Do I need to synchronize a call to the interrupt method?

Question

Consulting the JavaDocs and the source code of the Thread.interrupt() method in Java SE 7 I found this:

public void interrupt() {
          


        

Answer 1

Yeah, source says interrupting a dead thread has no effect. So it'll be threadsafe inherently.

It says "Interrupting a thread that is not alive need not have any effect."

Interrupts this thread. Unless the current thread is interrupting itself, which is always permitted, the checkAccess() methodof this thread is invoked, which may cause a SecurityException to be thrown. If this thread is blocked in an invocation of the wait(), wait(long), or wait(long,int) methods of the Object class, or of the join(), join(long), join(long,int), sleep(long), or sleep(long,int), methods of this class, then its interrupt status will be cleared and it will receive an InterruptedException. If this thread is blocked in an I/O operation upon an java.nio.channels.InterruptibleChannel interruptiblechannel then the channel will be closed, the thread's interruptstatus will be set, and the thread will receive a java.nio.channels.ClosedByInterruptException. If this thread is blocked in a java.nio.channels.Selector then the thread's interrupt status will be set and it will return immediately from the selection operation, possibly with a non-zero value, just as if the selector's java.nio.channels.Selector wakeup method were invoked. If none of the previous conditions hold then this thread's interrupt status will be set. Interrupting a thread that is not alive need not have any effect.