Move PBD::canonical_path to pbd/file_utils.h/cc and reimplement for Windows

[ardour.git] / libs / pbd / pbd / crossthread.h

diff --git a/libs/pbd/pbd/crossthread.h b/libs/pbd/pbd/crossthread.h
index d172c9c60f65933df348e3130ab8ea74210b5d75..e87879e4a31bb9a36698b1f71cc9548919be8c43 100644 (file)
--- a/libs/pbd/pbd/crossthread.h
+++ b/libs/pbd/pbd/crossthread.h
@@ -1,5 +1,5 @@
 /*
-    Copyright (C) 2000-2007 Paul Davis 
+    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
@@ -28,28 +28,33 @@
 
 #include "pbd/libpbd_visibility.h"
 
+#ifdef PLATFORM_WINDOWS
+#include <windows.h>
+#endif // PLATFORM_WINDOWS
+
+
 /** A simple abstraction of a mechanism of signalling one thread from another.
  * The signaller calls ::wakeup() to tell the signalled thread to check for
- * work to be done. 
+ * work to be done.
  *
  * This implementation provides both ::selectable() for use in direct
  * poll/select-based event loops, and a Glib::IOSource via ::ios() for use
- * in Glib main loop based situations. 
+ * in Glib main loop based situations.
  */
 
-class LIBPBD_API CrossThreadChannel { 
-  public:
+class LIBPBD_API CrossThreadChannel {
+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.
         */
        CrossThreadChannel(bool non_blocking);
        ~CrossThreadChannel();
-       
+
        /** Tell the listening thread that is has work to do.
         */
        void wakeup();
-       
+
        /* if the listening thread cares about the precise message
         * it is being sent, then ::deliver() can be used to send
         * a single byte message rather than a simple wakeup. These
@@ -57,49 +62,47 @@ class LIBPBD_API CrossThreadChannel {
         * 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 
+        * Typically this is done as soon as input
         * is noticed on the channel, because the
         * handler will look at a separately managed work
         * queue. The actual number of queued "wakeups"
         * in the channel will not be important.
         */
        void drain ();
-       static void drain (int fd);
 
-       /** File descriptor that can be used with poll/select to
-        * detect when wakeup() has been called on this channel.
-        * It be marked as readable/input-ready when this condition
-        * is true. It has already been marked non-blocking.
-        */
-       int selectable() const { return fds[0]; }
-
-       /* glibmm 2.22 and earlier has a terrifying bug that will
-          cause crashes whenever a Source is removed from
-          a MainContext (including the destruction of the MainContext),
-          because the Source is destroyed "out from under the nose of" 
-          the RefPtr. I (Paul) have fixed this (https://bugzilla.gnome.org/show_bug.cgi?id=561885)
-          but in the meantime, we need a hack to get around the issue.
-       */
-       Glib::RefPtr<Glib::IOSource> ios();
-       void drop_ios ();
-
-       /** returns true if the CrossThreadChannel was
-        * correctly constructed.
-        */
-       bool ok() const { return fds[0] >= 0 && fds[1] >= 0; }
+       void set_receive_handler (sigc::slot<bool,Glib::IOCondition> s);
+       void attach (Glib::RefPtr<Glib::MainContext>);
 
-  private:
-       Glib::RefPtr<Glib::IOSource>* _ios; // lazily constructed
+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;
+
+       bool poll_for_request();
+
+#ifndef PLATFORM_WINDOWS
        int fds[2]; // current implementation uses a pipe/fifo
+#else
+
+       SOCKET send_socket;
+       SOCKET receive_socket;
+       struct sockaddr_in recv_address;
+#endif
+
 };
 
 #endif /* __pbd__crossthread_h__ */