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Optimisation. Up to now new fd_set was initialised in
each signaler_wait call. Now the fd_set is initialised
once when signaler is created. This is useful espacially on
Windows where fd_set is list of pointers rather than bitset
and thus can be rather large.
Signed-off-by: Martin Sustrik <sustrik@250bpm.com>
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This patch propoagates the error from signaler and mailbox
initialisation up the stack.
To achieve this signaler and mailbox classes were re-written
is C-like syntax.
Finally, shutdown_stress test now ignores EMFILE/ENFILE errors.
Thus, the tests should pass even on OSX which sets the max
number of file descriptors pretty low by default.
Signed-off-by: Martin Sustrik <sustrik@250bpm.com>
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Signed-off-by: Martin Sustrik <sustrik@250bpm.com>
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Signed-off-by: Martin Sustrik <sustrik@250bpm.com>
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Signed-off-by: Martin Sustrik <sustrik@250bpm.com>
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Signed-off-by: Martin Sustrik <sustrik@250bpm.com>
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Eventfd (on Linux) is more efficient that socketpair
for passing simple signals.
Signed-off-by: Martin Sustrik <sustrik@250bpm.com>
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Storing commands in OS socket buffers caused whole lot of
problems when free space in the buffer ran out. This patch
stores commands in ypipes instead and uses socketpair just
to signal the other thread, ie. at most one byte is stored
in the socketpair at any single instant.
Signed-off-by: Martin Sustrik <sustrik@250bpm.com>
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For historical reasons queue to transfer commands between
threads was called 'signaler'. Given that it was used to
pass commands rather than signals it was renamed to 'mailbox',
see Erlang mailboxes.
Signed-off-by: Martin Sustrik <sustrik@250bpm.com>
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If the socketpair used by signaler_t fills up, this can lead to deadlock.
This patch provides partial resolution by attempting to resize SO_SNDBUF on
the writer side, and if that fails we shall at least assert rather than
hang.
I've also refactored the signaler_t code to make the platform-dependent
parts clearer and have tested both the MSG_DONTWAIT and standard POSIX path
in recv.
The Win32 implementation currently does not implement resizing as I'm not
convinced that it's safe, but it will also assert like other platforms if
signaler_t::send() cannot succeed.
The OpenVMS implementation has been carried forward but is untested.
Signed-off-by: Martin Lucina <mato@kotelna.sk>
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Signed-off-by: Martin Sustrik <sustrik@250bpm.com>
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