[bug ]The application freezes and does not respond tightly

[lchpazik]

What happend?

When you start the application, it freezes, it may start after 3,5,6 times, or it may not start. I don't understand what the problem is. The issue tends to reproduce approximately once in every 30-50 launches. Please attempt multiple restarts to observe the problem, as it may not occur within the first few attempts.

Code example

main.go

var (
	key string
)

 func GoGetCenterScreen(width, height int) (int, int) {
 	centerX := width / 2
 	centerY := height / 2
 	return centerX, centerY
 }

func loop() {
	giu.PushStyleColor(giu.StyleColorWindowBg, giu.Vec4ToRGBA(imgui.Vec4{X: 0, Y: 0, Z: 0, W: 1.00}))
	imgui.PushStyleColorVec4(imgui.ColWindowBg, imgui.Vec4{X: 0, Y: 0, Z: 0, W: 1.00})
	giu.SingleWindow().Layout(
		giu.PrepareMsgbox(),
		giu.Align(giu.AlignCenter).To(
			giu.Label("Please, enter the key:"),
			giu.InputText(&key).Size(400),
			giu.Button("Авторизоваться").OnClick(func() {
				if key == "" {
					giu.Msgbox("Ошибка", "Ключ не может быть пустым.")
					return
				}
				fmt.Println("Ключ:", key)
			}),
		),
	)
	imgui.PopStyleColor()
	giu.PopStyleColor()
}
func loadIcon(filePath string) (image.Image, error) {
	file, err := os.Open(filePath)
	if err != nil {
		return nil, err
	}
	defer file.Close()

	icon, err := png.Decode(file)
	if err != nil {
		return nil, err
	}

	return icon, nil
}

func main() {
	screenWidth, screenHeight := robotgo.GetScreenSize()

	centerX, centerY := GoGetCenterScreen(screenWidth, screenHeight)

	wnd := giu.NewMasterWindow("Loader", 500, 400, giu.MasterWindowFlagsNotResizable)
	wnd.SetPos(centerX-250, centerY-200)

	icon, err := loadIcon("C:/Users/skyar/OneDrive/Рабочий стол/loader/src/59365.png")
	if err == nil {
		wnd.SetIcon(icon)
	} else {
		fmt.Println("Ошибка загрузки иконки:", err)
	}

	wnd.Run(loop)
}

To Reproduce

1. Run my demo
2. will see the crash...

Version

(latest)

OS

Windows 11

[cjbrigato]

Is this on windows? is so, is your icon if dimension 2^n ?

[SleepyPrince]

I think I am facing similar issue of occasion freeze on start. It is very random, and even happens when having just a master window and an empty run loop.
I tried using older version of giu, and it seems to start happening from v0.8.0, v0.7.0 seems not affected.

[lchpazik]

I found a fix for the application freezing issue. It's necessary to add runtime.LockOSThread() and runtime.UnlockOSThread() in the main function to ensure proper access to the GUI from a single thread. This should resolve the freezing during startup.

Fixed code

main.go

package main

import (
	"fmt"
	"runtime"

	g "github.com/AllenDang/giu"
)

func onClickMe() {
	fmt.Println("Hello world!")
}

func onImSoCute() {
	fmt.Println("Im sooooooo cute!!")
}

func loop() {
	g.SingleWindow().Layout(
		g.Label("Hello world from giu"),
		g.Row(
			g.Button("Click Me").OnClick(onClickMe),
			g.Button("I'm so cute").OnClick(onImSoCute),
		),
	)
}

func main() {
	runtime.LockOSThread()
	wnd := g.NewMasterWindow("Hello world", 400, 200, g.MasterWindowFlagsNotResizable)
	wnd.Run(loop)
	runtime.UnlockOSThread()
}

Version

(latest)

[gucio321]

ref: #764

[gucio321]

Could you guys try this?

diff --git a/mainthread_windows.go b/mainthread_windows.go
index e38db0d..4eade0a 100755
--- a/mainthread_windows.go
+++ b/mainthread_windows.go
@@ -3,10 +3,16 @@
 
 package giu
 
+import "runtime"
+
+func init() {
+	runtime.LockOSThread()
+}
+
 // TODO: I have no working mainthread library for windows.
 // - this one for macOS crashes app immediately
 // - this for linux (and everything else) freezes after a few seconds
-// 
+//
 // With no mianthread support this at least runs sometimes. Just keep your giu calls in one thread and everything should work.
 func mainthreadCallPlatform(c func()) {
 	c()

[gucio321]

CC @kenn1dy @SleepyPrince

[ioxenus]

@gucio321 Yeah, that diff has fixed the same issue for me as well (Windows 11, latest giu/cimgui-go master), thanks a lot!

[gucio321]

ok, so let me apply that diff to master and close this and #764