From ed0319cfed2c99e6366aaf725d96bb28a9332e4d Mon Sep 17 00:00:00 2001
From: Liam <byteslice@airmail.cc>
Date: Sat, 2 Jul 2022 12:33:49 -0400
Subject: common/fiber: make fibers easier to use

---
 src/common/fiber.cpp | 21 ++++++---------------
 src/common/fiber.h   |  7 ++-----
 2 files changed, 8 insertions(+), 20 deletions(-)

(limited to 'src/common')

diff --git a/src/common/fiber.cpp b/src/common/fiber.cpp
index f9aeb692a..bc92b360b 100644
--- a/src/common/fiber.cpp
+++ b/src/common/fiber.cpp
@@ -20,10 +20,8 @@ struct Fiber::FiberImpl {
     VirtualBuffer<u8> rewind_stack;
 
     std::mutex guard;
-    std::function<void(void*)> entry_point;
-    std::function<void(void*)> rewind_point;
-    void* rewind_parameter{};
-    void* start_parameter{};
+    std::function<void()> entry_point;
+    std::function<void()> rewind_point;
     std::shared_ptr<Fiber> previous_fiber;
     bool is_thread_fiber{};
     bool released{};
@@ -34,13 +32,8 @@ struct Fiber::FiberImpl {
     boost::context::detail::fcontext_t rewind_context{};
 };
 
-void Fiber::SetStartParameter(void* new_parameter) {
-    impl->start_parameter = new_parameter;
-}
-
-void Fiber::SetRewindPoint(std::function<void(void*)>&& rewind_func, void* rewind_param) {
+void Fiber::SetRewindPoint(std::function<void()>&& rewind_func) {
     impl->rewind_point = std::move(rewind_func);
-    impl->rewind_parameter = rewind_param;
 }
 
 void Fiber::Start(boost::context::detail::transfer_t& transfer) {
@@ -48,7 +41,7 @@ void Fiber::Start(boost::context::detail::transfer_t& transfer) {
     impl->previous_fiber->impl->context = transfer.fctx;
     impl->previous_fiber->impl->guard.unlock();
     impl->previous_fiber.reset();
-    impl->entry_point(impl->start_parameter);
+    impl->entry_point();
     UNREACHABLE();
 }
 
@@ -59,7 +52,7 @@ void Fiber::OnRewind([[maybe_unused]] boost::context::detail::transfer_t& transf
     u8* tmp = impl->stack_limit;
     impl->stack_limit = impl->rewind_stack_limit;
     impl->rewind_stack_limit = tmp;
-    impl->rewind_point(impl->rewind_parameter);
+    impl->rewind_point();
     UNREACHABLE();
 }
 
@@ -73,10 +66,8 @@ void Fiber::RewindStartFunc(boost::context::detail::transfer_t transfer) {
     fiber->OnRewind(transfer);
 }
 
-Fiber::Fiber(std::function<void(void*)>&& entry_point_func, void* start_parameter)
-    : impl{std::make_unique<FiberImpl>()} {
+Fiber::Fiber(std::function<void()>&& entry_point_func) : impl{std::make_unique<FiberImpl>()} {
     impl->entry_point = std::move(entry_point_func);
-    impl->start_parameter = start_parameter;
     impl->stack_limit = impl->stack.data();
     impl->rewind_stack_limit = impl->rewind_stack.data();
     u8* stack_base = impl->stack_limit + default_stack_size;
diff --git a/src/common/fiber.h b/src/common/fiber.h
index 873604bc6..f24d333a3 100644
--- a/src/common/fiber.h
+++ b/src/common/fiber.h
@@ -29,7 +29,7 @@ namespace Common {
  */
 class Fiber {
 public:
-    Fiber(std::function<void(void*)>&& entry_point_func, void* start_parameter);
+    Fiber(std::function<void()>&& entry_point_func);
     ~Fiber();
 
     Fiber(const Fiber&) = delete;
@@ -43,16 +43,13 @@ public:
     static void YieldTo(std::weak_ptr<Fiber> weak_from, Fiber& to);
     [[nodiscard]] static std::shared_ptr<Fiber> ThreadToFiber();
 
-    void SetRewindPoint(std::function<void(void*)>&& rewind_func, void* rewind_param);
+    void SetRewindPoint(std::function<void()>&& rewind_func);
 
     void Rewind();
 
     /// Only call from main thread's fiber
     void Exit();
 
-    /// Changes the start parameter of the fiber. Has no effect if the fiber already started
-    void SetStartParameter(void* new_parameter);
-
 private:
     Fiber();
 
-- 
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