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livetrax/libs/pbd/base_ui.cc
Paul Davis 68e943265e merge from 2.0-ongoing @ 3581
git-svn-id: svn://localhost/ardour2/branches/3.0@3711 d708f5d6-7413-0410-9779-e7cbd77b26cf
2008-09-10 15:03:30 +00:00

110 lines
2.4 KiB
C++

/*
Copyright (C) 2000-2007 Paul Davis
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <cstring>
#include <stdint.h>
#include <unistd.h>
#include <fcntl.h>
#include <cerrno>
#include <cstring>
#include <pbd/base_ui.h>
#include <pbd/error.h>
#include <pbd/compose.h>
#include <pbd/failed_constructor.h>
#include "i18n.h"
using namespace std;
using namespace PBD;
uint32_t BaseUI::rt_bit = 1;
BaseUI::RequestType BaseUI::CallSlot = BaseUI::new_request_type();
BaseUI::BaseUI (string str, bool with_signal_pipe)
: _name (str)
{
/* odd pseudo-singleton semantics */
base_ui_instance = this;
signal_pipe[0] = -1;
signal_pipe[1] = -1;
if (with_signal_pipe) {
if (setup_signal_pipe ()) {
throw failed_constructor ();
}
}
}
BaseUI::~BaseUI()
{
if (signal_pipe[0] >= 0) {
close (signal_pipe[0]);
}
if (signal_pipe[1] >= 0) {
close (signal_pipe[1]);
}
}
BaseUI::RequestType
BaseUI::new_request_type ()
{
RequestType rt;
/* XXX catch out-of-range */
rt = RequestType (rt_bit);
rt_bit <<= 1;
return rt;
}
int
BaseUI::setup_signal_pipe ()
{
/* setup the pipe that other threads send us notifications/requests
through.
*/
if (pipe (signal_pipe)) {
error << string_compose (_("%1-UI: cannot create error signal pipe (%2)"), _name, ::strerror (errno))
<< endmsg;
return -1;
}
if (fcntl (signal_pipe[0], F_SETFL, O_NONBLOCK)) {
error << string_compose (_("%1-UI: cannot set O_NONBLOCK on signal read pipe (%2)"), _name, ::strerror (errno))
<< endmsg;
return -1;
}
if (fcntl (signal_pipe[1], F_SETFL, O_NONBLOCK)) {
error << string_compose (_("%1-UI: cannot set O_NONBLOCK on signal write pipe (%2)"), _name, ::strerror (errno))
<< endmsg;
return -1;
}
return 0;
}