Fetch value associated with a variable from the shared netWorkSpace.
## S4 method for signature 'netWorkSpace' nwsFetch(.Object, xName)
a netWorkSpace class object
name of the variable to be fetched
nwsFetch method looks in the shared netWorkSpace
for a value bound to
xName; if it finds such a value,
returns it and removes it from the variable. If no value is found,
nwsFetch blocks until a value for
xName becomes available.
This operation is atomic. If there are multiple
nwsFetchTry requests for a given
xName, any given value from
the set of values associated with
xName will be returned to just one requester.
If there is more than one value associated with
xName, the particular
value removed depends on
xName's behavior. See
nwsDeclare for details.
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