def doCommute(self, ref, fn, args):
"""
Sets the in-transaction-value of this ref to the given value, but does not require
other transactions that also change this ref to retry. Commutes are re-computed at
commit time and apply on top of any more recent changes.
"""
if not self._info or not self._info.running():
self._retry("RETRY - Not running in doCommute!")
# If we don't have an in-transaction-value yet for this ref
# get the latest one
if not ref in self._vals:
with shared_lock(ref._lock):
val = ref._tvals.val if ref._tvals else None
self._vals[ref] = val
# Add this commute function to the end of the list of commutes for this ref
self._commutes.setdefault(ref, []).append([fn, args])
# Save the value we get by applying the fn now to our in-transaction-list
returnValue = fn(*RT.cons(self._vals[ref], args))
self._vals[ref] = returnValue
return returnValue
def get(self):
with shared_lock(self._lock): return self._v
def get(self):
with shared_lock(self._lock):
return self._v
