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# test _thread lock object using a single thread
#
# MIT license; Copyright (c) 2016 Damien P. George on behalf of Pycom Ltd
import _thread
# create lock
lock = _thread.allocate_lock()
print(type(lock) == _thread.LockType)
# should be unlocked
print(lock.locked())
# basic acquire and release
print(lock.acquire())
print(lock.locked())
lock.release()
print(lock.locked())
# try acquire twice (second should fail)
print(lock.acquire())
print(lock.locked())
print(lock.acquire(0))
print(lock.locked())
lock.release()
print(lock.locked())
# test with capabilities of lock
with lock:
print(lock.locked())
# test that lock is unlocked if an error is raised
try:
with lock:
print(lock.locked())
raise KeyError
except KeyError:
print("KeyError")
print(lock.locked())
# test that we can't release an unlocked lock
try:
lock.release()
except RuntimeError:
print("RuntimeError")
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