atamurad

import hashlib
import hmac

def digest_data(data):
    if type(data) == list:
        return "[%s]" % (",".join([digest_data(v) for v in data if v]))
    elif type(data) == dict:
        kvs = sorted(data.items(), lambda x,y: cmp(x[0],y[0]))
        def prefix(key):
            return "" if type(key) == int else "%s:" % key

atamurad

def acquire(name):
    tries = 0
    while True:
        tries += 1
        if tries >= 30:
            raise Exception("Couldn't acquire lock on mutex "+name)
        try:
            n = r.incr("lock-"+name)
            if n == 1:
                return True