Revision 72ed9e04394746495f021133915e6bf7c1d3b5b1 authored by Michael Catanzaro on 25 May 2019, 23:30:12 UTC, committed by Michael Catanzaro on 26 May 2019, 15:17:15 UTC
The GTask must be destroyed on the thread that is running its GMainContext, i.e. the thread that started the task. It must never be destroyed on the actual task thread when running with g_task_run_in_thread(), because when it is destroyed, it will unref its source object and destroy its user data (if a GDestroyNotify was set for the data using g_task_set_task_data()). The source object and task data might not be safe to destroy on a secondary thread, though, so this is incorrect. We have to ensure they are destroyed on the task's context's thread. There are different ways we could do this, but the simplest by far is to ensure the task thread has unreffed the task before the context's thread executes the callback. And that is simple enough to do using a condition variable. We have to keep a static global map of all GTasks with outstanding task threads, which is slightly unfortunate, but we already have a bunch of global data in this file for managing the thread pool, and the map will only contain tasks that are currently running in threads, so it should be small. Fixes #1346
1 parent e10eff1
gresolver.h
/* GIO - GLib Input, Output and Streaming Library
*
* Copyright (C) 2008 Red Hat, Inc.
* Copyright (C) 2018 Igalia S.L.
*
* 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 2.1 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, see <http://www.gnu.org/licenses/>.
*/
#ifndef __G_RESOLVER_H__
#define __G_RESOLVER_H__
#if !defined (__GIO_GIO_H_INSIDE__) && !defined (GIO_COMPILATION)
#error "Only <gio/gio.h> can be included directly."
#endif
#include <gio/giotypes.h>
G_BEGIN_DECLS
#define G_TYPE_RESOLVER (g_resolver_get_type ())
#define G_RESOLVER(o) (G_TYPE_CHECK_INSTANCE_CAST ((o), G_TYPE_RESOLVER, GResolver))
#define G_RESOLVER_CLASS(k) (G_TYPE_CHECK_CLASS_CAST((k), G_TYPE_RESOLVER, GResolverClass))
#define G_IS_RESOLVER(o) (G_TYPE_CHECK_INSTANCE_TYPE ((o), G_TYPE_RESOLVER))
#define G_IS_RESOLVER_CLASS(k) (G_TYPE_CHECK_CLASS_TYPE ((k), G_TYPE_RESOLVER))
#define G_RESOLVER_GET_CLASS(o) (G_TYPE_INSTANCE_GET_CLASS ((o), G_TYPE_RESOLVER, GResolverClass))
typedef struct _GResolverPrivate GResolverPrivate;
typedef struct _GResolverClass GResolverClass;
struct _GResolver {
GObject parent_instance;
GResolverPrivate *priv;
};
/**
* GResolverNameLookupFlags:
* @G_RESOLVER_NAME_LOOKUP_FLAGS_DEFAULT: default behavior (same as g_resolver_lookup_by_name())
* @G_RESOLVER_NAME_LOOKUP_FLAGS_IPV4_ONLY: only resolve ipv4 addresses
* @G_RESOLVER_NAME_LOOKUP_FLAGS_IPV6_ONLY: only resolve ipv6 addresses
*
* Flags to modify lookup behavior.
*
* Since: 2.60
*/
typedef enum {
G_RESOLVER_NAME_LOOKUP_FLAGS_DEFAULT = 0,
G_RESOLVER_NAME_LOOKUP_FLAGS_IPV4_ONLY = 1 << 0,
G_RESOLVER_NAME_LOOKUP_FLAGS_IPV6_ONLY = 1 << 1,
} GResolverNameLookupFlags;
struct _GResolverClass {
GObjectClass parent_class;
/* Signals */
void ( *reload) (GResolver *resolver);
/* Virtual methods */
GList * ( *lookup_by_name) (GResolver *resolver,
const gchar *hostname,
GCancellable *cancellable,
GError **error);
void ( *lookup_by_name_async) (GResolver *resolver,
const gchar *hostname,
GCancellable *cancellable,
GAsyncReadyCallback callback,
gpointer user_data);
GList * ( *lookup_by_name_finish) (GResolver *resolver,
GAsyncResult *result,
GError **error);
gchar * ( *lookup_by_address) (GResolver *resolver,
GInetAddress *address,
GCancellable *cancellable,
GError **error);
void ( *lookup_by_address_async) (GResolver *resolver,
GInetAddress *address,
GCancellable *cancellable,
GAsyncReadyCallback callback,
gpointer user_data);
gchar * ( *lookup_by_address_finish) (GResolver *resolver,
GAsyncResult *result,
GError **error);
GList * ( *lookup_service) (GResolver *resolver,
const gchar *rrname,
GCancellable *cancellable,
GError **error);
void ( *lookup_service_async) (GResolver *resolver,
const gchar *rrname,
GCancellable *cancellable,
GAsyncReadyCallback callback,
gpointer user_data);
GList * ( *lookup_service_finish) (GResolver *resolver,
GAsyncResult *result,
GError **error);
GList * ( *lookup_records) (GResolver *resolver,
const gchar *rrname,
GResolverRecordType record_type,
GCancellable *cancellable,
GError **error);
void ( *lookup_records_async) (GResolver *resolver,
const gchar *rrname,
GResolverRecordType record_type,
GCancellable *cancellable,
GAsyncReadyCallback callback,
gpointer user_data);
GList * ( *lookup_records_finish) (GResolver *resolver,
GAsyncResult *result,
GError **error);
/**
* GResolverClass::lookup_by_name_with_flags_async:
* @resolver: a #GResolver
* @hostname: the hostname to resolve
* @flags: extra #GResolverNameLookupFlags to modify the lookup
* @cancellable: (nullable): a #GCancellable
* @callback: (scope async): a #GAsyncReadyCallback to call when completed
* @user_data: (closure): data to pass to @callback
*
* Asynchronous version of GResolverClass::lookup_by_name_with_flags
*
* GResolverClass::lookup_by_name_with_flags_finish will be called to get
* the result.
*
* Since: 2.60
*/
void ( *lookup_by_name_with_flags_async) (GResolver *resolver,
const gchar *hostname,
GResolverNameLookupFlags flags,
GCancellable *cancellable,
GAsyncReadyCallback callback,
gpointer user_data);
/**
* GResolverClass::lookup_by_name_with_flags_finish:
* @resolver: a #GResolver
* @result: a #GAsyncResult
* @error: (nullable): a pointer to a %NULL #GError
*
* Gets the result from GResolverClass::lookup_by_name_with_flags_async
*
* Returns: (element-type GInetAddress) (transfer full): List of #GInetAddress.
* Since: 2.60
*/
GList * ( *lookup_by_name_with_flags_finish) (GResolver *resolver,
GAsyncResult *result,
GError **error);
/**
* GResolverClass::lookup_by_name_with_flags:
* @resolver: a #GResolver
* @hostname: the hostname to resolve
* @flags: extra #GResolverNameLookupFlags to modify the lookup
* @cancellable: (nullable): a #GCancellable
* @error: (nullable): a pointer to a %NULL #GError
*
* This is identical to GResolverClass::lookup_by_name except it takes
* @flags which modifies the behavior of the lookup. See #GResolverNameLookupFlags
* for more details.
*
* Returns: (element-type GInetAddress) (transfer full): List of #GInetAddress.
* Since: 2.60
*/
GList * ( *lookup_by_name_with_flags) (GResolver *resolver,
const gchar *hostname,
GResolverNameLookupFlags flags,
GCancellable *cancellable,
GError **error);
};
GLIB_AVAILABLE_IN_ALL
GType g_resolver_get_type (void) G_GNUC_CONST;
GLIB_AVAILABLE_IN_ALL
GResolver *g_resolver_get_default (void);
GLIB_AVAILABLE_IN_ALL
void g_resolver_set_default (GResolver *resolver);
GLIB_AVAILABLE_IN_ALL
GList *g_resolver_lookup_by_name (GResolver *resolver,
const gchar *hostname,
GCancellable *cancellable,
GError **error);
GLIB_AVAILABLE_IN_ALL
void g_resolver_lookup_by_name_async (GResolver *resolver,
const gchar *hostname,
GCancellable *cancellable,
GAsyncReadyCallback callback,
gpointer user_data);
GLIB_AVAILABLE_IN_ALL
GList *g_resolver_lookup_by_name_finish (GResolver *resolver,
GAsyncResult *result,
GError **error);
GLIB_AVAILABLE_IN_2_60
void g_resolver_lookup_by_name_with_flags_async (GResolver *resolver,
const gchar *hostname,
GResolverNameLookupFlags flags,
GCancellable *cancellable,
GAsyncReadyCallback callback,
gpointer user_data);
GLIB_AVAILABLE_IN_2_60
GList *g_resolver_lookup_by_name_with_flags_finish (GResolver *resolver,
GAsyncResult *result,
GError **error);
GLIB_AVAILABLE_IN_2_60
GList *g_resolver_lookup_by_name_with_flags (GResolver *resolver,
const gchar *hostname,
GResolverNameLookupFlags flags,
GCancellable *cancellable,
GError **error);
GLIB_AVAILABLE_IN_ALL
void g_resolver_free_addresses (GList *addresses);
GLIB_AVAILABLE_IN_ALL
gchar *g_resolver_lookup_by_address (GResolver *resolver,
GInetAddress *address,
GCancellable *cancellable,
GError **error);
GLIB_AVAILABLE_IN_ALL
void g_resolver_lookup_by_address_async (GResolver *resolver,
GInetAddress *address,
GCancellable *cancellable,
GAsyncReadyCallback callback,
gpointer user_data);
GLIB_AVAILABLE_IN_ALL
gchar *g_resolver_lookup_by_address_finish (GResolver *resolver,
GAsyncResult *result,
GError **error);
GLIB_AVAILABLE_IN_ALL
GList *g_resolver_lookup_service (GResolver *resolver,
const gchar *service,
const gchar *protocol,
const gchar *domain,
GCancellable *cancellable,
GError **error);
GLIB_AVAILABLE_IN_ALL
void g_resolver_lookup_service_async (GResolver *resolver,
const gchar *service,
const gchar *protocol,
const gchar *domain,
GCancellable *cancellable,
GAsyncReadyCallback callback,
gpointer user_data);
GLIB_AVAILABLE_IN_ALL
GList *g_resolver_lookup_service_finish (GResolver *resolver,
GAsyncResult *result,
GError **error);
GLIB_AVAILABLE_IN_2_34
GList *g_resolver_lookup_records (GResolver *resolver,
const gchar *rrname,
GResolverRecordType record_type,
GCancellable *cancellable,
GError **error);
GLIB_AVAILABLE_IN_2_34
void g_resolver_lookup_records_async (GResolver *resolver,
const gchar *rrname,
GResolverRecordType record_type,
GCancellable *cancellable,
GAsyncReadyCallback callback,
gpointer user_data);
GLIB_AVAILABLE_IN_2_34
GList *g_resolver_lookup_records_finish (GResolver *resolver,
GAsyncResult *result,
GError **error);
GLIB_AVAILABLE_IN_ALL
void g_resolver_free_targets (GList *targets);
/**
* G_RESOLVER_ERROR:
*
* Error domain for #GResolver. Errors in this domain will be from the
* #GResolverError enumeration. See #GError for more information on
* error domains.
*/
#define G_RESOLVER_ERROR (g_resolver_error_quark ())
GLIB_AVAILABLE_IN_ALL
GQuark g_resolver_error_quark (void);
G_END_DECLS
#endif /* __G_RESOLVER_H__ */
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