major design changes: use glib event loop for MIDI thread/UI; rework design of BaseUI and AbstractUI; solo & mute are both temporarily broken; OSC control up next; may segfault during exit

git-svn-id: svn://localhost/ardour2/branches/3.0@6328 d708f5d6-7413-0410-9779-e7cbd77b26cf

1 files changed, 98 insertions, 0 deletions

diff --git a/libs/pbd/crossthread.cc b/libs/pbd/crossthread.cc
new file mode 100644
index 0000000000..1465505b56
--- /dev/null
+++ b/libs/pbd/crossthread.cc
@@ -0,0 +1,98 @@
+/*
+    Copyright (C) 2009 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 <cstdlib>
+#include <cerrno>
+#include <cstring>
+#include <fcntl.h>
+#include <unistd.h>
+
+#include "pbd/error.h"
+#include "pbd/crossthread.h"
+
+using namespace std;
+using namespace PBD;
+using namespace Glib;
+
+CrossThreadChannel::CrossThreadChannel ()
+{
+	fds[0] = -1;
+	fds[1] = -1;
+
+	if (pipe (fds)) {
+		error << "cannot create x-thread pipe for read (%2)" << ::strerror (errno) << endmsg;
+		return;
+	}
+
+	if (fcntl (fds[0], F_SETFL, O_NONBLOCK)) {
+		error << "cannot set non-blocking mode for x-thread pipe (read) (" << ::strerror (errno) << ')' << endmsg;
+		return;
+	}
+
+	if (fcntl (fds[1], F_SETFL, O_NONBLOCK)) {
+		error << "cannot set non-blocking mode for x-thread pipe (write) (%2)" << ::strerror (errno) << ')' << endmsg;
+		return;
+	}
+
+}
+
+CrossThreadChannel::~CrossThreadChannel ()
+{
+	_ios->destroy ();
+
+	if (fds[0] >= 0) {
+		close (fds[0]);
+		fds[0] = -1;
+	} 
+
+	if (fds[1] >= 0) {
+		close (fds[1]);
+		fds[1] = -1;
+	} 
+}
+
+void
+CrossThreadChannel::wakeup ()
+{
+	char c = 0;
+	::write (fds[1], &c, 1);
+}
+
+RefPtr<IOSource>
+CrossThreadChannel::ios () 
+{
+	if (!_ios) {
+		_ios = IOSource::create (fds[0], IOCondition(IO_IN|IO_PRI|IO_ERR|IO_HUP|IO_NVAL));
+	}
+	return _ios;
+}
+	
+void
+CrossThreadChannel::drain ()
+{
+	drain (fds[0]);
+}
+
+void
+CrossThreadChannel::drain (int fd)
+{
+	/* drain selectable fd */
+	char buf[64];
+	while (::read (fd, buf, sizeof (buf)) > 0);
+}