If ``++Thread.sleep(...)++`` is called when the current thread holds a lock, it could lead to performance and scalability issues, or even worse to deadlocks because the execution of the thread holding the lock is frozen. It's better to call ``++wait(...)++`` on the monitor object to temporarily release the lock and allow other threads to run.


== Noncompliant Code Example

[source,java]
----
public void doSomething(){
  synchronized(monitor) {
    while(notReady()){
      Thread.sleep(200);
    }
    process();
  }
  ...
}
----


== Compliant Solution

[source,java]
----
public void doSomething(){
  synchronized(monitor) {
    while(notReady()){
      monitor.wait(200);
    }
    process();
  }
  ...
}
----


== See

* https://wiki.sei.cmu.edu/confluence/x/YTdGBQ[CERT, LCK09-J.] - Do not perform operations that can block while holding a lock


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