XtAppAddBlockHook(3Xt)

NAME
       XtAppAddBlockHook, XtRemoveBlockHook - register a block
       hook procedure

SYNTAX
       XtBlockHookId XtAppAddBlockHook(app_context, proc,
       client_data)
             XtAppContext app_context;
             XtBlockHookProc proc;
             XtPointer client_data;

       void XtRemoveBlockHook(idFP)
             XtBlockHookId id;

ARGUMENTS
       app_context
                 Specifies the application context.

       proc      Specifies the block hook procedure.

       num_args  Specifies the application-specific data to be
                 passed to the block hook.

DESCRIPTION
       XtAppAddBlockHook registers the specified procedure and
       returns an identifier for it.  The hook is called at any
       time in the future when the Intrinsics are about to block
       pending some input.

       Block hook procedures are removed automatically and the
       XtBlockHookId is destroyed when the application context in
       which they were added is destroyed.

       XtRemoveBlockHook removes the specified block hook proce-
       dure from the list in which it was registered.

SEE ALSO
       X Toolkit Intrinsics - C Language Interface
       Xlib - C Language X Interface