mirror of
https://github.com/Atmosphere-NX/Atmosphere.git
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401 lines
13 KiB
C++
401 lines
13 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 "impl/os_waitable_object_list.hpp"
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#include "impl/os_timeout_helper.hpp"
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namespace ams::os {
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namespace {
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ALWAYS_INLINE bool IsMessageQueueFull(const MessageQueueType *mq) {
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return mq->count >= mq->capacity;
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}
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ALWAYS_INLINE bool IsMessageQueueEmpty(const MessageQueueType *mq) {
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return mq->count == 0;
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}
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void SendUnsafe(MessageQueueType *mq, uintptr_t data) {
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/* Ensure our limits are correct. */
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auto count = mq->count;
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auto capacity = mq->capacity;
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AMS_ASSERT(count < capacity);
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/* Determine where we're writing. */
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auto ind = mq->offset + count;
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if (ind >= capacity) {
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ind -= capacity;
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}
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AMS_ASSERT(0 <= ind && ind < capacity);
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/* Write the data. */
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mq->buffer[ind] = data;
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++count;
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/* Update tracking. */
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mq->count = count;
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}
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void SendNextUnsafe(MessageQueueType *mq, uintptr_t data) {
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/* Ensure our limits are correct. */
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auto count = mq->count;
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auto capacity = mq->capacity;
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AMS_ASSERT(count < capacity);
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/* Determine where we're writing. */
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auto offset = mq->offset - 1;
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if (offset < 0) {
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offset += capacity;
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}
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AMS_ASSERT(0 <= offset && offset < capacity);
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/* Write the data. */
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mq->buffer[offset] = data;
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++count;
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/* Update tracking. */
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mq->offset = offset;
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mq->count = count;
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}
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uintptr_t ReceiveUnsafe(MessageQueueType *mq) {
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/* Ensure our limits are correct. */
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auto count = mq->count;
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auto offset = mq->offset;
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auto capacity = mq->capacity;
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AMS_ASSERT(count > 0);
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AMS_ASSERT(offset >= 0 && offset < capacity);
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/* Get the data. */
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auto data = mq->buffer[offset];
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/* Calculate new tracking variables. */
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if ((++offset) >= capacity) {
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offset -= capacity;
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}
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--count;
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/* Update tracking. */
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mq->offset = offset;
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mq->count = count;
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return data;
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}
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uintptr_t PeekUnsafe(const MessageQueueType *mq) {
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/* Ensure our limits are correct. */
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auto count = mq->count;
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auto offset = mq->offset;
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AMS_ASSERT(count > 0);
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return mq->buffer[offset];
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}
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}
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void InitializeMessageQueue(MessageQueueType *mq, uintptr_t *buffer, size_t count) {
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AMS_ASSERT(buffer != nullptr);
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AMS_ASSERT(count >= 1);
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/* Setup objects. */
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new (GetPointer(mq->cs_queue)) impl::InternalCriticalSection;
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new (GetPointer(mq->cv_not_full)) impl::InternalConditionVariable;
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new (GetPointer(mq->cv_not_empty)) impl::InternalConditionVariable;
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/* Setup wait lists. */
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new (GetPointer(mq->waitlist_not_empty)) impl::WaitableObjectList;
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new (GetPointer(mq->waitlist_not_full)) impl::WaitableObjectList;
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/* Set member variables. */
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mq->buffer = buffer;
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mq->capacity = static_cast<s32>(count);
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mq->count = 0;
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mq->offset = 0;
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/* Mark initialized. */
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mq->state = MessageQueueType::State_Initialized;
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}
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void FinalizeMessageQueue(MessageQueueType *mq) {
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AMS_ASSERT(mq->state = MessageQueueType::State_Initialized);
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AMS_ASSERT(GetReference(mq->waitlist_not_empty).IsEmpty());
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AMS_ASSERT(GetReference(mq->waitlist_not_full).IsEmpty());
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/* Mark uninitialized. */
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mq->state = MessageQueueType::State_NotInitialized;
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/* Destroy wait lists. */
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GetReference(mq->waitlist_not_empty).~WaitableObjectList();
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GetReference(mq->waitlist_not_full).~WaitableObjectList();
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/* Destroy objects. */
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GetReference(mq->cv_not_empty).~InternalConditionVariable();
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GetReference(mq->cv_not_full).~InternalConditionVariable();
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GetReference(mq->cs_queue).~InternalCriticalSection();
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}
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/* Sending (FIFO functionality) */
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void SendMessageQueue(MessageQueueType *mq, uintptr_t data) {
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AMS_ASSERT(mq->state == MessageQueueType::State_Initialized);
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{
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/* Acquire mutex, wait sendable. */
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std::scoped_lock lk(GetReference(mq->cs_queue));
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while (IsMessageQueueFull(mq)) {
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GetReference(mq->cv_not_full).Wait(GetPointer(mq->cs_queue));
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}
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/* Send, signal. */
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SendUnsafe(mq, data);
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GetReference(mq->cv_not_empty).Broadcast();
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GetReference(mq->waitlist_not_empty).SignalAllThreads();
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}
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}
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bool TrySendMessageQueue(MessageQueueType *mq, uintptr_t data) {
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AMS_ASSERT(mq->state == MessageQueueType::State_Initialized);
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{
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/* Acquire mutex, check sendable. */
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std::scoped_lock lk(GetReference(mq->cs_queue));
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if (IsMessageQueueFull(mq)) {
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return false;
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}
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/* Send, signal. */
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SendUnsafe(mq, data);
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GetReference(mq->cv_not_empty).Broadcast();
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GetReference(mq->waitlist_not_empty).SignalAllThreads();
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}
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return true;
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}
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bool TimedSendMessageQueue(MessageQueueType *mq, uintptr_t data, TimeSpan timeout) {
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AMS_ASSERT(mq->state == MessageQueueType::State_Initialized);
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AMS_ASSERT(timeout.GetNanoSeconds() >= 0);
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{
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/* Acquire mutex, wait sendable. */
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impl::TimeoutHelper timeout_helper(timeout);
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std::scoped_lock lk(GetReference(mq->cs_queue));
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while (IsMessageQueueFull(mq)) {
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if (timeout_helper.TimedOut()) {
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return false;
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}
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GetReference(mq->cv_not_full).TimedWait(GetPointer(mq->cs_queue), timeout_helper);
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}
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/* Send, signal. */
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SendUnsafe(mq, data);
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GetReference(mq->cv_not_empty).Broadcast();
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GetReference(mq->waitlist_not_empty).SignalAllThreads();
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}
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return true;
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}
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/* Sending (LIFO functionality) */
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void SendNextMessageQueue(MessageQueueType *mq, uintptr_t data) {
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AMS_ASSERT(mq->state == MessageQueueType::State_Initialized);
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{
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/* Acquire mutex, wait sendable. */
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std::scoped_lock lk(GetReference(mq->cs_queue));
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while (IsMessageQueueFull(mq)) {
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GetReference(mq->cv_not_full).Wait(GetPointer(mq->cs_queue));
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}
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/* Send, signal. */
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SendNextUnsafe(mq, data);
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GetReference(mq->cv_not_empty).Broadcast();
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GetReference(mq->waitlist_not_empty).SignalAllThreads();
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}
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}
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bool TrySendNextMessageQueue(MessageQueueType *mq, uintptr_t data) {
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AMS_ASSERT(mq->state == MessageQueueType::State_Initialized);
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{
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/* Acquire mutex, check sendable. */
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std::scoped_lock lk(GetReference(mq->cs_queue));
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if (IsMessageQueueFull(mq)) {
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return false;
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}
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/* Send, signal. */
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SendNextUnsafe(mq, data);
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GetReference(mq->cv_not_empty).Broadcast();
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GetReference(mq->waitlist_not_empty).SignalAllThreads();
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}
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return true;
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}
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bool TimedSendNextMessageQueue(MessageQueueType *mq, uintptr_t data, TimeSpan timeout) {
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AMS_ASSERT(mq->state == MessageQueueType::State_Initialized);
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AMS_ASSERT(timeout.GetNanoSeconds() >= 0);
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{
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/* Acquire mutex, wait sendable. */
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impl::TimeoutHelper timeout_helper(timeout);
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std::scoped_lock lk(GetReference(mq->cs_queue));
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while (IsMessageQueueFull(mq)) {
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if (timeout_helper.TimedOut()) {
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return false;
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}
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GetReference(mq->cv_not_full).TimedWait(GetPointer(mq->cs_queue), timeout_helper);
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}
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/* Send, signal. */
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SendNextUnsafe(mq, data);
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GetReference(mq->cv_not_empty).Broadcast();
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GetReference(mq->waitlist_not_empty).SignalAllThreads();
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}
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return true;
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}
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/* Receive functionality */
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void ReceiveMessageQueue(uintptr_t *out, MessageQueueType *mq) {
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AMS_ASSERT(mq->state == MessageQueueType::State_Initialized);
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{
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/* Acquire mutex, wait receivable. */
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std::scoped_lock lk(GetReference(mq->cs_queue));
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while (IsMessageQueueEmpty(mq)) {
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GetReference(mq->cv_not_empty).Wait(GetPointer(mq->cs_queue));
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}
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/* Receive, signal. */
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*out = ReceiveUnsafe(mq);
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GetReference(mq->cv_not_full).Broadcast();
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GetReference(mq->waitlist_not_full).SignalAllThreads();
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}
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}
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bool TryReceiveMessageQueue(uintptr_t *out, MessageQueueType *mq) {
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AMS_ASSERT(mq->state == MessageQueueType::State_Initialized);
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{
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/* Acquire mutex, check receivable. */
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std::scoped_lock lk(GetReference(mq->cs_queue));
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if (IsMessageQueueEmpty(mq)) {
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return false;
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}
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/* Receive, signal. */
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*out = ReceiveUnsafe(mq);
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GetReference(mq->cv_not_full).Broadcast();
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GetReference(mq->waitlist_not_full).SignalAllThreads();
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}
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return true;
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}
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bool TimedReceiveMessageQueue(uintptr_t *out, MessageQueueType *mq, TimeSpan timeout) {
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AMS_ASSERT(mq->state == MessageQueueType::State_Initialized);
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AMS_ASSERT(timeout.GetNanoSeconds() >= 0);
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{
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/* Acquire mutex, wait receivable. */
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impl::TimeoutHelper timeout_helper(timeout);
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std::scoped_lock lk(GetReference(mq->cs_queue));
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while (IsMessageQueueEmpty(mq)) {
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if (timeout_helper.TimedOut()) {
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return false;
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}
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GetReference(mq->cv_not_empty).TimedWait(GetPointer(mq->cs_queue), timeout_helper);
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}
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/* Receive, signal. */
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*out = ReceiveUnsafe(mq);
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GetReference(mq->cv_not_full).Broadcast();
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GetReference(mq->waitlist_not_full).SignalAllThreads();
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}
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return true;
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}
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/* Peek functionality */
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void PeekMessageQueue(uintptr_t *out, const MessageQueueType *mq) {
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AMS_ASSERT(mq->state == MessageQueueType::State_Initialized);
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{
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/* Acquire mutex, wait receivable. */
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std::scoped_lock lk(GetReference(mq->cs_queue));
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while (IsMessageQueueEmpty(mq)) {
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GetReference(mq->cv_not_empty).Wait(GetPointer(mq->cs_queue));
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}
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/* Peek. */
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*out = PeekUnsafe(mq);
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}
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}
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bool TryPeekMessageQueue(uintptr_t *out, const MessageQueueType *mq) {
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AMS_ASSERT(mq->state == MessageQueueType::State_Initialized);
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{
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/* Acquire mutex, check receivable. */
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std::scoped_lock lk(GetReference(mq->cs_queue));
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if (IsMessageQueueEmpty(mq)) {
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return false;
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}
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/* Peek. */
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*out = PeekUnsafe(mq);
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}
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return true;
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}
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bool TimedPeekMessageQueue(uintptr_t *out, const MessageQueueType *mq, TimeSpan timeout) {
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AMS_ASSERT(mq->state == MessageQueueType::State_Initialized);
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AMS_ASSERT(timeout.GetNanoSeconds() >= 0);
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{
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/* Acquire mutex, wait receivable. */
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impl::TimeoutHelper timeout_helper(timeout);
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std::scoped_lock lk(GetReference(mq->cs_queue));
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while (IsMessageQueueEmpty(mq)) {
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if (timeout_helper.TimedOut()) {
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return false;
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}
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GetReference(mq->cv_not_empty).TimedWait(GetPointer(mq->cs_queue), timeout_helper);
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}
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/* Peek. */
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*out = PeekUnsafe(mq);
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}
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return true;
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}
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}
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