Synchronized

A synchronized statement acquires a mutual-exclusion lock on behalf of the executing thread, executes a contained statement, then releases the lock. While the executing thread owns the lock, no other thread may acquire the lock.

Statement is executed by evaluating the expression and thread locks are assosiated with returned value. Lock is released when statements ends, either normally or abruptly.

  synchronized := "synchronized" "(" expr-startobject ")" statement 

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