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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
modified MN, 22-April-2011 (1 year later!)
to support new context-switching modes
"""
import time
import epics
import sys
from threading import Thread
from epics.ca import CAThread, withInitialContext
from pvnames import updating_pvlist
write = sys.stdout.write
flush = sys.stdout.flush
epics.ca.PREEMPTIVE_CALLBACK=True
def wait_for_changes(pvnames, runtime, runname):
"""basic test procedure called by other tests
"""
def onChanges(pvname=None, value=None, char_value=None, **kw):
write(' %s= %s (%s)\n' % (pvname, char_value, runname))
flush()
t0 = time.time()
pvs = []
for pvn in pvnames:
p = epics.PV(pvn)
p.get()
p.add_callback(onChanges)
pvs.append(p)
while time.time()-t0 < runtime:
try:
time.sleep(0.01)
except:
sys.exit()
for p in pvs:
p.clear_callbacks()
def test_initcontext(pvnames, runtime, run_name):
write(' -> force inital ca context: thread=%s will run for %.3f sec\n' % (run_name, runtime))
epics.ca.use_initial_context()
wait_for_changes(pvnames, runtime, run_name)
write( 'Done with Thread %s\n' % ( run_name))
@withInitialContext
def test_decorator(pvnames, runtime, run_name):
write(' -> use withInitialContext decorator: thread=%s will run for %.3f sec\n' % (run_name, runtime))
wait_for_changes(pvnames, runtime, run_name)
write( 'Done with Thread %s\n' % ( run_name))
def test_CAThread(pvnames, runtime, run_name):
write(' -> used with CAThread: thread=%s will run for %.3f sec\n' % (run_name, runtime))
wait_for_changes(pvnames, runtime, run_name)
write( 'Done with Thread %s\n' % ( run_name))
def run_threads(threadlist):
for th in threadlist:
th.start()
time.sleep(0.01)
for th in threadlist:
th.join()
time.sleep(0.01)
# MAIN
write("Connecting to PVs\n")
pvs_b = []
names_b = []
for pvname in updating_pvlist:
###pvs_b.append(epics.PV(pvname))
# pvs_b.append(pvname)
names_b.append(pvname)
names_a = names_b[1:]
pvs_a = pvs_b[1:]
epics.ca.create_context()
styles = ('decorator', 'init', 'cathread')
style = styles[2]
if style == 'init':
write( 'Test use plain threading.Thread, force use of initial CA Context \n')
th1 = Thread(target=test_initcontext, args=(names_a, 2, 'A'))
th2 = Thread(target=test_initcontext, args=(names_b, 3, 'B'))
run_threads((th1, th2))
elif style == 'decorator':
write( 'Test use plain threading.Thread, withInitialContext decorator\n')
th1 = Thread(target=test_decorator, args=(names_a, 3, 'A'))
th2 = Thread(target=test_decorator, args=(names_b, 5, 'B'))
run_threads((th1, th2))
elif style == 'cathread':
write( 'Test use CAThread\n')
th1 = CAThread(target=test_CAThread, args=(names_a, 3, 'A'))
th2 = CAThread(target=test_CAThread, args=(names_b, 5, 'B'))
run_threads((th1, th2))
write('Test Done\n---------------------\n')
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