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83c45024e3
glib/gobject/gsignal.c
Tim Janik 83c45024e3 fixed a bag full of subtle bugs of immensive screw-up potential in 
Sun Nov  5 05:22:55 2000  Tim Janik  <timj@gtk.org>

        * gsignal.c:
        fixed a bag full of subtle bugs of immensive screw-up potential in
        handlers_find(), luckily no one found out about them yet ;)
        fixed signal_handlers_foreach_matched_R() so it operates on an
        initial handler list snapshot provided by handlers_find() to work
        around general reentrancy problems and to avoid multiple callback()
        invocations on the same handlers.
        this code is now officially 80% bug free (10% remaining for interface
        types, and 10% remaining for destroyed signals ;)

Sat Nov  4 02:01:33 2000  Tim Janik  <timj@gtk.org>

        * gsignal.c (_g_signals_destroy): valid signal nodes start out at 1.

        * gtypeplugin.[hc]: new files holding a GTypePlugin interface
        implementation that provides the API required by GType to deal with
        dynamically loadable types.

        * gtype.[hc]: displace any GTypePlugin business to gtypeplugin.h.
2000-11-05 05:07:26 +00:00

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/* GObject - GLib Type, Object, Parameter and Signal Library
* Copyright (C) 2000 Red Hat, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General
* Public License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place, Suite 330,
* Boston, MA 02111-1307, USA.
*
* this code is based on the original GtkSignal implementation
* for the Gtk+ library by Peter Mattis <petm@xcf.berkeley.edu>
*/
#include <string.h>
#include "gsignal.h"
#include "gbsearcharray.h"
/* pre allocation configurations
*/
#define BSA_PRE_ALLOC (20)
#define HANDLER_PRE_ALLOC (48)
#define EMISSION_PRE_ALLOC (16)
#define TIGHT_MEMORY (1)
#define REPORT_BUG "please report occourance circumstances to gtk-devel-list@gnome.org"
/* --- generic allocation --- */
/* we can special case allocations generically by replacing
* these functions with more speed/memory aware variants
*/
static inline gpointer
g_generic_node_alloc (GTrashStack **trash_stack_p,
guint sizeof_node,
guint nodes_pre_alloc)
{
gpointer node = g_trash_stack_pop (trash_stack_p);
if (!node)
{
guint8 *block;
nodes_pre_alloc = MAX (nodes_pre_alloc, 1);
block = g_malloc (sizeof_node * nodes_pre_alloc);
while (--nodes_pre_alloc)
{
g_trash_stack_push (trash_stack_p, block);
block += sizeof_node;
}
node = block;
}
return node;
}
static inline void
g_generic_node_free (GTrashStack **trash_stack_p,
gpointer node)
{
g_trash_stack_push (trash_stack_p, node);
}
/* --- typedefs --- */
typedef struct _SignalNode SignalNode;
typedef struct _SignalKey SignalKey;
typedef struct _Emission Emission;
typedef struct _Handler Handler;
typedef struct _HandlerList HandlerList;
typedef struct _HandlerMatch HandlerMatch;
typedef enum
{
EMISSION_STOP,
EMISSION_RUN,
EMISSION_HOOK,
EMISSION_RESTART
} EmissionState;
/* --- prototypes --- */
static inline guint signal_id_lookup (GQuark quark,
GType itype);
static void signal_destroy_R (SignalNode *signal_node);
static inline HandlerList* handler_list_ensure (guint signal_id,
gpointer instance);
static inline HandlerList* handler_list_lookup (guint signal_id,
gpointer instance);
static inline Handler* handler_new (gboolean after);
static void handler_insert (guint signal_id,
gpointer instance,
Handler *handler);
static Handler* handler_lookup (gpointer instance,
guint handler_id,
guint *signal_id_p);
static inline HandlerMatch* handler_match_prepend (HandlerMatch *list,
Handler *handler,
guint signal_id);
static inline HandlerMatch* handler_match_free1_R (HandlerMatch *node,
gpointer instance);
static HandlerMatch* handlers_find (gpointer instance,
GSignalMatchType mask,
guint signal_id,
GQuark detail,
GClosure *closure,
gpointer func,
gpointer data,
gboolean one_and_only);
static inline void handler_ref (Handler *handler);
static inline void handler_unref_R (guint signal_id,
gpointer instance,
Handler *handler);
static inline void emission_push (Emission **emission_list_p,
guint signal_id,
GQuark detail,
gpointer instance,
EmissionState *state_p);
static inline void emission_pop (Emission **emission_list_p,
EmissionState *state_p);
static inline Emission* emission_find (Emission *emission_list,
guint signal_id,
GQuark detail,
gpointer instance);
static void signal_emit_R (SignalNode *node,
GQuark detail,
gpointer instance,
GValue *return_value,
const GValue *instance_and_params);
/* --- structures --- */
struct _SignalNode
{
/* permanent portion */
guint signal_id;
GType itype;
gchar *name;
guint destroyed : 1;
/* reinitializable portion */
guint flags : 8;
guint n_params : 8;
GType *param_types;
GType return_type;
GClosure *class_closure;
GSignalAccumulator accumulator;
GSignalCMarshaller c_marshaller;
GHookList *emission_hooks;
};
struct _SignalKey
{
GType itype;
GQuark quark;
guint signal_id;
};
struct _Emission
{
Emission *next;
guint signal_id;
GQuark detail;
gpointer instance;
EmissionState *state_p;
};
struct _HandlerList
{
guint signal_id;
Handler *handlers;
};
struct _Handler
{
guint id;
Handler *next;
Handler *prev;
GQuark detail;
guint ref_count : 16;
#define HANDLER_MAX_REF_COUNT (1 << 16)
guint block_count : 12;
#define HANDLER_MAX_BLOCK_COUNT (1 << 12)
guint after : 1;
GClosure *closure;
};
struct _HandlerMatch
{
Handler *handler;
HandlerMatch *next;
union {
guint signal_id;
gpointer dummy;
} d;
};
/* --- variables --- */
static GBSearchArray g_signal_key_bsa = { NULL, 0, 0, 0, NULL };
static GHashTable *g_handler_list_bsa_ht = NULL;
static Emission *g_recursive_emissions = NULL;
static Emission *g_restart_emissions = NULL;
static GTrashStack *g_bsa_ts = NULL;
static GTrashStack *g_handler_ts = NULL;
static GTrashStack *g_emission_ts = NULL;
G_LOCK_DEFINE_STATIC (g_signal_mutex);
/* --- signal nodes --- */
static guint g_n_signal_nodes = 0;
static SignalNode **g_signal_nodes = NULL;
static inline SignalNode*
LOOKUP_SIGNAL_NODE (register guint signal_id)
{
if (signal_id < g_n_signal_nodes)
return g_signal_nodes[signal_id];
else
return NULL;
}
/* --- functions --- */
static inline guint
signal_id_lookup (GQuark quark,
GType itype)
{
do
{
SignalKey key, *signal_key;
key.itype = itype;
key.quark = quark;
signal_key = g_bsearch_array_lookup (&g_signal_key_bsa, &key);
if (signal_key)
return signal_key->signal_id;
itype = g_type_parent (itype);
}
while (itype);
return 0;
}
static gint
handler_lists_cmp (gconstpointer node1,
gconstpointer node2)
{
const HandlerList *hlist1 = node1, *hlist2 = node2;
return G_BSEARCH_ARRAY_CMP (hlist1->signal_id, hlist2->signal_id);
}
static inline HandlerList*
handler_list_ensure (guint signal_id,
gpointer instance)
{
GBSearchArray *hlbsa = g_hash_table_lookup (g_handler_list_bsa_ht, instance);
HandlerList key;
if (!hlbsa)
{
hlbsa = g_generic_node_alloc (&g_bsa_ts,
sizeof (GBSearchArray),
BSA_PRE_ALLOC);
hlbsa->cmp_func = handler_lists_cmp;
hlbsa->sizeof_node = sizeof (HandlerList);
hlbsa->flags = G_BSEARCH_DEFER_SHRINK;
hlbsa->n_nodes = 0;
hlbsa->nodes = NULL;
g_hash_table_insert (g_handler_list_bsa_ht, instance, hlbsa);
}
key.signal_id = signal_id;
key.handlers = NULL;
return g_bsearch_array_insert (hlbsa, &key, FALSE);
}
static inline HandlerList*
handler_list_lookup (guint signal_id,
gpointer instance)
{
GBSearchArray *hlbsa = g_hash_table_lookup (g_handler_list_bsa_ht, instance);
HandlerList key;
key.signal_id = signal_id;
return hlbsa ? g_bsearch_array_lookup (hlbsa, &key) : NULL;
}
static Handler*
handler_lookup (gpointer instance,
guint handler_id,
guint *signal_id_p)
{
GBSearchArray *hlbsa = g_hash_table_lookup (g_handler_list_bsa_ht, instance);
if (hlbsa)
{
guint i;
for (i = 0; i < hlbsa->n_nodes; i++)
{
HandlerList *hlist = g_bsearch_array_get_nth (hlbsa, i);
Handler *handler;
for (handler = hlist->handlers; handler; handler = handler->next)
if (handler->id == handler_id)
{
if (signal_id_p)
*signal_id_p = hlist->signal_id;
return handler;
}
}
}
return NULL;
}
static inline HandlerMatch*
handler_match_prepend (HandlerMatch *list,
Handler *handler,
guint signal_id)
{
HandlerMatch *node;
/* yeah, we could use our own memchunk here, introducing yet more
* rarely used cached nodes and extra allocation overhead.
* instead, we use GList* nodes, since they are exactly the size
* we need and are already cached. g_signal_init() asserts this.
*/
node = (HandlerMatch*) g_list_alloc ();
node->handler = handler;
node->next = list;
node->d.signal_id = signal_id;
handler_ref (handler);
return node;
}
static inline HandlerMatch*
handler_match_free1_R (HandlerMatch *node,
gpointer instance)
{
HandlerMatch *next = node->next;
handler_unref_R (node->d.signal_id, instance, node->handler);
g_list_free_1 ((GList*) node);
return next;
}
static HandlerMatch*
handlers_find (gpointer instance,
GSignalMatchType mask,
guint signal_id,
GQuark detail,
GClosure *closure,
gpointer func,
gpointer data,
gboolean one_and_only)
{
HandlerMatch *mlist = NULL;
if (mask & G_SIGNAL_MATCH_ID)
{
HandlerList *hlist = handler_list_lookup (signal_id, instance);
Handler *handler;
SignalNode *node;
if (mask & G_SIGNAL_MATCH_FUNC)
{
node = LOOKUP_SIGNAL_NODE (signal_id);
if (!node || !node->c_marshaller)
return NULL;
}
mask = ~mask;
for (handler = hlist ? hlist->handlers : NULL; handler; handler = handler->next)
if (handler->id &&
((mask & G_SIGNAL_MATCH_DETAIL) || handler->detail == detail) &&
((mask & G_SIGNAL_MATCH_CLOSURE) || handler->closure == closure) &&
((mask & G_SIGNAL_MATCH_DATA) || handler->closure->data == data) &&
((mask & G_SIGNAL_MATCH_UNBLOCKED) || handler->block_count == 0) &&
((mask & G_SIGNAL_MATCH_FUNC) || (handler->closure->marshal == node->c_marshaller &&
handler->closure->meta_marshal == 0 &&
((GCClosure*) handler->closure)->callback == func)))
{
mlist = handler_match_prepend (mlist, handler, signal_id);
if (one_and_only)
return mlist;
}
}
else
{
GBSearchArray *hlbsa = g_hash_table_lookup (g_handler_list_bsa_ht, instance);
mask = ~mask;
if (hlbsa)
{
guint i;
for (i = 0; i < hlbsa->n_nodes; i++)
{
HandlerList *hlist = g_bsearch_array_get_nth (hlbsa, i);
SignalNode *node;
Handler *handler;
if (!(mask & G_SIGNAL_MATCH_FUNC))
{
node = LOOKUP_SIGNAL_NODE (hlist->signal_id);
if (!node->c_marshaller)
continue;
}
for (handler = hlist->handlers; handler; handler = handler->next)
if (handler->id &&
((mask & G_SIGNAL_MATCH_DETAIL) || handler->detail == detail) &&
((mask & G_SIGNAL_MATCH_CLOSURE) || handler->closure == closure) &&
((mask & G_SIGNAL_MATCH_DATA) || handler->closure->data == data) &&
((mask & G_SIGNAL_MATCH_UNBLOCKED) || handler->block_count == 0) &&
((mask & G_SIGNAL_MATCH_FUNC) || (handler->closure->marshal == node->c_marshaller &&
handler->closure->meta_marshal == 0 &&
((GCClosure*) handler->closure)->callback == func)))
{
mlist = handler_match_prepend (mlist, handler, signal_id);
if (one_and_only)
return mlist;
}
}
}
}
return mlist;
}
static inline Handler*
handler_new (gboolean after)
{
static guint handler_id = 1;
Handler *handler = g_generic_node_alloc (&g_handler_ts,
sizeof (Handler),
HANDLER_PRE_ALLOC);
#ifndef G_DISABLE_CHECKS
if (handler_id == 0)
g_error (G_STRLOC ": handler id overflow, %s", REPORT_BUG);
#endif
handler->id = handler_id++;
handler->prev = NULL;
handler->next = NULL;
handler->detail = 0;
handler->ref_count = 1;
handler->block_count = 0;
handler->after = after != FALSE;
handler->closure = NULL;
return handler;
}
static inline void
handler_ref (Handler *handler)
{
g_return_if_fail (handler->ref_count > 0);
#ifndef G_DISABLE_CHECKS
if (handler->ref_count >= HANDLER_MAX_REF_COUNT - 1)
g_error (G_STRLOC ": handler ref_count overflow, %s", REPORT_BUG);
#endif
handler->ref_count += 1;
}
static inline void
handler_unref_R (guint signal_id,
gpointer instance,
Handler *handler)
{
g_return_if_fail (handler->ref_count > 0);
handler->ref_count -= 1;
if (!handler->ref_count)
{
if (handler->next)
handler->next->prev = handler->prev;
if (handler->prev) /* watch out for g_signal_handlers_destroy()! */
handler->prev->next = handler->next;
else
{
HandlerList *hlist = handler_list_lookup (signal_id, instance);
hlist->handlers = handler->next;
}
G_UNLOCK (g_signal_mutex);
g_closure_unref (handler->closure);
G_LOCK (g_signal_mutex);
g_generic_node_free (&g_handler_ts, handler);
}
}
static void
handler_insert (guint signal_id,
gpointer instance,
Handler *handler)
{
HandlerList *hlist;
g_assert (handler->prev == NULL && handler->next == NULL); // FIXME: paranoid
hlist = handler_list_ensure (signal_id, instance);
if (!hlist->handlers)
hlist->handlers = handler;
else if (hlist->handlers->after && !handler->after)
{
handler->next = hlist->handlers;
hlist->handlers->prev = handler;
hlist->handlers = handler;
}
else
{
Handler *tmp = hlist->handlers;
if (handler->after)
while (tmp->next)
tmp = tmp->next;
else
while (tmp->next && !tmp->next->after)
tmp = tmp->next;
if (tmp->next)
tmp->next->prev = handler;
handler->next = tmp->next;
handler->prev = tmp;
tmp->next = handler;
}
}
static inline void
emission_push (Emission **emission_list_p,
guint signal_id,
GQuark detail,
gpointer instance,
EmissionState *state_p)
{
Emission *emission = g_generic_node_alloc (&g_emission_ts,
sizeof (Emission),
EMISSION_PRE_ALLOC);
emission->next = *emission_list_p;
emission->signal_id = signal_id;
emission->detail = detail;
emission->instance = instance;
emission->state_p = state_p;
*emission_list_p = emission;
}
static inline void
emission_pop (Emission **emission_list_p,
EmissionState *state_p)
{
Emission **loc = emission_list_p, *emission = *loc;
while (emission->state_p != state_p)
{
loc = &emission->next;
emission = *loc;
}
*loc = emission->next;
g_generic_node_free (&g_emission_ts, emission);
}
static inline Emission*
emission_find (Emission *emission_list,
guint signal_id,
GQuark detail,
gpointer instance)
{
Emission *emission;
for (emission = emission_list; emission; emission = emission->next)
if (emission->instance == instance &&
emission->signal_id == signal_id &&
emission->detail == detail)
return emission;
return NULL;
}
static gint
signal_key_cmp (gconstpointer node1,
gconstpointer node2)
{
const SignalKey *key1 = node1, *key2 = node2;
if (key1->itype == key2->itype)
return G_BSEARCH_ARRAY_CMP (key1->quark, key2->quark);
else
return G_BSEARCH_ARRAY_CMP (key1->itype, key2->itype);
}
void
g_signal_init (void) /* sync with gtype.c */
{
G_LOCK (g_signal_mutex);
if (!g_n_signal_nodes)
{
/* handler_id_node_prepend() requires this */
g_assert (sizeof (GList) == sizeof (HandlerMatch));
/* setup signal key array */
g_signal_key_bsa.cmp_func = signal_key_cmp;
g_signal_key_bsa.sizeof_node = sizeof (SignalKey);
g_signal_key_bsa.flags = 0; /* alloc-only */
/* setup handler list binary searchable array hash table (in german, that'd be one word ;) */
g_handler_list_bsa_ht = g_hash_table_new (g_direct_hash, NULL);
/* invalid (0) signal_id */
g_n_signal_nodes = 1;
g_signal_nodes = g_renew (SignalNode*, g_signal_nodes, g_n_signal_nodes);
g_signal_nodes[0] = NULL;
}
G_UNLOCK (g_signal_mutex);
}
void
_g_signals_destroy (GType itype)
{
guint i;
G_LOCK (g_signal_mutex);
for (i = 1; i < g_n_signal_nodes; i++)
{
SignalNode *node = g_signal_nodes[i];
if (node->itype == itype)
{
if (node->destroyed)
g_warning (G_STRLOC ": signal \"%s\" of type `%s' already destroyed",
node->name,
g_type_name (node->itype));
else
signal_destroy_R (node);
}
}
G_UNLOCK (g_signal_mutex);
}
void
g_signal_stop_emission (gpointer instance,
guint signal_id,
GQuark detail)
{
SignalNode *node;
g_return_if_fail (G_TYPE_CHECK_INSTANCE (instance));
g_return_if_fail (signal_id > 0);
G_LOCK (g_signal_mutex);
node = LOOKUP_SIGNAL_NODE (signal_id);
if (node && detail && !(node->flags & G_SIGNAL_DETAILED))
{
g_warning ("%s: signal id `%u' does not support detail (%u)", G_STRLOC, signal_id, detail);
G_UNLOCK (g_signal_mutex);
return;
}
if (node && g_type_conforms_to (G_TYPE_FROM_INSTANCE (instance), node->itype))
{
Emission *emission_list = node->flags & G_SIGNAL_NO_RECURSE ? g_restart_emissions : g_recursive_emissions;
Emission *emission = emission_find (emission_list, signal_id, detail, instance);
if (emission)
{
if (*emission->state_p == EMISSION_HOOK)
g_warning (G_STRLOC ": emission of signal \"%s\" for instance `%p' cannot be stopped from emission hook",
node->name, instance);
else if (*emission->state_p == EMISSION_RUN)
*emission->state_p = EMISSION_STOP;
}
else
g_warning (G_STRLOC ": no emission of signal \"%s\" to stop for instance `%p'",
node->name, instance);
}
else
g_warning ("%s: signal id `%u' is invalid for instance `%p'", G_STRLOC, signal_id, instance);
G_UNLOCK (g_signal_mutex);
}
static inline guint
signal_parse_name (const gchar *name,
GType itype,
GQuark *detail_p,
gboolean force_quark)
{
const gchar *colon = strchr (name, ':');
guint signal_id;
if (!colon)
{
signal_id = signal_id_lookup (g_quark_try_string (name), itype);
if (signal_id && detail_p)
*detail_p = 0;
}
else if (colon[1] == ':')
{
gchar buffer[32];
guint l = colon - name;
if (l < 32)
{
memcpy (buffer, name, l);
buffer[l] = 0;
signal_id = signal_id_lookup (g_quark_try_string (buffer), itype);
}
else
{
gchar *signal = g_new (gchar, l + 1);
memcpy (signal, name, l);
signal[l] = 0;
signal_id = signal_id_lookup (g_quark_try_string (signal), itype);
g_free (signal);
}
if (signal_id && detail_p)
*detail_p = colon[2] ? (force_quark ? g_quark_from_string : g_quark_try_string) (colon + 2) : 0;
}
else
signal_id = 0;
return signal_id;
}
gboolean
g_signal_parse_name (const gchar *detailed_signal,
GType itype,
guint *signal_id_p,
GQuark *detail_p,
gboolean force_detail_quark)
{
GQuark detail = 0;
guint signal_id;
g_return_val_if_fail (detailed_signal != NULL, FALSE);
g_return_val_if_fail (G_TYPE_IS_INSTANTIATABLE (itype) || G_TYPE_IS_INTERFACE (itype), FALSE);
G_LOCK (g_signal_mutex);
signal_id = signal_parse_name (detailed_signal, itype, &detail, force_detail_quark);
G_UNLOCK (g_signal_mutex);
if (signal_id)
{
if (signal_id_p)
*signal_id_p = signal_id;
if (detail_p)
*detail_p = detail;
return TRUE;
}
else
return FALSE;
}
guint
g_signal_lookup (const gchar *name,
GType itype)
{
guint signal_id;
g_return_val_if_fail (name != NULL, 0);
g_return_val_if_fail (G_TYPE_IS_INSTANTIATABLE (itype) || G_TYPE_IS_INTERFACE (itype), 0);
G_LOCK (g_signal_mutex);
signal_id = signal_id_lookup (g_quark_try_string (name), itype);
G_UNLOCK (g_signal_mutex);
return signal_id;
}
gchar*
g_signal_name (guint signal_id)
{
SignalNode *node;
gchar *name;
G_LOCK (g_signal_mutex);
node = LOOKUP_SIGNAL_NODE (signal_id);
name = node ? node->name : NULL;
G_UNLOCK (g_signal_mutex);
return name;
}
void
g_signal_query (guint signal_id,
GSignalQuery *query)
{
SignalNode *node;
g_return_if_fail (query != NULL);
G_LOCK (g_signal_mutex);
node = LOOKUP_SIGNAL_NODE (signal_id);
if (!node || node->destroyed)
query->signal_id = 0;
else
{
query->signal_id = node->signal_id;
query->signal_name = node->name;
query->itype = node->itype;
query->signal_flags = node->flags;
query->return_type = node->return_type;
query->n_params = node->n_params;
query->param_types = node->param_types;
}
G_UNLOCK (g_signal_mutex);
}
guint*
g_signal_list_ids (GType itype,
guint *n_ids)
{
SignalKey *keys;
GArray *result;
guint n_nodes;
guint i;
g_return_val_if_fail (G_TYPE_IS_INSTANTIATABLE (itype) || G_TYPE_IS_INTERFACE (itype), NULL);
g_return_val_if_fail (n_ids != NULL, NULL);
G_LOCK (g_signal_mutex);
keys = g_signal_key_bsa.nodes;
n_nodes = g_signal_key_bsa.n_nodes;
result = g_array_new (FALSE, FALSE, sizeof (guint));
for (i = 0; i < n_nodes; i++)
if (keys[i].itype == itype)
{
gchar *name = g_quark_to_string (keys[i].quark);
/* Signal names with "_" in them are aliases to the same
* name with "-" instead of "_".
*/
if (!strchr (name, '_'))
g_array_append_val (result, keys[i].signal_id);
}
*n_ids = result->len;
G_UNLOCK (g_signal_mutex);
return (guint *) g_array_free (result, FALSE);
}
guint
g_signal_newv (const gchar *signal_name,
GType itype,
GSignalFlags signal_flags,
GClosure *class_closure,
GSignalAccumulator accumulator,
GSignalCMarshaller c_marshaller,
GType return_type,
guint n_params,
GType *param_types)
{
gchar *name;
guint signal_id, i;
SignalNode *node;
g_return_val_if_fail (signal_name != NULL, 0);
g_return_val_if_fail (G_TYPE_IS_INSTANTIATABLE (itype) || G_TYPE_IS_INTERFACE (itype), 0);
if (n_params)
g_return_val_if_fail (param_types != NULL, 0);
if (return_type != G_TYPE_NONE)
g_return_val_if_fail (accumulator == NULL, 0);
name = g_strdup (signal_name);
g_strdelimit (name, G_STR_DELIMITERS ":^", '_'); // FIXME do character checks like for types
G_LOCK (g_signal_mutex);
signal_id = signal_id_lookup (g_quark_try_string (name), itype);
node = LOOKUP_SIGNAL_NODE (signal_id);
if (node && !node->destroyed)
{
g_warning (G_STRLOC ": signal \"%s\" already exists in the `%s' %s",
name,
g_type_name (node->itype),
G_TYPE_IS_INTERFACE (node->itype) ? "interface" : "class ancestry");
g_free (name);
G_UNLOCK (g_signal_mutex);
return 0;
}
if (node && node->itype != itype)
{
g_warning (G_STRLOC ": signal \"%s\" for type `%s' was previously created for type `%s'",
name,
g_type_name (itype),
g_type_name (node->itype));
g_free (name);
G_UNLOCK (g_signal_mutex);
return 0;
}
for (i = 0; i < n_params; i++)
if (!G_TYPE_IS_VALUE (param_types[i]) ||
param_types[i] == G_TYPE_ENUM || param_types[i] == G_TYPE_FLAGS) /* FIXME: kludge */
{
g_warning (G_STRLOC ": parameter %d of type `%s' for signal \"%s::%s\" is not a value type",
i + 1, g_type_name (param_types[i]), g_type_name (itype), name);
g_free (name);
G_UNLOCK (g_signal_mutex);
return 0;
}
if (return_type != G_TYPE_NONE && !G_TYPE_IS_VALUE (return_type))
{
g_warning (G_STRLOC ": return value of type `%s' for signal \"%s::%s\" is not a value type",
g_type_name (param_types[i]), g_type_name (itype), name);
g_free (name);
G_UNLOCK (g_signal_mutex);
return 0;
}
/* setup permanent portion of signal node */
if (!node)
{
SignalKey key;
signal_id = g_n_signal_nodes++;
node = g_new (SignalNode, 1);
node->signal_id = signal_id;
g_signal_nodes = g_renew (SignalNode*, g_signal_nodes, g_n_signal_nodes);
g_signal_nodes[signal_id] = node;
node->itype = itype;
node->name = name;
key.itype = itype;
key.quark = g_quark_from_string (node->name);
key.signal_id = signal_id;
g_bsearch_array_insert (&g_signal_key_bsa, &key, FALSE);
g_strdelimit (node->name, "_", '-');
key.quark = g_quark_from_static_string (node->name);
g_bsearch_array_insert (&g_signal_key_bsa, &key, FALSE);
}
node->destroyed = FALSE;
/* setup reinitializable portion */
node->flags = signal_flags & G_SIGNAL_FLAGS_MASK;
node->n_params = n_params;
node->param_types = g_memdup (param_types, sizeof (GType) * n_params);
node->return_type = return_type;
node->class_closure = class_closure ? g_closure_ref (class_closure) : NULL;
node->accumulator = accumulator;
node->c_marshaller = c_marshaller;
node->emission_hooks = NULL;
if (node->c_marshaller && class_closure && G_CLOSURE_NEEDS_MARSHAL (class_closure))
g_closure_set_marshal (class_closure, node->c_marshaller);
G_UNLOCK (g_signal_mutex);
return signal_id;
}
static void
signal_destroy_R (SignalNode *signal_node)
{
SignalNode node = *signal_node;
signal_node->destroyed = TRUE;
/* reentrancy caution, zero out real contents first */
signal_node->n_params = 0;
signal_node->param_types = NULL;
signal_node->return_type = 0;
signal_node->class_closure = NULL;
signal_node->accumulator = NULL;
signal_node->c_marshaller = NULL;
signal_node->emission_hooks = NULL;
#ifndef G_DISABLE_CHECKS
/* check current emissions */
{
Emission *emission;
for (emission = (node.flags & G_SIGNAL_NO_RECURSE) ? g_restart_emissions : g_recursive_emissions;
emission; emission = emission->next)
if (emission->signal_id == node.signal_id)
g_critical (G_STRLOC ": signal \"%s\" being destroyed is currently in emission (instance `%p')",
node.name, emission->instance);
}
#endif
/* free contents that need to
*/
G_UNLOCK (g_signal_mutex);
g_free (node.param_types);
g_closure_unref (node.class_closure);
if (node.emission_hooks)
{
g_hook_list_clear (node.emission_hooks);
g_free (node.emission_hooks);
}
G_LOCK (g_signal_mutex);
}
guint
g_signal_connect_closure_by_id (gpointer instance,
guint signal_id,
GQuark detail,
GClosure *closure,
gboolean after)
{
SignalNode *node;
guint handler_id = 0;
g_return_val_if_fail (G_TYPE_CHECK_INSTANCE (instance), 0);
g_return_val_if_fail (signal_id > 0, 0);
g_return_val_if_fail (closure != NULL, 0);
G_LOCK (g_signal_mutex);
node = LOOKUP_SIGNAL_NODE (signal_id);
if (node && detail && !(node->flags & G_SIGNAL_DETAILED))
{
g_warning ("%s: signal id `%u' does not support detail (%u)", G_STRLOC, signal_id, detail);
G_UNLOCK (g_signal_mutex);
return 0;
}
if (node && g_type_conforms_to (G_TYPE_FROM_INSTANCE (instance), node->itype))
{
Handler *handler = handler_new (after);
handler_id = handler->id;
handler->detail = detail;
handler->closure = g_closure_ref (closure);
handler_insert (signal_id, instance, handler);
if (node->c_marshaller && G_CLOSURE_NEEDS_MARSHAL (closure))
g_closure_set_marshal (closure, node->c_marshaller);
}
else
g_warning ("%s: signal id `%u' is invalid for instance `%p'", G_STRLOC, signal_id, instance);
G_UNLOCK (g_signal_mutex);
return handler_id;
}
void
g_signal_handler_block (gpointer instance,
guint handler_id)
{
Handler *handler;
g_return_if_fail (G_TYPE_CHECK_INSTANCE (instance));
g_return_if_fail (handler_id > 0);
G_LOCK (g_signal_mutex);
handler = handler_lookup (instance, handler_id, NULL);
if (handler)
{
#ifndef G_DISABLE_CHECKS
if (handler->block_count >= HANDLER_MAX_BLOCK_COUNT - 1)
g_error (G_STRLOC ": handler block_count overflow, %s", REPORT_BUG);
#endif
handler->block_count += 1;
}
else
g_warning ("%s: instance `%p' has no handler with id `%u'", G_STRLOC, instance, handler_id);
G_UNLOCK (g_signal_mutex);
}
void
g_signal_handler_unblock (gpointer instance,
guint handler_id)
{
Handler *handler;
g_return_if_fail (G_TYPE_CHECK_INSTANCE (instance));
g_return_if_fail (handler_id > 0);
G_LOCK (g_signal_mutex);
handler = handler_lookup (instance, handler_id, NULL);
if (handler)
{
if (handler->block_count)
handler->block_count -= 1;
else
g_warning (G_STRLOC ": handler `%u' of instance `%p' is not blocked", handler_id, instance);
}
else
g_warning ("%s: instance `%p' has no handler with id `%u'", G_STRLOC, instance, handler_id);
G_UNLOCK (g_signal_mutex);
}
void
g_signal_handler_disconnect (gpointer instance,
guint handler_id)
{
Handler *handler;
guint signal_id;
g_return_if_fail (G_TYPE_CHECK_INSTANCE (instance));
g_return_if_fail (handler_id > 0);
G_LOCK (g_signal_mutex);
handler = handler_lookup (instance, handler_id, &signal_id);
if (handler)
{
handler->id = 0;
handler->block_count = 1;
handler_unref_R (signal_id, instance, handler);
}
else
g_warning ("%s: instance `%p' has no handler with id `%u'", G_STRLOC, instance, handler_id);
G_UNLOCK (g_signal_mutex);
}
void
g_signal_handlers_destroy (gpointer instance)
{
GBSearchArray *hlbsa;
g_return_if_fail (G_TYPE_CHECK_INSTANCE (instance));
G_LOCK (g_signal_mutex);
hlbsa = g_hash_table_lookup (g_handler_list_bsa_ht, instance);
if (hlbsa)
{
guint i;
/* reentrancy caution, delete instance trace first */
g_hash_table_remove (g_handler_list_bsa_ht, instance);
for (i = 0; i < hlbsa->n_nodes; i++)
{
HandlerList *hlist = g_bsearch_array_get_nth (hlbsa, i);
Handler *handler = hlist->handlers;
while (handler)
{
Handler *tmp = handler;
handler = tmp->next;
tmp->block_count = 1;
/* cruel unlink, this works because _all_ handlers vanish */
tmp->next = NULL;
tmp->prev = tmp;
if (tmp->id)
{
tmp->id = 0;
handler_unref_R (0, NULL, tmp);
}
}
}
g_free (hlbsa->nodes);
g_generic_node_free (&g_bsa_ts, hlbsa);
}
G_UNLOCK (g_signal_mutex);
}
guint
g_signal_handler_find (gpointer instance,
GSignalMatchType mask,
guint signal_id,
GQuark detail,
GClosure *closure,
gpointer func,
gpointer data)
{
guint handler_id = 0;
g_return_val_if_fail (G_TYPE_CHECK_INSTANCE (instance), 0);
g_return_val_if_fail ((mask & ~G_SIGNAL_MATCH_MASK) == 0, 0);
if (mask & G_SIGNAL_MATCH_MASK)
{
HandlerMatch *mlist;
G_LOCK (g_signal_mutex);
mlist = handlers_find (instance, mask, signal_id, detail, closure, func, data, TRUE);
if (mlist)
{
handler_id = mlist->handler->id;
handler_match_free1_R (mlist, instance);
}
G_UNLOCK (g_signal_mutex);
}
return handler_id;
}
static guint
signal_handlers_foreach_matched_R (gpointer instance,
GSignalMatchType mask,
guint signal_id,
GQuark detail,
GClosure *closure,
gpointer func,
gpointer data,
void (*callback) (gpointer instance,
guint handler_id))
{
HandlerMatch *mlist;
guint n_handlers = 0;
mlist = handlers_find (instance, mask, signal_id, detail, closure, func, data, FALSE);
while (mlist)
{
n_handlers++;
G_UNLOCK (g_signal_mutex);
callback (instance, mlist->handler->id);
G_LOCK (g_signal_mutex);
mlist = handler_match_free1_R (mlist, instance);
}
return n_handlers;
}
guint
g_signal_handlers_block_matched (gpointer instance,
GSignalMatchType mask,
guint signal_id,
GQuark detail,
GClosure *closure,
gpointer func,
gpointer data)
{
guint n_handlers = 0;
g_return_val_if_fail (G_TYPE_CHECK_INSTANCE (instance), FALSE);
g_return_val_if_fail ((mask & ~G_SIGNAL_MATCH_MASK) == 0, FALSE);
if (mask & (G_SIGNAL_MATCH_CLOSURE | G_SIGNAL_MATCH_FUNC | G_SIGNAL_MATCH_DATA))
{
G_LOCK (g_signal_mutex);
n_handlers = signal_handlers_foreach_matched_R (instance, mask, signal_id, detail,
closure, func, data,
g_signal_handler_block);
G_UNLOCK (g_signal_mutex);
}
return n_handlers;
}
guint
g_signal_handlers_unblock_matched (gpointer instance,
GSignalMatchType mask,
guint signal_id,
GQuark detail,
GClosure *closure,
gpointer func,
gpointer data)
{
guint n_handlers = 0;
g_return_val_if_fail (G_TYPE_CHECK_INSTANCE (instance), FALSE);
g_return_val_if_fail ((mask & ~G_SIGNAL_MATCH_MASK) == 0, FALSE);
if (mask & (G_SIGNAL_MATCH_CLOSURE | G_SIGNAL_MATCH_FUNC | G_SIGNAL_MATCH_DATA))
{
G_LOCK (g_signal_mutex);
n_handlers = signal_handlers_foreach_matched_R (instance, mask, signal_id, detail,
closure, func, data,
g_signal_handler_unblock);
G_UNLOCK (g_signal_mutex);
}
return n_handlers;
}
guint
g_signal_handlers_disconnect_matched (gpointer instance,
GSignalMatchType mask,
guint signal_id,
GQuark detail,
GClosure *closure,
gpointer func,
gpointer data)
{
guint n_handlers = 0;
g_return_val_if_fail (G_TYPE_CHECK_INSTANCE (instance), FALSE);
g_return_val_if_fail ((mask & ~G_SIGNAL_MATCH_MASK) == 0, FALSE);
if (mask & (G_SIGNAL_MATCH_CLOSURE | G_SIGNAL_MATCH_FUNC | G_SIGNAL_MATCH_DATA))
{
G_LOCK (g_signal_mutex);
n_handlers = signal_handlers_foreach_matched_R (instance, mask, signal_id, detail,
closure, func, data,
g_signal_handler_disconnect);
G_UNLOCK (g_signal_mutex);
}
return n_handlers;
}
gboolean
g_signal_has_handler_pending (gpointer instance,
guint signal_id,
GQuark detail,
gboolean may_be_blocked)
{
HandlerMatch *mlist;
gboolean has_pending;
g_return_val_if_fail (G_TYPE_CHECK_INSTANCE (instance), FALSE);
g_return_val_if_fail (signal_id > 0, FALSE);
G_LOCK (g_signal_mutex);
if (detail)
{
SignalNode *node = LOOKUP_SIGNAL_NODE (signal_id);
if (!(node->flags & G_SIGNAL_DETAILED))
{
g_warning ("%s: signal id `%u' does not support detail (%u)", G_STRLOC, signal_id, detail);
G_UNLOCK (g_signal_mutex);
return FALSE;
}
}
mlist = handlers_find (instance,
(G_SIGNAL_MATCH_ID | G_SIGNAL_MATCH_DETAIL | (may_be_blocked ? 0 : G_SIGNAL_MATCH_UNBLOCKED)),
signal_id, detail, NULL, NULL, NULL, TRUE);
if (mlist)
{
has_pending = TRUE;
handler_match_free1_R (mlist, instance);
}
else
has_pending = FALSE;
G_UNLOCK (g_signal_mutex);
return has_pending;
}
void
g_signal_emitv (const GValue *instance_and_params,
guint signal_id,
GQuark detail,
GValue *return_value)
{
SignalNode *node;
gpointer instance;
const GValue *param_values;
guint i;
g_return_if_fail (instance_and_params != NULL);
instance = g_value_get_as_pointer (instance_and_params);
g_return_if_fail (G_TYPE_CHECK_INSTANCE (instance));
g_return_if_fail (signal_id > 0);
param_values = instance_and_params + 1;
G_LOCK (g_signal_mutex);
node = LOOKUP_SIGNAL_NODE (signal_id);
#ifndef G_DISABLE_CHECKS
if (!node || !g_type_conforms_to (G_TYPE_FROM_INSTANCE (instance), node->itype))
{
g_warning ("%s: signal id `%u' is invalid for instance `%p'", G_STRLOC, signal_id, instance);
G_UNLOCK (g_signal_mutex);
return;
}
if (detail && !(node->flags & G_SIGNAL_DETAILED))
{
g_warning ("%s: signal id `%u' does not support detail (%u)", G_STRLOC, signal_id, detail);
G_UNLOCK (g_signal_mutex);
return;
}
for (i = 0; i < node->n_params; i++)
if (!G_VALUE_HOLDS (param_values + i, node->param_types[i]))
{
g_critical (G_STRLOC ": value for `%s' parameter %u for signal \"%s\" is of type `%s'",
g_type_name (node->param_types[i]),
i,
node->name,
G_VALUE_TYPE_NAME (param_values + i));
G_UNLOCK (g_signal_mutex);
return;
}
if (node->return_type != G_TYPE_NONE)
{
if (!return_value)
{
g_critical (G_STRLOC ": return value `%s' for signal \"%s\" is (NULL)",
g_type_name (node->return_type),
node->name);
G_UNLOCK (g_signal_mutex);
return;
}
else if (!node->accumulator && !G_VALUE_HOLDS (return_value, node->return_type))
{
g_critical (G_STRLOC ": return value `%s' for signal \"%s\" is of type `%s'",
g_type_name (node->return_type),
node->name,
G_VALUE_TYPE_NAME (return_value));
G_UNLOCK (g_signal_mutex);
return;
}
}
else
return_value = NULL;
#endif /* !G_DISABLE_CHECKS */
signal_emit_R (node, detail, instance, return_value, instance_and_params);
G_UNLOCK (g_signal_mutex);
}
static void
signal_emit_R (SignalNode *node,
GQuark detail,
gpointer instance,
GValue *return_value,
const GValue *instance_and_params)
{
EmissionState emission_state = 0;
GSignalAccumulator accumulator;
GSignalInvocationHint ihint;
GClosure *class_closure;
HandlerList *hlist;
Handler *handler_list = NULL;
GValue accu;
gboolean accu_used = FALSE;
guint signal_id = node->signal_id;
if (node->flags & G_SIGNAL_NO_RECURSE)
{
Emission *emission = emission_find (g_restart_emissions, signal_id, detail, instance);
if (emission)
{
*emission->state_p = EMISSION_RESTART;
return;
}
}
ihint.signal_id = node->signal_id;
ihint.detail = detail;
accumulator = node->accumulator;
if (accumulator)
{
G_UNLOCK (g_signal_mutex);
g_value_init (&accu, node->return_type);
G_LOCK (g_signal_mutex);
}
emission_push ((node->flags & G_SIGNAL_NO_RECURSE) ? &g_restart_emissions : &g_recursive_emissions,
signal_id, detail, instance, &emission_state);
class_closure = node->class_closure;
EMIT_RESTART:
if (handler_list)
handler_unref_R (signal_id, instance, handler_list);
hlist = handler_list_lookup (signal_id, instance);
handler_list = hlist ? hlist->handlers : NULL;
if (handler_list)
handler_ref (handler_list);
ihint.run_type = G_SIGNAL_RUN_FIRST;
if ((node->flags & G_SIGNAL_RUN_FIRST) && class_closure)
{
emission_state = EMISSION_RUN;
G_UNLOCK (g_signal_mutex);
if (accumulator)
{
if (accu_used)
g_value_reset (&accu);
g_closure_invoke (class_closure,
&accu,
node->n_params + 1,
instance_and_params,
&ihint);
if (!accumulator (&ihint, return_value, &accu) &&
emission_state == EMISSION_RUN)
emission_state = EMISSION_STOP;
accu_used = TRUE;
}
else
g_closure_invoke (class_closure,
return_value,
node->n_params + 1,
instance_and_params,
&ihint);
G_LOCK (g_signal_mutex);
if (emission_state == EMISSION_STOP)
goto EMIT_CLEANUP;
else if (emission_state == EMISSION_RESTART)
goto EMIT_RESTART;
}
if (node->emission_hooks)
{
emission_state = EMISSION_HOOK;
G_UNLOCK (g_signal_mutex);
g_print ("emission_hooks()\n");
G_LOCK (g_signal_mutex);
if (emission_state == EMISSION_RESTART)
goto EMIT_RESTART;
}
if (handler_list)
{
Handler *handler = handler_list;
emission_state = EMISSION_RUN;
handler_ref (handler);
do
{
Handler *tmp;
if (handler->after)
{
handler_unref_R (signal_id, instance, handler_list);
handler_list = handler;
break;
}
else if (!handler->block_count && (!handler->detail || handler->detail == detail))
{
G_UNLOCK (g_signal_mutex);
if (accumulator)
{
if (accu_used)
g_value_reset (&accu);
g_closure_invoke (handler->closure,
&accu,
node->n_params + 1,
instance_and_params,
&ihint);
if (!accumulator (&ihint, return_value, &accu) &&
emission_state == EMISSION_RUN)
emission_state = EMISSION_STOP;
accu_used = TRUE;
}
else
g_closure_invoke (handler->closure,
return_value,
node->n_params + 1,
instance_and_params,
&ihint);
G_LOCK (g_signal_mutex);
tmp = emission_state == EMISSION_RUN ? handler->next : NULL;
}
else
tmp = handler->next;
if (tmp)
handler_ref (tmp);
handler_unref_R (signal_id, instance, handler_list);
handler_list = handler;
handler = tmp;
}
while (handler);
if (emission_state == EMISSION_STOP)
goto EMIT_CLEANUP;
else if (emission_state == EMISSION_RESTART)
goto EMIT_RESTART;
}
ihint.run_type = G_SIGNAL_RUN_LAST;
if ((node->flags & G_SIGNAL_RUN_LAST) && class_closure)
{
emission_state = EMISSION_RUN;
G_UNLOCK (g_signal_mutex);
if (accumulator)
{
if (accu_used)
g_value_reset (&accu);
g_closure_invoke (class_closure,
&accu,
node->n_params + 1,
instance_and_params,
&ihint);
if (!accumulator (&ihint, return_value, &accu) &&
emission_state == EMISSION_RUN)
emission_state = EMISSION_STOP;
accu_used = TRUE;
}
else
g_closure_invoke (class_closure,
return_value,
node->n_params + 1,
instance_and_params,
&ihint);
G_LOCK (g_signal_mutex);
if (emission_state == EMISSION_STOP)
goto EMIT_CLEANUP;
else if (emission_state == EMISSION_RESTART)
goto EMIT_RESTART;
}
if (handler_list)
{
Handler *handler = handler_list;
emission_state = EMISSION_RUN;
handler_ref (handler);
do
{
Handler *tmp;
if (handler->after && !handler->block_count && (!handler->detail || handler->detail == detail))
{
G_UNLOCK (g_signal_mutex);
if (accumulator)
{
if (accu_used)
g_value_reset (&accu);
g_closure_invoke (handler->closure,
&accu,
node->n_params + 1,
instance_and_params,
&ihint);
if (!accumulator (&ihint, return_value, &accu) &&
emission_state == EMISSION_RUN)
emission_state = EMISSION_STOP;
accu_used = TRUE;
}
else
g_closure_invoke (handler->closure,
return_value,
node->n_params + 1,
instance_and_params,
&ihint);
G_LOCK (g_signal_mutex);
tmp = emission_state == EMISSION_RUN ? handler->next : NULL;
}
else
tmp = handler->next;
if (tmp)
handler_ref (tmp);
handler_unref_R (signal_id, instance, handler);
handler = tmp;
}
while (handler);
if (emission_state == EMISSION_STOP)
goto EMIT_CLEANUP;
else if (emission_state == EMISSION_RESTART)
goto EMIT_RESTART;
}
EMIT_CLEANUP:
ihint.run_type = G_SIGNAL_RUN_CLEANUP;
if ((node->flags & G_SIGNAL_RUN_CLEANUP) && class_closure)
{
gboolean need_unset = FALSE;
emission_state = EMISSION_STOP;
G_UNLOCK (g_signal_mutex);
if (node->return_type != G_TYPE_NONE)
{
if (!accumulator)
{
g_value_init (&accu, node->return_type);
need_unset = TRUE;
}
else if (accu_used)
g_value_reset (&accu);
}
g_closure_invoke (class_closure,
node->return_type != G_TYPE_NONE ? &accu : NULL,
node->n_params + 1,
instance_and_params,
&ihint);
if (need_unset)
g_value_unset (&accu);
G_LOCK (g_signal_mutex);
if (emission_state == EMISSION_RESTART)
goto EMIT_RESTART;
}
if (handler_list)
handler_unref_R (signal_id, instance, handler_list);
emission_pop ((node->flags & G_SIGNAL_NO_RECURSE) ? &g_restart_emissions : &g_recursive_emissions, &emission_state);
if (accumulator)
{
G_UNLOCK (g_signal_mutex);
g_value_unset (&accu);
G_LOCK (g_signal_mutex);
}
}
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