Since most of the time you have to hold the lock anyway for other reasons, I think this would generally be an unwelcome change since I expect the cost of recursive lock acquisition is nonzero.

On 05/28/2015 11:08 AM, Ulf Zibis wrote:
Hi all,

in the Javadoc of notify(), notifyAll() and wait(...) I read, that this
methods should only be used with synchronisation on it's instance.
So I'm wondering, why they don't have the synchronized modifier out of
the box in Object class.

Also I think, the following note should be moved from wait(long,int) to
wait(long):
/The current thread must own this object's monitor. The thread releases
ownership of this monitor and waits until either of the following two
conditions has occurred://
/

  * /Another thread notifies threads waiting on this object's monitor to
wake up either through a
    call to the notify method or the notifyAll method./
  * /The timeout period, specified by timeout milliseconds plus nanos
nanoseconds arguments, has
    elapsed. /



Cheers,

Ulf


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- DML

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