Unsafe: removing the monitorEnter/monitorExit/tryMonitorEnter methods

Tom Hawtin tom.hawtin at oracle.com
Thu Mar 6 14:48:03 UTC 2014

On 04/03/2014 15:32, David M. Lloyd wrote:
> On 03/03/2014 09:45 PM, David Holmes wrote:

>> We should not introduce anything that allows something that was
>> guaranteed to be safe by the language, to become unsafe.
> Define 'safe'.  Because I don't think it's unsafe, any more than

I believe even in the Java library it is common where a publicly 
accessible monitor is used to safeguard the integrity of security 
critical datastructures. Where monitorexit to become freely available, 
that would almost certainly be exploitable.

(Technically I believe the JVM spec does (or did) allow unmatched 
locking in some circumstances, but implementations really shouldn't.)


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