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https://git.eden-emu.dev/eden-emu/eden
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83a28dc251
for core stuff: just remove unique ptrs that dont need any pointer stability at all (afterall its an allocation within an allocation so yeah) for fibers: Main reasoning behind this is because virtualBuffer<> is stupidly fucking expensive and it also clutters my fstat view ALSO mmap is a syscall, syscalls are bad for performance or whatever ALSO std::vector<> is better suited for handling this kind of "fixed size thing where its like big but not THAT big" (512 KiB isn't going to kill your memory usage for each fiber...) for core.cpp stuff - inlines stuff into std::optional<> as opposed to std::unique_ptr<> (because yknow, we are making the Impl from an unique_ptr, allocating within an allocation is unnecessary) - reorganizes the structures a bit so padding doesnt screw us up (it's not perfect but eh saves a measly 44 bytes) - removes unused/dead code - uses std::vector<> instead of std::deque<> no perf impact expected, maybe some initialisation boost but very minimal impact nonethless lto gets rid of most calls anyways - the heavy issue is with shared_ptr and the cache coherency from the atomics... but i clumped them together because well, they kinda do not suffer from cache coherency - hopefully not a mistake this balloons the size of Impl to about 1.67 MB - which is fine because we throw it in the stack anyways REST OF INTERFACES: most of them ballooned in size as well, but overhead is ok since its an allocation within an alloc, no stack is used (when it comes to storing these i mean) Signed-off-by: lizzie lizzie@eden-emu.dev Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/3306 Reviewed-by: CamilleLaVey <camillelavey99@gmail.com> Reviewed-by: MaranBr <maranbr@eden-emu.dev> Co-authored-by: lizzie <lizzie@eden-emu.dev> Co-committed-by: lizzie <lizzie@eden-emu.dev>
58 lines
1.9 KiB
C++
58 lines
1.9 KiB
C++
// SPDX-FileCopyrightText: Copyright 2025 Eden Emulator Project
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// SPDX-License-Identifier: GPL-3.0-or-later
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// SPDX-FileCopyrightText: Copyright 2020 yuzu Emulator Project
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// SPDX-License-Identifier: GPL-2.0-or-later
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#pragma once
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#include <functional>
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#include <memory>
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namespace boost::context::detail {
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struct transfer_t;
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}
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namespace Common {
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/**
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* Fiber class
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* a fiber is a userspace thread with it's own context. They can be used to
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* implement coroutines, emulated threading systems and certain asynchronous
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* patterns.
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*
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* This class implements fibers at a low level, thus allowing greater freedom
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* to implement such patterns. This fiber class is 'threadsafe' only one fiber
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* can be running at a time and threads will be locked while trying to yield to
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* a running fiber until it yields. WARNING exchanging two running fibers between
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* threads will cause a deadlock. In order to prevent a deadlock, each thread should
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* have an intermediary fiber, you switch to the intermediary fiber of the current
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* thread and then from it switch to the expected fiber. This way you can exchange
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* 2 fibers within 2 different threads.
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*/
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class Fiber {
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public:
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Fiber(std::function<void()>&& entry_point_func);
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~Fiber();
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Fiber(const Fiber&) = delete;
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Fiber& operator=(const Fiber&) = delete;
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Fiber(Fiber&&) = default;
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Fiber& operator=(Fiber&&) = default;
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/// Yields control from Fiber 'from' to Fiber 'to'
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/// Fiber 'from' must be the currently running fiber.
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static void YieldTo(std::weak_ptr<Fiber> weak_from, Fiber& to);
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[[nodiscard]] static std::shared_ptr<Fiber> ThreadToFiber();
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void SetRewindPoint(std::function<void()>&& rewind_func);
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/// Only call from main thread's fiber
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void Exit();
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private:
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Fiber();
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void Start(boost::context::detail::transfer_t& transfer);
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struct FiberImpl;
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std::unique_ptr<FiberImpl> impl;
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};
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} // namespace Common
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