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https://github.com/Atmosphere-NX/Atmosphere.git
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146 lines
4 KiB
C++
146 lines
4 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 "dmnt2_htcs_receive_buffer.hpp"
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namespace ams::dmnt {
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ssize_t HtcsReceiveBuffer::Read(void *dst, size_t size) {
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/* Acquire exclusive access to ourselves. */
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std::scoped_lock lk(m_mutex);
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/* Check that we're readable and valid. */
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if (!(this->IsValid() && this->IsReadable())) {
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return -1;
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}
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/* Check that we have data to read. */
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const size_t readable = std::min(size, m_readable_size);
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if (readable <= 0) {
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return -1;
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}
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/* Copy the data. */
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std::memcpy(dst, m_buffer + m_offset, readable);
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/* Advance our pointers. */
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m_readable_size -= readable;
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m_offset += readable;
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/* Handle the case where we're done consuming. */
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if (m_readable_size == 0) {
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m_offset = 0;
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m_readable_event.Clear();
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m_writable_event.Signal();
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}
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return readable;
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}
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ssize_t HtcsReceiveBuffer::Write(const void *src, size_t size) {
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/* Acquire exclusive access to ourselves. */
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std::scoped_lock lk(m_mutex);
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/* Check that we're readable and valid. */
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if (!(this->IsValid() && this->IsWritable())) {
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return -1;
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}
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/* Copy the data to our buffer. */
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std::memcpy(m_buffer, src, size);
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/* Set our fields. */
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m_readable_size = size;
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m_offset = 0;
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m_writable_event.Clear();
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m_readable_event.Signal();
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return size;
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}
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bool HtcsReceiveBuffer::WaitToBeReadable() {
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/* Check if we're already readable. */
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{
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std::scoped_lock lk(m_mutex);
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if (this->IsReadable()) {
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return true;
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} else if (!this->IsValid()) {
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return false;
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} else {
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m_readable_event.Clear();
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}
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}
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/* Wait for us to be readable. */
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m_readable_event.Wait();
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return this->IsValid();
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}
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bool HtcsReceiveBuffer::WaitToBeReadable(TimeSpan timeout) {
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/* Check if we're already readable. */
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{
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std::scoped_lock lk(m_mutex);
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if (this->IsReadable()) {
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return true;
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} else if (!this->IsValid()) {
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return false;
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} else {
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m_readable_event.Clear();
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}
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}
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/* Wait for us to be readable. */
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const bool res = m_readable_event.TimedWait(timeout);
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return res && this->IsValid();
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}
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bool HtcsReceiveBuffer::WaitToBeWritable() {
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/* Check if we're already writable. */
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{
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std::scoped_lock lk(m_mutex);
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if (this->IsWritable()) {
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return true;
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} else if (!this->IsValid()) {
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return false;
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} else {
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m_writable_event.Clear();
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}
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}
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/* Wait for us to be writable. */
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m_writable_event.Wait();
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return this->IsValid();
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}
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void HtcsReceiveBuffer::Invalidate() {
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/* Acquire exclusive access to ourselves. */
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std::scoped_lock lk(m_mutex);
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/* Set ourselves as invalid. */
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m_valid = false;
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/* Signal our events. */
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m_readable_event.Signal();
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m_writable_event.Signal();
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}
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}
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