61 lines
1.7 KiB
C
61 lines
1.7 KiB
C
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/* Event pipe for GDB, the GNU debugger.
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Copyright (C) 2021-2023 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 COMMON_EVENT_PIPE_H
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#define COMMON_EVENT_PIPE_H
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/* An event pipe used as a waitable file in the event loop in place of
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some other event associated with a signal. The handler for the
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signal marks the event pipe to force a wakeup in the event loop.
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This uses the well-known self-pipe trick. */
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class event_pipe
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{
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public:
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event_pipe() = default;
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~event_pipe();
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DISABLE_COPY_AND_ASSIGN (event_pipe);
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/* Create a new pipe. */
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bool open_pipe ();
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/* Close the pipe. */
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void close_pipe ();
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/* True if the event pipe has been opened. */
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bool is_open () const
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{ return m_fds[0] != -1; }
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/* The file descriptor of the waitable file to use in the event
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loop. */
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int event_fd () const
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{ return m_fds[0]; }
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/* Flush the event pipe. */
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void flush ();
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/* Put something in the pipe, so the event loop wakes up. */
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void mark ();
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private:
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int m_fds[2] = { -1, -1 };
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};
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#endif /* COMMON_EVENT_PIPE_H */
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