Thread Safety

The primary motivation behind using multiple threads is improving program performance that may be measured with metrics such as throughput, responsiveness, latency, etc. Whenever threads are introduced in a program, the shared state amongst the threads becomes vulnerable to corruption. If a class or a program has immutable state then the class is necessarily thread-safe. Similarly, the shared state in an application where the same thread mutates the state using an operation that translates into an atomic bytecode instruction can be safely read by multiple reader threads. In contrast, a sole writer thread mutating ...