Error converting a pipe (Handler) to fd on vs 2003 to use with g_io_channel_win32_new_fd


I am trying to use notify a main gtk thread ( from a separate thread)
that some even occurred using pipes. I get the following warning when
I am trying to setup pipes. What is a good workaround?

when I can this g_io_channel_win32_new_fd, I see this warning, and
thus pipe isn't created at all :(

GLib-WARNING **: giowin32.c:1564: 3 isn't a C library file descriptor

    int fds[2];
    GIOChannel* gioChannels[2];
    HANDLE rdPipe, wrPipe;

    saAttr.nLength = sizeof(SECURITY_ATTRIBUTES);
    saAttr.bInheritHandle = TRUE;
    saAttr.lpSecurityDescriptor = NULL;
    if (CreatePipe(&rdPipe, &wrPipe, NULL, 1024))
       fds[0]  =_open_osfhandle((gssize)rdPipe,  O_RDONLY);
       fds[1] = _open_osfhandle((long)wrPipe,_O_APPEND);

       gioChannels[0] =g_io_channel_win32_new_fd(fds[0] );
       gioChannels[1] =g_io_channel_win32_new_fd(fds[0] );

       g_io_add_watch( gioChannels[1],(GIOCondition) (G_IO_IN |
                        (GIOFunc)SomeCallaback,(gpointer)this );


The goal is to notify main application that something occurred in
thread thread. In my case, I can't use gtk in multi-threaded way
(calling functions of main thread from spawned one), so I am trying to
do it via pipes.

I also saw that it could be a visual studio issue in this thread

Any suggestions? 
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