derek.holloway
7502bf64a4
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52 lines
2.0 KiB
C
52 lines
2.0 KiB
C
/* Serial interface for a selectable event.
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Copyright (C) 2016-2024 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#ifndef GDB_SER_EVENT_H
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#define GDB_SER_EVENT_H
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/* This is used to be able to signal the event loop (or any other
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select/poll) of events, in a race-free manner.
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For example, a signal handler can defer non-async-signal-safe work
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to the event loop, by having the signal handler set a struct
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serial_event object, and having the event loop wait for that same
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object to the readable. Once readable, the event loop breaks out
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of select/poll and calls a registered callback that does the
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deferred work. */
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struct serial_event;
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/* Make a new serial_event object. */
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struct serial_event *make_serial_event (void);
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/* Return the FD that can be used by select/poll to wait for the
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event. The only valid operation on this object is to wait until it
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is readable. */
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extern int serial_event_fd (struct serial_event *event);
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/* Set the event. This signals the file descriptor returned by
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serial_event_fd as readable. */
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extern void serial_event_set (struct serial_event *event);
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/* Clear the event. The file descriptor returned by serial_event_fd
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is not longer readable after this, until a new serial_event_set
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call is made. */
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extern void serial_event_clear (struct serial_event *event);
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#endif /* GDB_SER_EVENT_H */
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