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To utilize the multi-core processors properly concurrent programming isneeded. Concurrency control is the main challenge while designing a correct andefficient concurrent program. Software Transactional Memory Systems (STMs)provides ease of multithreading to the programmer without worrying aboutconcurrency issues such as deadlock, livelock, priority inversion, etc. Most ofthe STMs works on read-write operations known as RWSTMs. Some STMs work athigh-level operations and ensure greater concurrency than RWSTMs. Such STMs areknown as Object-Based STMs (OSTMs). The transactions of OSTMs can return commitor abort. Aborted OSTMs transactions retry. But in the current setting ofOSTMs, transactions may starve. So, we proposed a Starvation-Free OSTM(SF-OSTM) which ensures starvation-freedom in object based STM systems whilesatisfying the correctness criteria as co-opacity. Databases, RWSTMs and OSTMssay that maintaining multiple versions corresponding to each key of transactionreduces the number of aborts and improves the throughput. So, to achievegreater concurrency, we proposed Starvation-Free Multi-Version OSTM (SF-MVOSTM)which ensures starvation-freedom while storing multiple versions correspondingto each key and satisfies the correctness criteria such as local opacity. Toshow the performance benefits, We implemented three variants of SF-MVOSTM(SF-MVOSTM, SF-MVOSTM-GC and SF-KOSTM) and compared it with state-of-the-artSTMs.

Achieving Starvation-Freedom with Greater Concurrency in Multi-Version Object-based Transactional Memory Systems