mirror of
https://github.com/hajimehoshi/ebiten.git
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65 lines
1.5 KiB
Go
65 lines
1.5 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 mainthread
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import (
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"runtime"
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"sync/atomic"
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)
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func init() {
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runtime.LockOSThread()
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}
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var (
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started = int32(0)
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funcs = make(chan func())
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)
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// Loop starts the main-thread loop.
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//
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// Loop must be called on the main thread.
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func Loop(ch <-chan error) error {
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atomic.StoreInt32(&started, 1)
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for {
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select {
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case f := <-funcs:
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f()
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case err := <-ch:
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// ch returns a value not only when an error occur but also it is closed.
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return err
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}
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}
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}
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// Run calls f on the main thread.
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//
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// Do not call this from the main thread. This would block forever.
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func Run(f func() error) error {
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if atomic.LoadInt32(&started) == 0 {
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// TODO: This can reach from other goroutine before Loop is called (#809).
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// panic("mainthread: the mainthread loop is not started yet")
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}
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ch := make(chan struct{})
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var err error
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funcs <- func() {
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err = f()
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close(ch)
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}
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<-ch
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return err
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}
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