57 lines
1.9 KiB
Python
57 lines
1.9 KiB
Python
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# -*- test-case-name: twisted.internet.test.test_default -*-
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# Copyright (c) Twisted Matrix Laboratories.
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# See LICENSE for details.
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"""
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The most suitable default reactor for the current platform.
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Depending on a specific application's needs, some other reactor may in
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fact be better.
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"""
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from __future__ import division, absolute_import
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__all__ = ["install"]
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from twisted.python.runtime import platform
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def _getInstallFunction(platform):
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"""
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Return a function to install the reactor most suited for the given platform.
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@param platform: The platform for which to select a reactor.
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@type platform: L{twisted.python.runtime.Platform}
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@return: A zero-argument callable which will install the selected
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reactor.
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"""
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# Linux: epoll(7) is the default, since it scales well.
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#
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# OS X: poll(2) is not exposed by Python because it doesn't support all
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# file descriptors (in particular, lack of PTY support is a problem) --
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# see <http://bugs.python.org/issue5154>. kqueue has the same restrictions
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# as poll(2) as far PTY support goes.
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#
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# Windows: IOCP should eventually be default, but still has some serious
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# bugs, e.g. <http://twistedmatrix.com/trac/ticket/4667>.
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#
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# We therefore choose epoll(7) on Linux, poll(2) on other non-OS X POSIX
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# platforms, and select(2) everywhere else.
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try:
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if platform.isLinux():
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try:
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from twisted.internet.epollreactor import install
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except ImportError:
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from twisted.internet.pollreactor import install
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elif platform.getType() == 'posix' and not platform.isMacOSX():
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from twisted.internet.pollreactor import install
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else:
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from twisted.internet.selectreactor import install
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except ImportError:
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from twisted.internet.selectreactor import install
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return install
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install = _getInstallFunction(platform)
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