bounded_threadsafe_queue: Use simplified impl of bounded queue
Provides a simplified SPSC, MPSC, and MPMC bounded queue implementation using mutexes.
This commit is contained in:
Morph
parent
3d4c113037
commit
306840a580
2 changed files with 216 additions and 128 deletions
|
|
@ -1,159 +1,246 @@
|
|||
// SPDX-FileCopyrightText: Copyright (c) 2020 Erik Rigtorp <erik@rigtorp.se>
|
||||
// SPDX-License-Identifier: MIT
|
||||
// SPDX-FileCopyrightText: Copyright 2023 yuzu Emulator Project
|
||||
// SPDX-License-Identifier: GPL-2.0-or-later
|
||||
|
||||
#pragma once
|
||||
|
||||
#include <atomic>
|
||||
#include <bit>
|
||||
#include <condition_variable>
|
||||
#include <memory>
|
||||
#include <cstddef>
|
||||
#include <mutex>
|
||||
#include <new>
|
||||
#include <type_traits>
|
||||
#include <utility>
|
||||
|
||||
#include "common/polyfill_thread.h"
|
||||
|
||||
namespace Common {
|
||||
|
||||
#if defined(__cpp_lib_hardware_interference_size)
|
||||
constexpr size_t hardware_interference_size = std::hardware_destructive_interference_size;
|
||||
#else
|
||||
constexpr size_t hardware_interference_size = 64;
|
||||
#endif
|
||||
namespace detail {
|
||||
constexpr size_t DefaultCapacity = 0x1000;
|
||||
} // namespace detail
|
||||
|
||||
template <typename T, size_t Capacity = detail::DefaultCapacity>
|
||||
class SPSCQueue {
|
||||
static_assert((Capacity & (Capacity - 1)) == 0, "Capacity must be a power of two.");
|
||||
|
||||
template <typename T, size_t capacity = 0x400>
|
||||
class MPSCQueue {
|
||||
public:
|
||||
explicit MPSCQueue() : allocator{std::allocator<Slot<T>>()} {
|
||||
// Allocate one extra slot to prevent false sharing on the last slot
|
||||
slots = allocator.allocate(capacity + 1);
|
||||
// Allocators are not required to honor alignment for over-aligned types
|
||||
// (see http://eel.is/c++draft/allocator.requirements#10) so we verify
|
||||
// alignment here
|
||||
if (reinterpret_cast<uintptr_t>(slots) % alignof(Slot<T>) != 0) {
|
||||
allocator.deallocate(slots, capacity + 1);
|
||||
throw std::bad_alloc();
|
||||
}
|
||||
for (size_t i = 0; i < capacity; ++i) {
|
||||
std::construct_at(&slots[i]);
|
||||
}
|
||||
static_assert(std::has_single_bit(capacity), "capacity must be an integer power of 2");
|
||||
static_assert(alignof(Slot<T>) == hardware_interference_size,
|
||||
"Slot must be aligned to cache line boundary to prevent false sharing");
|
||||
static_assert(sizeof(Slot<T>) % hardware_interference_size == 0,
|
||||
"Slot size must be a multiple of cache line size to prevent "
|
||||
"false sharing between adjacent slots");
|
||||
static_assert(sizeof(MPSCQueue) % hardware_interference_size == 0,
|
||||
"Queue size must be a multiple of cache line size to "
|
||||
"prevent false sharing between adjacent queues");
|
||||
}
|
||||
void Push(T&& t) {
|
||||
const size_t write_index = m_write_index.load();
|
||||
|
||||
~MPSCQueue() noexcept {
|
||||
for (size_t i = 0; i < capacity; ++i) {
|
||||
std::destroy_at(&slots[i]);
|
||||
}
|
||||
allocator.deallocate(slots, capacity + 1);
|
||||
}
|
||||
|
||||
// The queue must be both non-copyable and non-movable
|
||||
MPSCQueue(const MPSCQueue&) = delete;
|
||||
MPSCQueue& operator=(const MPSCQueue&) = delete;
|
||||
|
||||
MPSCQueue(MPSCQueue&&) = delete;
|
||||
MPSCQueue& operator=(MPSCQueue&&) = delete;
|
||||
|
||||
void Push(const T& v) noexcept {
|
||||
static_assert(std::is_nothrow_copy_constructible_v<T>,
|
||||
"T must be nothrow copy constructible");
|
||||
emplace(v);
|
||||
}
|
||||
|
||||
template <typename P, typename = std::enable_if_t<std::is_nothrow_constructible_v<T, P&&>>>
|
||||
void Push(P&& v) noexcept {
|
||||
emplace(std::forward<P>(v));
|
||||
}
|
||||
|
||||
void Pop(T& v, std::stop_token stop) noexcept {
|
||||
auto const tail = tail_.fetch_add(1);
|
||||
auto& slot = slots[idx(tail)];
|
||||
if (!slot.turn.test()) {
|
||||
std::unique_lock lock{cv_mutex};
|
||||
Common::CondvarWait(cv, lock, stop, [&slot] { return slot.turn.test(); });
|
||||
}
|
||||
v = slot.move();
|
||||
slot.destroy();
|
||||
slot.turn.clear();
|
||||
slot.turn.notify_one();
|
||||
}
|
||||
|
||||
private:
|
||||
template <typename U = T>
|
||||
struct Slot {
|
||||
~Slot() noexcept {
|
||||
if (turn.test()) {
|
||||
destroy();
|
||||
}
|
||||
// Wait until we have free slots to write to.
|
||||
while ((write_index - m_read_index.load()) == Capacity) {
|
||||
std::this_thread::yield();
|
||||
}
|
||||
|
||||
template <typename... Args>
|
||||
void construct(Args&&... args) noexcept {
|
||||
static_assert(std::is_nothrow_constructible_v<U, Args&&...>,
|
||||
"T must be nothrow constructible with Args&&...");
|
||||
std::construct_at(reinterpret_cast<U*>(&storage), std::forward<Args>(args)...);
|
||||
}
|
||||
// Determine the position to write to.
|
||||
const size_t pos = write_index % Capacity;
|
||||
|
||||
void destroy() noexcept {
|
||||
static_assert(std::is_nothrow_destructible_v<U>, "T must be nothrow destructible");
|
||||
std::destroy_at(reinterpret_cast<U*>(&storage));
|
||||
}
|
||||
// Push into the queue.
|
||||
m_data[pos] = std::move(t);
|
||||
|
||||
U&& move() noexcept {
|
||||
return reinterpret_cast<U&&>(storage);
|
||||
}
|
||||
// Increment the write index.
|
||||
++m_write_index;
|
||||
|
||||
// Align to avoid false sharing between adjacent slots
|
||||
alignas(hardware_interference_size) std::atomic_flag turn{};
|
||||
struct aligned_store {
|
||||
struct type {
|
||||
alignas(U) unsigned char data[sizeof(U)];
|
||||
};
|
||||
};
|
||||
typename aligned_store::type storage;
|
||||
};
|
||||
|
||||
template <typename... Args>
|
||||
void emplace(Args&&... args) noexcept {
|
||||
static_assert(std::is_nothrow_constructible_v<T, Args&&...>,
|
||||
"T must be nothrow constructible with Args&&...");
|
||||
auto const head = head_.fetch_add(1);
|
||||
auto& slot = slots[idx(head)];
|
||||
slot.turn.wait(true);
|
||||
slot.construct(std::forward<Args>(args)...);
|
||||
slot.turn.test_and_set();
|
||||
// Notify the consumer that we have pushed into the queue.
|
||||
std::scoped_lock lock{cv_mutex};
|
||||
cv.notify_one();
|
||||
}
|
||||
|
||||
constexpr size_t idx(size_t i) const noexcept {
|
||||
return i & mask;
|
||||
template <typename... Args>
|
||||
void Push(Args&&... args) {
|
||||
const size_t write_index = m_write_index.load();
|
||||
|
||||
// Wait until we have free slots to write to.
|
||||
while ((write_index - m_read_index.load()) == Capacity) {
|
||||
std::this_thread::yield();
|
||||
}
|
||||
|
||||
// Determine the position to write to.
|
||||
const size_t pos = write_index % Capacity;
|
||||
|
||||
// Emplace into the queue.
|
||||
std::construct_at(std::addressof(m_data[pos]), std::forward<Args>(args)...);
|
||||
|
||||
// Increment the write index.
|
||||
++m_write_index;
|
||||
|
||||
// Notify the consumer that we have pushed into the queue.
|
||||
std::scoped_lock lock{cv_mutex};
|
||||
cv.notify_one();
|
||||
}
|
||||
|
||||
static constexpr size_t mask = capacity - 1;
|
||||
bool TryPop(T& t) {
|
||||
return Pop(t);
|
||||
}
|
||||
|
||||
// Align to avoid false sharing between head_ and tail_
|
||||
alignas(hardware_interference_size) std::atomic<size_t> head_{0};
|
||||
alignas(hardware_interference_size) std::atomic<size_t> tail_{0};
|
||||
void PopWait(T& t, std::stop_token stop_token) {
|
||||
Wait(stop_token);
|
||||
Pop(t);
|
||||
}
|
||||
|
||||
T PopWait(std::stop_token stop_token) {
|
||||
Wait(stop_token);
|
||||
T t;
|
||||
Pop(t);
|
||||
return t;
|
||||
}
|
||||
|
||||
void Clear() {
|
||||
while (!Empty()) {
|
||||
Pop();
|
||||
}
|
||||
}
|
||||
|
||||
bool Empty() const {
|
||||
return m_read_index.load() == m_write_index.load();
|
||||
}
|
||||
|
||||
size_t Size() const {
|
||||
return m_write_index.load() - m_read_index.load();
|
||||
}
|
||||
|
||||
private:
|
||||
void Pop() {
|
||||
const size_t read_index = m_read_index.load();
|
||||
|
||||
// Check if the queue is empty.
|
||||
if (read_index == m_write_index.load()) {
|
||||
return;
|
||||
}
|
||||
|
||||
// Determine the position to read from.
|
||||
const size_t pos = read_index % Capacity;
|
||||
|
||||
// Pop the data off the queue, deleting it.
|
||||
std::destroy_at(std::addressof(m_data[pos]));
|
||||
|
||||
// Increment the read index.
|
||||
++m_read_index;
|
||||
}
|
||||
|
||||
bool Pop(T& t) {
|
||||
const size_t read_index = m_read_index.load();
|
||||
|
||||
// Check if the queue is empty.
|
||||
if (read_index == m_write_index.load()) {
|
||||
return false;
|
||||
}
|
||||
|
||||
// Determine the position to read from.
|
||||
const size_t pos = read_index % Capacity;
|
||||
|
||||
// Pop the data off the queue, moving it.
|
||||
t = std::move(m_data[pos]);
|
||||
|
||||
// Increment the read index.
|
||||
++m_read_index;
|
||||
|
||||
return true;
|
||||
}
|
||||
|
||||
void Wait(std::stop_token stop_token) {
|
||||
std::unique_lock lock{cv_mutex};
|
||||
Common::CondvarWait(cv, lock, stop_token, [this] { return !Empty(); });
|
||||
}
|
||||
|
||||
alignas(128) std::atomic_size_t m_read_index{0};
|
||||
alignas(128) std::atomic_size_t m_write_index{0};
|
||||
|
||||
std::array<T, Capacity> m_data;
|
||||
|
||||
std::mutex cv_mutex;
|
||||
std::condition_variable_any cv;
|
||||
std::mutex cv_mutex;
|
||||
};
|
||||
|
||||
Slot<T>* slots;
|
||||
[[no_unique_address]] std::allocator<Slot<T>> allocator;
|
||||
template <typename T, size_t Capacity = detail::DefaultCapacity>
|
||||
class MPSCQueue {
|
||||
public:
|
||||
void Push(T&& t) {
|
||||
std::scoped_lock lock{write_mutex};
|
||||
spsc_queue.Push(std::move(t));
|
||||
}
|
||||
|
||||
static_assert(std::is_nothrow_copy_assignable_v<T> || std::is_nothrow_move_assignable_v<T>,
|
||||
"T must be nothrow copy or move assignable");
|
||||
template <typename... Args>
|
||||
void Push(Args&&... args) {
|
||||
std::scoped_lock lock{write_mutex};
|
||||
spsc_queue.Push(std::forward<Args>(args)...);
|
||||
}
|
||||
|
||||
static_assert(std::is_nothrow_destructible_v<T>, "T must be nothrow destructible");
|
||||
bool TryPop(T& t) {
|
||||
return spsc_queue.TryPop(t);
|
||||
}
|
||||
|
||||
void PopWait(T& t, std::stop_token stop_token) {
|
||||
spsc_queue.PopWait(t, stop_token);
|
||||
}
|
||||
|
||||
T PopWait(std::stop_token stop_token) {
|
||||
return spsc_queue.PopWait(stop_token);
|
||||
}
|
||||
|
||||
void Clear() {
|
||||
spsc_queue.Clear();
|
||||
}
|
||||
|
||||
bool Empty() {
|
||||
return spsc_queue.Empty();
|
||||
}
|
||||
|
||||
size_t Size() {
|
||||
return spsc_queue.Size();
|
||||
}
|
||||
|
||||
private:
|
||||
SPSCQueue<T, Capacity> spsc_queue;
|
||||
std::mutex write_mutex;
|
||||
};
|
||||
|
||||
template <typename T, size_t Capacity = detail::DefaultCapacity>
|
||||
class MPMCQueue {
|
||||
public:
|
||||
void Push(T&& t) {
|
||||
std::scoped_lock lock{write_mutex};
|
||||
spsc_queue.Push(std::move(t));
|
||||
}
|
||||
|
||||
template <typename... Args>
|
||||
void Push(Args&&... args) {
|
||||
std::scoped_lock lock{write_mutex};
|
||||
spsc_queue.Push(std::forward<Args>(args)...);
|
||||
}
|
||||
|
||||
bool TryPop(T& t) {
|
||||
std::scoped_lock lock{read_mutex};
|
||||
return spsc_queue.TryPop(t);
|
||||
}
|
||||
|
||||
void PopWait(T& t, std::stop_token stop_token) {
|
||||
std::scoped_lock lock{read_mutex};
|
||||
spsc_queue.PopWait(t, stop_token);
|
||||
}
|
||||
|
||||
T PopWait(std::stop_token stop_token) {
|
||||
std::scoped_lock lock{read_mutex};
|
||||
return spsc_queue.PopWait(stop_token);
|
||||
}
|
||||
|
||||
void Clear() {
|
||||
std::scoped_lock lock{read_mutex};
|
||||
spsc_queue.Clear();
|
||||
}
|
||||
|
||||
bool Empty() {
|
||||
std::scoped_lock lock{read_mutex};
|
||||
return spsc_queue.Empty();
|
||||
}
|
||||
|
||||
size_t Size() {
|
||||
std::scoped_lock lock{read_mutex};
|
||||
return spsc_queue.Size();
|
||||
}
|
||||
|
||||
private:
|
||||
SPSCQueue<T, Capacity> spsc_queue;
|
||||
std::mutex write_mutex;
|
||||
std::mutex read_mutex;
|
||||
};
|
||||
|
||||
} // namespace Common
|
||||
|
|
|
|||
|
|
@ -31,9 +31,10 @@ static void RunThread(std::stop_token stop_token, Core::System& system,
|
|||
auto current_context = context.Acquire();
|
||||
VideoCore::RasterizerInterface* const rasterizer = renderer.ReadRasterizer();
|
||||
|
||||
CommandDataContainer next;
|
||||
|
||||
while (!stop_token.stop_requested()) {
|
||||
CommandDataContainer next;
|
||||
state.queue.Pop(next, stop_token);
|
||||
state.queue.PopWait(next, stop_token);
|
||||
if (stop_token.stop_requested()) {
|
||||
break;
|
||||
}
|
||||
|
|
@ -117,7 +118,7 @@ u64 ThreadManager::PushCommand(CommandData&& command_data, bool block) {
|
|||
|
||||
std::unique_lock lk(state.write_lock);
|
||||
const u64 fence{++state.last_fence};
|
||||
state.queue.Push(CommandDataContainer(std::move(command_data), fence, block));
|
||||
state.queue.Push(std::move(command_data), fence, block);
|
||||
|
||||
if (block) {
|
||||
Common::CondvarWait(state.cv, lk, thread.get_stop_token(), [this, fence] {
|
||||
|
|
|
|||
Loading…
Reference in a new issue