mirror of
https://github.com/hajimehoshi/ebiten.git
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122 lines
2.5 KiB
Go
122 lines
2.5 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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"runtime"
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)
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type Thread interface {
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Loop(ctx context.Context) error
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Call(f func())
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CallAsync(f func())
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private()
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}
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type queueItem struct {
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f func()
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sync bool
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}
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// OSThread represents an OS thread.
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type OSThread struct {
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funcs chan queueItem
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done chan struct{}
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}
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// NewOSThread creates a new thread.
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func NewOSThread() *OSThread {
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return &OSThread{
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funcs: make(chan queueItem),
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done: make(chan struct{}),
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}
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}
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// Loop starts the thread loop until Stop is called on the current OS thread.
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//
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// Loop returns ctx's error if exists.
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//
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// Loop must be called on the OS thread.
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func (t *OSThread) Loop(ctx context.Context) error {
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runtime.LockOSThread()
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defer runtime.UnlockOSThread()
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for {
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select {
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case item := <-t.funcs:
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func() {
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if item.sync {
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defer func() {
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t.done <- struct{}{}
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}()
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}
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item.f()
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}()
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case <-ctx.Done():
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return ctx.Err()
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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 Call from the same thread. Call would block forever.
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//
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// Call blocks if Loop is not called.
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func (t *OSThread) Call(f func()) {
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t.funcs <- queueItem{f: f, sync: true}
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<-t.done
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}
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func (t *OSThread) private() {
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}
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// CallAsync tries to queue f.
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// CallAsync returns immediately if f can be queued.
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// CallAsync blocks if f cannot be queued.
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//
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// Do not call CallAsync from the same thread. CallAsync would block forever.
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func (t *OSThread) CallAsync(f func()) {
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t.funcs <- queueItem{f: f, sync: false}
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}
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// NoopThread is used to disable threading.
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type NoopThread struct{}
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// NewNoopThread creates a new thread that does no threading.
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func NewNoopThread() *NoopThread {
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return &NoopThread{}
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}
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// Loop does nothing.
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func (t *NoopThread) Loop(ctx context.Context) error {
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return nil
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}
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// Call executes the func immediately.
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func (t *NoopThread) Call(f func()) {
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f()
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}
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// CallAsync executes the func immediately.
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func (t *NoopThread) CallAsync(f func()) {
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f()
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}
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func (t *NoopThread) private() {
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}
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