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3c53fb8790
The type system should have never been relegated to libgobject: it's a low level API to register types at run time. Having GType inside libglib allows us to use the type system information everywhere: - generic but type safe storage data types - explicit memory management semantics for all data types - enumeration types for all flags Having the type system inside libglib also allows us to create new and better fundamental types in the future, like sum types, option types, tuples, and generic types. Moved: - gatomicarray - gboxed - genums - gtype - gtypeplugin - gvalue The move is mostly Git surgery, but given the amount of internal API surface, it results in a single commit to avoid breaking bisectability. We need to maintain `gobject/gvaluecollector.h` as a publicly installed header but, to avoid issues in case of excessive inclusions, we make it conflict with `glib/gvaluecollector.h`. See: #2370 See: https://discourse.gnome.org/t/straw-man-moving-the-gtype-api-down-to-libglib-2-0/11169
327 lines
11 KiB
C
327 lines
11 KiB
C
/* GObject - GLib Type, Object, Parameter and Signal Library
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* Copyright (C) 2000-2001 Red Hat, Inc.
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* Copyright (C) 2005 Imendio AB
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*
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* SPDX-License-Identifier: LGPL-2.1-or-later
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General
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* Public License along with this library; if not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef __G_CLOSURE_H__
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#define __G_CLOSURE_H__
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#if !defined (__GLIB_GOBJECT_H_INSIDE__) && !defined (GOBJECT_COMPILATION)
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#error "Only <glib-object.h> can be included directly."
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#endif
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#include <glib.h>
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#include <gobject/gobject-visibility.h>
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G_BEGIN_DECLS
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/* --- defines --- */
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/**
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* G_CLOSURE_NEEDS_MARSHAL:
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* @closure: a #GClosure
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*
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* Check if the closure still needs a marshaller. See g_closure_set_marshal().
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*
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* Returns: %TRUE if a #GClosureMarshal marshaller has not yet been set on
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* @closure.
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*/
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#define G_CLOSURE_NEEDS_MARSHAL(closure) (((GClosure*) (closure))->marshal == NULL)
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/**
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* G_CLOSURE_N_NOTIFIERS:
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* @cl: a #GClosure
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*
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* Get the total number of notifiers connected with the closure @cl.
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*
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* The count includes the meta marshaller, the finalize and invalidate notifiers
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* and the marshal guards. Note that each guard counts as two notifiers.
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* See g_closure_set_meta_marshal(), g_closure_add_finalize_notifier(),
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* g_closure_add_invalidate_notifier() and g_closure_add_marshal_guards().
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*
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* Returns: number of notifiers
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*/
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#define G_CLOSURE_N_NOTIFIERS(cl) (((cl)->n_guards << 1L) + \
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(cl)->n_fnotifiers + (cl)->n_inotifiers)
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/**
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* G_CCLOSURE_SWAP_DATA:
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* @cclosure: a #GCClosure
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*
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* Checks whether the user data of the #GCClosure should be passed as the
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* first parameter to the callback. See g_cclosure_new_swap().
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*
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* Returns: %TRUE if data has to be swapped.
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*/
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#define G_CCLOSURE_SWAP_DATA(cclosure) (((GClosure*) (cclosure))->derivative_flag)
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/**
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* G_CALLBACK:
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* @f: a function pointer.
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*
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* Cast a function pointer to a #GCallback.
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*/
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#define G_CALLBACK(f) ((GCallback) (f))
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/**
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* G_TYPE_CLOSURE:
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*
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* The #GType for #GClosure.
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*/
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#define G_TYPE_CLOSURE (g_closure_get_type ())
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/* -- typedefs --- */
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typedef struct _GClosure GClosure;
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typedef struct _GClosureNotifyData GClosureNotifyData;
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/**
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* GCallback:
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*
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* The type used for callback functions in structure definitions and function
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* signatures.
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*
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* This doesn't mean that all callback functions must take no parameters and
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* return void. The required signature of a callback function is determined by
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* the context in which is used (e.g. the signal to which it is connected).
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*
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* Use G_CALLBACK() to cast the callback function to a #GCallback.
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*/
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typedef void (*GCallback) (void);
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/**
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* GClosureNotify:
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* @data: data specified when registering the notification callback
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* @closure: the #GClosure on which the notification is emitted
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*
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* The type used for the various notification callbacks which can be registered
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* on closures.
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*/
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typedef void (*GClosureNotify) (gpointer data,
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GClosure *closure);
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/**
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* GClosureMarshal:
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* @closure: the #GClosure to which the marshaller belongs
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* @return_value: (nullable): a #GValue to store the return
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* value. May be %NULL if the callback of @closure doesn't return a
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* value.
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* @n_param_values: the length of the @param_values array
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* @param_values: (array length=n_param_values): an array of
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* #GValues holding the arguments on which to invoke the
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* callback of @closure
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* @invocation_hint: (nullable): the invocation hint given as the
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* last argument to g_closure_invoke()
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* @marshal_data: (nullable): additional data specified when
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* registering the marshaller, see g_closure_set_marshal() and
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* g_closure_set_meta_marshal()
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*
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* The type used for marshaller functions.
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*/
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typedef void (*GClosureMarshal) (GClosure *closure,
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GValue *return_value,
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guint n_param_values,
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const GValue *param_values,
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gpointer invocation_hint,
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gpointer marshal_data);
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/**
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* GVaClosureMarshal:
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* @closure: the #GClosure to which the marshaller belongs
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* @return_value: (nullable): a #GValue to store the return
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* value. May be %NULL if the callback of @closure doesn't return a
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* value.
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* @instance: (type GObject.TypeInstance): the instance on which the closure is
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* invoked.
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* @args: va_list of arguments to be passed to the closure.
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* @marshal_data: (nullable): additional data specified when
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* registering the marshaller, see g_closure_set_marshal() and
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* g_closure_set_meta_marshal()
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* @n_params: the length of the @param_types array
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* @param_types: (array length=n_params): the #GType of each argument from
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* @args.
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*
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* This is the signature of va_list marshaller functions, an optional
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* marshaller that can be used in some situations to avoid
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* marshalling the signal argument into GValues.
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*/
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typedef void (* GVaClosureMarshal) (GClosure *closure,
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GValue *return_value,
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gpointer instance,
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va_list args,
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gpointer marshal_data,
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int n_params,
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GType *param_types);
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/**
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* GCClosure:
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* @closure: the #GClosure
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* @callback: the callback function
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*
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* A #GCClosure is a specialization of #GClosure for C function callbacks.
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*/
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typedef struct _GCClosure GCClosure;
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/* --- structures --- */
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struct _GClosureNotifyData
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{
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gpointer data;
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GClosureNotify notify;
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};
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struct _GClosure
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{
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/*< private >*/
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guint ref_count : 15; /* (atomic) */
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/* meta_marshal is not used anymore but must be zero for historical reasons
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as it was exposed in the G_CLOSURE_N_NOTIFIERS macro */
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guint meta_marshal_nouse : 1; /* (atomic) */
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guint n_guards : 1; /* (atomic) */
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guint n_fnotifiers : 2; /* finalization notifiers (atomic) */
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guint n_inotifiers : 8; /* invalidation notifiers (atomic) */
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guint in_inotify : 1; /* (atomic) */
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guint floating : 1; /* (atomic) */
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/*< protected >*/
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guint derivative_flag : 1; /* (atomic) */
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/*< public >*/
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guint in_marshal : 1; /* (atomic) */
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guint is_invalid : 1; /* (atomic) */
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/*< private >*/ void (*marshal) (GClosure *closure,
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GValue /*out*/ *return_value,
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guint n_param_values,
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const GValue *param_values,
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gpointer invocation_hint,
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gpointer marshal_data);
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/*< protected >*/ gpointer data;
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/*< private >*/ GClosureNotifyData *notifiers;
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/* invariants/constraints:
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* - ->marshal and ->data are _invalid_ as soon as ->is_invalid==TRUE
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* - invocation of all inotifiers occurs prior to fnotifiers
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* - order of inotifiers is random
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* inotifiers may _not_ free/invalidate parameter values (e.g. ->data)
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* - order of fnotifiers is random
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* - each notifier may only be removed before or during its invocation
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* - reference counting may only happen prior to fnotify invocation
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* (in that sense, fnotifiers are really finalization handlers)
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*/
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};
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/* closure for C function calls, callback() is the user function
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*/
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struct _GCClosure
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{
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GClosure closure;
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gpointer callback;
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};
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/* --- prototypes --- */
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GOBJECT_AVAILABLE_IN_ALL
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GType g_closure_get_type (void) G_GNUC_CONST;
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GOBJECT_AVAILABLE_IN_ALL
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GClosure* g_cclosure_new (GCallback callback_func,
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gpointer user_data,
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GClosureNotify destroy_data);
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GOBJECT_AVAILABLE_IN_ALL
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GClosure* g_cclosure_new_swap (GCallback callback_func,
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gpointer user_data,
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GClosureNotify destroy_data);
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GOBJECT_AVAILABLE_IN_ALL
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GClosure* g_signal_type_cclosure_new (GType itype,
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guint struct_offset);
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/* --- prototypes --- */
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GOBJECT_AVAILABLE_IN_ALL
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GClosure* g_closure_ref (GClosure *closure);
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GOBJECT_AVAILABLE_IN_ALL
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void g_closure_sink (GClosure *closure);
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GOBJECT_AVAILABLE_IN_ALL
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void g_closure_unref (GClosure *closure);
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/* intimidating */
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GOBJECT_AVAILABLE_IN_ALL
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GClosure* g_closure_new_simple (guint sizeof_closure,
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gpointer data);
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GOBJECT_AVAILABLE_IN_ALL
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void g_closure_add_finalize_notifier (GClosure *closure,
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gpointer notify_data,
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GClosureNotify notify_func);
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GOBJECT_AVAILABLE_IN_ALL
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void g_closure_remove_finalize_notifier (GClosure *closure,
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gpointer notify_data,
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GClosureNotify notify_func);
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GOBJECT_AVAILABLE_IN_ALL
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void g_closure_add_invalidate_notifier (GClosure *closure,
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gpointer notify_data,
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GClosureNotify notify_func);
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GOBJECT_AVAILABLE_IN_ALL
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void g_closure_remove_invalidate_notifier (GClosure *closure,
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gpointer notify_data,
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GClosureNotify notify_func);
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GOBJECT_AVAILABLE_IN_ALL
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void g_closure_add_marshal_guards (GClosure *closure,
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gpointer pre_marshal_data,
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GClosureNotify pre_marshal_notify,
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gpointer post_marshal_data,
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GClosureNotify post_marshal_notify);
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GOBJECT_AVAILABLE_IN_ALL
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void g_closure_set_marshal (GClosure *closure,
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GClosureMarshal marshal);
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GOBJECT_AVAILABLE_IN_ALL
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void g_closure_set_meta_marshal (GClosure *closure,
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gpointer marshal_data,
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GClosureMarshal meta_marshal);
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GOBJECT_AVAILABLE_IN_ALL
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void g_closure_invalidate (GClosure *closure);
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GOBJECT_AVAILABLE_IN_ALL
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void g_closure_invoke (GClosure *closure,
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GValue /*out*/ *return_value,
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guint n_param_values,
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const GValue *param_values,
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gpointer invocation_hint);
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/* FIXME:
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OK: data_object::destroy -> closure_invalidate();
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MIS: closure_invalidate() -> disconnect(closure);
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MIS: disconnect(closure) -> (unlink) closure_unref();
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OK: closure_finalize() -> g_free (data_string);
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random remarks:
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- need marshaller repo with decent aliasing to base types
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- provide marshaller collection, virtually covering anything out there
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*/
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GOBJECT_AVAILABLE_IN_ALL
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void g_cclosure_marshal_generic (GClosure *closure,
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GValue *return_gvalue,
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guint n_param_values,
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const GValue *param_values,
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gpointer invocation_hint,
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gpointer marshal_data);
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GOBJECT_AVAILABLE_IN_ALL
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void g_cclosure_marshal_generic_va (GClosure *closure,
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GValue *return_value,
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gpointer instance,
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va_list args_list,
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gpointer marshal_data,
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int n_params,
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GType *param_types);
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G_END_DECLS
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#endif /* __G_CLOSURE_H__ */
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