#include "pbd/libpbd_visibility.h"
#ifdef PLATFORM_WINDOWS
-#include <Windows.h>
+#include <windows.h>
#endif // PLATFORM_WINDOWS
*/
class LIBPBD_API CrossThreadChannel {
- public:
+public:
/** if @a non_blocking is true, the channel will not cause blocking
* when used in an event loop based on poll/select or the glib main
* loop.
* because there is no way to know which byte value will be used
* for ::wakeup()
*/
- int deliver (char msg);
+ int deliver (char msg);
/** if using ::deliver() to wakeup the listening thread, then
* the listener should call ::receive() to fetch the message
* type from the channel.
+ *
+ * wait = true only make sense for non_blocking channels,
+ * it polls for data to become available.
*/
- int receive (char& msg);
+ int receive (char& msg, bool wait = false);
/** empty the channel of all requests.
* Typically this is done as soon as input
*/
void drain ();
- void set_receive_handler (sigc::slot<bool,Glib::IOCondition> s);
- void attach (Glib::RefPtr<Glib::MainContext>);
+ void set_receive_handler (sigc::slot<bool,Glib::IOCondition> s);
+ void attach (Glib::RefPtr<Glib::MainContext>);
private:
friend gboolean cross_thread_channel_call_receive_slot (GIOChannel*, GIOCondition condition, void *data);
GIOChannel* receive_channel;
- GSource* receive_source;
- sigc::slot<bool,Glib::IOCondition> receive_slot;
+ GSource* receive_source;
+ sigc::slot<bool,Glib::IOCondition> receive_slot;
+
+ bool poll_for_request();
#ifndef PLATFORM_WINDOWS
int fds[2]; // current implementation uses a pipe/fifo