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@@ -1,5 +1,6 @@
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/* 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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* 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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@@ -18,14 +19,15 @@
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*/
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#include "gclosure.h"
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/*
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* MT safe with regards to reference counting.
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*/
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#include "gvalue.h"
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#include "gobjectalias.h"
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#include <string.h>
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/* FIXME: need caching allocators
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*/
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#define CLOSURE_MAX_REF_COUNT ((1 << 15) - 1)
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#define CLOSURE_MAX_N_GUARDS ((1 << 1) - 1)
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#define CLOSURE_MAX_N_FNOTIFIERS ((1 << 2) - 1)
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@@ -36,6 +38,45 @@
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#define CLOSURE_N_NOTIFIERS(cl) (CLOSURE_N_MFUNCS (cl) + \
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(cl)->n_fnotifiers + \
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(cl)->n_inotifiers)
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typedef union {
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GClosure closure;
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gint vint;
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} ClosureInt;
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#define CHANGE_FIELD(_closure, _field, _OP, _value, _must_set, _SET_OLD, _SET_NEW) \
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G_STMT_START { \
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ClosureInt *cunion = (ClosureInt*) _closure; \
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gint new_int, old_int, success; \
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do \
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{ \
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ClosureInt tmp; \
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tmp.vint = old_int = cunion->vint; \
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_SET_OLD tmp.closure._field; \
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tmp.closure._field _OP _value; \
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_SET_NEW tmp.closure._field; \
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new_int = tmp.vint; \
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success = g_atomic_int_compare_and_exchange (&cunion->vint, old_int, new_int); \
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} \
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while (!success && _must_set); \
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} G_STMT_END
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#define SWAP(_closure, _field, _value, _oldv) CHANGE_FIELD (_closure, _field, =, _value, TRUE, *(_oldv) =, (void) )
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#define SET(_closure, _field, _value) CHANGE_FIELD (_closure, _field, =, _value, TRUE, (void), (void) )
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#define INC(_closure, _field) CHANGE_FIELD (_closure, _field, +=, 1, TRUE, (void), (void) )
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#define INC_ASSIGN(_closure, _field, _newv) CHANGE_FIELD (_closure, _field, +=, 1, TRUE, (void), *(_newv) = )
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#define DEC(_closure, _field) CHANGE_FIELD (_closure, _field, -=, 1, TRUE, (void), (void) )
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#define DEC_ASSIGN(_closure, _field, _newv) CHANGE_FIELD (_closure, _field, -=, 1, TRUE, (void), *(_newv) = )
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#if 0 // for non-thread-safe closures
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#define SWAP(cl,f,v,o) (void) (*(o) = cl->f, cl->f = v)
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#define SET(cl,f,v) (void) (cl->f = v)
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#define INC(cl,f) (void) (cl->f += 1)
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#define INC_ASSIGN(cl,f,n) (void) (cl->f += 1, *(n) = cl->f)
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#define DEC(cl,f) (void) (cl->f -= 1)
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#define DEC_ASSIGN(cl,f,n) (void) (cl->f -= 1, *(n) = cl->f)
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#endif
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enum {
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FNOTIFY,
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INOTIFY,
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@@ -53,17 +94,17 @@ g_closure_new_simple (guint sizeof_closure,
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g_return_val_if_fail (sizeof_closure >= sizeof (GClosure), NULL);
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closure = g_malloc (sizeof_closure);
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closure->ref_count = 1;
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closure->meta_marshal = 0;
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closure->n_guards = 0;
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closure->n_fnotifiers = 0;
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closure->n_inotifiers = 0;
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closure->in_inotify = FALSE;
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closure->floating = TRUE;
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closure->derivative_flag = 0;
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closure->in_marshal = FALSE;
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closure->is_invalid = FALSE;
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closure = g_malloc0 (sizeof_closure);
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SET (closure, ref_count, 1);
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SET (closure, meta_marshal, 0);
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SET (closure, n_guards, 0);
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SET (closure, n_fnotifiers, 0);
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SET (closure, n_inotifiers, 0);
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SET (closure, in_inotify, FALSE);
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SET (closure, floating, TRUE);
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SET (closure, derivative_flag, 0);
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SET (closure, in_marshal, FALSE);
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SET (closure, is_invalid, FALSE);
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closure->marshal = NULL;
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closure->data = data;
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closure->notifiers = NULL;
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@@ -87,8 +128,8 @@ closure_invoke_notifiers (GClosure *closure,
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* - closure->notifiers may be reloacted during callback
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* - closure->n_fnotifiers and closure->n_inotifiers may change during callback
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* - i.e. callbacks can be removed/added during invocation
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* - have to prepare for callback removal during invocation (->marshal & ->data)
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* - have to distinguish (->marshal & ->data) for INOTIFY/FNOTIFY (->in_inotify)
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* - must prepare for callback removal during FNOTIFY and INOTIFY (done via ->marshal= & ->data=)
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* - must distinguish (->marshal= & ->data=) for INOTIFY vs. FNOTIFY (via ->in_inotify)
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* + closure->n_guards is const during PRE_NOTIFY & POST_NOTIFY
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* + closure->meta_marshal is const for all cases
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* + none of the callbacks can cause recursion
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@@ -101,7 +142,8 @@ closure_invoke_notifiers (GClosure *closure,
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case FNOTIFY:
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while (closure->n_fnotifiers)
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{
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register guint n = --closure->n_fnotifiers;
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guint n;
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DEC_ASSIGN (closure, n_fnotifiers, &n);
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ndata = closure->notifiers + CLOSURE_N_MFUNCS (closure) + n;
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closure->marshal = (GClosureMarshal) ndata->notify;
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@@ -112,10 +154,11 @@ closure_invoke_notifiers (GClosure *closure,
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closure->data = NULL;
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break;
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case INOTIFY:
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closure->in_inotify = TRUE;
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SET (closure, in_inotify, TRUE);
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while (closure->n_inotifiers)
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{
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register guint n = --closure->n_inotifiers;
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guint n;
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DEC_ASSIGN (closure, n_inotifiers, &n);
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ndata = closure->notifiers + CLOSURE_N_MFUNCS (closure) + closure->n_fnotifiers + n;
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closure->marshal = (GClosureMarshal) ndata->notify;
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@@ -124,7 +167,7 @@ closure_invoke_notifiers (GClosure *closure,
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}
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closure->marshal = NULL;
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closure->data = NULL;
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closure->in_inotify = FALSE;
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SET (closure, in_inotify, FALSE);
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break;
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case PRE_NOTIFY:
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i = closure->n_guards;
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@@ -174,7 +217,7 @@ g_closure_set_meta_marshal (GClosure *closure,
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}
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closure->notifiers[0].data = marshal_data;
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closure->notifiers[0].notify = (GClosureNotify) meta_marshal;
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closure->meta_marshal = 1;
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SET (closure, meta_marshal, 1);
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}
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void
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@@ -214,11 +257,12 @@ g_closure_add_marshal_guards (GClosure *closure,
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closure->notifiers[(closure->meta_marshal +
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closure->n_guards +
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closure->n_guards + 1)] = closure->notifiers[closure->meta_marshal + closure->n_guards];
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i = closure->n_guards++;
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i = closure->n_guards;
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closure->notifiers[closure->meta_marshal + i].data = pre_marshal_data;
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closure->notifiers[closure->meta_marshal + i].notify = pre_marshal_notify;
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closure->notifiers[closure->meta_marshal + i + 1].data = post_marshal_data;
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closure->notifiers[closure->meta_marshal + i + 1].notify = post_marshal_notify;
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INC (closure, n_guards);
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}
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void
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@@ -238,9 +282,10 @@ g_closure_add_finalize_notifier (GClosure *closure,
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closure->n_fnotifiers +
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closure->n_inotifiers)] = closure->notifiers[(CLOSURE_N_MFUNCS (closure) +
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closure->n_fnotifiers + 0)];
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i = CLOSURE_N_MFUNCS (closure) + closure->n_fnotifiers++;
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i = CLOSURE_N_MFUNCS (closure) + closure->n_fnotifiers;
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closure->notifiers[i].data = notify_data;
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closure->notifiers[i].notify = notify_func;
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INC (closure, n_fnotifiers);
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}
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void
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@@ -256,9 +301,10 @@ g_closure_add_invalidate_notifier (GClosure *closure,
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g_return_if_fail (closure->n_inotifiers < CLOSURE_MAX_N_INOTIFIERS);
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closure->notifiers = g_renew (GClosureNotifyData, closure->notifiers, CLOSURE_N_NOTIFIERS (closure) + 1);
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i = CLOSURE_N_MFUNCS (closure) + closure->n_fnotifiers + closure->n_inotifiers++;
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i = CLOSURE_N_MFUNCS (closure) + closure->n_fnotifiers + closure->n_inotifiers;
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closure->notifiers[i].data = notify_data;
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closure->notifiers[i].notify = notify_func;
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INC (closure, n_inotifiers);
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}
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static inline gboolean
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@@ -272,7 +318,7 @@ closure_try_remove_inotify (GClosure *closure,
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for (ndata = nlast + 1 - closure->n_inotifiers; ndata <= nlast; ndata++)
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if (ndata->notify == notify_func && ndata->data == notify_data)
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{
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closure->n_inotifiers -= 1;
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DEC (closure, n_inotifiers);
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if (ndata < nlast)
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*ndata = *nlast;
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@@ -292,7 +338,7 @@ closure_try_remove_fnotify (GClosure *closure,
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for (ndata = nlast + 1 - closure->n_fnotifiers; ndata <= nlast; ndata++)
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if (ndata->notify == notify_func && ndata->data == notify_data)
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{
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closure->n_fnotifiers -= 1;
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DEC (closure, n_fnotifiers);
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if (ndata < nlast)
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*ndata = *nlast;
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if (closure->n_inotifiers)
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@@ -308,11 +354,13 @@ closure_try_remove_fnotify (GClosure *closure,
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GClosure*
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g_closure_ref (GClosure *closure)
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{
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guint new_ref_count;
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g_return_val_if_fail (closure != NULL, NULL);
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g_return_val_if_fail (closure->ref_count > 0, NULL);
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g_return_val_if_fail (closure->ref_count < CLOSURE_MAX_REF_COUNT, NULL);
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closure->ref_count += 1;
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INC_ASSIGN (closure, ref_count, &new_ref_count);
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g_return_val_if_fail (new_ref_count > 1, NULL);
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return closure;
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}
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@@ -324,9 +372,12 @@ g_closure_invalidate (GClosure *closure)
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if (!closure->is_invalid)
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{
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closure->ref_count += 1; /* preserve floating flag */
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closure->is_invalid = TRUE;
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closure_invoke_notifiers (closure, INOTIFY);
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gboolean was_invalid;
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g_closure_ref (closure); /* preserve floating flag */
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SWAP (closure, is_invalid, TRUE, &was_invalid);
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/* invalidate only once */
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if (!was_invalid)
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closure_invoke_notifiers (closure, INOTIFY);
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g_closure_unref (closure);
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}
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}
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@@ -334,15 +385,17 @@ g_closure_invalidate (GClosure *closure)
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void
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g_closure_unref (GClosure *closure)
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{
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guint new_ref_count;
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g_return_if_fail (closure != NULL);
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g_return_if_fail (closure->ref_count > 0);
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if (closure->ref_count == 1) /* last unref, invalidate first */
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g_closure_invalidate (closure);
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closure->ref_count -= 1;
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DEC_ASSIGN (closure, ref_count, &new_ref_count);
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if (closure->ref_count == 0)
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if (new_ref_count == 0)
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{
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closure_invoke_notifiers (closure, FNOTIFY);
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g_free (closure->notifiers);
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@@ -363,11 +416,11 @@ g_closure_sink (GClosure *closure)
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*/
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if (closure->floating)
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{
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closure->floating = FALSE;
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if (closure->ref_count > 1)
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closure->ref_count -= 1;
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else
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g_closure_unref (closure);
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gboolean was_floating;
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SWAP (closure, floating, FALSE, &was_floating);
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/* unref floating flag only once */
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if (was_floating)
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g_closure_unref (closure);
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}
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}
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@@ -380,7 +433,8 @@ g_closure_remove_invalidate_notifier (GClosure *closure,
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g_return_if_fail (notify_func != NULL);
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if (closure->is_invalid && closure->in_inotify && /* account removal of notify_func() while its called */
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((gpointer) closure->marshal) == ((gpointer) notify_func) && closure->data == notify_data)
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((gpointer) closure->marshal) == ((gpointer) notify_func) &&
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closure->data == notify_data)
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closure->marshal = NULL;
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else if (!closure_try_remove_inotify (closure, notify_data, notify_func))
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g_warning (G_STRLOC ": unable to remove uninstalled invalidation notifier: %p (%p)",
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@@ -396,7 +450,8 @@ g_closure_remove_finalize_notifier (GClosure *closure,
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g_return_if_fail (notify_func != NULL);
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if (closure->is_invalid && !closure->in_inotify && /* account removal of notify_func() while its called */
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((gpointer) closure->marshal) == ((gpointer) notify_func) && closure->data == notify_data)
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((gpointer) closure->marshal) == ((gpointer) notify_func) &&
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closure->data == notify_data)
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closure->marshal = NULL;
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else if (!closure_try_remove_fnotify (closure, notify_data, notify_func))
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g_warning (G_STRLOC ": unable to remove uninstalled finalization notifier: %p (%p)",
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@@ -412,6 +467,7 @@ g_closure_invoke (GClosure *closure,
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{
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g_return_if_fail (closure != NULL);
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g_closure_ref (closure); /* preserve floating flag */
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if (!closure->is_invalid)
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{
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GClosureMarshal marshal;
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@@ -420,8 +476,7 @@ g_closure_invoke (GClosure *closure,
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g_return_if_fail (closure->marshal || closure->meta_marshal);
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closure->ref_count += 1; /* preserve floating flag */
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closure->in_marshal = TRUE;
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SET (closure, in_marshal, TRUE);
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if (closure->meta_marshal)
|
|
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|
|
{
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|
marshal_data = closure->notifiers[0].data;
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|
@@ -441,9 +496,9 @@ g_closure_invoke (GClosure *closure,
|
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marshal_data);
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|
|
if (!in_marshal)
|
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|
|
closure_invoke_notifiers (closure, POST_NOTIFY);
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|
|
closure->in_marshal = in_marshal;
|
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|
|
g_closure_unref (closure);
|
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|
|
SET (closure, in_marshal, in_marshal);
|
|
|
|
|
}
|
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|
|
g_closure_unref (closure);
|
|
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|
|
}
|
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|
|
void
|
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|
|
@@ -490,7 +545,7 @@ g_cclosure_new_swap (GCallback callback_func,
|
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|
|
if (destroy_data)
|
|
|
|
|
g_closure_add_finalize_notifier (closure, user_data, destroy_data);
|
|
|
|
|
((GCClosure*) closure)->callback = (gpointer) callback_func;
|
|
|
|
|
closure->derivative_flag = TRUE;
|
|
|
|
|
SET (closure, derivative_flag, TRUE);
|
|
|
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|
|
|
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|
|
return closure;
|
|
|
|
|
}
|
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