⚡ Optimize hotkey service

internal/common/hotkey/windows/mainthread.go

@@ -0,0 +1,77 @@
+//go:build windows
+
+package windows
+
+import (
+	"fmt"
+	"runtime"
+	"sync"
+)
+
+// Call calls f on the main thread and blocks until f finishes.
+func Call(f func()) {
+	done := donePool.Get().(chan error)
+	defer donePool.Put(done)
+
+	data := funcData{fn: f, done: done}
+	funcQ <- data
+	if err := <-done; err != nil {
+		panic(err)
+	}
+}
+
+// Init initializes the functionality of running arbitrary subsequent functions be called on the main system thread.
+//
+// Init must be called in the main.main function.
+func Init(main func()) {
+	done := donePool.Get().(chan error)
+	defer donePool.Put(done)
+
+	go func() {
+		defer func() {
+			done <- nil
+		}()
+		main()
+	}()
+
+	for {
+		select {
+		case f := <-funcQ:
+			func() {
+				defer func() {
+					r := recover()
+					if f.done != nil {
+						if r != nil {
+							f.done <- fmt.Errorf("%v", r)
+						} else {
+							f.done <- nil
+						}
+					} else {
+						if r != nil {
+							select {
+							case erroQ <- fmt.Errorf("%v", r):
+							default:
+							}
+						}
+					}
+				}()
+				f.fn()
+			}()
+		case <-done:
+			return
+		}
+	}
+}
+
+var (
+	funcQ    = make(chan funcData, runtime.GOMAXPROCS(0))
+	erroQ    = make(chan error, 42)
+	donePool = sync.Pool{New: func() interface{} {
+		return make(chan error)
+	}}
+)
+
+type funcData struct {
+	fn   func()
+	done chan error
+}