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* linux-nat.c (enum sigchld_state): Delete.
(linux_nat_async_events_state): Delete.
(struct waitpid_result): Delete.
(waitpid_queue): Delete.
(queued_waitpid_1): Delete.
(async_file_flush): New.
(queued_waitpid, push_waitpid): Delete.
(async_file_mark): New.
(drain_queued_events): Delete.
(my_waitpid): Remove locally queued events handling.
(linux_test_for_tracefork): Upjust.
(linux_child_follow_fork): Ditto.
(sync_sigchld_action): Delete.
(blocked_mask): Reinstate.
(async_sigchld_action): Rename to...
(sigchld_action): ... this.
(block_child_signals): New.
(restore_child_signals_mask): New.
(lin_lwp_attach_lwp): Adjust.
(linux_nat_create_inferior): Ditto.
(linux_nat_attach): Also use lp->status in async mode.
(get_pending_status): Don't use queued_waitpid.
(linux_nat_detach): Don't drain locally queued events.
(linux_nat_resume): Allow pending wait statuses stored lp->status
in async mode. If returning early due to a pending event,
re-register the event source.
(stop_wait_callback): Allow pending wait statuses stored
lp->status in async mode.
(pipe_to_local_event_queue, local_event_queue_to_pipe): Delete.
(linux_nat_wait): Rename to ...
(linux_nat_wait_1): ... this. Allow pending wait statuses stored
lp->status in async mode. Always add WNOHANG to the waitpid
options in async mode.
(linux_nat_wait): New.
(kill_callback): Don't drain locally queued events.
(sigchld_handler): Rewrite.
(linux_nat_is_async_p, linux_nat_can_async_p): Fix comments to
refer to "set target-async".
(linux_nat_async_mask): If in non-stop, and re-enabling async
mode, re-register the target event source in the event loop.
(linux_nat_event_pipe_pop, linux_nat_event_pipe_push)
(get_pending_events, async_sigchld_handler)
(linux_nat_async_events): Delete.
(handle_target_event): New.
(linux_nat_async_file_handler): Delete.
(linux_async_pipe): New.
(linux_nat_async): Only re-register in the event loop if not
registered yet. Always notify the event-loop once if enabling the
event source.
(linux_nat_stop_lwp): Rewrite to handle pending events stored in
lp->status, not in the locally queued event list.
(linux_nat_stop): Don't mask out async event handling.
(linux_nat_setup_async): Delete.
(_initialize_linux_nat): Adjust.
(lin_thread_get_thread_signals): blocked_mask is global again.
Adjust.