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Adds new tracing API to trace fd, timer, signal and immediate events
on specific trace points: attach, before handler and dettach.
This can be used in combination with the event tag to keep track
of the currently executed event for purpose of debugging.
Pair-Programmed-With: Stefan Metzmacher <metze@samba.org>
Signed-off-by: Pavel Březina <pbrezina@redhat.com>
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Andreas Schneider <asn@samba.org>
Adds a new API to set and get an uint64_t tag on fd, timer, signal and
immediate events. This can be used to assign a unique and known id to
the event to allow easy tracking of such event.
Pair-Programmed-With: Stefan Metzmacher <metze@samba.org>
Signed-off-by: Pavel Březina <pbrezina@redhat.com>
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Andreas Schneider <asn@samba.org>
This allows detailed reporting where a tevent_req spends its time
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Stefan Metzmacher <metze@samba.org>
This allows to specify wrapper tevent_contexts, which adds the ability
to run functions before and after the event handler functions.
This can be used to implement impersonation hooks
or advanced debugging/profiling hooks.
We'll undo the 0.9.36 ABI change on the 0.9.37 release
at the end of this patchset.
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>
We'll undo the 0.9.36 ABI change on the 0.9.37 release
at the end of this patchset.
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>
We'll undo the 0.9.36 ABI change on the 0.9.37 release
at the end of this patchset.
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>
As side effect this avoids tricks with an extra
tevent_common_timed_deny_destructor().
We'll undo the 0.9.36 ABI change on the 0.9.37 release
at the end of this patchset.
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>
As side effect this avoids tricks with tevent_se_exists_destructor() to
figure out if the event handler removed itself.
We'll undo the 0.9.36 ABI change on the 0.9.37 release
at the end of this patchset.
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>
This will be used to generically support TALLOC_FREE() on
event which are currently running.
It aborts on every explicit talloc_free(), but ignores implicit
cleanup when the talloc parent is about to go.
We'll undo the 0.9.36 ABI change on the 0.9.37 release
at the end of this patchset.
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>
We'll undo the 0.9.36 ABI change on the 0.9.37 release
at the end of this patchset.
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>
The following patches will rely on having all valid fd events in
ev->fd_events, even if they are temporary disabled with
tevent_set_fd_flags(fde, 0);
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>
We don't need to store it. I prefer this as it shows that we must always
get wakeup_fd from the event context at time of use, rather than possibly
storing an out-of-date variable.
Signed-off-by: Jeremy Allison <jra@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>
Autobuild-User(master): Ralph Böhme <slow@samba.org>
Autobuild-Date(master): Fri Nov 17 12:43:01 CET 2017 on sn-devel-144
select() is no longer useful on modern systems.
Signed-off-by: Jeremy Allison <jra@samba.org>
Reviewed-by: Volker Lendecke <vl@samba.org>
Autobuild-User(master): Volker Lendecke <vl@samba.org>
Autobuild-Date(master): Sat Sep 16 08:35:39 CEST 2017 on sn-devel-144
I did not find a way to do this safely without a mutex per threaded_context.
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
This prepares tevent run-down with active threads.
It has the advantage to not depend on talloc'ed structs. It is needed to make
talloc_free(tevent_context) safe when tevent_threaded_contexts are still
around.
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
This makes the reading end of the signalling pipe special: If we have eventfd,
this is the same as the write fd. Without eventfd, it will have to be a
separate fd. This moves the requirement to #ifdef from the writing end to the
reading end. Why? We'll use the writing end somewhere else too soon, and this
patch avoids an #ifdef in that new place.
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
According to the manpage, eventfd is cheaper than a pipe. At least, we can save
a file descriptor and space for it in struct tevent_context :-)
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
No functionality change. This just looks better in objdump --disassemble :-)
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
This is infrastructure to improve our async r/w result handling and latency.
The pthreadpool signalling goes through a pipe. This has downsides: The main
event loop has to go through a read on the pipe before it can ship the result.
Also, it is not guaranteed by poll/epoll that the pthreadpool signal pipe is
handled with top priority. When an async pread/pwrite has finished, we should
immediately ship the result to the client, not waiting for anything else.
This patch enables tevent_immediate structs as job signalling. This means a
busy main tevent loop will handle the threaded job completion before any timed
or file descriptor events. Opposite to Jeremy's tevent_thread_proxy this is
done by a modification of the main event loop by looking at a linked list under
a central mutex.
Regarding performance: In a later commit I've created a test that does nothing
but fire one immediate over and over again. If you add a phread_mutex_lock and
unlock pair in the immediate handler, you lose roughly 25% of rounds per
second, so it is measurable. It is questionable that will be measurable in the
real world, but to counter concerns activation of immediates needs to go
through a new struct tevent_threaded_context. Only if such a
tevent_threaded_context exists for a tevent context, the main loop takes the
hit to look at the mutex'ed list of finished jobs.
This patch by design does not care about talloc hierarchies. The idea is that
the main thread owning the tevent context creates a chunk of memory and
prepares the tevent_immediate indication job completion. The main thread hands
the memory chunk together with the immediate as a job description over to a
helper thread. The helper thread does its job and upon completion calls
tevent_threaded_schedule_immediate with the already-prepared immediate. From
that point on memory ownership is again transferred to the main thread.
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
Signalling the main event loop will also happen from threads soon, and
that will use the same mechanism. This also keeps the pipe open after the last
signal handler is removed. Threaded jobs will come and go very frequently, and
always setting up and tearing down the pipe for each job will be expensive.
Also, this is "just" two file descriptors, and with eventfd just one.
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
Signed-off-by: Jeremy Allison <jra@samba.org>
Reviewed-by: David Disseldorp <ddiss@samba.org>
Autobuild-User(master): David Disseldorp <ddiss@samba.org>
Autobuild-Date(master): Sun Feb 15 23:25:07 CET 2015 on sn-devel-104
Note that some callers used their own destructor for their
tevent_req instance, they'll just overwrite this,
which is not intended, but works without problems.
The intended way is to specify a cleanup function
and handle the TEVENT_REQ_RECEIVED state as destructor.
Note that the TEVENT_REQ_RECEIVED cleanup event might
be triggered by an explicit tevent_req_received()
in the _recv() function. The TEVENT_REQ_RECEIVED event
is only triggered once as tevent_req_received()
will remove the destructor.
So the difference compared to a custom destructor
is that the struct tevent_req itself can continue
to be there, while tevent_req_received() removed
all internal state.
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Volker Lendecke <vl@samba.org>
Such events were used before we had immediate events.
It's likely that there're a lot of this events
and we need to add new ones in fifo order.
The tricky part is that tevent_common_add_timer()
should not use the optimization as it's used
by broken Samba versions, which don't use
tevent_common_loop_timer_delay() in source3/lib/events.c.
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
Not yet used, but will be called by the "standard"
fallback from epoll -> poll backends.
Signed-off-by: Jeremy Allison <jra@samba.org>
Reviewed-by: Stefan Metzmacher <metze@samba.org>
Returns an event ops struct given a string name. Not
yet used, but will be part of the new "standard" fallback
code.
Signed-off-by: Jeremy Allison <jra@samba.org>
Reviewed-by: Stefan Metzmacher <metze@samba.org>
Can be set externally, allows us to fallback if epoll
fails at runtime.
Signed-off-by: Jeremy Allison <jra@samba.org>
Reviewed-by: Stefan Metzmacher <metze@samba.org>
Set/get a single callback function to be invoked at various trace
points. Define "before wait" and "after wait" trace points - more
trace points can be added later if required.
CTDB wants this to log long waits and events.
Pair-programmed-with: Amitay Isaacs <amitay@gmail.com>
Signed-off-by: Martin Schwenke <martin@meltin.net>
Signed-off-by: Stefan Metzmacher <metze@samba.org>
I don't know if this is a problem in real life.
The code assumes there's only one tevent_context; all signals will notify
the first event context. That's counter-intuitive if you ever use more
than one, and there's nothing else in this code which prevents it AFAICT.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
move publicly needed structures and functions in the public header.
Stop installing internal headers.
Update the signature and exports files with the new exposed
function.
This is very useful to find bugs.
You can use 'p *req' in gdb to show where
tevent_req_done(), tevent_req_error() or tevent_req_nomem()
was called.
metze
Move struct tevent_req in tevent_internal, and ad getters and setters
for private data and the callback function.
This patch also renames 'private_state' into 'data'. What is held in this
pointer is in fact data and not a state like enum tevent_req_state.
Calling it 'state' is confusing.
The functions addedd are:
tevent_req_set_callback() - sets req->async.fn and req->async.private_data
tevent_req_set_print_fn() - sets req->private_print
tevent_req_callback_data() - gets req->async.private_data
tevent_req_data() - gets rea->data
This way it is much simpler to keep API/ABI compatibility in the future.
