atomic api Example with multiprocessing and multiple threads::

You need the following steps to utilize the module:

1. create function used by child processes, refer to UIntAPIs , IntAPIs , BytearrayAPIs , StringAPIs , SetAPIs , ListAPIs , in each process, you can create multiple threads. on macOS, before the main process start, please set environment variable OBJC_DISABLE_INITIALIZE_FORK_SAFETY=YES, to alliviate Python bug

   def process_run(a):

       def subthread_run(a):

           a.array_sub_and_fetch(b'\x0F')

   threadlist = []

   for t in range(5000):

       threadlist.append(Thread(target=subthread_run, args=(a,)))

   for t in range(5000):

       threadlist[t].start()

   for t in range(5000):

       threadlist[t].join()

2. create the shared bytearray

   a = atomic_bytearray(b'ab', length=7, paddingdirection='r', paddingbytes=b'012', mode='m')

3. start processes/threads to utilize the shared bytearray

   processlist = []

   for p in range(2):

       processlist.append(Process(target=process_run, args=(a,)))

   for p in range(2):

       processlist[p].start()

   for p in range(2):

       processlist[p].join()

   assert a.value == int.to_bytes(27411031864108609,length=8,byteorder='big')