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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 rasied

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')