Re: request reversion regarding scm_i_* removal

[Andy Wingo <wingo@pobox.com>]

Good day!

Still on holiday, but the train provides a lovely hacktime.

On Mon 11 Aug 2008 01:10, ludo@gnu.org (Ludovic Courtès) writes:

> Andy Wingo <wingo@pobox.com> writes:
>
>> The removal of the scm_i_* functions is an ABI break in the stable 1.8
>> series. It should be reverted. (It's a great fix for master though.)
>
> The "i" always stood for "internal", but let's see what can be done...
> ;-)

Yeah, I know. Bad me. (And others, of course.) But I don't think "We
told you so" is a good reason to change within a stable series -- and
in this particular case I don't think its cost is worth its benefits.

I do think it's a super fix for master, though! :)

> I don't mind leaving `scm_i_symbol_length ()' public for the sake of ABI
> compatibility, just like `scm_i_string_chars ()' and a few others.
>
> Eventually, application code should have a configure check, allowing it
> to use either `_i_' or `_c_'.

Yeah, I agree.

>> but more seriously the port table, with the
>> scm_i_port_table_mutex. (The port API sucks, I know.)
>
> What do you mean?  What code outside `libguile' uses
> `scm_i_port_table_mutex'?

Guile-gnome does, when registering a new port type, for gnome-vfs. The
port API isn't threadsafe, and also sucks as I mentioned ;) From
gnome-vfs/gnome/gw/gnome-vfs-port.c:

#define LOCK scm_i_pthread_mutex_lock (&scm_i_port_table_mutex)
#define UNLOCK scm_i_pthread_mutex_unlock (&scm_i_port_table_mutex)

    SCM 
    scm_gnome_vfs_handle_to_port (GnomeVFSHandle *handle, GnomeVFSOpenMode mode,
                                  const gchar* uri)
    #define FUNC_NAME "scm_gnome_vfs_handle_to_port"
    {
        long mode_bits = vfs_mode_bits (mode);
        SCM port;
        scm_t_port *pt;

        LOCK;

        port = scm_new_port_table_entry (scm_tc16_vport);
        SCM_SET_CELL_TYPE(port, scm_tc16_vport | mode_bits);
        pt = SCM_PTAB_ENTRY(port);
        pt->rw_random = mode & GNOME_VFS_OPEN_RANDOM;
        SCM_SETSTREAM (port, handle);
        if (mode_bits & SCM_BUF0)
            scm_vport_buffer_add (port, 0, 0);
        else
            scm_vport_buffer_add (port, -1, -1);
        SCM_SET_FILENAME (port, scm_makfrom0str (uri));

        UNLOCK;

        return port;
    }
    #undef FUNC_NAME

Also there's the bit in the flush() vfunc about scm_i_terminating.
Nastiness all around.

Regards,

Andy
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