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Only tevent_loop_once and tevent_loop_until() should care
about the nesting level.
This fixes the samba3 printing code where we use tevent_loop_wait()
and don't allow nested events.
We still call the nesting hook for all levels, we need to decide
if we really want this...
metze
The event nesting code never triggered as nesting.level was never
greater than 1. The main event loop needs to increase the nesting
level by 1.
I also added a paranoia check to the nesting setup call. The API as
currently written cannot support multiple nesting hooks, so we need to
abort if multiple hooks are tried.
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
This makes the logic much simpler for the callers,
and matches the samba3 behavior.
If needed we can add performance tunning for tevent_loop_wait()
later.
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.
It makes no sense to support aio events because,
the current implementation was based on IOCB_CMD_EPOLL_WAIT
which never made it into the main kernel tree.
The native linux aio can be used with select/epoll
using eventfd(), which means we can implement aio
with fd events and implement aio outside of tevent.
metze
