def run_with_timeout_and_stack(request, timeout):
'''
interrupts evaluation after a given time period. provides a suitable stack environment.
'''
# only use set_thread_stack_size if max recursion depth was changed via the environment variable
# MATHICS_MAX_RECURSION_DEPTH. if it is set, we always use a thread, even if timeout is None, in
# order to be able to set the thread stack size.
if MAX_RECURSION_DEPTH > settings.DEFAULT_MAX_RECURSION_DEPTH:
set_thread_stack_size(python_stack_size(MAX_RECURSION_DEPTH))
elif timeout is None:
return request()
queue = Queue(maxsize=1) # stores the result or exception
thread = Thread(target=_thread_target, args=(request, queue))
thread.start()
thread.join(timeout)
if thread.is_alive():
raise TimeoutInterrupt()
success, result = queue.get()
if success:
return result
else:
raise result[0].with_traceback(result[1], result[2])
def run_with_timeout_and_stack(request, timeout):
'''
interrupts evaluation after a given time period. provides a suitable stack environment.
'''
# only use set_thread_stack_size if max recursion depth was changed via the environment variable
# MATHICS_MAX_RECURSION_DEPTH. if it is set, we always use a thread, even if timeout is None, in
# order to be able to set the thread stack size.
if MAX_RECURSION_DEPTH > settings.DEFAULT_MAX_RECURSION_DEPTH:
set_thread_stack_size(python_stack_size(MAX_RECURSION_DEPTH))
elif timeout is None:
return request()
queue = Queue(maxsize=1) # stores the result or exception
thread = Thread(target=_thread_target, args=(request, queue))
thread.start()
thread.join(timeout)
if thread.is_alive():
raise TimeoutInterrupt()
success, result = queue.get()
if success:
return result
else:
six.reraise(*result)
def run_with_timeout_and_stack(request, timeout, evaluation):
"""
interrupts evaluation after a given time period. Provides a suitable stack environment.
"""
# only use set_thread_stack_size if max recursion depth was changed via the environment variable
# MATHICS_MAX_RECURSION_DEPTH. if it is set, we always use a thread, even if timeout is None, in
# order to be able to set the thread stack size.
if MAX_RECURSION_DEPTH > settings.DEFAULT_MAX_RECURSION_DEPTH:
set_thread_stack_size(python_stack_size(MAX_RECURSION_DEPTH))
elif timeout is None:
return request()
queue = Queue(maxsize=1) # stores the result or exception
thread = Thread(target=_thread_target, args=(request, queue))
thread.start()
# Thead join(timeout) can leave zombie threads (we are the parent)
# when a time out occurs, but the thread hasn't terminated. See
# https://docs.python.org/3/library/multiprocessing.shared_memory.html
# for a detailed discussion of this.
#
# To reduce this problem, we make use of specific properties of
# the Mathics evaluator: if we set "evaluation.timeout", the
# next call to "Expression.evaluate" in the thread will finish it
# immediately.
#
# However this still will not terminate long-running processes
# in Sympy or or libraries called by Mathics that might hang or run
# for a long time.
thread.join(timeout)
if thread.is_alive():
evaluation.timeout = True
while thread.is_alive():
pass
evaluation.timeout = False
evaluation.stopped = False
raise TimeoutInterrupt()
success, result = queue.get()
if success:
return result
else:
raise result[0].with_traceback(result[1], result[2])