mirror of
https://github.com/hajimehoshi/ebiten.git
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72 lines
1.6 KiB
Go
72 lines
1.6 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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"sync/atomic"
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)
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// Thread represents an OS thread.
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type Thread struct {
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started int32
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funcs chan func()
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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()),
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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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atomic.StoreInt32(&t.started, 1)
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defer atomic.StoreInt32(&t.started, 0)
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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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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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if atomic.LoadInt32(&t.started) == 0 {
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panic("thread: the thread 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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t.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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