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import time
from sys import stdout
from threading import Thread
import epics
from epics.ca import CAThread
pvlist_a = ('S14A:P0:mswAve:x:AdjustedCC',
'S14A:P0:ms:x:SetpointAO',
'S13C:P0:mswAve:x:AdjustedCC',
'S13C:P0:ms:x:SetpointAO',
'S13C:P0:mswAve:x:ErrorCC',
'S13B:P0:mswAve:x:AdjustedCC',
'S13B:P0:ms:x:SetpointAO',
'S13B:P0:mswAve:x:ErrorCC')
pvlist_b = ('S13B:P0:mswAve:x:AdjustedCC',
'S13B:P0:ms:x:SetpointAO',
'S13B:P0:mswAve:x:ErrorCC',
'S13ds:ID:SrcPt:xAngleM',
'S13ds:ID:SrcPt:xPositionM',
'S13ds:ID:SrcPt:yAngleM',
'S13ds:ID:SrcPt:yPositionM')
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(0.001)
[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")
for pvname in pvlist_a + pvlist_b:
p = epics.PV(pvname)
p.connect()
p.get()
print(p.info)
stdout.write("Run 2 Background Threads simultaneously:\n")
th1 = CAThread(target=run_test,args=(30, pvlist_a, 'A'))
th1.start()
th2 = CAThread(target=run_test,args=(60, pvlist_b, 'B'))
th2.start()
th2.join()
th1.join()
stdout.write('Done\n')
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