[Code] Remove Attributions (#4988)

common/net/reliable_stream_pooling.h

@@ -0,0 +1,123 @@
+#pragma once
+
+#include <optional>
+#include <atomic>
+#include <memory>
+#include <array>
+#include <vector>
+#include <mutex>
+#include <iostream>
+#include "../eqemu_logsys.h"
+#include <uv.h>
+
+constexpr size_t UDP_BUFFER_SIZE = 512;
+
+struct EmbeddedContext {
+	size_t pool_index;
+	class SendBufferPool* pool;
+};
+
+class SendBufferPool {
+public:
+	explicit SendBufferPool(size_t initial_capacity = 64)
+		: m_capacity(initial_capacity), m_head(0)
+	{
+		LogNetClient("[SendBufferPool] Initializing with capacity [{}]", (int)m_capacity);
+
+		m_pool.reserve(m_capacity);
+		m_locks = std::make_unique<std::atomic_bool[]>(m_capacity);
+
+		for (size_t i = 0; i < m_capacity; ++i) {
+			auto* req = new PooledUdpSend();
+			req->context.pool_index = i;
+			req->context.pool = this;
+			req->uv_req.data = &req->context;
+
+			m_pool.emplace_back(std::unique_ptr<PooledUdpSend>(req));
+			m_locks[i].store(false, std::memory_order_relaxed);
+		}
+	}
+
+	std::optional<std::tuple<uv_udp_send_t*, char*, EmbeddedContext*>> acquire() {
+		size_t cap = m_capacity.load(std::memory_order_acquire);
+		for (size_t i = 0; i < cap; ++i) {
+			size_t index = m_head.fetch_add(1, std::memory_order_relaxed) % cap;
+			bool expected = false;
+			if (m_locks[index].compare_exchange_strong(expected, true)) {
+				auto* req = m_pool[index].get();
+				LogNetClientDetail("[SendBufferPool] Acquired [{}]", index);
+				return std::make_tuple(&req->uv_req, req->buffer.data(), &req->context);
+			}
+		}
+
+		LogNetClient("[SendBufferPool] Growing from [{}] to [{}]", cap, cap * 2);
+		grow();
+		return acquireAfterGrowth();
+	}
+
+	void release(EmbeddedContext* ctx) {
+		if (!ctx || ctx->pool != this || ctx->pool_index >= m_capacity.load(std::memory_order_acquire)) {
+			LogNetClient("[SendBufferPool] Invalid context release [{}]", ctx ? ctx->pool_index : -1);
+			return;
+		}
+		m_locks[ctx->pool_index].store(false, std::memory_order_release);
+		LogNetClientDetail("[SendBufferPool] Released [{}]", ctx->pool_index);
+	}
+
+private:
+	struct PooledUdpSend {
+		uv_udp_send_t                     uv_req;
+		std::array<char, UDP_BUFFER_SIZE> buffer;
+		EmbeddedContext                   context;
+	};
+
+	std::vector<std::unique_ptr<PooledUdpSend>> m_pool;
+	std::unique_ptr<std::atomic_bool[]> m_locks;
+	std::atomic<size_t> m_capacity;
+	std::atomic<size_t> m_head;
+	std::mutex m_grow_mutex;
+
+	void grow() {
+		std::lock_guard<std::mutex> lock(m_grow_mutex);
+
+		size_t old_cap = m_capacity.load(std::memory_order_acquire);
+		size_t new_cap = old_cap * 2;
+
+		m_pool.reserve(new_cap);
+		for (size_t i = old_cap; i < new_cap; ++i) {
+			auto* req = new PooledUdpSend();
+			req->context.pool_index = i;
+			req->context.pool = this;
+			req->uv_req.data = &req->context;
+
+			m_pool.emplace_back(std::unique_ptr<PooledUdpSend>(req));
+		}
+
+		auto new_locks = std::make_unique<std::atomic_bool[]>(new_cap);
+		for (size_t i = 0; i < old_cap; ++i) {
+			new_locks[i].store(m_locks[i].load(std::memory_order_acquire));
+		}
+		for (size_t i = old_cap; i < new_cap; ++i) {
+			new_locks[i].store(false, std::memory_order_relaxed);
+		}
+
+		m_locks = std::move(new_locks);
+		m_capacity.store(new_cap, std::memory_order_release);
+
+		LogNetClient("[SendBufferPool] Grew to [{}] from [{}]", new_cap, old_cap);
+	}
+
+	std::optional<std::tuple<uv_udp_send_t*, char*, EmbeddedContext*>> acquireAfterGrowth() {
+		size_t cap = m_capacity.load(std::memory_order_acquire);
+		for (size_t i = 0; i < cap; ++i) {
+			size_t index = m_head.fetch_add(1, std::memory_order_relaxed) % cap;
+			bool expected = false;
+			if (m_locks[index].compare_exchange_strong(expected, true)) {
+				auto* req = m_pool[index].get();
+				LogNetClient("[SendBufferPool] Acquired after grow [{}]", index);
+				return std::make_tuple(&req->uv_req, req->buffer.data(), &req->context);
+			}
+		}
+		return std::nullopt;
+	}
+};