mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-12-26 03:38:55 +01:00
122 lines
2.5 KiB
Go
122 lines
2.5 KiB
Go
// Copyright 2018 The Ebiten Authors
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
//
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
|
|
package thread
|
|
|
|
import (
|
|
"context"
|
|
"runtime"
|
|
)
|
|
|
|
type Thread interface {
|
|
Loop(ctx context.Context) error
|
|
Call(f func())
|
|
CallAsync(f func())
|
|
|
|
private()
|
|
}
|
|
|
|
type queueItem struct {
|
|
f func()
|
|
sync bool
|
|
}
|
|
|
|
// OSThread represents an OS thread.
|
|
type OSThread struct {
|
|
funcs chan queueItem
|
|
done chan struct{}
|
|
}
|
|
|
|
// NewOSThread creates a new thread.
|
|
func NewOSThread() *OSThread {
|
|
return &OSThread{
|
|
funcs: make(chan queueItem),
|
|
done: make(chan struct{}),
|
|
}
|
|
}
|
|
|
|
// Loop starts the thread loop until Stop is called on the current OS thread.
|
|
//
|
|
// Loop returns ctx's error if exists.
|
|
//
|
|
// Loop must be called on the OS thread.
|
|
func (t *OSThread) Loop(ctx context.Context) error {
|
|
runtime.LockOSThread()
|
|
defer runtime.UnlockOSThread()
|
|
|
|
for {
|
|
select {
|
|
case item := <-t.funcs:
|
|
func() {
|
|
if item.sync {
|
|
defer func() {
|
|
t.done <- struct{}{}
|
|
}()
|
|
}
|
|
item.f()
|
|
}()
|
|
case <-ctx.Done():
|
|
return ctx.Err()
|
|
}
|
|
}
|
|
}
|
|
|
|
// Call calls f on the thread.
|
|
//
|
|
// Do not call Call from the same thread. Call would block forever.
|
|
//
|
|
// Call blocks if Loop is not called.
|
|
func (t *OSThread) Call(f func()) {
|
|
t.funcs <- queueItem{f: f, sync: true}
|
|
<-t.done
|
|
}
|
|
|
|
func (t *OSThread) private() {
|
|
}
|
|
|
|
// CallAsync tries to queue f.
|
|
// CallAsync returns immediately if f can be queued.
|
|
// CallAsync blocks if f cannot be queued.
|
|
//
|
|
// Do not call CallAsync from the same thread. CallAsync would block forever.
|
|
func (t *OSThread) CallAsync(f func()) {
|
|
t.funcs <- queueItem{f: f, sync: false}
|
|
}
|
|
|
|
// NoopThread is used to disable threading.
|
|
type NoopThread struct{}
|
|
|
|
// NewNoopThread creates a new thread that does no threading.
|
|
func NewNoopThread() *NoopThread {
|
|
return &NoopThread{}
|
|
}
|
|
|
|
// Loop does nothing.
|
|
func (t *NoopThread) Loop(ctx context.Context) error {
|
|
return nil
|
|
}
|
|
|
|
// Call executes the func immediately.
|
|
func (t *NoopThread) Call(f func()) {
|
|
f()
|
|
}
|
|
|
|
// CallAsync executes the func immediately.
|
|
func (t *NoopThread) CallAsync(f func()) {
|
|
f()
|
|
}
|
|
|
|
func (t *NoopThread) private() {
|
|
}
|