Q about Readwrite lock in concurrency

Question

If I want to implement read-write data through a ReentrantReadwriteLock,
often we will use :
try {
mylock.lock();
activity...
finally{ mylock.unlock();}
but what if the real"activity" is actually done else where. Can I just make two methods SetLock() and ReleaseLock()
void SetLock(){
mylock.lock();}
void ReleaseLock(){
mylock.unlock;}
and let them called when needed

Answer 1

You're getting this compeltely back to front. Somewhere you have to create the lock object, store it in a variable, acquire the lock, call the method, and release the lock. The only correct way to do that is to release the lock in a 'finally' block, which implies that you have to allocate the lock in the same method so you have the lock reference. So what you are looking for is this:
try
  mylock.lock();
  callTheMethodThatDoesTheActivity();
finally
  mylock.unlock();
}BTW this thread is in the wrong forum. The experts on concurrency are concentrated in the Concurrency forum.