mirror of
https://gitlab.gnome.org/GNOME/glib.git
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Merge branch 'atomic-gcancellable' into 'main'
GCancellable: Use per-instance mutex logic instead of global critical sections Closes #2309 and #2313 See merge request GNOME/glib!2765
This commit is contained in:
Marco Trevisan
commit
8ceae00c44
@ -1,6 +1,7 @@
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/* GIO - GLib Input, Output and Streaming Library
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*
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* Copyright (C) 2006-2007 Red Hat, Inc.
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* Copyright (C) 2022-2024 Canonical, Ltd.
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*
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* SPDX-License-Identifier: LGPL-2.1-or-later
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*
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@ -18,6 +19,7 @@
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* Public License along with this library; if not, see <http://www.gnu.org/licenses/>.
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*
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* Author: Alexander Larsson <alexl@redhat.com>
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* Author: Marco Trevisan <marco.trevisan@canonical.com>
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*/
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#include "config.h"
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@ -45,14 +47,12 @@ enum {
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struct _GCancellablePrivate
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{
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/* Atomic so that g_cancellable_is_cancelled does not require holding the mutex. */
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/* Atomic so that we don't require holding global mutexes for independent ops. */
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gboolean cancelled;
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/* Access to fields below is protected by cancellable_mutex. */
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guint cancelled_running : 1;
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guint cancelled_running_waiting : 1;
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unsigned cancelled_emissions;
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unsigned cancelled_emissions_waiting : 1;
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int cancelled_running;
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/* Access to fields below is protected by cancellable's mutex. */
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GMutex mutex;
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guint fd_refcount;
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GWakeup *wakeup;
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};
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@ -62,7 +62,6 @@ static guint signals[LAST_SIGNAL] = { 0 };
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G_DEFINE_TYPE_WITH_PRIVATE (GCancellable, g_cancellable, G_TYPE_OBJECT)
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static GPrivate current_cancellable;
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static GMutex cancellable_mutex;
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static GCond cancellable_cond;
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static void
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@ -70,9 +69,15 @@ g_cancellable_finalize (GObject *object)
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{
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GCancellable *cancellable = G_CANCELLABLE (object);
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/* We're at finalization phase, so only one thread can be here.
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* Thus there's no need to lock. In case something is locking us, then we've
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* a bug, and g_mutex_clear() will make this clear aborting.
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*/
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if (cancellable->priv->wakeup)
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GLIB_PRIVATE_CALL (g_wakeup_free) (cancellable->priv->wakeup);
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g_mutex_clear (&cancellable->priv->mutex);
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G_OBJECT_CLASS (g_cancellable_parent_class)->finalize (object);
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}
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@ -154,6 +159,8 @@ static void
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g_cancellable_init (GCancellable *cancellable)
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{
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cancellable->priv = g_cancellable_get_instance_private (cancellable);
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g_mutex_init (&cancellable->priv->mutex);
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}
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/**
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@ -265,28 +272,17 @@ g_cancellable_reset (GCancellable *cancellable)
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g_return_if_fail (G_IS_CANCELLABLE (cancellable));
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g_mutex_lock (&cancellable_mutex);
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priv = cancellable->priv;
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while (priv->cancelled_running || priv->cancelled_emissions > 0)
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{
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if (priv->cancelled_running)
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priv->cancelled_running_waiting = TRUE;
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g_mutex_lock (&priv->mutex);
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if (priv->cancelled_emissions > 0)
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priv->cancelled_emissions_waiting = TRUE;
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g_cond_wait (&cancellable_cond, &cancellable_mutex);
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}
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if (g_atomic_int_exchange (&priv->cancelled, FALSE))
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if (g_atomic_int_compare_and_exchange (&priv->cancelled, TRUE, FALSE))
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{
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if (priv->wakeup)
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GLIB_PRIVATE_CALL (g_wakeup_acknowledge) (priv->wakeup);
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}
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g_mutex_unlock (&cancellable_mutex);
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g_mutex_unlock (&priv->mutex);
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}
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/**
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@ -404,26 +400,29 @@ g_cancellable_get_fd (GCancellable *cancellable)
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gboolean
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g_cancellable_make_pollfd (GCancellable *cancellable, GPollFD *pollfd)
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{
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GCancellablePrivate *priv;
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g_return_val_if_fail (pollfd != NULL, FALSE);
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if (cancellable == NULL)
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return FALSE;
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g_return_val_if_fail (G_IS_CANCELLABLE (cancellable), FALSE);
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g_mutex_lock (&cancellable_mutex);
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priv = cancellable->priv;
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cancellable->priv->fd_refcount++;
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g_mutex_lock (&priv->mutex);
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if (cancellable->priv->wakeup == NULL)
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if ((priv->fd_refcount++) == 0)
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{
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cancellable->priv->wakeup = GLIB_PRIVATE_CALL (g_wakeup_new) ();
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priv->wakeup = GLIB_PRIVATE_CALL (g_wakeup_new) ();
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if (g_atomic_int_get (&cancellable->priv->cancelled))
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GLIB_PRIVATE_CALL (g_wakeup_signal) (cancellable->priv->wakeup);
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if (g_atomic_int_get (&priv->cancelled))
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GLIB_PRIVATE_CALL (g_wakeup_signal) (priv->wakeup);
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}
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GLIB_PRIVATE_CALL (g_wakeup_get_pollfd) (cancellable->priv->wakeup, pollfd);
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g_assert (priv->wakeup);
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GLIB_PRIVATE_CALL (g_wakeup_get_pollfd) (priv->wakeup, pollfd);
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g_mutex_unlock (&cancellable_mutex);
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g_mutex_unlock (&priv->mutex);
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return TRUE;
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}
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@ -447,26 +446,22 @@ g_cancellable_make_pollfd (GCancellable *cancellable, GPollFD *pollfd)
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void
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g_cancellable_release_fd (GCancellable *cancellable)
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{
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GCancellablePrivate *priv;
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if (cancellable == NULL)
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return;
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g_return_if_fail (G_IS_CANCELLABLE (cancellable));
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priv = cancellable->priv;
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g_mutex_lock (&cancellable->priv->mutex);
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g_mutex_lock (&cancellable_mutex);
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g_assert (priv->fd_refcount > 0);
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g_assert (cancellable->priv->fd_refcount > 0);
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priv->fd_refcount--;
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if (priv->fd_refcount == 0)
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if ((cancellable->priv->fd_refcount--) == 1)
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{
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GLIB_PRIVATE_CALL (g_wakeup_free) (priv->wakeup);
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priv->wakeup = NULL;
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GLIB_PRIVATE_CALL (g_wakeup_free) (cancellable->priv->wakeup);
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cancellable->priv->wakeup = NULL;
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}
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g_mutex_unlock (&cancellable_mutex);
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g_mutex_unlock (&cancellable->priv->mutex);
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}
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/**
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@ -495,37 +490,35 @@ g_cancellable_cancel (GCancellable *cancellable)
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{
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GCancellablePrivate *priv;
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if (cancellable == NULL || g_cancellable_is_cancelled (cancellable))
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if (cancellable == NULL || g_atomic_int_get (&cancellable->priv->cancelled))
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return;
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priv = cancellable->priv;
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g_mutex_lock (&cancellable_mutex);
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/* We add a reference before locking, to avoid that potential toggle
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* notifications on the object might happen while we're locked.
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*/
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g_object_ref (cancellable);
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g_mutex_lock (&priv->mutex);
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if (g_atomic_int_exchange (&priv->cancelled, TRUE))
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if (!g_atomic_int_compare_and_exchange (&priv->cancelled, FALSE, TRUE))
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{
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g_mutex_unlock (&cancellable_mutex);
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g_mutex_unlock (&priv->mutex);
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g_object_unref (cancellable);
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return;
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}
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priv->cancelled_running = TRUE;
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g_atomic_int_inc (&priv->cancelled_running);
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if (priv->wakeup)
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GLIB_PRIVATE_CALL (g_wakeup_signal) (priv->wakeup);
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g_mutex_unlock (&cancellable_mutex);
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g_object_ref (cancellable);
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g_signal_emit (cancellable, signals[CANCELLED], 0);
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g_mutex_lock (&cancellable_mutex);
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priv->cancelled_running = FALSE;
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if (priv->cancelled_running_waiting)
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if (g_atomic_int_dec_and_test (&priv->cancelled_running))
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g_cond_broadcast (&cancellable_cond);
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priv->cancelled_running_waiting = FALSE;
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g_mutex_unlock (&cancellable_mutex);
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g_mutex_unlock (&priv->mutex);
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g_object_unref (cancellable);
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}
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@ -571,7 +564,7 @@ g_cancellable_connect (GCancellable *cancellable,
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g_return_val_if_fail (G_IS_CANCELLABLE (cancellable), 0);
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g_mutex_lock (&cancellable_mutex);
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g_mutex_lock (&cancellable->priv->mutex);
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if (g_atomic_int_get (&cancellable->priv->cancelled))
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{
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@ -581,23 +574,10 @@ g_cancellable_connect (GCancellable *cancellable,
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_callback = (void *)callback;
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id = 0;
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cancellable->priv->cancelled_emissions++;
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g_mutex_unlock (&cancellable_mutex);
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_callback (cancellable, data);
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if (data_destroy_func)
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data_destroy_func (data);
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g_mutex_lock (&cancellable_mutex);
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if (cancellable->priv->cancelled_emissions_waiting)
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g_cond_broadcast (&cancellable_cond);
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cancellable->priv->cancelled_emissions--;
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g_mutex_unlock (&cancellable_mutex);
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}
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else
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{
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@ -605,10 +585,9 @@ g_cancellable_connect (GCancellable *cancellable,
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callback, data,
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(GClosureNotify) data_destroy_func,
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G_CONNECT_DEFAULT);
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g_mutex_unlock (&cancellable_mutex);
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}
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g_mutex_unlock (&cancellable->priv->mutex);
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return id;
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}
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@ -644,33 +623,26 @@ g_cancellable_disconnect (GCancellable *cancellable,
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if (handler_id == 0 || cancellable == NULL)
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return;
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g_mutex_lock (&cancellable_mutex);
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priv = cancellable->priv;
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while (priv->cancelled_running || priv->cancelled_emissions)
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{
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if (priv->cancelled_running)
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priv->cancelled_running_waiting = TRUE;
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g_mutex_lock (&priv->mutex);
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if (priv->cancelled_emissions)
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priv->cancelled_emissions_waiting = TRUE;
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while (g_atomic_int_get (&priv->cancelled_running) != 0)
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g_cond_wait (&cancellable_cond, &priv->mutex);
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g_cond_wait (&cancellable_cond, &cancellable_mutex);
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}
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g_mutex_unlock (&priv->mutex);
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g_signal_handler_disconnect (cancellable, handler_id);
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g_mutex_unlock (&cancellable_mutex);
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}
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typedef struct {
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GSource source;
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/* Atomic: */
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GCancellable *cancellable;
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gulong cancelled_handler;
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/* Protected by cancellable_mutex: */
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gboolean resurrected_during_cancellation;
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/* Atomic: */
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gboolean cancelled_callback_called;
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} GCancellableSource;
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/*
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@ -691,26 +663,32 @@ cancellable_source_cancelled (GCancellable *cancellable,
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GSource *source = user_data;
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GCancellableSource *cancellable_source = (GCancellableSource *) source;
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g_mutex_lock (&cancellable_mutex);
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/* Drop the reference added in cancellable_source_dispose(); see the comment there.
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* The reference must be dropped after unlocking @cancellable_mutex since
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* it could be the final reference, and the dispose function takes
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* @cancellable_mutex. */
|
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if (cancellable_source->resurrected_during_cancellation)
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{
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cancellable_source->resurrected_during_cancellation = FALSE;
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g_mutex_unlock (&cancellable_mutex);
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g_source_unref (source);
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return;
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}
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|
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g_source_ref (source);
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g_mutex_unlock (&cancellable_mutex);
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g_source_set_ready_time (source, 0);
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|
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g_assert (g_atomic_int_compare_and_exchange (
|
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&cancellable_source->cancelled_callback_called, FALSE, TRUE));
|
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|
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g_source_unref (source);
|
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}
|
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|
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static gboolean
|
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cancellable_source_prepare (GSource *source,
|
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gint *timeout)
|
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{
|
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GCancellableSource *cancellable_source = (GCancellableSource *) source;
|
||||
GCancellable *cancellable;
|
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|
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if (timeout)
|
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*timeout = -1;
|
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|
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cancellable = g_atomic_pointer_get (&cancellable_source->cancellable);
|
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if (cancellable && !g_atomic_int_get (&cancellable->priv->cancelled_running))
|
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g_atomic_int_set (&cancellable_source->cancelled_callback_called, FALSE);
|
||||
|
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return FALSE;
|
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}
|
||||
|
||||
static gboolean
|
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cancellable_source_dispatch (GSource *source,
|
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GSourceFunc callback,
|
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@ -727,12 +705,13 @@ static void
|
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cancellable_source_dispose (GSource *source)
|
||||
{
|
||||
GCancellableSource *cancellable_source = (GCancellableSource *)source;
|
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GCancellable *cancellable;
|
||||
|
||||
g_mutex_lock (&cancellable_mutex);
|
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cancellable = g_atomic_pointer_exchange (&cancellable_source->cancellable, NULL);
|
||||
|
||||
if (cancellable_source->cancellable)
|
||||
if (cancellable)
|
||||
{
|
||||
if (cancellable_source->cancellable->priv->cancelled_running)
|
||||
if (g_atomic_int_get (&cancellable->priv->cancelled_running))
|
||||
{
|
||||
/* There can be a race here: if thread A has called
|
||||
* g_cancellable_cancel() and has got as far as committing to call
|
||||
@ -744,21 +723,21 @@ cancellable_source_dispose (GSource *source)
|
||||
* will then be left in a state where it’s committed to using a
|
||||
* dangling GCancellableSource pointer.
|
||||
*
|
||||
* Eliminate that race by resurrecting the #GSource temporarily, and
|
||||
* then dropping that reference in cancellable_source_cancelled(),
|
||||
* which should be guaranteed to fire because we’re inside a
|
||||
* @cancelled_running block.
|
||||
* Eliminate that race by waiting to ensure that our cancelled
|
||||
* callback has been called, keeping a temporary ref, so that
|
||||
* there's no risk that we're unreffing something that is still
|
||||
* going to be used.
|
||||
*/
|
||||
|
||||
g_source_ref (source);
|
||||
cancellable_source->resurrected_during_cancellation = TRUE;
|
||||
while (!g_atomic_int_get (&cancellable_source->cancelled_callback_called))
|
||||
;
|
||||
g_source_unref (source);
|
||||
}
|
||||
|
||||
g_clear_signal_handler (&cancellable_source->cancelled_handler,
|
||||
cancellable_source->cancellable);
|
||||
g_clear_object (&cancellable_source->cancellable);
|
||||
g_clear_signal_handler (&cancellable_source->cancelled_handler, cancellable);
|
||||
g_object_unref (cancellable);
|
||||
}
|
||||
|
||||
g_mutex_unlock (&cancellable_mutex);
|
||||
}
|
||||
|
||||
static gboolean
|
||||
@ -787,7 +766,7 @@ cancellable_source_closure_callback (GCancellable *cancellable,
|
||||
|
||||
static GSourceFuncs cancellable_source_funcs =
|
||||
{
|
||||
NULL,
|
||||
cancellable_source_prepare,
|
||||
NULL,
|
||||
cancellable_source_dispatch,
|
||||
NULL,
|
||||
|
||||
@ -262,11 +262,6 @@ threaded_dispose_thread_cb (gpointer user_data)
|
||||
static void
|
||||
test_cancellable_source_threaded_dispose (void)
|
||||
{
|
||||
#ifdef _GLIB_ADDRESS_SANITIZER
|
||||
g_test_incomplete ("FIXME: Leaks lots of GCancellableSource objects, see glib#2309");
|
||||
(void) cancelled_cb;
|
||||
(void) threaded_dispose_thread_cb;
|
||||
#else
|
||||
ThreadedDisposeData data;
|
||||
GThread *thread = NULL;
|
||||
guint i;
|
||||
@ -276,6 +271,10 @@ test_cancellable_source_threaded_dispose (void)
|
||||
"(in one thread) and cancelling the GCancellable it refers "
|
||||
"to (in another thread)");
|
||||
g_test_bug ("https://gitlab.gnome.org/GNOME/glib/issues/1841");
|
||||
#ifdef _GLIB_ADDRESS_SANITIZER
|
||||
g_test_message ("We also ensure that no GCancellableSource are leaked");
|
||||
g_test_bug ("https://gitlab.gnome.org/GNOME/glib/issues/2309");
|
||||
#endif
|
||||
|
||||
#ifdef ENABLE_VALGRIND
|
||||
if (RUNNING_ON_VALGRIND)
|
||||
@ -341,7 +340,6 @@ test_cancellable_source_threaded_dispose (void)
|
||||
g_cond_clear (&data.cond);
|
||||
|
||||
g_ptr_array_unref (cancellables_pending_unref);
|
||||
#endif
|
||||
}
|
||||
|
||||
static void
|
||||
@ -796,6 +794,63 @@ test_cancellable_cancel_reset_connect_races (void)
|
||||
g_object_unref (cancellable);
|
||||
}
|
||||
|
||||
static gboolean
|
||||
source_cancelled_counter_cb (GCancellable *cancellable,
|
||||
gpointer user_data)
|
||||
{
|
||||
guint *n_calls = user_data;
|
||||
|
||||
*n_calls = *n_calls + 1;
|
||||
|
||||
return G_SOURCE_CONTINUE;
|
||||
}
|
||||
|
||||
static void
|
||||
test_cancellable_source_can_be_fired_multiple_times (void)
|
||||
{
|
||||
GCancellable *cancellable;
|
||||
GSource *source;
|
||||
guint n_calls = 0;
|
||||
|
||||
g_test_summary ("Test a cancellable source callback can be called multiple times");
|
||||
g_test_bug ("https://gitlab.gnome.org/GNOME/glib/issues/774");
|
||||
|
||||
cancellable = g_cancellable_new ();
|
||||
source = g_cancellable_source_new (cancellable);
|
||||
|
||||
g_source_set_callback (source, G_SOURCE_FUNC (source_cancelled_counter_cb),
|
||||
&n_calls, NULL);
|
||||
g_source_attach (source, NULL);
|
||||
|
||||
g_cancellable_cancel (cancellable);
|
||||
g_assert_cmpuint (n_calls, ==, 0);
|
||||
|
||||
while (g_main_context_pending (NULL))
|
||||
g_main_context_iteration (NULL, TRUE);
|
||||
|
||||
g_assert_cmpuint (n_calls, ==, 1);
|
||||
|
||||
g_cancellable_cancel (cancellable);
|
||||
|
||||
g_timeout_add_once (100, g_free, NULL);
|
||||
while (g_main_context_pending (NULL))
|
||||
g_main_context_iteration (NULL, TRUE);
|
||||
|
||||
g_assert_cmpuint (n_calls, ==, 1);
|
||||
|
||||
g_cancellable_reset (cancellable);
|
||||
g_cancellable_cancel (cancellable);
|
||||
g_assert_cmpuint (n_calls, ==, 1);
|
||||
|
||||
while (g_main_context_pending (NULL))
|
||||
g_main_context_iteration (NULL, TRUE);
|
||||
|
||||
g_assert_cmpuint (n_calls, ==, 2);
|
||||
|
||||
g_source_unref (source);
|
||||
g_object_unref (cancellable);
|
||||
}
|
||||
|
||||
int
|
||||
main (int argc, char *argv[])
|
||||
{
|
||||
@ -811,6 +866,7 @@ main (int argc, char *argv[])
|
||||
g_test_add_func ("/cancellable/cancel-reset-races", test_cancellable_cancel_reset_races);
|
||||
g_test_add_func ("/cancellable/cancel-reset-connect-races", test_cancellable_cancel_reset_connect_races);
|
||||
g_test_add_func ("/cancellable-source/threaded-dispose", test_cancellable_source_threaded_dispose);
|
||||
g_test_add_func ("/cancellable-source/can-be-fired-multiple-times", test_cancellable_source_can_be_fired_multiple_times);
|
||||
|
||||
return g_test_run ();
|
||||
}
|
||||
|
||||
@ -1007,17 +1007,16 @@ test_dbus_roundtrip (void)
|
||||
static void
|
||||
test_dbus_peer_roundtrip (void)
|
||||
{
|
||||
#ifdef _GLIB_ADDRESS_SANITIZER
|
||||
g_test_incomplete ("FIXME: Leaks a GCancellableSource, see glib#2313");
|
||||
(void) peer_connection_up;
|
||||
(void) peer_connection_down;
|
||||
#else
|
||||
PeerConnection peer;
|
||||
|
||||
#ifdef _GLIB_ADDRESS_SANITIZER
|
||||
g_test_message ("Ensure that no GCancellableSource are leaked");
|
||||
g_test_bug ("https://gitlab.gnome.org/GNOME/glib/issues/2313");
|
||||
#endif
|
||||
|
||||
peer_connection_up (&peer);
|
||||
do_roundtrip (peer.server_connection, peer.client_connection);
|
||||
peer_connection_down (&peer);
|
||||
#endif
|
||||
}
|
||||
|
||||
static gint items_changed_count;
|
||||
@ -1146,17 +1145,16 @@ test_dbus_subscriptions (void)
|
||||
static void
|
||||
test_dbus_peer_subscriptions (void)
|
||||
{
|
||||
#ifdef _GLIB_ADDRESS_SANITIZER
|
||||
g_test_incomplete ("FIXME: Leaks a GCancellableSource, see glib#2313");
|
||||
(void) peer_connection_up;
|
||||
(void) peer_connection_down;
|
||||
#else
|
||||
PeerConnection peer;
|
||||
|
||||
#ifdef _GLIB_ADDRESS_SANITIZER
|
||||
g_test_message ("Ensure that no GCancellableSource are leaked");
|
||||
g_test_bug ("https://gitlab.gnome.org/GNOME/glib/issues/2313");
|
||||
#endif
|
||||
|
||||
peer_connection_up (&peer);
|
||||
do_subscriptions (peer.server_connection, peer.client_connection);
|
||||
peer_connection_down (&peer);
|
||||
#endif
|
||||
}
|
||||
|
||||
static void
|
||||
|
||||
Loading…
Reference in New Issue
Block a user