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Project Description

Interruptingcow is a generic utility can relatively gracefully interrupt your Python code when it doesn’t execute within a specific number of seconds:

from interruptingcow import timeout

try:
    with timeout(5, exception=RuntimeError):
        # perform a potentially very slow operation
        pass
except RuntimeError:
    print "didn't finish within 5 seconds"

Timeouts are specified in seconds (as floats with theoretical microsecond precision).

Installation

$ pip install interruptingcow

Reentrant

Interruptingcow is fully reentrant, which means that you can have nested timeouts:

from interruptingcow import timeout

class Outer(RuntimeError): pass

class Inner(RuntimeError): pass

try:
    with timeout(20.0, Outer):
        try:
            with timeout(1.0, Inner):
                # some expensive operation
                try_the_expensive_thing()
        except Inner:
            do_the_cheap_thing_instead()

except Outer:
    print 'Program as a whole failed to return in 20 secs'

Nested timeouts allow a large outer timeout to contain smaller timeouts. If the inner timeout is larger than the outer timeout, it is treated as a no-op.

Function Decorators

Interruptingcow can be used both as inline with-statements, as shown in the above examples, as well as function decorator:

from interruptingcow import timeout

@timeout(.5)
def foo():
    with timeout(.3):
        # some expensive operation
        pass

Caveats

Interruptingcow uses signal(SIGALRM) to let the operating system interrupt program execution. This has the following limitations:

  1. Python signal handlers only apply to the main thread, so you cannot use this from other threads
  2. You must not use this in a program that uses SIGALRM itself (this includes certain profilers)
Release History

Release History

0.6

This version

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0.5

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0.4

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0.3

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0.2

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0.1

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TODO: Figure out how to actually get changelog content.

Changelog content for this version goes here.

Donec et mollis dolor. Praesent et diam eget libero egestas mattis sit amet vitae augue. Nam tincidunt congue enim, ut porta lorem lacinia consectetur. Donec ut libero sed arcu vehicula ultricies a non tortor. Lorem ipsum dolor sit amet, consectetur adipiscing elit.

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Download Files

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File Name & Checksum SHA256 Checksum Help Version File Type Upload Date
interruptingcow-0.6.tar.gz (3.6 kB) Copy SHA256 Checksum SHA256 Source Jun 21, 2012

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