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Documented the new error_callback keyword argument to multiprocessing.Pool's apply_async and map_async

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Ask Solem 2010-11-09 21:36:56 +00:00
parent 9bc35682de
commit 1d3b89397b
1 changed files with 19 additions and 5 deletions
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24
Doc/library/multiprocessing.rst
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@ -1582,14 +1582,21 @@ with the :class:`Pool` class.
suited for performing work in parallel. Additionally, the passed in
function is only executed in one of the workers of the pool.
.. method:: apply_async(func[, args[, kwds[, callback]]])
.. method:: apply_async(func[, args[, kwds[, callback[, error_callback]]]])
A variant of the :meth:`apply` method which returns a result object.
If *callback* is specified then it should be a callable which accepts a
single argument. When the result becomes ready *callback* is applied to
it (unless the call failed). *callback* should complete immediately since
otherwise the thread which handles the results will get blocked.
it, that is unless the call failed, in which case the *error_callback*
is applied instead
If *error_callback* is specified then it should be a callable which
accepts a single argument. If the target function fails, then
the *error_callback* is called with the exception instance.
Callbacks should complete immediately since otherwise the thread which
handles the results will get blocked.
.. method:: map(func, iterable[, chunksize])
@ -1606,8 +1613,15 @@ with the :class:`Pool` class.
If *callback* is specified then it should be a callable which accepts a
single argument. When the result becomes ready *callback* is applied to
it (unless the call failed). *callback* should complete immediately since
otherwise the thread which handles the results will get blocked.
it, that is unless the call failed, in which case the *error_callback*
is applied instead
If *error_callback* is specified then it should be a callable which
accepts a single argument. If the target function fails, then
the *error_callback* is called with the exception instance.
Callbacks should complete immediately since otherwise the thread which
handles the results will get blocked.
.. method:: imap(func, iterable[, chunksize])