Software Transactional Memory
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In pc science, software transactional memory (STM) is a concurrency control mechanism analogous to database transactions for controlling entry to shared memory in concurrent computing. It's an alternate to lock-based synchronization. STM is a technique implemented in software program, rather than as a hardware part. A transaction in this context happens when a bit of code executes a series of reads and writes to shared memory. These reads and writes logically occur at a single prompt in time