1 /* Serial interface for a selectable event.
2 Copyright (C) 2016-2019 Free Software Foundation, Inc.
4 This file is part of GDB.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program. If not, see <http://www.gnu.org/licenses/>. */
22 /* This is used to be able to signal the event loop (or any other
23 select/poll) of events, in a race-free manner.
25 For example, a signal handler can defer non-async-signal-safe work
26 to the event loop, by having the signal handler set a struct
27 serial_event object, and having the event loop wait for that same
28 object to the readable. Once readable, the event loop breaks out
29 of select/poll and calls a registered callback that does the
34 /* Make a new serial_event object. */
35 struct serial_event
*make_serial_event (void);
37 /* Return the FD that can be used by select/poll to wait for the
38 event. The only valid operation on this object is to wait until it
40 extern int serial_event_fd (struct serial_event
*event
);
42 /* Set the event. This signals the file descriptor returned by
43 serial_event_fd as readable. */
44 extern void serial_event_set (struct serial_event
*event
);
46 /* Clear the event. The file descriptor returned by serial_event_fd
47 is not longer readable after this, until a new serial_event_set
49 extern void serial_event_clear (struct serial_event
*event
);
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