1 files changed, 89 insertions, 0 deletions
diff --git a/otherlibs/labltk/support/cltkWait.c b/otherlibs/labltk/support/cltkWait.c
new file mode 100644
index 000000000..7645dd931
--- /dev/null
+++ b/otherlibs/labltk/support/cltkWait.c
@@ -0,0 +1,89 @@
+#include <tcl.h>
+#include <tk.h>
+#include <caml/mlvalues.h>
+#include <caml/memory.h>
+#include "camltk.h"
+
+/* The following are replacements for 
+    tkwait visibility
+    tkwait window
+   in the case where we use threads (tkwait internally calls an event loop,
+   and thus prevents thread scheduling from taking place).
+
+   Instead, one should set up a callback, wait for a signal, and signal 
+   from inside the callback
+*/
+
+static void		WaitVisibilityProc _ANSI_ARGS_((ClientData clientData,
+			    XEvent *eventPtr));
+static void		WaitWindowProc _ANSI_ARGS_((ClientData clientData,
+			    XEvent *eventPtr));
+
+/* For the other handlers, we need a bit more data */
+struct WinCBData {
+  int cbid;
+  Tk_Window win;
+};
+
+static void WaitVisibilityProc(clientData, eventPtr)
+    ClientData clientData;	
+    XEvent *eventPtr;		/* Information about event (not used). */
+{
+  struct WinCBData *vis = clientData;
+  value cbid = Val_int(vis->cbid);
+
+  Tk_DeleteEventHandler(vis->win, VisibilityChangeMask,
+	    WaitVisibilityProc, clientData);
+
+  stat_free((char *)vis);
+  callback2(*handler_code,cbid,Val_int(0));
+}
+
+/* Sets up a callback upon Visibility of a window */
+value camltk_wait_vis(win,cbid) /* ML */
+     value win;
+     value cbid;
+{
+  struct WinCBData *vis =
+    (struct WinCBData *)stat_alloc(sizeof(struct WinCBData));
+  vis->win = Tk_NameToWindow(cltclinterp, String_val(win), cltk_mainWindow);
+  if (vis -> win == NULL) {
+    stat_free((char *)vis);
+    tk_error(cltclinterp->result);
+  };
+  vis->cbid = Int_val(cbid);
+  Tk_CreateEventHandler(vis->win, VisibilityChangeMask,
+			WaitVisibilityProc, (ClientData) vis);
+  return Val_unit;
+}
+
+static void WaitWindowProc(clientData, eventPtr)
+    ClientData clientData;	
+    XEvent *eventPtr;		
+{
+  if (eventPtr->type == DestroyNotify) {
+    struct WinCBData *vis = clientData;
+    value cbid = Val_int(vis->cbid);
+    stat_free((char *)clientData);
+    /* The handler is destroyed by Tk itself */
+    callback2(*handler_code,cbid,Val_int(0));
+  }
+}
+
+/* Sets up a callback upon window destruction */
+value camltk_wait_des(win,cbid) /* ML */
+     value win;
+     value cbid;
+{
+  struct WinCBData *vis =
+    (struct WinCBData *)stat_alloc(sizeof(struct WinCBData));
+  vis->win = Tk_NameToWindow(cltclinterp, String_val(win), cltk_mainWindow);
+  if (vis -> win == NULL) {
+    stat_free((char *)vis);
+    tk_error(cltclinterp->result);
+  };
+  vis->cbid = Int_val(cbid);
+  Tk_CreateEventHandler(vis->win, StructureNotifyMask,
+			WaitWindowProc, (ClientData) vis);
+  return Val_unit;
+}