import gc
import sys

# Unused imports, but removing them "hides" the bug
import logging
import socket
import pickle
# ---



#############
PySet_MINSIZE = 8
SET_MASK = PySet_MINSIZE - 1
FIXED_HASH = 1
if not FIXED_HASH:
    hash_values = [None] * 100
else:
    hash_values = [3, 2, 5, 6, 5, 1, 0, 3, 4, 2, 0, 1, 3, 2, 3, 4, 7, 7, 7, 2, 0, 1, 4, 6, 0, 3, 3, 1, 3, 2, 0, 7, 7, 7, 2]
hash_i = 0


class Thread2:
    def __init__(self):
        global hash_i

        if FIXED_HASH:
            self.hashvalue = hash_values[hash_i]
        else:
            k = hash(self) & SET_MASK
            hash_values[hash_i] = k
            print(hash_values[:hash_i+1])
        hash_i += 1

    if FIXED_HASH:
        def __hash__(self):
            return self.hashvalue


def test_current_frames():
    item = Thread2()
    dangling.add(item)
    dangling.discard(item)
    item = None



dangling = set()
main_thread = Thread2()
dangling.add(main_thread)
###############



def dash_R():
    nwarmup, ntracked = (4, 30)
    repcount = nwarmup + ntracked
    alloc_deltas = [0] * ntracked
    # prealloc all integers for sys.getallocatedblocks() result
    integers = list(range(50_000))

    alloc_before = 0

    for i in range(nwarmup):
        test_current_frames()
        alloc_before = sys.getallocatedblocks()

    for i in range(ntracked):
        test_current_frames()

        alloc_after = sys.getallocatedblocks()
        alloc_deltas[i] = alloc_after - alloc_before
        alloc_before = alloc_after
        i = None

    if any(delta >= 1 for delta in alloc_deltas):
        msg = 'test_leak leaked %s %s, sum=%s' % (
            alloc_deltas, 'memory blocks', sum(alloc_deltas))
        print(msg, file=sys.stderr, flush=True)
        failed = True
    else:
        print("no leak")
        failed = False

    return failed


def warm_caches():
    # char cache
    s = bytes(range(256))
    for i in range(256):
        s[i:i+1]
    # unicode cache
    [chr(i) for i in range(256)]
    # int cache
    list(range(-5, 257))

if __name__ == "__main__":
    warm_caches()
    dash_R()