EmbeddingGemma 2: an open, lightweight multimodal embedding model
deepmind.google·6d ago
AI Engineering
Lobsters·Aug 8·5 min read
Understanding std::counting_semaphore and std::binary_semaphore from C++20
TL;DR
C++20 introduces std::counting_semaphore and std::binary_semaphore to enhance thread synchronization. These tools allow for controlled access to resources and inter-thread signaling, improving concurrency management.
✦ Why It Matters
Implement std::counting_semaphore and std::binary_semaphore in your C++20 projects to enhance thread management today.
Key Takeaways
- Use std::counting_semaphore to limit concurrent thread operations.
- Implement std::binary_semaphore for simple thread signaling.
- Utilize RAII guards to manage semaphore resources safely.
- Explore timed waiting options to prevent indefinite blocking.
How It Works
std::counting_semaphore allows a defined number of threads to access a resource simultaneously by maintaining a counter. When a thread calls acquire(), the counter decreases, and if it reaches zero, subsequent threads must wait.
Conversely, std::binary_semaphore operates similarly but is limited to a binary state, making it ideal for signaling between threads. This flexibility allows developers to manage concurrency and communication effectively.