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Clarify the meaning of the select() parameters and sync 

names with docstring.
This commit is contained in:
Georg Brandl 2008-08-04 07:31:50 +00:00
parent 40df8ecdd5
commit e7829a5b1b
1 changed files with 18 additions and 12 deletions
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30
Doc/library/select.rst
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@ -58,19 +58,24 @@ The module defines the following:
.. versionadded:: 2.6
.. function:: select(iwtd, owtd, ewtd[, timeout])
.. function:: select(rlist, wlist, xlist[, timeout])
This is a straightforward interface to the Unix :cfunc:`select` system call.
The first three arguments are sequences of 'waitable objects': either
integers representing file descriptors or objects with a parameterless method
named :meth:`fileno` returning such an integer. The three sequences of
waitable objects are for input, output and 'exceptional conditions',
respectively. Empty sequences are allowed, but acceptance of three empty
sequences is platform-dependent. (It is known to work on Unix but not on
Windows.) The optional *timeout* argument specifies a time-out as a floating
point number in seconds. When the *timeout* argument is omitted the function
blocks until at least one file descriptor is ready. A time-out value of zero
specifies a poll and never blocks.
named :meth:`fileno` returning such an integer:
* *rlist*: wait until ready for reading
* *wlist*: wait until ready for writing
* *xlist*: wait for an "exceptional condition" (see the manual page for what
your system considers such a condition)
Empty sequences are allowed, but acceptance of three empty sequences is
platform-dependent. (It is known to work on Unix but not on Windows.) The
optional *timeout* argument specifies a time-out as a floating point number
in seconds. When the *timeout* argument is omitted the function blocks until
at least one file descriptor is ready. A time-out value of zero specifies a
poll and never blocks.
The return value is a triple of lists of objects that are ready: subsets of the
first three arguments. When the time-out is reached without a file descriptor
@ -90,9 +95,10 @@ The module defines the following:
.. index:: single: WinSock
File objects on Windows are not acceptable, but sockets are. On Windows, the
underlying :cfunc:`select` function is provided by the WinSock library, and does
not handle file descriptors that don't originate from WinSock.
File objects on Windows are not acceptable, but sockets are. On Windows,
the underlying :cfunc:`select` function is provided by the WinSock
library, and does not handle file descriptors that don't originate from
WinSock.
.. _epoll-objects: