Concurrent, atomic MSI hash tables
a day ago
- #concurrency
- #hash-tables
- #atomic-operations
- MSI hash tables can be made thread-safe with atomic operations to avoid data races.
- For single-producer, multiple-consumer (SPMC) scenarios with relaxed ordering, use atomic loads for consumers and atomic stores for the producer.
- When keys represent objects (like pointers), acquire-release semantics ensure proper synchronization of object updates before consumers see them.
- For multiple-producer, multiple-consumer (MPMC) cases, use compare-and-swap (CAS) operations in producers to handle concurrent insertions without locks.
- Atomic operations may compile to the same machine code as non-atomic versions on some architectures (e.g., x86), primarily affecting compiler optimizations.