78 lines
1.3 KiB
Go
78 lines
1.3 KiB
Go
//go:build linux
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package linux
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import (
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"fmt"
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"runtime"
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"sync"
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)
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// Call calls f on the main thread and blocks until f finishes.
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func Call(f func()) {
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done := donePool.Get().(chan error)
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defer donePool.Put(done)
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data := funcData{fn: f, done: done}
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funcQ <- data
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if err := <-done; err != nil {
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panic(err)
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}
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}
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// Init initializes the functionality of running arbitrary subsequent functions be called on the main system thread.
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//
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// Init must be called in the main.main function.
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func Init(main func()) {
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done := donePool.Get().(chan error)
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defer donePool.Put(done)
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go func() {
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defer func() {
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done <- nil
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}()
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main()
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}()
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for {
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select {
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case f := <-funcQ:
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func() {
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defer func() {
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r := recover()
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if f.done != nil {
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if r != nil {
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f.done <- fmt.Errorf("%v", r)
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} else {
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f.done <- nil
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}
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} else {
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if r != nil {
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select {
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case erroQ <- fmt.Errorf("%v", r):
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default:
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}
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}
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}
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}()
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f.fn()
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}()
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case <-done:
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return
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}
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}
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}
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var (
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funcQ = make(chan funcData, runtime.GOMAXPROCS(0))
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erroQ = make(chan error, 42)
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donePool = sync.Pool{New: func() interface{} {
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return make(chan error)
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}}
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)
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type funcData struct {
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fn func()
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done chan error
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}
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