static void
log_writer_start_watches(LogWriter *self)
{
gint fd;
GIOCondition cond;
if (!self->watches_running)
{
log_proto_prepare(self->proto, &fd, &cond);
if (self->pollable_state < 0)
{
if (is_file_regular(fd))
self->pollable_state = 0;
else
self->pollable_state = iv_fd_pollable(fd);
}
if (self->pollable_state)
{
self->fd_watch.fd = fd;
iv_fd_register(&self->fd_watch);
}
log_writer_update_watches(self);
self->watches_running = TRUE;
}
}
static void
log_writer_start_watches(LogWriter *self)
{
gint fd;
GIOCondition cond;
if (self->watches_running)
return;
log_proto_client_prepare(self->proto, &fd, &cond);
self->fd_watch.fd = fd;
if (self->pollable_state < 0)
{
if (is_file_regular(fd))
self->pollable_state = 0;
else
self->pollable_state = !iv_fd_register_try(&self->fd_watch);
}
else if (self->pollable_state > 0)
iv_fd_register(&self->fd_watch);
log_writer_update_watches(self);
self->watches_running = TRUE;
}
static void
log_writer_queue_filled(gpointer s)
{
LogWriter *self = (LogWriter *) s;
main_loop_assert_main_thread();
/*
* NOTE: This theory is somewhat questionable, e.g. I'm not 100% sure it
* is the right scenario, but the race was closed. So take this with a
* grain of salt.
*
* The queue_filled callback is running in the main thread. Because of the
* possible delay caused by iv_event_post() the callback might be
* delivered event after stop_watches() has been called.
*
* - log_writer_schedule_update_watches() is called by the reader
* thread, which calls iv_event_post()
* - the main thread calls stop_watches() in work_perform
* - the event is delivered in the main thread
*
* But since stop/start watches always run in the main thread and we do
* too, we can check if this is the case. A LogWriter without watches
* running is busy writing out data to the destination, e.g. a
* start_watches is to be expected once log_writer_work_finished() is run
* at the end of the deferred work, executed by the I/O threads.
*/
if (self->watches_running)
log_writer_update_watches((LogWriter *) s);
}
static void
log_writer_io_error(gpointer s)
{
LogWriter *self = (LogWriter *) s;
if (self->fd_watch.handler_out == NULL && self->fd_watch.handler_in == NULL)
{
msg_debug("POLLERR occurred while idle",
evt_tag_int("fd", log_proto_client_get_fd(self->proto)));
log_writer_broken(self, NC_WRITE_ERROR);
return;
}
else
{
/* in case we have an error state but we also asked for read/write
* polling, the error should be handled by the I/O callback. But we
* need not call that explicitly as ivykis does that for us. */
}
log_writer_update_watches(self);
}