ebiten/internal/mainthread/mainthread.go

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// 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 mainthread
import (
"runtime"
)
func init() {
runtime.LockOSThread()
}
var funcs = make(chan func())
// Loop starts the main-thread loop.
//
// Loop must be called on the main thread.
func Loop(ch <-chan error) error {
for {
select {
case f := <-funcs:
f()
case err := <-ch:
// ch returns a value not only when an error occur but also it is closed.
return err
}
}
}
// Run calls f on the main thread.
func Run(f func() error) error {
ch := make(chan struct{})
var err error
funcs <- func() {
err = f()
close(ch)
}
<-ch
return err
}