Atmosphere/stratosphere/libstratosphere/source/os/os_message_queue.cpp
2019-12-07 12:41:28 -08:00

247 lines
7.5 KiB
C++

/*
* Copyright (c) 2018-2019 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 "impl/os_waitable_object_list.hpp"
namespace ams::os {
MessageQueue::MessageQueue(std::unique_ptr<uintptr_t[]> buf, size_t c): buffer(std::move(buf)), capacity(c), count(0), offset(0) {
new (GetPointer(this->waitlist_not_empty)) impl::WaitableObjectList();
new (GetPointer(this->waitlist_not_full)) impl::WaitableObjectList();
}
MessageQueue::~MessageQueue() {
GetReference(this->waitlist_not_empty).~WaitableObjectList();
GetReference(this->waitlist_not_full).~WaitableObjectList();
}
void MessageQueue::SendInternal(uintptr_t data) {
/* Ensure we don't corrupt the queue, but this should never happen. */
AMS_ASSERT(this->count < this->capacity);
/* Write data to tail of queue. */
this->buffer[(this->count++ + this->offset) % this->capacity] = data;
}
void MessageQueue::SendNextInternal(uintptr_t data) {
/* Ensure we don't corrupt the queue, but this should never happen. */
AMS_ASSERT(this->count < this->capacity);
/* Write data to head of queue. */
this->offset = (this->offset + this->capacity - 1) % this->capacity;
this->buffer[this->offset] = data;
this->count++;
}
uintptr_t MessageQueue::ReceiveInternal() {
/* Ensure we don't corrupt the queue, but this should never happen. */
AMS_ASSERT(this->count > 0);
uintptr_t data = this->buffer[this->offset];
this->offset = (this->offset + 1) % this->capacity;
this->count--;
return data;
}
inline uintptr_t MessageQueue::PeekInternal() {
/* Ensure we don't corrupt the queue, but this should never happen. */
AMS_ASSERT(this->count > 0);
return this->buffer[this->offset];
}
void MessageQueue::Send(uintptr_t data) {
/* Acquire mutex, wait sendable. */
std::scoped_lock lock(this->queue_lock);
while (this->IsFull()) {
this->cv_not_full.Wait(&this->queue_lock);
}
/* Send, signal. */
this->SendInternal(data);
this->cv_not_empty.Broadcast();
GetReference(this->waitlist_not_empty).SignalAllThreads();
}
bool MessageQueue::TrySend(uintptr_t data) {
std::scoped_lock lock(this->queue_lock);
if (this->IsFull()) {
return false;
}
/* Send, signal. */
this->SendInternal(data);
this->cv_not_empty.Broadcast();
GetReference(this->waitlist_not_empty).SignalAllThreads();
return true;
}
bool MessageQueue::TimedSend(uintptr_t data, u64 timeout) {
std::scoped_lock lock(this->queue_lock);
TimeoutHelper timeout_helper(timeout);
while (this->IsFull()) {
if (timeout_helper.TimedOut()) {
return false;
}
this->cv_not_full.TimedWait(&this->queue_lock, timeout_helper.NsUntilTimeout());
}
/* Send, signal. */
this->SendInternal(data);
this->cv_not_empty.Broadcast();
GetReference(this->waitlist_not_empty).SignalAllThreads();
return true;
}
void MessageQueue::SendNext(uintptr_t data) {
/* Acquire mutex, wait sendable. */
std::scoped_lock lock(this->queue_lock);
while (this->IsFull()) {
this->cv_not_full.Wait(&this->queue_lock);
}
/* Send, signal. */
this->SendNextInternal(data);
this->cv_not_empty.Broadcast();
GetReference(this->waitlist_not_empty).SignalAllThreads();
}
bool MessageQueue::TrySendNext(uintptr_t data) {
std::scoped_lock lock(this->queue_lock);
if (this->IsFull()) {
return false;
}
/* Send, signal. */
this->SendNextInternal(data);
this->cv_not_empty.Broadcast();
GetReference(this->waitlist_not_empty).SignalAllThreads();
return true;
}
bool MessageQueue::TimedSendNext(uintptr_t data, u64 timeout) {
std::scoped_lock lock(this->queue_lock);
TimeoutHelper timeout_helper(timeout);
while (this->IsFull()) {
if (timeout_helper.TimedOut()) {
return false;
}
this->cv_not_full.TimedWait(&this->queue_lock, timeout_helper.NsUntilTimeout());
}
/* Send, signal. */
this->SendNextInternal(data);
this->cv_not_empty.Broadcast();
GetReference(this->waitlist_not_empty).SignalAllThreads();
return true;
}
void MessageQueue::Receive(uintptr_t *out) {
/* Acquire mutex, wait receivable. */
std::scoped_lock lock(this->queue_lock);
while (this->IsEmpty()) {
this->cv_not_empty.Wait(&this->queue_lock);
}
/* Receive, signal. */
*out = this->ReceiveInternal();
this->cv_not_full.Broadcast();
GetReference(this->waitlist_not_full).SignalAllThreads();
}
bool MessageQueue::TryReceive(uintptr_t *out) {
/* Acquire mutex, wait receivable. */
std::scoped_lock lock(this->queue_lock);
if (this->IsEmpty()) {
return false;
}
/* Receive, signal. */
*out = this->ReceiveInternal();
this->cv_not_full.Broadcast();
GetReference(this->waitlist_not_full).SignalAllThreads();
return true;
}
bool MessageQueue::TimedReceive(uintptr_t *out, u64 timeout) {
std::scoped_lock lock(this->queue_lock);
TimeoutHelper timeout_helper(timeout);
while (this->IsEmpty()) {
if (timeout_helper.TimedOut()) {
return false;
}
this->cv_not_empty.TimedWait(&this->queue_lock, timeout_helper.NsUntilTimeout());
}
/* Receive, signal. */
*out = this->ReceiveInternal();
this->cv_not_full.Broadcast();
GetReference(this->waitlist_not_full).SignalAllThreads();
return true;
}
void MessageQueue::Peek(uintptr_t *out) {
/* Acquire mutex, wait receivable. */
std::scoped_lock lock(this->queue_lock);
while (this->IsEmpty()) {
this->cv_not_empty.Wait(&this->queue_lock);
}
/* Peek. */
*out = this->PeekInternal();
}
bool MessageQueue::TryPeek(uintptr_t *out) {
/* Acquire mutex, wait receivable. */
std::scoped_lock lock(this->queue_lock);
if (this->IsEmpty()) {
return false;
}
/* Peek. */
*out = this->PeekInternal();
return true;
}
bool MessageQueue::TimedPeek(uintptr_t *out, u64 timeout) {
std::scoped_lock lock(this->queue_lock);
TimeoutHelper timeout_helper(timeout);
while (this->IsEmpty()) {
if (timeout_helper.TimedOut()) {
return false;
}
this->cv_not_empty.TimedWait(&this->queue_lock, timeout_helper.NsUntilTimeout());
}
/* Peek. */
*out = this->PeekInternal();
return true;
}
}