We previously hold a lock in the loop that collects the arguments for
g_signal_emit(), which we drop before calling into the argument
collection functions and reacquire again at the bottom of the loop (ie:
one release/acquire pair for each argument collected). To make matters
worse, the lock is just released again after the loop.
Presumably that was done to protect the access to the parameter array,
but it's pretty unlikely that this is needed because the only way it
changes is if the signal is unloaded. That only happens when unloading
types which is quite unlikely to happen while we are emitting on an
instance of that type (and, as an aside, never happens anymore anyway).
If we move the unlock below the loop up above it and remove the
acquire/release pair from the loop, we improve performance in the new
arg-collecting performance tests by ~15% (more like ~18% in the case
where we only emit to one handler -- where argument collection dominates
more).
https://bugzilla.gnome.org/show_bug.cgi?id=694380
Back in the far-off twentieth century, it was normal on unix
workstations for U+0060 GRAVE ACCENT to be drawn as "‛" and for U+0027
APOSTROPHE to be drawn as "’". This led to the convention of using
them as poor-man's ‛smart quotes’ in ASCII-only text.
However, "'" is now universally drawn as a vertical line, and "`" at a
45-degree angle, making them an `odd couple' when used together.
Unfortunately, there are lots of very old strings in glib, and also
lots of new strings in which people have kept up the old tradition,
perhaps entirely unaware that it used to not look stupid.
Fix this by just using 'dumb quotes' everywhere.
https://bugzilla.gnome.org/show_bug.cgi?id=700746
When looking up signals by name (to connect, for example) and the named
signal cannot be found on the given instance, report the type of the
instance.
This is quite a lot more useful as a diagnostic message than only a
memory address.
https://bugzilla.gnome.org/show_bug.cgi?id=694350
We need to keep a reference to the handler in the fast path, just like
in the slow path, otherwise if another thread disconnects the handler
we may destroy the closure while we're using it without the lock held.
We also move the freeing of the instance to after the emission is totally
done as the handler_unref_R (and the tracepoint) reference it.
https://bugzilla.gnome.org/show_bug.cgi?id=694253
handler_ref and handler_unref_R are always called with the signal
lock held. This is obvious for handler_unref_R as it even sometimes
drops this lock, and can be verified quickly for handler_ref by looking
at all call sites.
This improves the performace about 6% on the emit-handled and the
emit-handled-generic tests.
https://bugzilla.gnome.org/show_bug.cgi?id=694253
This is the bug that has been causing segfaults and criticals when accel
keys are used to close windows via GtkUIManager.
The main cause of this problem was a mistake made in the original patch
when modifying the handler_lookup() to take the extra 'closure'
parameter. The original check used was:
if (handler->sequential_number == handler_id ||
(closure && handler->closure == closure))
It was called to find a particular closure like so:
handler_lookup (instance, 0, closure, &signal_id);
The problem is that the check will return if either the signal ID or
closure matches (if a closure was given). The calling code assumes 0 to
be an invalid signal ID which will match no handlers, but unfortunately
the rest of gsignal code uses this to denote a signal that has already
been disconnected. The result is that this function was searching for a
matching closure _or_ the first already-disconnected handler. When it
found the already-disconnected handler, we'd get criticals and crashes.
The condition has been corrected; it now ignores the handler_id
parameter if the closure parameter is non-NULL.
While we're in here, change the lifecycle of the invalidation notify to
be easier to understand.
Before, the notify was removed when the last reference on the handler
dropped. This could happen in very many situations; often at the end of
an emission. Instead, we now tie the registration of the notifier to
the lifecycle of the signal connection. When the signal is disconnected
we remove the notification, even if other references are held (eg:
because it is currently being dispatched).
https://bugzilla.gnome.org/show_bug.cgi?id=690118
Modify gsignal to automatically disconnect a GClosure that becomes
invalid (in the g_closure_invalidate() sense).
Previously, when g_signal_connect_object() was used with a GObject as
the user_data and that object was destroyed, the handler would no longer
be called but the signal handler was itself was not disconnected (ie:
the bookkeeping data was kept around).
The main effect of this patch is that these signal handlers will now
be automatically disconnected (and fully freed).
The documentation for g_signal_connect_object() has anticipated this
change for over 10 years and has advised the following workaround when
disconnecting signal handlers connected with g_signal_connect_object():
if (g_signal_handler_is_connected (instance, id))
g_signal_handler_disconnect (instance, id);
If your code follows this practice then it will continue to work.
If your code never disconnects the signal handler then it was wasting
memory before (and this commit fixes that).
If your code unconditionally disconnects the signal handler then you
will start to see (harmless) g_critical() warnings about this and you
should fix them.
https://bugzilla.gnome.org/show_bug.cgi?id=118536
If the optimization is used for only having one closure handling a
signal emission, then hooks will not be run, so it should be disabled
when an emission hook is added.
https://bugzilla.gnome.org/show_bug.cgi?id=671918
The trace of the signal emission of the was calculating the instance
type after the instance was unrefed. Fix this by keeping the instance type around.
When there is only one closure handling a signal emission and
it doesn't have a bunch of complicated features enabled we
can short circuit the va_args collection into GValues and call the
callback via the va_marshaller directly.
https://bugzilla.gnome.org/show_bug.cgi?id=661140
If the signal argumment types matches a built in standard
marshaller we use the va_marshaller for that, and also the
normal marshaller if NULL was specified (as its faster than
the generic one).
This lets you set a va_marshaller on your signal which will be
propagated to all closures for the signal. Also, automatically
uses the generica va_marshaller if you specify a NULL c_marshaller.
https://bugzilla.gnome.org/show_bug.cgi?id=661140
This means we're not abusing the notifiers for meta_marshallres,
and we're able to later cleanly add other fields to GClosure.
We still have to leave the ABI intact for the GClosure->meta_marshal
bit, as old G_CLOSURE_N_NOTIFIERS macro instances still accesses it.
However, we always set it to zero to keep those macros working.
https://bugzilla.gnome.org/show_bug.cgi?id=661140
Similar to G_PARAM_DEPRECATED. It will warn only for users of the
signals, so a signal can still be emited without warning, for
compatibility reasons.
Apparently, there is no way user flags could have been used before,
so that shouldn't break anyone.
https://bugzilla.gnome.org/show_bug.cgi?id=663581
To help cross compilation, don't use glib-genmarshal in our
build. This is easy now that we have g_cclosure_marshal_generic().
In gobject/, add gmarshal.[ch] to git (making the existing entry
points stubs).
In gio/, simply switch to using g_cclosure_marshal_generic().
https://bugzilla.gnome.org/show_bug.cgi?id=652168
In some cases, signal arguments have to be collected, even if there are i
no signal handlers connected (e.g. for GVariant parameters, where collection
consumes a floating variant).
Based on a patch by Christian Persch.
Bug #643624.
This adds static markers and systemtap tapsets for:
* type creation
* object lifetimes (creation, ref, unref, dispose, finalize)
* signal creation and emission
Signal emissions and finalization marker have a corresponding
*_end (or *-end in dtrace) version that is when the corresponding
operation is finished.
https://bugzilla.gnome.org/show_bug.cgi?id=606044
The reason we need to enforce this is that the GTypeValueTable
documentation explicitly states that memory is memset to 0 when the
value_init function is called.
https://bugzilla.gnome.org/show_bug.cgi?id=603590
Makes g_signal_emit_valist from 15% to 20% faster.
Results reported from profiling the pan newsreader which uses a variant
of simple and complex signal emissions (i.e no args or various args)
https://bugzilla.gnome.org/show_bug.cgi?id=603590
2009-03-13 Kristian Rietveld <kris@imendio.com>
* gsignal.c (signal_lookup_closure): when defaulting to the only
item in the array, check if this is indeed the default closure.
(patch by Tim Janik).
svn path=/trunk/; revision=7979
2008-07-21 Michael Natterer <mitch@imendio.com>
Reviewed by Tim Janik:
* gsignal.c (g_signal_chain_from_overridden_handler): allocate
the temp GValue array with GSLice.
(g_signal_emit_valist): dito. Remove optimization/obfuscation of
allocating up to 16 GValues on the stack and always use GSLice.
svn path=/trunk/; revision=7229
2008-07-04 Michael Natterer <mitch@imendio.com>
Bug 541208 – Functions to easily install and use signals without
class struct slot
* gobject.symbols
* gsignal.[ch] (g_signal_new_class_handler): the same as
_gtk_binding_signal_new(), to install signals with a callback
instead of a class struct slot as class closure.
The next two functions are C convenience and much easier to use
than the generic overriding and chaining APIs which are intended
primarily for language bindings:
(g_signal_override_class_handler): to override a signal with a
callback instead of a class struct slot.
(g_signal_chain_from_overridden_handler): to chain up from a
signal without class struct slot. The API is similar to
g_signal_emit().
svn path=/trunk/; revision=7157
2008-06-22 Michael Natterer <mitch@imendio.com>
* *.c: remove trailing whitespace from newly added gtk-doc
comments and reformatted some where they contained overly long or
ill-formatted lines.
svn path=/trunk/; revision=7090
2008-06-22 Michael Natterer <mitch@imendio.com>
* *.c: moved includes back to the top of the files (before gtk-doc
SECTION comments). Add "config.h" in all files and move system
included before glib includes. Remove trailing whitespace from
SECTION comments and did some reformatting where lines were overly
long, no documentation content was changed.
svn path=/trunk/; revision=7089
2007-08-14 Cody Russell <bratsche@gnome.org>
* gobject/gsignal.c: g_type_default_interface_ref() was not
ensuring working g_signal_list_ids. Added checks for
!G_TYPE_IS_INTERFACE (itype).
(#465625, by some guy who calls himself Yeti)
svn path=/trunk/; revision=5704
2005-12-30 Matthias Clasen <mclasen@redhat.com>
* gsignal.c: Remove the handler trash stack, which
is now unused.
(g_signal_init): Remove the restriction that HandlerMatch
must be the same size as GList, and obsolete comments
referring to mem chunks.
Tue Nov 1 16:24:20 2005 Tim Janik <timj@imendio.com>
* glib/gmem.[hc]: prepared deprecation of GMemChunk and GAllocator.
added g_slice_*() API to allocate and cache small bits of memory.
an actuall allocator implementation for g_slice_*() is still pending.
* glib/gthread.[hc]: changes from a patch by Matthias Clasen.
changed GRealThread list to use in-structure *next; fields instead
of GSList, in order for thread iteration to not depenend on g_slice_*()
indirectly.
_g_thread_mem_private_get():
_g_thread_mem_private_set(): added accessors for private memory,
needed because the ordinary GPrivate implementation relies on GArray
and GSList and therefore indirectly on working g_slice_*() allocations.
* glib/gthread.[hc]:
g_thread_foreach(): new public API function to loop over all existing threads.
* glib/gdataset.c:
* glib/gstring.c:
* glib/gcache.c:
* glib/garray.c:
* glib/gqueue.c:
* glib/gslist.c:
* glib/glist.c:
* glib/ghash.c:
* glib/gtree.c:
* glib/ghook.c:
* glib/gmain.c:
* glib/gnode.c:
removed GAllocator and free list usages and accompanying locks.
use g_slice_*() API to allocate and cache small bits of memory.
* glib/ghook.h: removed GMemChunk field from public API.
* glib/gslist.h:
* glib/glist.h: deprecate allocator API, provide _free1() for consistency.
* glib/gnode.h: deprecate allocator API.
* glib/gmain.c: reordered GPollRec fields so g_slice_free_chain() can
be used for poll rec lists.
* glib/grel.c: removed mem chunk usage, and allocated tuples via g_slice_*().
g_relation_destroy(): free all tuples from the all_tuples hash table,
this effectively maintains the life time track keeping of tuples.
g_relation_delete_tuple(): free tuples which are removed from the
all_tuples hash table. this fixes a temporary leak that was present
in the memchunk code until the destruction of the relation.
2005-09-08 Kjartan Maraas <kmaraas@gnome.org>
* gclosure.c: (g_closure_set_meta_marshal): Remove some unused
code.
* gsignal.c: (g_signal_emitv): Same here
* gtype.c: (g_type_register_fundamental): And here
* testgobject.c: Mark some functions static.
2005-09-05 Matthias Clasen <mclasen@redhat.com>
* gsignal.c (struct _SignalNode): Make the name field const.
(g_signal_newv): Don't keep an unnecessary extra copy of the
signal name around, and don't forget to free the name if
an existing node is reused.
Sat Jul 30 21:10:26 2005 Tim Janik <timj@gtk.org>
* gobject.c: reverted notify_mutex introduction, since this prevents
parallelized setting of object properties on different objects, and
serves no apparent purpose (to me at least).
g_object_real_dispose(): removed non-atomic reference count
modifications.
g_object_unref(): make sure the closures array is destroyed when
destroying signal handlers.
* gparam.c: cosmetic changes.
* gsignal.c: comment fixup. allow 16bit blocking count.
* gsignal.c: reverted GClosure related changes.
* gclosure.c: reverted premature commit of atomic reference
counting attempt.
2005-07-15 Matthias Clasen <mclasen@redhat.com>
Make refcounting threadsafe by using atomic
operations. (#166020, Wim Taymans)
* gobject.c: Use a recursive lock to protect the
notify queue.
(g_object_unref): Get rid of g_object_last_unref and
do the last unref handling in g_object_unref.
(g_object_ref, g_object_unref): Use atomic operations.
* gsignal.c (struct _HandlerMatch): Use a full integer
for the ref_count field.
(handler_ref, handler_unref_R): Use atomic operations.
* gparam.c (g_param_spec_ref, g_param_spec_unref):
Use atomic operations instead of a lock to make the
refcounting threadsafe.
* gclosure.c (g_closure_ref, g_closure_unref): Use atomic
operations. This is more complicated here, since the
refcount is stored in a bitfield, so we also have
to access all other bitfield members atomically.
* gsignal.c (handlers_find): Read the meta_marshal flag
of the closure atomically.
* tests/Makefile.am (SUBDIRS): Add tests/refcount
* configure.in: Add tests/refcount
* tests/refcount/properties.c: Test property changes
from multiple threads.
* tests/refcount/signals.c: Test signal emission from
multiple threads.
* tests/refcount/objects.c: Test refcounting from
multiple threads.
* tests/refcount/objects2.c:
* tests/refcount/properties2.c: Tests to measure the
overhead of threadsafe refcounting.
* glib/giochannel.c (g_io_channel_ref, g_io_channel_unref):
Use atomic operations to make refcounting
threadsafe. (#166020, Wim Taymans)
2005-03-14 Matthias Clasen <mclasen@redhat.com>
* abicheck.sh: Make work again.
* gsourceclosure.c: Fix a typo.
Make PLT-reduction work with gcc4, and don't include
everything in gobjectalias.h:
* gobject.symbols: Group symbols by header and source
file.
* makegobjectalias.pl: Protect definitions by the same
preprocessor symbols used to guard the headers. Move
the alias declarations to a separate file which is
produced when calling makegalias.pl -def
* Makefile.am (gobjectaliasdef.c): Add a rule to
build this file.
* *.c: Include gobjectalias.h after the other i
GLib headers, include gobjectaliasdef.c at the bottom.
Sun Nov 28 01:37:54 2004 <timj@birnet.org>
* gsignal.c: applied patch by sven@gimp.org (#153727) to reduce
signal connection complexity from O(n_handlers) to O(1).
2004-10-04 Matthias Clasen <mclasen@redhat.com>
* gsignal.c (g_signal_add_emission_hook): Improve the warning
if G_SIGNAL_NO_HOOKS is set. (#154299, Nickolay V. Shmyrev)
2004-09-16 Matthias Clasen <mclasen@redhat.com>
Implement the same PLT reduction technique used in GTK+:
* Makefile.am: Generate gobjectalias.h from gobject.symbols.
(BUILT_SOURCES): Add gobjectalias.h.
* makegobjectalias.pl: Script to generate gobjectalias.h.
* *.c: Include gobjectalias.h
Fri Sep 12 16:31:40 2003 Owen Taylor <otaylor@redhat.com>
* gsignal.[ch]: Add g_signal_accumulator_true_handled(), to
do TRUE-stops-emit signals.
* Makefile.am: Move testoverride.c and testifaceinit.c to
tests/gobject.
Tue Aug 19 04:08:14 2003 Tim Janik <timj@gtk.org>
* gvalue.c: adapt to new gbsearcharray.h code.
(g_value_register_transform_func): turn transform function
replacement into a valid operation.
* gsignal.c: adapt to new gbsearcharray.h code.
* gboxed.c: adapt to new gbsearcharray.h code.
Mon Nov 4 14:41:48 2002 Owen Taylor <otaylor@redhat.com>
* glib/gbsearcharray.c: Include config.h
so DISABLE_MEMPOOLS actually has an effect.
(#96437, Morten Welinder)
* tests/uri-test.c: Include <config.h>
Mon Nov 4 14:42:36 2002 Owen Taylor <otaylor@redhat.com>
* gtype.c gsignal.c gvaluearray.c: Include config.h
so DISABLE_MEMPOOLS actually has an effect.
(#96437, Morten Welinder)
* gsignal.c: Conditionalize definition of g_handler_ts
on DISABLE_MEM_POOLS (#96437)
Mon Nov 4 14:45:24 2002 Owen Taylor <otaylor@redhat.com>
* gthread-posix.c gthread-solaris.c: Include <config.h>
Mon May 20 15:57:47 2002 Owen Taylor <otaylor@redhat.com>
* gsignal.c: When printing errors, handle NULL
returns from g_type_debug(). (#73559, Laszlo Peter)
* gtype.c (type_descriptive_name_I): De-inline,
since it's only used for debugging.
Tue Dec 18 21:39:57 2001 Tim Janik <timj@gtk.org>
* testoverride.c: added some assertions to test
g_signal_get_invocation_hint().
* gsignal.[hc]: remove signal_id argument from
g_signal_chain_from_overridden(), the parameters are assumed to match
the innermost signal currently in emission for this instance.
added g_signal_get_invocation_hint() to figure the invocation hint
of the innermost signal emission of an instance.
* gsignal.c (g_signal_list_ids): fix G_BSEARCH_ARRAY_NODES() to
access a bsearch array and not a pointer to it (discovered by
Sven Neumann).
Tue Nov 13 23:18:10 2001 Tim Janik <timj@gtk.org>
* gsignal.[hc]: add API for chaining:
g_signal_chain_from_overridden() and g_signal_override_class_closure(),
implementation yet to come.
* gtype.[hc], Makefile.am: provide G_LOG_DOMAIN as compile flag.
* gparam.[hc]: s/g_param_get/g_param_spec_get/ for get_nick,
get_name and get_blurb, to be consistent with the rest of the
g_param_spec_*() functions.
* gparamspecs.[hc]: got rid of bogus GClosure paramspec.
G_TYPE_CLOSURE is a boxed type already.
* .cvsignore: Add some generated files.
* glib/gmain.c: (g_main_context_iterate): Comment out cruft
after #endif to avoid gcc warning.
* gmodule/gmodule.c: (g_module_set_error_unduped): Remove
const from type to avoid gcc warning.
* gobject/gsignal.c: (g_signal_emitv): ifdef variable used
only if G_ENABLE_DEBUG to avoid gcc warning.
* gobject/gtype.c: (type_iface_vtable_init_Wm),
(type_iface_vtable_finalize_Wm): ifdef call needed only
if !G_DISABLE_ASSERT to avoid gcc warning.
* tests/testglib.c: (main): ifdef call needed only if
!G_DISABLE_ASSERT to avoid gcc warning. Maybe later we
should make the test to #undef G_DISABLE_ASSERT.
* tests/unicode-collate.c: Add include of <string.h> to
avoid gcc warning.
Thu Jun 28 16:57:44 2001 Tim Janik <timj@gtk.org>
* configure.in (GLIB_MICRO_VERSION): up version number to 1.3.7,
interface age 0, binary age 0.
Thu Jun 28 16:42:49 2001 Tim Janik <timj@gtk.org>
* gsignal.c (g_signal_lookup):
(g_signal_list_ids): give elaborate warnings about invalid types,
non-instantiatable types and unloaded types that we can't operate on.
* gparam.[hc]: g_param_spec_pool_belongings() ->
g_param_spec_pool_list_owned().
* gsignal.[hc]: renamed:
g_signal_newc -> g_signal_new
g_signal_disconnect_by_func -> g_signal_handlers_disconnect_by_func
g_signal_block_by_func -> g_signal_handlers_block_by_func
g_signal_unblock_by_func -> g_signal_handlers_unblock_by_func
added GConnectType to simplify (..gboolean swapped, gboolean after)
args.
* gobject.[hc]: changed prototypes accordingly.
Mon May 28 06:51:24 2001 Tim Janik <timj@gtk.org>
* gsignal.c (signal_emit_unlocked_R): fixed bad faux-pass, forgot
to release signal lock when restarting emissions.
Sun May 27 05:09:18 2001 Tim Janik <timj@gtk.org>
* gmain.c (g_main_context_prepare): unlock context when bailing
out with a warning.
(g_main_context_check): same here.
* gmain.c (g_main_context_check): before returning due to
changed pollfds, unlock context.
Sun May 27 04:52:28 2001 Tim Janik <timj@gtk.org>
* gsignal.[hc] (g_signal_stop_emission_by_name): added variant
to stop signal emissions through a detailed_signal string.
* gsignal.c (signal_emit_R) (g_signal_emit_valist): account for
the fact that g_value_* functions may cause signal emissons by
unlocking the global signal system lock around g_value_* functions.
(signal_emit_unlocked_R): renamed this from signal_emit_R() to reflect
that this functions acquires the lock on its own now.
Mon May 14 01:49:01 2001 Tim Janik <timj@gtk.org>
* gsignal.[hc] (g_signal_handler_is_connected): new function
to check whether a handler is still connected to an instance
(by handler id).
Sun Apr 29 00:37:34 2001 Tim Janik <timj@gtk.org>
* ghook.[hc]: made hook ids a gulong.
Sat Apr 28 23:39:42 2001 Tim Janik <timj@gtk.org>
* gsignal.[hc]: made signal handler and emission hook ids gulongs.
(signal_handlers_foreach_matched_R): only invoke callback for handlers
that are not disconnected (id>0).
(signal_emit_R): prevent invocation of signal handlers during the
emission they were connected within.
* glib-mkenums: publically installed perl-script to parse C code
enums and generate descriptions thereof.
* glib-mkenums.1: assorted man page.
Wed Apr 18 09:46:56 2001 Owen Taylor <otaylor@redhat.com>
* gobject.c gsignal.c: Change C++ comments for FIXME's to
C comments. (Patch from Andres Salomon)
Sat Mar 31 23:55:58 2001 Tim Janik <timj@gtk.org>
* gtype.h:
* gparamspecs.[hc]: applied patch from owen to implement
GParamSpecUnichar.
Fri Mar 30 07:34:02 2001 Tim Janik <timj@gtk.org>
* gtype.c (type_iface_retrive_holder_info_Wm):
* gtypeplugin.c (g_type_plugin_complete_interface_info):
* gtypemodule.c (g_type_module_complete_interface_info):
change order of instance_type and interface_type so they match
the g_type_add_interface_*() API.
* gsignal.c (g_signal_emit_valist): always assign C return value
location, people depending on unaltered return values after emissions
that had no handlers to run need to use g_signal_emitv().
* gtype.[hc] (g_type_query): new function to allow querying of
class and object size (semantics like g_signal_query()).
currently the implementation is better held conservative so as to
only support types that are classed and static.
Wed Mar 14 18:46:54 2001 Tim Janik <timj@gtk.org>
* gscanner.[hc]: removed archaic gpointer derived_data; relict and
added a GData member instead.
* glist.[hc]: added g_list_remove_all().
* gslist.[hc]: added g_slist_remove_all().
Sat Mar 17 23:18:36 2001 Tim Janik <timj@gtk.org>
* gobject.c (g_object_get_property): minor bug-fix.
* gbsearcharray.[hc]: provide a macro for static initialization and
functions g_bsearch_array_new() and g_bsearch_array_destroy() for
dynamic allocations.
* gboxed.c: introduce G_TYPE_GSTRING, boxed type for GString.
* gclosure.[hc]: naming corrections.
Fri Mar 9 16:42:08 2001 Tim Janik <timj@gtk.org>
* gvaluetypes.[hc]: moved g_strdup_value_contents() into this file as
a public function (was static in gobject.c before). it's a bit odd
to have that function here, especially since it requires extra includes,
but then it doesn't very well fit somewhere else either.
* gparamspecs.c: added default/max/min checks to param spec creation
functions.
Fri Mar 9 14:57:17 2001 Tim Janik <timj@gtk.org>
* testgruntime.c: test program. covers run first/last/cleanup signal
handlers, return value accumulator, signal string returns, and
interface types in signal arguments.
* gtype.c (g_type_value_table_peek): for interface types without
value table, try looking up a value table from an instantiatable
prerequisite type (this is safe as an interface may only have
one instantiatable prerequisiste).
(type_check_is_value_type_U): same here.
* gsignal.c (g_signal_newv): assert that return types never have
G_SIGNAL_TYPE_STATIC_SCOPE set.
(g_signal_newc): only create class closure if the class_offset is not
0.
