Andrew John Hughes wrote:
:
The use of synchronized at present seems flawed as only the set
methods are protected and not the get. So lb.get could be called
while in an lb.put call. I don't see the reason for using a
LongBuffer either, as only index 0 is ever used. Why not use an
AtomicLong?
The LongBuffer is a direct buffer with a reference to memory in the
PerfData instrumentation buffer. This is the shared memory that jvmstat
clients (jstat, VisualVM , ..) will attach to in order to monitor the VM.
What is the purpose of d3dAvailable? I don't know this piece of code
so I'm not sure what it's counting, but it will presumably be zero
forever on non-Windows systems.
Mandy can say more about this, but it essentially allows jstat to see if
the target VM is using the D3D pipeline or not.
-Alan.
