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import time
import epics
import pvnames
pvname = pvnames.double_pv
mypv = epics.PV(pvname)
def wait(timeout=6):
t0 = time.time()
while time.time() - t0 < timeout:
time.sleep(1.e-3)
epics.poll()
print( 'Created PV = ', mypv)
def CB1(pvname=None, value=None, char_value=None, **kw):
print( 'CB1 PV Changed! ', pvname, value, char_value )
def CB2(pvname=None, value=None, char_value=None, **kw):
print( 'CB2 ! ', pvname, value, char_value)
mypv.add_callback(CB1)
print( 'Added a callback. Now wait for changes')
print( 'ready')
wait(10)
print( 'now, add another: ')
mypv.add_callback(CB2)
wait(10)
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