From fa5e94f2c445d1bdaa4e495dc6c134961ba61076 Mon Sep 17 00:00:00 2001
From: gucio321 <gucio321@protonmail.com>
Date: Wed, 27 Nov 2024 19:37:21 +0100
Subject: [PATCH 1/2] context: use sync.Map for widget counter

while work on HellSpawner, turns out that there is a data race
on this file
---
 Context.go | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/Context.go b/Context.go
index 4d64433f..2c6e70a0 100644
--- a/Context.go
+++ b/Context.go
@@ -13,13 +13,15 @@ import (
 // GenAutoID automatically generates widget's ID.
 // It returns an unique value each time it is called.
 func GenAutoID(id string) ID {
-	idx, ok := Context.widgetIndex[id]
+	idx := int(0)
+	idxAny, ok := Context.widgetIndex.Load(id)
 
 	if ok {
+		idx = idxAny.(int)
 		idx++
 	}
 
-	Context.widgetIndex[id] = idx
+	Context.widgetIndex.Store(id, idx)
 
 	return ID(fmt.Sprintf("%s##%d", id, idx))
 }
@@ -51,7 +53,7 @@ type GIUContext struct {
 
 	isRunning bool
 
-	widgetIndex map[string]int
+	widgetIndex sync.Map
 
 	// Indicate whether current application is running
 	isAlive bool
@@ -83,7 +85,6 @@ func CreateContext(b backend.Backend[glfwbackend.GLFWWindowFlags]) *GIUContext {
 		textureLoadingQueue: queue.New(),
 		textureFreeingQueue: queue.New(),
 		m:                   &sync.Mutex{},
-		widgetIndex:         make(map[string]int),
 	}
 
 	// Create font
@@ -140,7 +141,7 @@ func (c *GIUContext) cleanStates() {
 		return true
 	})
 
-	c.widgetIndex = make(map[string]int)
+	c.widgetIndex.Clear()
 	c.dirty = false
 }
 

From cad1b8dee6cfec32792d962c8db4e65a5e26f1b8 Mon Sep 17 00:00:00 2001
From: gucio321 <gucio321@protonmail.com>
Date: Wed, 27 Nov 2024 19:40:59 +0100
Subject: [PATCH 2/2] check type assertion

---
 Context.go | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/Context.go b/Context.go
index 2c6e70a0..94930fa2 100644
--- a/Context.go
+++ b/Context.go
@@ -17,7 +17,9 @@ func GenAutoID(id string) ID {
 	idxAny, ok := Context.widgetIndex.Load(id)
 
 	if ok {
-		idx = idxAny.(int)
+		idx, ok = idxAny.(int)
+		Assert(ok, "Context", "GenAutoID", "unexpected type of widgetIndex value: expected int, instead found %T", idxAny)
+
 		idx++
 	}