Dictionaries just store references to objects, right? So is it thread
safe to lock a specific key/val pair on a dictionary and modify its
val and release the lock?
example snippet:
# assuming d_lock was initialized long ago in a thread-safe manner
d_lock.acquire()
d = {}
d[1] = (threading.Lock(), [])
d_lock.release()
# test key level locking
for key, data in d.items():
row_lock, rows = data
row_lock.acquire()
rows.append(1)
row_lock.release()
Of course, I'll have to lock the entire dict when adding keys that
dont exist, but further calls and acquire the key specific lock before
doing any write operations.
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