kopia lustrzana https://github.com/micropython/micropython
58 wiersze
1.3 KiB
ReStructuredText
58 wiersze
1.3 KiB
ReStructuredText
:mod:`select` -- wait for events on a set of streams
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========================================================================
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.. module:: select
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:synopsis: wait for events on a set of streams
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This module provides functions to wait for events on streams (select streams
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which are ready for operations).
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Pyboard specifics
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-----------------
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Polling is an efficient way of waiting for read/write activity on multiple
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objects. Current objects that support polling are: :class:`pyb.UART`,
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:class:`pyb.USB_VCP`.
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Functions
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---------
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.. function:: poll()
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Create an instance of the Poll class.
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.. function:: select(rlist, wlist, xlist[, timeout])
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Wait for activity on a set of objects.
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This function is provided for compatibility and is not efficient. Usage
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of :class:`Poll` is recommended instead.
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.. _class: Poll
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class ``Poll``
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--------------
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Methods
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~~~~~~~
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.. method:: poll.register(obj[, eventmask])
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Register ``obj`` for polling. ``eventmask`` is 1 for read, 2 for
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write, 3 for read-write.
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.. method:: poll.unregister(obj)
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Unregister ``obj`` from polling.
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.. method:: poll.modify(obj, eventmask)
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Modify the ``eventmask`` for ``obj``.
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.. method:: poll.poll([timeout])
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Wait for at least one of the registered objects to become ready. Returns
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list of ready objects, or empty list on timeout.
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Timeout is in milliseconds.
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