add futex-semaphore example

[wokron]

No description provided.

[Copilot]

Pull request overview

This pull request adds a new example demonstrating futex-based semaphore and mutex implementations using io_uring's futex operations. The example showcases a producer-consumer pattern with configurable parameters.

Changes:

• Added a new FutexSemaphore class that implements a counting semaphore using futex operations
• Added a FutexMutex class built on top of the semaphore
• Implemented a producer-consumer example with command-line configuration options
• Updated CMakeLists.txt to build the new example

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 3 comments.

File	Description
examples/futex-semaphore.cpp	New example demonstrating futex-based synchronization primitives with a producer-consumer use case
examples/CMakeLists.txt	Added build target for the futex-semaphore example

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.