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"""Implements InterpreterPoolExecutor."""
from concurrent import interpreters
import sys
import textwrap
from . import thread as _thread
import traceback
def do_call(results, func, args, kwargs):
try:
return func(*args, **kwargs)
except BaseException as exc:
# Send the captured exception out on the results queue,
# but still leave it unhandled for the interpreter to handle.
try:
results.put(exc)
except interpreters.NotShareableError:
# The exception is not shareable.
print('exception is not shareable:', file=sys.stderr)
traceback.print_exception(exc)
results.put(None)
raise # re-raise
class WorkerContext(_thread.WorkerContext):
@classmethod
def prepare(cls, initializer, initargs):
def resolve_task(fn, args, kwargs):
if isinstance(fn, str):
# XXX Circle back to this later.
raise TypeError('scripts not supported')
else:
task = (fn, args, kwargs)
return task
if initializer is not None:
try:
initdata = resolve_task(initializer, initargs, {})
except ValueError:
if isinstance(initializer, str) and initargs:
raise ValueError(f'an initializer script does not take args, got {initargs!r}')
raise # re-raise
else:
initdata = None
def create_context():
return cls(initdata)
return create_context, resolve_task
def __init__(self, initdata):
self.initdata = initdata
self.interp = None
self.results = None
def __del__(self):
if self.interp is not None:
self.finalize()
def initialize(self):
assert self.interp is None, self.interp
self.interp = interpreters.create()
try:
maxsize = 0
self.results = interpreters.create_queue(maxsize)
if self.initdata:
self.run(self.initdata)
except BaseException:
self.finalize()
raise # re-raise
def finalize(self):
interp = self.interp
results = self.results
self.results = None
self.interp = None
if results is not None:
del results
if interp is not None:
interp.close()
def run(self, task):
try:
return self.interp.call(do_call, self.results, *task)
except interpreters.ExecutionFailed as wrapper:
# Wait for the exception data to show up.
exc = self.results.get()
if exc is None:
# The exception must have been not shareable.
raise # re-raise
raise exc from wrapper
class BrokenInterpreterPool(_thread.BrokenThreadPool):
"""
Raised when a worker thread in an InterpreterPoolExecutor failed initializing.
"""
class InterpreterPoolExecutor(_thread.ThreadPoolExecutor):
BROKEN = BrokenInterpreterPool
@classmethod
def prepare_context(cls, initializer, initargs):
return WorkerContext.prepare(initializer, initargs)
def __init__(self, max_workers=None, thread_name_prefix='',
initializer=None, initargs=()):
"""Initializes a new InterpreterPoolExecutor instance.
Args:
max_workers: The maximum number of interpreters that can be used to
execute the given calls.
thread_name_prefix: An optional name prefix to give our threads.
initializer: A callable or script used to initialize
each worker interpreter.
initargs: A tuple of arguments to pass to the initializer.
"""
super().__init__(max_workers, thread_name_prefix,
initializer, initargs)
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