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# -*- test-case-name: twisted.internet.test.test_default -*-
# Copyright (c) Twisted Matrix Laboratories.
# See LICENSE for details.
"""
The most suitable default reactor for the current platform.
Depending on a specific application's needs, some other reactor may in
fact be better.
"""
__all__ = ["install"]
from twisted.python.runtime import platform
def _getInstallFunction(platform):
"""
Return a function to install the reactor most suited for the given platform.
@param platform: The platform for which to select a reactor.
@type platform: L{twisted.python.runtime.Platform}
@return: A zero-argument callable which will install the selected
reactor.
"""
# Linux: Once <http://twistedmatrix.com/trac/ticket/4429> is fixed
# epoll should be the default.
#
# OS X: poll(2) is not exposed by Python because it doesn't
# support all file descriptors (in particular, lack of PTY support
# is a problem) -- see <http://bugs.python.org/issue5154>. kqueue
# reactor is being rewritten (see
# <http://twistedmatrix.com/trac/ticket/1918>), and also has same
# restriction as poll(2) as far PTY support goes.
#
# Windows: IOCP should eventually be default, but still has a few
# remaining bugs,
# e.g. <http://twistedmatrix.com/trac/ticket/4667>.
#
# We therefore choose poll(2) on non-OS X POSIX platforms, and
# select(2) everywhere else.
if platform.getType() == 'posix' and not platform.isMacOSX():
from twisted.internet.pollreactor import install
else:
from twisted.internet.selectreactor import install
return install
install = _getInstallFunction(platform)