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gsignal.c
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gsignal.c
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/* GObject - GLib Type, Object, Parameter and Signal Library
* Copyright (C) 2000-2001 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>
*/
/*
* MT safe
*/
#include <config.h>
#include "gsignal.h"
#include "gbsearcharray.h"
#include "gvaluecollector.h"
#include "gvaluetypes.h"
#include "gboxed.h"
#include "gobject.h"
#include "genums.h"
#include "gobjectalias.h"
#include <string.h>
#include <signal.h>
/* pre allocation configurations
*/
#define MAX_STACK_VALUES (16)
#define REPORT_BUG "please report occurrence circumstances to gtk-devel-list@gnome.org"
#ifdef G_ENABLE_DEBUG
#define IF_DEBUG(debug_type, cond) if ((_g_type_debug_flags & G_TYPE_DEBUG_ ## debug_type) || cond)
static volatile gpointer g_trace_instance_signals = NULL;
static volatile gpointer g_trap_instance_signals = NULL;
#endif /* G_ENABLE_DEBUG */
/* --- 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,
gulong 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 gint handler_lists_cmp (gconstpointer node1,
gconstpointer node2);
static inline void emission_push (Emission **emission_list_p,
Emission *emission);
static inline void emission_pop (Emission **emission_list_p,
Emission *emission);
static inline Emission* emission_find (Emission *emission_list,
guint signal_id,
GQuark detail,
gpointer instance);
static gint class_closures_cmp (gconstpointer node1,
gconstpointer node2);
static gint signal_key_cmp (gconstpointer node1,
gconstpointer node2);
static gboolean signal_emit_unlocked_R (SignalNode *node,
GQuark detail,
gpointer instance,
GValue *return_value,
const GValue *instance_and_params);
static const gchar * type_debug_name (GType type);
/* --- structures --- */
typedef struct
{
GSignalAccumulator func;
gpointer data;
} SignalAccumulator;
typedef struct
{
GHook hook;
GQuark detail;
} SignalHook;
#define SIGNAL_HOOK(hook) ((SignalHook*) (hook))
struct _SignalNode
{
/* permanent portion */
guint signal_id;
GType itype;
const gchar *name;
guint destroyed : 1;
/* reinitializable portion */
guint test_class_offset : 12;
guint flags : 8;
guint n_params : 8;
GType *param_types; /* mangled with G_SIGNAL_TYPE_STATIC_SCOPE flag */
GType return_type; /* mangled with G_SIGNAL_TYPE_STATIC_SCOPE flag */
GBSearchArray *class_closure_bsa;
SignalAccumulator *accumulator;
GSignalCMarshaller c_marshaller;
GHookList *emission_hooks;
};
#define MAX_TEST_CLASS_OFFSET (4096) /* 2^12, 12 bits for test_class_offset */
#define TEST_CLASS_MAGIC (1) /* indicates NULL class closure, candidate for NOP optimization */
struct _SignalKey
{
GType itype;
GQuark quark;
guint signal_id;
};
struct _Emission
{
Emission *next;
gpointer instance;
GSignalInvocationHint ihint;
EmissionState state;
GType chain_type;
};
struct _HandlerList
{
guint signal_id;
Handler *handlers;
Handler *tail_before; /* normal signal handlers are appended here */
Handler *tail_after; /* CONNECT_AFTER handlers are appended here */
};
struct _Handler
{
gulong sequential_number;
Handler *next;
Handler *prev;
GQuark detail;
guint ref_count;
guint block_count : 16;
#define HANDLER_MAX_BLOCK_COUNT (1 << 16)
guint after : 1;
GClosure *closure;
};
struct _HandlerMatch
{
Handler *handler;
HandlerMatch *next;
guint signal_id;
};
typedef struct
{
GType instance_type; /* 0 for default closure */
GClosure *closure;
} ClassClosure;
/* --- variables --- */
static GBSearchArray *g_signal_key_bsa = NULL;
static const GBSearchConfig g_signal_key_bconfig = {
sizeof (SignalKey),
signal_key_cmp,
G_BSEARCH_ARRAY_ALIGN_POWER2,
};
static GBSearchConfig g_signal_hlbsa_bconfig = {
sizeof (HandlerList),
handler_lists_cmp,
0,
};
static GBSearchConfig g_class_closure_bconfig = {
sizeof (ClassClosure),
class_closures_cmp,
0,
};
static GHashTable *g_handler_list_bsa_ht = NULL;
static Emission *g_recursive_emissions = NULL;
static Emission *g_restart_emissions = NULL;
static gulong g_handler_sequential_number = 1;
G_LOCK_DEFINE_STATIC (g_signal_mutex);
#define SIGNAL_LOCK() G_LOCK (g_signal_mutex)
#define SIGNAL_UNLOCK() G_UNLOCK (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)
{
GType *ifaces, type = itype;
SignalKey key;
guint n_ifaces;
key.quark = quark;
/* try looking up signals for this type and its ancestors */
do
{
SignalKey *signal_key;
key.itype = type;
signal_key = g_bsearch_array_lookup (g_signal_key_bsa, &g_signal_key_bconfig, &key);
if (signal_key)
return signal_key->signal_id;
type = g_type_parent (type);
}
while (type);
/* no luck, try interfaces it exports */
ifaces = g_type_interfaces (itype, &n_ifaces);
while (n_ifaces--)
{
SignalKey *signal_key;
key.itype = ifaces[n_ifaces];
signal_key = g_bsearch_array_lookup (g_signal_key_bsa, &g_signal_key_bconfig, &key);
if (signal_key)
{
g_free (ifaces);
return signal_key->signal_id;
}
}
g_free (ifaces);
return 0;
}
static gint
class_closures_cmp (gconstpointer node1,
gconstpointer node2)
{
const ClassClosure *c1 = node1, *c2 = node2;
return G_BSEARCH_ARRAY_CMP (c1->instance_type, c2->instance_type);
}
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;
key.signal_id = signal_id;
key.handlers = NULL;
key.tail_before = NULL;
key.tail_after = NULL;
if (!hlbsa)
{
hlbsa = g_bsearch_array_create (&g_signal_hlbsa_bconfig);
hlbsa = g_bsearch_array_insert (hlbsa, &g_signal_hlbsa_bconfig, &key);
g_hash_table_insert (g_handler_list_bsa_ht, instance, hlbsa);
}
else
{
GBSearchArray *o = hlbsa;
hlbsa = g_bsearch_array_insert (o, &g_signal_hlbsa_bconfig, &key);
if (hlbsa != o)
g_hash_table_insert (g_handler_list_bsa_ht, instance, hlbsa);
}
return g_bsearch_array_lookup (hlbsa, &g_signal_hlbsa_bconfig, &key);
}
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, &g_signal_hlbsa_bconfig, &key) : NULL;
}
static Handler*
handler_lookup (gpointer instance,
gulong 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, &g_signal_hlbsa_bconfig, i);
Handler *handler;
for (handler = hlist->handlers; handler; handler = handler->next)
if (handler->sequential_number == 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;
node = g_slice_new (HandlerMatch);
node->handler = handler;
node->next = list;
node->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->signal_id, instance, node->handler);
g_slice_free (HandlerMatch, 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 = NULL;
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->sequential_number &&
((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, &g_signal_hlbsa_bconfig, i);
SignalNode *node = NULL;
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->sequential_number &&
((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, hlist->signal_id);
if (one_and_only)
return mlist;
}
}
}
}
return mlist;
}
static inline Handler*
handler_new (gboolean after)
{
Handler *handler = g_slice_new (Handler);
#ifndef G_DISABLE_CHECKS
if (g_handler_sequential_number < 1)
g_error (G_STRLOC ": handler id overflow, %s", REPORT_BUG);
#endif
handler->sequential_number = g_handler_sequential_number++;
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);
g_atomic_int_inc (&handler->ref_count);
}
static inline void
handler_unref_R (guint signal_id,
gpointer instance,
Handler *handler)
{
gboolean is_zero;
g_return_if_fail (handler->ref_count > 0);
is_zero = g_atomic_int_dec_and_test (&handler->ref_count);
if (G_UNLIKELY (is_zero))
{
HandlerList *hlist = NULL;
if (handler->next)
handler->next->prev = handler->prev;
if (handler->prev) /* watch out for g_signal_handlers_destroy()! */
handler->prev->next = handler->next;
else
{
hlist = handler_list_lookup (signal_id, instance);
hlist->handlers = handler->next;
}
if (instance)
{
/* check if we are removing the handler pointed to by tail_before */
if (!handler->after && (!handler->next || handler->next->after))
{
if (!hlist)
hlist = handler_list_lookup (signal_id, instance);
if (hlist)
{
g_assert (hlist->tail_before == handler); /* paranoid */
hlist->tail_before = handler->prev;
}
}
/* check if we are removing the handler pointed to by tail_after */
if (!handler->next)
{
if (!hlist)
hlist = handler_list_lookup (signal_id, instance);
if (hlist)
{
g_assert (hlist->tail_after == handler); /* paranoid */
hlist->tail_after = handler->prev;
}
}
}
SIGNAL_UNLOCK ();
g_closure_unref (handler->closure);
SIGNAL_LOCK ();
g_slice_free (Handler, handler);
}
}
static void
handler_insert (guint signal_id,
gpointer instance,
Handler *handler)
{
HandlerList *hlist;
g_assert (handler->prev == NULL && handler->next == NULL); /* paranoid */
hlist = handler_list_ensure (signal_id, instance);
if (!hlist->handlers)
{
hlist->handlers = handler;
if (!handler->after)
hlist->tail_before = handler;
}
else if (handler->after)
{
handler->prev = hlist->tail_after;
hlist->tail_after->next = handler;
}
else
{
if (hlist->tail_before)
{
handler->next = hlist->tail_before->next;
if (handler->next)
handler->next->prev = handler;
handler->prev = hlist->tail_before;
hlist->tail_before->next = handler;
}
else /* insert !after handler into a list of only after handlers */
{
handler->next = hlist->handlers;
if (handler->next)
handler->next->prev = handler;
hlist->handlers = handler;
}
hlist->tail_before = handler;
}
if (!handler->next)
hlist->tail_after = handler;
}
static inline void
emission_push (Emission **emission_list_p,
Emission *emission)
{
emission->next = *emission_list_p;
*emission_list_p = emission;
}
static inline void
emission_pop (Emission **emission_list_p,
Emission *emission)
{
Emission *node, *last = NULL;
for (node = *emission_list_p; node; last = node, node = last->next)
if (node == emission)
{
if (last)
last->next = node->next;
else
*emission_list_p = node->next;
return;
}
g_assert_not_reached ();
}
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->ihint.signal_id == signal_id &&
emission->ihint.detail == detail)
return emission;
return NULL;
}
static inline Emission*
emission_find_innermost (gpointer instance)
{
Emission *emission, *s = NULL, *c = NULL;
for (emission = g_restart_emissions; emission; emission = emission->next)
if (emission->instance == instance)
{
s = emission;
break;
}
for (emission = g_recursive_emissions; emission; emission = emission->next)
if (emission->instance == instance)
{
c = emission;
break;
}
if (!s)
return c;
else if (!c)
return s;
else
return G_HAVE_GROWING_STACK ? MAX (c, s) : MIN (c, s);
}
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)
{
SIGNAL_LOCK ();
if (!g_n_signal_nodes)
{
/* 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);
g_signal_key_bsa = g_bsearch_array_create (&g_signal_key_bconfig);
/* 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;
}
SIGNAL_UNLOCK ();
}
void
_g_signals_destroy (GType itype)
{
guint i;
SIGNAL_LOCK ();
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,
type_debug_name (node->itype));
else
signal_destroy_R (node);
}
}
SIGNAL_UNLOCK ();
}
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);
SIGNAL_LOCK ();
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);
SIGNAL_UNLOCK ();
return;
}
if (node && g_type_is_a (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 == 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 == EMISSION_RUN)
emission->state = 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);
SIGNAL_UNLOCK ();
}
static void
signal_finalize_hook (GHookList *hook_list,
GHook *hook)
{
GDestroyNotify destroy = hook->destroy;
if (destroy)
{
hook->destroy = NULL;
SIGNAL_UNLOCK ();
destroy (hook->data);
SIGNAL_LOCK ();
}
}
gulong
g_signal_add_emission_hook (guint signal_id,
GQuark detail,
GSignalEmissionHook hook_func,
gpointer hook_data,
GDestroyNotify data_destroy)
{
static gulong seq_hook_id = 1;
SignalNode *node;
GHook *hook;
SignalHook *signal_hook;
g_return_val_if_fail (signal_id > 0, 0);
g_return_val_if_fail (hook_func != NULL, 0);
SIGNAL_LOCK ();
node = LOOKUP_SIGNAL_NODE (signal_id);
if (!node || node->destroyed)
{
g_warning ("%s: invalid signal id `%u'", G_STRLOC, signal_id);
SIGNAL_UNLOCK ();
return 0;
}
if (node->flags & G_SIGNAL_NO_HOOKS)
{
g_warning ("%s: signal id `%u' does not support emission hooks (G_SIGNAL_NO_HOOKS flag set)", G_STRLOC, signal_id);
SIGNAL_UNLOCK ();
return 0;
}
if (detail && !(node->flags & G_SIGNAL_DETAILED))
{
g_warning ("%s: signal id `%u' does not support detail (%u)", G_STRLOC, signal_id, detail);
SIGNAL_UNLOCK ();
return 0;
}
if (!node->emission_hooks)
{
node->emission_hooks = g_new (GHookList, 1);
g_hook_list_init (node->emission_hooks, sizeof (SignalHook));
node->emission_hooks->finalize_hook = signal_finalize_hook;
}
hook = g_hook_alloc (node->emission_hooks);
hook->data = hook_data;
hook->func = (gpointer) hook_func;
hook->destroy = data_destroy;
signal_hook = SIGNAL_HOOK (hook);
signal_hook->detail = detail;
node->emission_hooks->seq_id = seq_hook_id;
g_hook_append (node->emission_hooks, hook);
seq_hook_id = node->emission_hooks->seq_id;
SIGNAL_UNLOCK ();
return hook->hook_id;
}
void
g_signal_remove_emission_hook (guint signal_id,
gulong hook_id)
{
SignalNode *node;
g_return_if_fail (signal_id > 0);
g_return_if_fail (hook_id > 0);
SIGNAL_LOCK ();
node = LOOKUP_SIGNAL_NODE (signal_id);
if (!node || node->destroyed)
g_warning ("%s: invalid signal id `%u'", G_STRLOC, signal_id);
else if (!node->emission_hooks || !g_hook_destroy (node->emission_hooks, hook_id))
g_warning ("%s: signal \"%s\" had no hook (%lu) to remove", G_STRLOC, node->name, hook_id);
SIGNAL_UNLOCK ();
}
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)
{
SignalNode *node;
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);
SIGNAL_LOCK ();
signal_id = signal_parse_name (detailed_signal, itype, &detail, force_detail_quark);
SIGNAL_UNLOCK ();
node = signal_id ? LOOKUP_SIGNAL_NODE (signal_id) : NULL;
if (!node || node->destroyed ||
(detail && !(node->flags & G_SIGNAL_DETAILED)))
return FALSE;
if (signal_id_p)
*signal_id_p = signal_id;
if (detail_p)
*detail_p = detail;
return TRUE;
}
void
g_signal_stop_emission_by_name (gpointer instance,
const gchar *detailed_signal)
{
guint signal_id;
GQuark detail = 0;
GType itype;
g_return_if_fail (G_TYPE_CHECK_INSTANCE (instance));
g_return_if_fail (detailed_signal != NULL);
SIGNAL_LOCK ();
itype = G_TYPE_FROM_INSTANCE (instance);
signal_id = signal_parse_name (detailed_signal, itype, &detail, TRUE);
if (signal_id)
{
SignalNode *node = LOOKUP_SIGNAL_NODE (signal_id);
if (detail && !(node->flags & G_SIGNAL_DETAILED))
g_warning ("%s: signal `%s' does not support details", G_STRLOC, detailed_signal);
else if (!g_type_is_a (itype, node->itype))
g_warning ("%s: signal `%s' is invalid for instance `%p'", G_STRLOC, detailed_signal, instance);
else
{
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 == 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 == EMISSION_RUN)
emission->state = 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 `%s' is invalid for instance `%p'", G_STRLOC, detailed_signal, instance);
SIGNAL_UNLOCK ();
}
guint
g_signal_lookup (const gchar *name,
GType itype)
{