---
title: "glIsSync(_:)"
framework: OpenGL ES
role: symbol
role_heading: Function
platforms: [iOS 7.0+, iPadOS 7.0+, Mac Catalyst 7.0+, tvOS 9.0+]
path: "opengles/glissync(_:)"
---

# glIsSync(_:)

## Declaration

```swift
func glIsSync(_ sync: GLsync!) -> GLboolean
```