02cfe41bff
git-svn-id: svn://localhost/ardour2/branches/3.0@9276 d708f5d6-7413-0410-9779-e7cbd77b26cf
121 lines
2.4 KiB
C++
121 lines
2.4 KiB
C++
/*
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Copyright (C) 2009 Paul Davis
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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 2 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, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <cstdlib>
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#include <cerrno>
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#include <cstring>
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#include <fcntl.h>
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#include <unistd.h>
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#include "pbd/error.h"
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#include "pbd/crossthread.h"
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using namespace std;
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using namespace PBD;
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using namespace Glib;
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CrossThreadChannel::CrossThreadChannel (bool non_blocking)
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{
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_ios = 0;
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fds[0] = -1;
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fds[1] = -1;
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if (pipe (fds)) {
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error << "cannot create x-thread pipe for read (%2)" << ::strerror (errno) << endmsg;
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return;
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}
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if (non_blocking) {
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if (fcntl (fds[0], F_SETFL, O_NONBLOCK)) {
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error << "cannot set non-blocking mode for x-thread pipe (read) (" << ::strerror (errno) << ')' << endmsg;
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return;
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}
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if (fcntl (fds[1], F_SETFL, O_NONBLOCK)) {
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error << "cannot set non-blocking mode for x-thread pipe (write) (%2)" << ::strerror (errno) << ')' << endmsg;
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return;
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}
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}
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}
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CrossThreadChannel::~CrossThreadChannel ()
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{
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/* glibmm hack */
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drop_ios ();
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if (fds[0] >= 0) {
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close (fds[0]);
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fds[0] = -1;
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}
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if (fds[1] >= 0) {
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close (fds[1]);
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fds[1] = -1;
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}
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}
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void
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CrossThreadChannel::wakeup ()
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{
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char c = 0;
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(void) ::write (fds[1], &c, 1);
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}
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RefPtr<IOSource>
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CrossThreadChannel::ios ()
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{
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if (!_ios) {
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_ios = new RefPtr<IOSource> (IOSource::create (fds[0], IOCondition(IO_IN|IO_PRI|IO_ERR|IO_HUP|IO_NVAL)));
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}
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return *_ios;
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}
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void
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CrossThreadChannel::drop_ios ()
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{
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delete _ios;
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_ios = 0;
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}
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void
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CrossThreadChannel::drain ()
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{
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drain (fds[0]);
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}
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void
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CrossThreadChannel::drain (int fd)
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{
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/* drain selectable fd */
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char buf[64];
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while (::read (fd, buf, sizeof (buf)) > 0);
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}
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int
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CrossThreadChannel::deliver (char msg)
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{
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return ::write (fds[1], &msg, 1);
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}
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int
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CrossThreadChannel::receive (char& msg)
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{
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return ::read (fds[0], &msg, 1);
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}
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