# test concurrent interning of strings
#
# MIT license; Copyright (c) 2016 Damien P. George on behalf of Pycom Ltd

try:
 import utime as time
except ImportError:
 import time
import _thread

# function to check the interned string
def check(s, val):
 assert type(s) == str
 assert int(s) == val


# main thread function
def th(base, n):
 for i in range(n):
 # this will intern the string and check it
 exec("check('%u', %u)" % (base + i, base + i))

 with lock:
 global n_finished
 n_finished += 1


lock = _thread.allocate_lock()
n_thread = 4
n_finished = 0
n_qstr_per_thread = 100 # make 1000 for a more stressful test (uses more heap)

# spawn threads
for i in range(n_thread):
 _thread.start_new_thread(th, (i * n_qstr_per_thread, n_qstr_per_thread))

# wait for threads to finish
while n_finished < n_thread:
 time.sleep(1)

print("pass")