synchronization hardware

Synchronization Hardware

Test-and-Set

Test-and-set is an atomic hardware operation used in concurrent programming to ensure mutual exclusion when multiple threads or processes access shared resources. It involves reading a value from memory, testing it, and then setting it to a new value in a single, atomic operation. This ensures that only one thread or process can modify the value at a time, preventing race conditions.

Test-and-set is commonly used in low-level synchronization mechanisms like spinlocks.

Compare-and-Swap

Compare-and-swap (CAS) is another atomic operation used in multi-threaded programming to synchronize access to shared memory. It compares the value of a memory location with a specified value, and if they match, it swaps the memory location’s value with a new value. CAS is widely used in implementing lock-free data structures and algorithms, as it avoids the need for traditional locking mechanisms, thus improving performance in highly concurrent systems.

Sources:

Tanenbaum, A. S. (2001). Modern Operating Systems. Stallings, W. (2013). Operating Systems: Internals and Design Principles.