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GLib Reference Manual | |
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Changes to GLibChanges to GLib — Incompatible changes made between successing versions of GLib |
GLib changed the seeding algorithm for the pseudo-random number
generator Mersenne Twister, as used by GRand
and GRandom. This was necessary, because some
seeds would yield very bad pseudo-random streams. Also the
pseudo-random integers generated by
g_rand*_int_range() will have a
slightly better equal distribution with the new version of GLib.
Further information can be found at the website of the Mersenne Twister random number generator at http://www.math.keio.ac.jp/~matumoto/emt.html.
The original seeding and generation algorithms, as found in GLib
2.0.x, can be used instead of the new ones by setting the environment
variable G_RANDOM_VERSION to the value of '2.0'. Use
the GLib-2.0 algorithms only if you have sequences of numbers generated
with Glib-2.0 that you need to reproduce exactly.
The GNOME 2.0 porting guide on http://developer.gnome.org has some more detailed discussion of porting from 1.2 to 2.0. See the section on GLib.
The event loop functionality GMain has extensively been revised to support multiple separate main loops in separate threads. All sources (timeouts, idle functions, etc.) are associated with a GMainContext.
Compatibility functions exist so that most application code dealing with the main loop will continue to work. However, code that creates new custom types of sources will require modification.
The main changes here are:
Sources are now exposed as GSource *, rather than simply as numeric ids.
New types of sources are created by structure "derivation" from
GSource, so the source_data
parameter to the GSource virtual functions has been
replaced with a GSource *.
Sources are first created, then later added to a specific GMainContext.
Dispatching has been modified so both the callback and data are passed
in to the dispatch() virtual function.
To go along with this change, the vtable for
GIOChannel has changed and
add_watch() has been replaced by
create_watch().
g_list_foreach() and
g_slist_foreach() have been changed so they
are now safe against removal of the current item, not the next item.
It's not recommended to mutate the list in the callback to these functions in any case.
GDate now works in UTF-8, not in the current locale.
If you want to use it with the encoding of the locale, you need to convert
strings using g_locale_to_utf8() first.
g_strsplit() has been fixed to:
include trailing empty tokens, rather than stripping them
split into a maximum of max_tokens tokens, rather
than max_tokens + 1
Code depending on either of these bugs will need to be fixed.
Deprecated functions that got removed:
g_set_error_handler(),
g_set_warning_handler(),
g_set_message_handler(), use
g_log_set_handler() instead.