In computer science, especially parallel computing, synchronization means the coordination of simultaneous threads or processes to complete a task in order to get correct runtime order and avoid unexpected race conditions.   Computer science is the study of the theoretical foundations of information and computation and their implementation and application in computer systems. ... Parallel computing is the simultaneous execution of the same task (split up and specially adapted) on multiple processors in order to obtain results faster. ... A race hazard (or race condition) is a flaw in a system or process where the output exhibits unexpected critical dependence on the relative timing of events. ...

There are many types of synchronization:

• barrier
• lock/semaphore
• synchronous communication operations