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includes a new EVENT_FD_AUTOCLOSE flag that prevents race conditions
where code using fd events might close a fd before releasing the
struct fd_event. That causes headaches for epoll.
(This used to be commit f1ad216de13b154a1f8747a44b0970dcc47a784a)
- if someone adds a timed_event with a zero timeval
we now avoid serval gettimeofday() calls and the
event handler doesn't get the current time when it's
called, instead we also pass a zero timeval
- this also makes sure multiple timed events with a zero timeval
are processed in the order there're added.
the little benchmark shows that processing 2000000 directly timed events
is now much faster, while avoiding syscalls at all!
> time ./evtest (with the old code)
real 0m6.388s
user 0m1.740s
sys 0m4.632s
> time ./evtest (with the new code)
real 0m1.498s
user 0m1.496s
sys 0m0.004s
metze@SERNOX:~/devel/samba/4.0/samba4-ci/source> cat evtest.c
#include <stdio.h>
#include <stdint.h>
#include <sys/time.h>
#include <talloc.h>
#include <events.h>
static void dummy_fde_handler(struct event_context *ev_ctx, struct fd_event *fde,
uint16_t flags, void *private_data)
{
}
static void timeout_handler(struct event_context *ev, struct timed_event *te,
struct timeval tval, void *private_data)
{
uint32_t *countp = (uint32_t *)private_data;
(*countp)++;
if (*countp > 2000000) exit(0);
event_add_timed(ev, ev, tval, timeout_handler, countp);
}
int main(void)
{
struct event_context *ev;
struct timeval tval = { 0, 0 };
uint32_t count = 0;
ev = event_context_init(NULL);
event_add_fd(ev, ev, 0, 0, dummy_fde_handler, NULL);
event_add_timed(ev, ev, tval, timeout_handler, &count);
return event_loop_wait(ev);
}
(This used to be commit 4db64b4ce2320b88d648078cbf86385f6fb44f1f)
This also adds some more headers to the list that is installed and a couple of extra #include lines so these
headers can be used externally without problems.
(This used to be commit 07652f65ce7a5b19130f1a27cbf0e1e5fae13454)
event context is created. This allows the LOCAL-EVENT test to pass on
systems with have libaio but not the necessary kernel patches
(This used to be commit 2ff8abf0022824e6ae93019ee1b3391e651a8ee7)
If this happens:
- two sockets are readable, and select/epoll/aio returns both of
them
- read event on socket1 is called
- inside that read event an event_loop_once is called, this returns that
socket2 is readable
- read event on socket2 is called
- event_loop_once returns
- top level event handler then calls read event on socket2 (as it
still has that listed as readable)
- read handler for socket2 returns zero byte read, which is
interpreted as end of file
- socket is incorrectly closed
this happened with ctdb, but it could happen anywhere (just
rarely). The fix is trivial - ensure we break out of the event loop
when we have been called recursively.
(This used to be commit e042002bb5ee8974220e1ade56b64389571f75a6)
I think this happens when both are eventual children of the autofree context.
(Trying to track down a valgrind error on fort).
Andrew Bartlett
(This used to be commit aee751497ca738fa0de72dd0748590a74d5af2fd)
This also reduces the static data in the signal backend when not using
signals to 4 bytes.
(This used to be commit 071a6e8eb1861b10b8a7aa61470f21a546ffa0ca)
add support for sa_flags argument to event_add_signal(). These are
passed to sigaction(). Special handling is provided for SA_RESETHAND
(which tells the event system to remove the handler after the signal)
and SA_SIGINFO which allows the siginfo structure to be received per
signal
(This used to be commit 1bb10b6cf7d717ad21834e73a4ca4b22b5fb6f0a)
Jeremy asked for this to allow Samba3 to use the Samba4 events library
see torture/local/event.c for an example
(This used to be commit 7e105482ff9a3da6b4708ff99a64f1881614fc5f)
- fix epoll configure checks for the epoll and aio
events backends
- we should only activate the epoll backend if sys/epoll.h
and epoll_create() are found
- we should only activate the aio backend if sys/epoll.h, epoll_create(),
libaio.h and io_getevents() are found
hopefully fix the build on 'bnhtest' in the build farm...
metze
(This used to be commit d46a5efb03ea1df50567cad00e1589870cdb31fe)
- make it easier to plug in a new events backend
- add simpler 'select' and 'epoll' backends
This is part of the effort to add good AIO support. The events_aio.c
backend is done, but sometimes dies with a SEGV, which is why it isn't
enabled yet.
(This used to be commit 934f18283dbc7958944931a93a854526bcd54884)
epoll. It is not linked in anywhere yet - I'm committing it in case
anyone else wants to have a look at it.
The concept is quite strange really, but it seems to be the only way
that Linux 2.6.x can currently use a unified event model allowing for
AIO events and socket events to be waited for by a single unified
event wait function. You setup a epoll system, then setup a weird aio
event that points at the epoll system, then use io_getevents() to
actually do the waiting.
I'm hoping that kevents or a proper integration of epoll will allow us
to avoid ths rather hackish scheme, but meanwhile this is the only
path to proper AIO in Samba on Linux (without a horrible signals mess)
(NOTE: this code requires some kernel patches to work at the moment)
(This used to be commit 195051fdee341e8d8cb76e5c91dcc0f6c246a870)
* Move dlinklist.h, smb.h to subsystem-specific directories
* Clean up ads.h and move what is left of it to dsdb/
(only place where it's used)
(This used to be commit f7afa1cb77f3cfa7020b57de12e6003db7cfcc42)
the difference between these at all, and in the future the
fact that INIT_OBJ_FILES include smb_build.h will be sufficient to
have recompiles at the right time.
(This used to be commit b24f2583edee38abafa58578d8b5c4b43e517def)
for the case where, epoll isn't available at compile time
- only pass the private std_event_context, to the local function,
to get rid of the talloc_get_type() calls
- use the private pointer to std_event_context_init() to decide if we want to
disable epoll at runtime
metze
(This used to be commit de322ea8b761df5434e60879b7eae3796ea68007)
the events backend can store private flags
- add function to access the gtk event loop ops struct
metze
(This used to be commit a5cc0758a393f36a770cdd57e317214d03934c13)
for it pending.
Also fix a bug with timed events: Don't call the same event recursively in the
handler's inner semi-async event loop.
Volker
(This used to be commit e38e50127a3414461578421e676a9c58c106c272)
the events code replaces a destructor to one that returns allways -1
while it's calling the event handler
- we don't need the composite and winsrepl specific fixes any more
- this also fixes the problem with smbcli, dcerpc, cldap, ldap and nbt
request timeouts
metze
(This used to be commit 495996cfc49a1c6eefde6ff04fc75e0739be3aab)
but final linking still fails (as does generating files asn1, et, idl and proto
files)
(This used to be commit 4f0d7f75b99c7f4388d8acb0838577d86baf68b5)
