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"""This script tests using EPICS CA and Python threads together
Based on code from Friedrich Schotte, NIH, modified by Matt Newville
19-Apr-2010
"""
import time
from sys import stdout
from threading import Thread
import epics
from epics.ca import CAThread
from pvnames import updating_pvlist
pvlist_a = updating_pvlist[:-1]
pvlist_b = updating_pvlist[1:]
def run_test(runtime=1, pvnames=None, run_name='thread c'):
msg = '-> thread "%s" will run for %.3f sec, monitoring %s\n'
stdout.write(msg % (run_name, runtime, pvnames))
def onChanges(pvname=None, value=None, char_value=None, **kw):
stdout.write(' %s = %s (%s)\n' % (pvname, char_value, run_name))
stdout.flush()
# epics.ca.use_initial_context() # epics.ca.create_context()
start_time = time.time()
pvs = [epics.PV(pvn, callback=onChanges) for pvn in pvnames]
while time.time()-start_time < runtime:
time.sleep(0.1)
[p.clear_callbacks() for p in pvs]
stdout.write( 'Completed Thread %s\n' % ( run_name))
stdout.write( "First, create a PV in the main thread:\n")
p = epics.PV(updating_pvlist[0])
stdout.write("Run 2 Background Threads simultaneously:\n")
th1 = CAThread(target=run_test,args=(3, pvlist_a, 'A'))
th1.start()
th2 = CAThread(target=run_test,args=(6, pvlist_b, 'B'))
th2.start()
th2.join()
th1.join()
stdout.write('Done\n')
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