Question 1

How do I integrate Junction into my CMake project?

Accepted Answer

Clone Junction and Turf into adjacent folders, then use add_subdirectory in your CMakeLists.txt to include both targets. For a simple example, refer to the junction-sample repository on GitHub, which demonstrates this approach for easy updates.

Question 2

What are the performance differences between Crude, Linear, Leapfrog, and Grampa maps?

Accepted Answer

Crude maps use relaxed operations for lower overhead but weaker consistency, while Linear, Leapfrog, and Grampa maps offer stronger memory ordering guarantees at potentially higher cost. The blog post linked in the README provides detailed benchmarks to help choose based on your concurrency needs.

Question 3

Can Junction handle string keys or custom object values?

Accepted Answer

No, Junction only supports pointers or pointer-sized integers for keys and values. You would need to map complex types to pointers or consider alternative libraries if this is a requirement for your project.

Question 4

How does Junction avoid memory leaks in concurrent usage?

Accepted Answer

It uses Quiescent State-Based Reclamation (QSBR), requiring each thread to periodically call junction::DefaultQSBR.update. If omitted, memory will leak, so this must be integrated into your application's thread lifecycle management.

Question 5

Junction vs Intel TBB concurrent hash map: which should I use?

Accepted Answer

Junction offers specialized implementations with fine-tuned trade-offs for high-performance scenarios, while Intel TBB provides a more general-purpose concurrent hash map with broader data type support. Choose Junction if you need low-latency optimizations and can work within its limitations, or TBB for a more versatile toolkit.

Question 6

What platforms does Junction support?

Accepted Answer

Junction uses Turf for platform abstraction, supporting Unix-like systems, Windows, and even iOS via specific CMake toolchains. Check the Turf repository for detailed platform compatibility, as it handles compiler detection and configuration.

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