClientPort::KClientPort(KernelCore& kernel_) : KSynchronizationObject{kernel_} {}
KClientPort::~KClientPort() = default;
void KClientPort::Initialize(KPort* parent, s32 max_sessions) {
// Set member variables.
m_num_sessions = 0;
m_peak_sessions = 0;
m_parent = parent;
m_max_sessions = max_sessions;
}
void KClientPort::OnSessionFinalized() {
KScopedSchedulerLock sl{kernel};
if (const auto prev = m_num_sessions--; prev == m_max_sessions) {
this->NotifyAvailable();
}
}
void KClientPort::OnServerClosed() {}
bool KClientPort::IsLight() const {
return this->GetParent()->IsLight();
}
bool KClientPort::IsServerClosed() const {
return this->GetParent()->IsServerClosed();
}
void KClientPort::Destroy() {
// Note with our parent that we're closed.
m_parent->OnClientClosed();
// Close our reference to our parent.
m_parent->Close();
}
bool KClientPort::IsSignaled() const {
return m_num_sessions.load() < m_max_sessions;
}
Result KClientPort::CreateSession(KClientSession** out) {
// Declare the session we're going to allocate.
KSession* session{};
// Reserve a new session from the resource limit.
//! FIXME: we are reserving this from the wrong resource limit!
KScopedResourceReservation session_reservation(kernel.ApplicationProcess()->GetResourceLimit(),
LimitableResource::SessionCountMax);
R_UNLESS(session_reservation.Succeeded(), ResultLimitReached);
// Allocate a session normally.
session = KSession::Create(kernel);
// Check that we successfully created a session.
R_UNLESS(session != nullptr, ResultOutOfResource);
// Update the session counts.
{
ON_RESULT_FAILURE {
session->Close();
};
// Atomically increment the number of sessions.
s32 new_sessions{};
{
const auto max = m_max_sessions;
auto cur_sessions = m_num_sessions.load(std::memory_order_acquire);
do {
R_UNLESS(cur_sessions < max, ResultOutOfSessions);
new_sessions = cur_sessions + 1;
} while (!m_num_sessions.compare_exchange_weak(cur_sessions, new_sessions,
std::memory_order_relaxed));
}
// Atomically update the peak session tracking.
{
auto peak = m_peak_sessions.load(std::memory_order_acquire);
do {
if (peak >= new_sessions) {
break;
}
} while (!m_peak_sessions.compare_exchange_weak(peak, new_sessions,
std::memory_order_relaxed));
}
}
// Initialize the session.
session->Initialize(this, m_parent->GetName());
// Commit the session reservation.
session_reservation.Commit();
// Register the session.
KSession::Register(kernel, session);
ON_RESULT_FAILURE {
session->GetClientSession().Close();
session->GetServerSession().Close();
};
// Enqueue the session with our parent.
R_TRY(m_parent->EnqueueSession(std::addressof(session->GetServerSession())));
// We succeeded, so set the output.
*out = std::addressof(session->GetClientSession());
R_SUCCEED();
}
} // namespace Kernel
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