samba.git/lib/tevent, branch talloc-2.4.2

Use python.h from libreplace

2023-11-20T15:37:33+00:00

BUG: https://bugzilla.samba.org/show_bug.cgi?id=15513

Signed-off-by: Andreas Schneider 
Reviewed-by: Andrew Bartlett

tevent: Fix code spelling

2023-10-25T22:23:37+00:00

Signed-off-by: Joseph Sutton 
Reviewed-by: Andrew Bartlett

tevent: version 0.16.0

2023-10-13T10:45:51+00:00

- the epoll backend is no longer limited to 2 event handlers
  per low level fd.
- finally add support for TEVENT_FD_ERROR

Signed-off-by: Stefan Metzmacher 
Reviewed-by: Ralph Boehme 

Autobuild-User(master): Ralph Böhme 
Autobuild-Date(master): Fri Oct 13 10:45:51 UTC 2023 on atb-devel-224

tevent: add support for TEVENT_FD_ERROR

2023-10-13T09:49:33+00:00

After 12 years we finally got TEVENT_FD_ERROR support :-)

TEVENT_FD_WRITE event handlers never get errors reported
instead the event handler is silently disabled.
There are likely callers relying on that behavior, so
we are not able to chance it.

Now TEVENT_FD_WRITE can be used together with TEVENT_FD_ERROR
in order to get errors reported without waiting for TEVENT_FD_READ.

TEVENT_FD_ERROR can also be used alone in order to detect errors
on sockets in order to cleanup resources.

Signed-off-by: Stefan Metzmacher 
Reviewed-by: Ralph Boehme

tevent: add test_event_fd3

2023-10-13T09:49:33+00:00

The tests the interaction of multiple event handlers on
the same low level fd.

It shows that poll and epoll backends behave in the
same fair way.

Signed-off-by: Stefan Metzmacher 
Reviewed-by: Ralph Boehme

tevent: add test_fd_speed3

2023-10-13T09:49:33+00:00

Signed-off-by: Stefan Metzmacher 
Reviewed-by: Ralph Boehme

tevent: let tevent_epoll.c use new generic mpx infrastructure

2023-10-13T09:49:33+00:00

This allows any number of event handlers per low level fd.

It means the epoll backend behaves like the poll backend now.

Signed-off-by: Stefan Metzmacher 
Reviewed-by: Ralph Boehme

tevent: add tevent_common_fd_mpx infrastructure

2023-10-13T09:49:33+00:00

Backends may require to map individual tevent_fd instances to
a single low level kernel state (e.g. for epoll).

This generic infrastructure adds helper functions using
a generic (sub)part of struct tevent_fd.

The new code will allow us to support more than 2 tevent_fd
instances per fd, which makes sure all backends can provide
a similar behavior. This will be important when we add
TEVENT_FD_ERROR as a 3rd kind of fd event.

The aim is to use this in order to replace the limited implementation
we already have in tevent_epoll.c.

As these helpers are typically called from within
'void tevent_fd_set_flags(struct tevent_fd *fde, uint16_t flags)'
there's no way to report errors. So in order avoid additional
error handling complexity the helpers try to avoid
any allocations which may fail. It also means the logic in
tevent_epoll.c doesn't have to change much.

These are implemented as static line functions in order to avoid
the function call overhead, which showed up in profiles of the
early implementation.

Signed-off-by: Stefan Metzmacher 
Reviewed-by: Ralph Boehme

tevent: split out a tevent_common_fd_disarm() helper

2023-10-13T09:49:33+00:00

It means tevent_trace_fd_callback(TEVENT_EVENT_TRACE_DETACH)
is always called and similar future changes are only
needed in one place.

Signed-off-by: Stefan Metzmacher 
Reviewed-by: Ralph Boehme

tevent: introduce DLIST_DEMOTE_SHORT()

2023-10-13T09:49:33+00:00

It turns out that the overhead of DLIST_DEMOTE() implemented
as DLIST_REMOVE();DLIST_ADD_END(), is very high if the list
contains only 1 or 2 elements.

The next commits will make use of DLIST_DEMOTE_SHORT() for
multiplexing multiple tevent_fd structures for a single fd
and the most important and common case is a list with just
one element.

Signed-off-by: Stefan Metzmacher 
Reviewed-by: Ralph Boehme