RFR(L): JDK-8046936 : JEP 270: Reserved Stack Areas for Critical Sections

David Holmes david.holmes at oracle.com
Fri Nov 20 02:25:34 UTC 2015

On 20/11/2015 4:10 AM, Doug Lea wrote:
> On 11/16/2015 08:00 PM, David Holmes wrote:
>>> I've tried that :-) The amount of code being executed with
>>> the ReservedStackAccess privilege tends to increase very
>>> quickly and I was concerned about keeping the size of the
>>> reserved area small.
>> How much space does each level of calling need? I know that is hard to
>> answer
>> but are we talking a few bytes, few kb, many kb?
> Relatedly, could someone spell out in more detail the
> worst-case behavior of StackOverflowError? Knowing this
> might be helpful in some cases in which we might be able to
> at least preserve minimal sanity without needing to reserve.

Not sure what you are asking for Doug - worst-case is that an action 
that is critical to complete does not complete. Best example is 
lock/unlock which have to both update AQS-state and update owner. If 
only one is done the lock internal state is inconsistent and the lock 
ceases to function.


> -Doug

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