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"""Subinterpreters High Level Module."""
import _xxsubinterpreters as _interpreters
# aliases:
from _xxsubinterpreters import (
ChannelError, ChannelNotFoundError, ChannelEmptyError,
is_shareable,
)
__all__ = [
'Interpreter', 'get_current', 'get_main', 'create', 'list_all',
'SendChannel', 'RecvChannel',
'create_channel', 'list_all_channels', 'is_shareable',
'ChannelError', 'ChannelNotFoundError',
'ChannelEmptyError',
]
def create(*, isolated=True):
"""
Initialize a new (idle) Python interpreter.
"""
id = _interpreters.create(isolated=isolated)
return Interpreter(id, isolated=isolated)
def list_all():
"""
Get all existing interpreters.
"""
return [Interpreter(id) for id in
_interpreters.list_all()]
def get_current():
"""
Get the currently running interpreter.
"""
id = _interpreters.get_current()
return Interpreter(id)
def get_main():
"""
Get the main interpreter.
"""
id = _interpreters.get_main()
return Interpreter(id)
class Interpreter:
"""
The Interpreter object represents
a single interpreter.
"""
def __init__(self, id, *, isolated=None):
self._id = id
self._isolated = isolated
@property
def id(self):
return self._id
@property
def isolated(self):
if self._isolated is None:
self._isolated = _interpreters.is_isolated(self._id)
return self._isolated
def is_running(self):
"""
Return whether or not the identified
interpreter is running.
"""
return _interpreters.is_running(self._id)
def close(self):
"""
Finalize and destroy the interpreter.
Attempting to destroy the current
interpreter results in a RuntimeError.
"""
return _interpreters.destroy(self._id)
def run(self, src_str, /, *, channels=None):
"""
Run the given source code in the interpreter.
This blocks the current Python thread until done.
"""
_interpreters.run_string(self._id, src_str)
def create_channel():
"""
Create a new channel for passing data between
interpreters.
"""
cid = _interpreters.channel_create()
return (RecvChannel(cid), SendChannel(cid))
def list_all_channels():
"""
Get all open channels.
"""
return [(RecvChannel(cid), SendChannel(cid))
for cid in _interpreters.channel_list_all()]
_NOT_SET = object()
class RecvChannel:
"""
The RecvChannel object represents
a recieving channel.
"""
def __init__(self, id):
self._id = id
def recv(self, *, _delay=10 / 1000): # 10 milliseconds
"""
Get the next object from the channel,
and wait if none have been sent.
Associate the interpreter with the channel.
"""
import time
sentinel = object()
obj = _interpreters.channel_recv(self._id, sentinel)
while obj is sentinel:
time.sleep(_delay)
obj = _interpreters.channel_recv(self._id, sentinel)
return obj
def recv_nowait(self, default=_NOT_SET):
"""
Like recv(), but return the default
instead of waiting.
This function is blocked by a missing low-level
implementation of channel_recv_wait().
"""
if default is _NOT_SET:
return _interpreters.channel_recv(self._id)
else:
return _interpreters.channel_recv(self._id, default)
class SendChannel:
"""
The SendChannel object represents
a sending channel.
"""
def __init__(self, id):
self._id = id
def send(self, obj):
"""
Send the object (i.e. its data) to the receiving
end of the channel and wait. Associate the interpreter
with the channel.
"""
import time
_interpreters.channel_send(self._id, obj)
time.sleep(2)
def send_nowait(self, obj):
"""
Like send(), but return False if not received.
This function is blocked by a missing low-level
implementation of channel_send_wait().
"""
_interpreters.channel_send(self._id, obj)
return False
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