libxshmfence ☆

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Description:
X.Org: Shared memory 'SyncFence' synchronization primitive

Type: Formula | Tracked Since: Dec 28, 2025

Links: Homepage | formulae.brew.sh

Category: System utilities

Tags: x11 synchronization graphics xorg libxshmfence

Install: brew install libxshmfence

About:
libxshmfence is a lightweight X.Org library that implements a shared memory-based synchronization primitive known as 'SyncFence'. It provides a mechanism for clients and the X server to signal and wait for synchronization events without round-trip communication. This enables more efficient graphics rendering pipelines and reduces latency in compositors and drivers.

Key Features:

Shared memory-based synchronization primitive
Low-latency fence signaling and waiting
Lightweight implementation for X.Org
Enables efficient GPU command stream synchronization

Use Cases:

Synchronizing GPU command buffers in X11 drivers
Implementing efficient compositors for desktop environments
Reducing latency in graphics rendering pipelines

Alternatives:

XSync – XSync provides higher-level synchronization objects but with more overhead than shared memory fences
OpenGL sync objects – GL sync objects operate at the graphics driver level and are more heavyweight than libxshmfence

Version History

Detected	Version	Rev	Change	Commit
Dec 14, 2024 9:21pm		0	VERSION_BUMP	7337a79e
Oct 27, 2024 12:49pm		0	VERSION_BUMP	c08af688