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https://github.com/hajimehoshi/ebiten.git
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a18cddb39f
I've been doing some profiling of a very simple ebiten project, and noticed that thread.go was doing a bunch of unnecessary allocations to accomplish its work. This change seeks to reduce GC work. Input.go was also doing some unnecessary allocations. The thread.go change reduces the total number of allocations per frame from 1342 to 852 (~36% reduction). The input.go change reduces it further to 752 (~44% total reduction). Perf tests were done on windows.
59 lines
1.4 KiB
Go
59 lines
1.4 KiB
Go
// Copyright 2018 The Ebiten Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package thread
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import (
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"context"
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)
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// Thread represents an OS thread.
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type Thread struct {
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funcs chan func() error
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results chan error
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}
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// New creates a new thread.
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//
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// It is assumed that the OS thread is fixed by runtime.LockOSThread when New is called.
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func New() *Thread {
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return &Thread{
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funcs: make(chan func() error),
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results: make(chan error),
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}
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}
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// Loop starts the thread loop.
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//
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// Loop must be called on the thread.
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func (t *Thread) Loop(context context.Context) {
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loop:
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for {
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select {
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case f := <-t.funcs:
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t.results <- f()
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case <-context.Done():
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break loop
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}
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}
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}
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// Call calls f on the thread.
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//
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// Do not call this from the same thread. This would block forever.
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func (t *Thread) Call(f func() error) error {
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t.funcs <- f
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return <-t.results
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}
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