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import threading, time
b = 50
l = threading.Lock()
def threadcode():
global b
print "Thread %s invoked" % threading.currentThread().getName()
l.acquire()
try:
print "Thread %s running" % threading.currentThread().getName()
time.sleep(1)
b = b + 50
print "Thread %s set b to %d" % (threading.currentThread().getName(),b)
finally:
l.release()
print "Value of b at start of program:", b
childthreads = []
for i in range(1, 5):
t = threading.Thread(target = threadcode, name = "Thread-%d" % i)
t.setDaemon(1)
t.start()
childthreads.append(t)
for t in childthreads:
t.join()
print "New value of b:", b
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