new platform specific crossthreadchannel files

1 files changed, 68 insertions, 0 deletions

diff --git a/libs/pbd/crossthread.posix.cc b/libs/pbd/crossthread.posix.cc
new file mode 100644
index 0000000000..44205e680d
--- /dev/null
+++ b/libs/pbd/crossthread.posix.cc
@@ -0,0 +1,68 @@
+CrossThreadChannel::CrossThreadChannel (bool non_blocking)
+        : receive_channel (0)
+{
+	fds[0] = -1;
+	fds[1] = -1;
+
+	if (pipe (fds)) {
+		error << "cannot create x-thread pipe for read (%2)" << ::strerror (errno) << endmsg;
+		return;
+	}
+
+	if (non_blocking) {
+		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;
+		}
+	}
+
+        receive_channel = g_io_channel_unix_new (fds[0]);
+}
+
+CrossThreadChannel::~CrossThreadChannel ()
+{
+        if (receive_channel) {
+                g_io_channel_unref (receive_channel);
+        }
+
+	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;
+	(void) ::write (fds[1], &c, 1);
+}
+
+void
+CrossThreadChannel::drain ()
+{
+	char buf[64];
+	while (::read (fds[0], buf, sizeof (buf)) > 0) {};
+}
+
+int
+CrossThreadChannel::deliver (char msg)
+{
+        return ::write (fds[1], &msg, 1);
+}
+
+int 
+CrossThreadChannel::receive (char& msg)
+{
+        return ::read (fds[0], &msg, 1);
+}