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os: refactor MessageQueue to use new MessageQueueHelper template

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This commit is contained in:
Michael Scire 2021-09-29 12:24:18 -07:00
parent c7634c66c4
commit cf5f431058
4 changed files with 158 additions and 122 deletions
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117
libraries/libstratosphere/source/os/impl/os_message_queue_helper.hpp Normal file
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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/>.
*/
#pragma once
#include <stratosphere.hpp>
namespace ams::os::impl {
template<typename T>
concept IsMessageQueueType = requires(T &t) {
{ t.buffer } -> std::convertible_to<uintptr_t *>;
{ t.offset } -> std::convertible_to<s32>;
{ t.count } -> std::same_as<decltype(t.offset) &>;
{ t.capacity } -> std::same_as<decltype(t.count) &>;
};
template<typename T> requires IsMessageQueueType<T>
class MessageQueueHelper {
public:
static ALWAYS_INLINE bool IsMessageQueueFull(const T *mq) {
return mq->count >= mq->capacity;
}
static ALWAYS_INLINE bool IsMessageQueueEmpty(const T *mq) {
return mq->count == 0;
}
static void EnqueueUnsafe(T *mq, uintptr_t data) {
/* Ensure our limits are correct. */
auto count = mq->count;
const auto capacity = mq->capacity;
AMS_ASSERT(count < capacity);
/* Determine where we're writing. */
auto ind = mq->offset + count;
if (ind >= capacity) {
ind -= capacity;
}
AMS_ASSERT(0 <= ind && ind < capacity);
/* Write the data. */
mq->buffer[ind] = data;
++count;
/* Update tracking. */
mq->count = count;
}
static uintptr_t DequeueUnsafe(T *mq) {
/* Ensure our limits are correct. */
auto count = mq->count;
auto offset = mq->offset;
const auto capacity = mq->capacity;
AMS_ASSERT(count > 0);
AMS_ASSERT(offset >= 0 && offset < capacity);
/* Get the data. */
auto data = mq->buffer[offset++];
/* Calculate new tracking variables. */
if (offset >= capacity) {
offset -= capacity;
}
--count;
/* Update tracking. */
mq->offset = offset;
mq->count = count;
return data;
}
static void JamUnsafe(T *mq, uintptr_t data) {
/* Ensure our limits are correct. */
auto count = mq->count;
const auto capacity = mq->capacity;
AMS_ASSERT(count < capacity);
/* Determine where we're writing. */
auto offset = mq->offset - 1;
if (offset < 0) {
offset += capacity;
}
AMS_ASSERT(0 <= offset && offset < capacity);
/* Write the data. */
mq->buffer[offset] = data;
++count;
/* Update tracking. */
mq->offset = offset;
mq->count = count;
}
static uintptr_t PeekUnsafe(const T *mq) {
/* Ensure our limits are correct. */
const auto count = mq->count;
const auto offset = mq->offset;
AMS_ASSERT(count > 0);
return mq->buffer[offset];
}
};
}