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gclosure: Combine flags reads with refs in some methods

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Rather than atomically querying the flags, and then atomically reffing
the `GClosure`, do the atomic ref and return the new flags value as a
side-effect. This eliminates the need for an additional atomic read, and
eliminates a race window between the two accesses.

It does mean we need a new internal version of `g_closure_ref()` which
returns the new `GClosureFlags` though.

Signed-off-by: Philip Withnall <pwithnall@gnome.org>
This commit is contained in:
Philip Withnall
2025-04-04 01:30:00 +01:00
parent c9ef461aa1
commit cd45d1ddcd
1 changed files with 33 additions and 12 deletions
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45
gobject/gclosure.c
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@@ -580,6 +580,30 @@ closure_try_remove_fnotify (GClosure *closure,
return FALSE;
}
static GClosureFlags
closure_ref_internal (GClosure *closure)
{
guint new_ref_count;
int old_int, success;
GClosureFlags tmp = { .atomic_int = 0, };
old_int = g_atomic_int_get (&((GClosureFlags *) closure)->atomic_int);
do
{
tmp.atomic_int = old_int;
tmp.flags.ref_count += 1;
success = g_atomic_int_compare_and_exchange_full (&((GClosureFlags *) closure)->atomic_int, old_int, tmp.atomic_int, &old_int);
}
while (!success);
new_ref_count = tmp.flags.ref_count;
g_return_val_if_fail (new_ref_count > 1, tmp);
g_return_val_if_fail (new_ref_count < CLOSURE_MAX_REF_COUNT + 1, tmp);
return tmp;
}
/**
* g_closure_ref:
* @closure: #GClosure to increment the reference count on
@@ -592,14 +616,9 @@ closure_try_remove_fnotify (GClosure *closure,
GClosure*
g_closure_ref (GClosure *closure)
{
guint new_ref_count;
g_return_val_if_fail (closure != NULL, NULL);
ATOMIC_INC_ASSIGN (closure, ref_count, &new_ref_count);
g_return_val_if_fail (new_ref_count > 1, NULL);
g_return_val_if_fail (new_ref_count < CLOSURE_MAX_REF_COUNT + 1, NULL);
closure_ref_internal (closure);
return closure;
}
@@ -865,18 +884,19 @@ g_closure_invoke (GClosure *closure,
const GValue *param_values,
gpointer invocation_hint)
{
GClosureFlags reffed_flags;
GRealClosure *real_closure;
g_return_if_fail (closure != NULL);
real_closure = G_REAL_CLOSURE (closure);
g_closure_ref (closure); /* preserve floating flag */
if (!closure->is_invalid)
reffed_flags = closure_ref_internal (closure); /* preserve floating flag */
if (!reffed_flags.flags.is_invalid)
{
GClosureMarshal marshal;
gpointer marshal_data;
gboolean in_marshal = closure->in_marshal;
gboolean in_marshal = reffed_flags.flags.in_marshal;
g_return_if_fail (closure->marshal || real_closure->meta_marshal);
@@ -928,18 +948,19 @@ _g_closure_invoke_va (GClosure *closure,
int n_params,
GType *param_types)
{
GClosureFlags reffed_flags;
GRealClosure *real_closure;
g_return_if_fail (closure != NULL);
real_closure = G_REAL_CLOSURE (closure);
g_closure_ref (closure); /* preserve floating flag */
if (!closure->is_invalid)
reffed_flags = closure_ref_internal (closure); /* preserve floating flag */
if (!reffed_flags.flags.is_invalid)
{
GVaClosureMarshal marshal;
gpointer marshal_data;
gboolean in_marshal = closure->in_marshal;
gboolean in_marshal = reffed_flags.flags.in_marshal;
g_return_if_fail (closure->marshal || real_closure->meta_marshal);