Hey Jonathan,
On 03.10.2015 16:25, Jonathan Mitchell wrote:
In my ObjC->Mono bridge I have been using the Boehm collector and pinned memory
(as an expedient).
I now want to move to SGEN and moveable memory.
As a first step I have switched to SGEN and left pinning enabled.
My ObjC code wraps a MonoObject * in an NSObject.
When the MonoObject is set it is pinned.
A simple monoObjectTrace property watches to see if the MonoObject moves.
Under the Boehm collector objects seem to stay pinned as requested.
Under SGEN they don’t i.e.: the exception in the second method below raises
i.e.: self.monoObjectTrace != (NSUInteger)monoObject)
What am I doing wrong?
It depends on how your methods are actually used.
In setMonoObject, there is a time frame between
mono_gchandle_free ()
mono_gchandle_new ()
where the GC might regain control and move the object.
Try to ensure that setMonoObject is called only once for
the same obj, such that mono_gchandle_free () followed
by mono_gchandle_new () isn't needed.
Robert
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