mirror of
https://gitlab.gnome.org/GNOME/glib.git
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726eca7c89
These functions can be used to initalize pointer-type variables rather than a gsize. This is required to support CHERI-enabled platforms where gsize cannot be used to store pointers. Follow-up changes will migrate the uses of g_once_init that store pointers to the new API Helps: https://gitlab.gnome.org/GNOME/glib/-/issues/2842
629 lines
20 KiB
C
629 lines
20 KiB
C
/* GLIB - Library of useful routines for C programming
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* Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
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*
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* SPDX-License-Identifier: LGPL-2.1-or-later
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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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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, see <http://www.gnu.org/licenses/>.
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*/
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/*
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* Modified by the GLib Team and others 1997-2000. See the AUTHORS
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* file for a list of people on the GLib Team. See the ChangeLog
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* files for a list of changes. These files are distributed with
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* GLib at ftp://ftp.gtk.org/pub/gtk/.
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*/
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#ifndef __G_THREAD_H__
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#define __G_THREAD_H__
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#if !defined (__GLIB_H_INSIDE__) && !defined (GLIB_COMPILATION)
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#error "Only <glib.h> can be included directly."
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#endif
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#include <glib/gatomic.h>
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#include <glib/gerror.h>
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#include <glib/gutils.h>
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G_BEGIN_DECLS
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#define G_THREAD_ERROR g_thread_error_quark ()
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GLIB_AVAILABLE_IN_ALL
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GQuark g_thread_error_quark (void);
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typedef enum
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{
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G_THREAD_ERROR_AGAIN /* Resource temporarily unavailable */
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} GThreadError;
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typedef gpointer (*GThreadFunc) (gpointer data);
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typedef struct _GThread GThread;
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typedef union _GMutex GMutex;
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typedef struct _GRecMutex GRecMutex;
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typedef struct _GRWLock GRWLock;
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typedef struct _GCond GCond;
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typedef struct _GPrivate GPrivate;
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typedef struct _GOnce GOnce;
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union _GMutex
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{
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/*< private >*/
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gpointer p;
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guint i[2];
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};
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struct _GRWLock
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{
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/*< private >*/
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gpointer p;
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guint i[2];
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};
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struct _GCond
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{
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/*< private >*/
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gpointer p;
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guint i[2];
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};
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struct _GRecMutex
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{
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/*< private >*/
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gpointer p;
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guint i[2];
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};
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#define G_PRIVATE_INIT(notify) { NULL, (notify), { NULL, NULL } }
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struct _GPrivate
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{
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/*< private >*/
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gpointer p;
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GDestroyNotify notify;
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gpointer future[2];
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};
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typedef enum
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{
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G_ONCE_STATUS_NOTCALLED,
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G_ONCE_STATUS_PROGRESS,
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G_ONCE_STATUS_READY
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} GOnceStatus;
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#define G_ONCE_INIT { G_ONCE_STATUS_NOTCALLED, NULL }
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struct _GOnce
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{
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volatile GOnceStatus status;
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volatile gpointer retval;
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};
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#define G_LOCK_NAME(name) g__ ## name ## _lock
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#define G_LOCK_DEFINE_STATIC(name) static G_LOCK_DEFINE (name)
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#define G_LOCK_DEFINE(name) GMutex G_LOCK_NAME (name)
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#define G_LOCK_EXTERN(name) extern GMutex G_LOCK_NAME (name)
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#ifdef G_DEBUG_LOCKS
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# define G_LOCK(name) G_STMT_START{ \
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g_log (G_LOG_DOMAIN, G_LOG_LEVEL_DEBUG, \
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"file %s: line %d (%s): locking: %s ", \
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__FILE__, __LINE__, G_STRFUNC, \
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#name); \
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g_mutex_lock (&G_LOCK_NAME (name)); \
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}G_STMT_END
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# define G_UNLOCK(name) G_STMT_START{ \
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g_log (G_LOG_DOMAIN, G_LOG_LEVEL_DEBUG, \
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"file %s: line %d (%s): unlocking: %s ", \
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__FILE__, __LINE__, G_STRFUNC, \
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#name); \
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g_mutex_unlock (&G_LOCK_NAME (name)); \
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}G_STMT_END
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# define G_TRYLOCK(name) \
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(g_log (G_LOG_DOMAIN, G_LOG_LEVEL_DEBUG, \
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"file %s: line %d (%s): try locking: %s ", \
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__FILE__, __LINE__, G_STRFUNC, \
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#name), g_mutex_trylock (&G_LOCK_NAME (name)))
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#else /* !G_DEBUG_LOCKS */
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# define G_LOCK(name) g_mutex_lock (&G_LOCK_NAME (name))
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# define G_UNLOCK(name) g_mutex_unlock (&G_LOCK_NAME (name))
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# define G_TRYLOCK(name) g_mutex_trylock (&G_LOCK_NAME (name))
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#endif /* !G_DEBUG_LOCKS */
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GLIB_AVAILABLE_IN_2_32
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GThread * g_thread_ref (GThread *thread);
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GLIB_AVAILABLE_IN_2_32
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void g_thread_unref (GThread *thread);
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GLIB_AVAILABLE_IN_2_32
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GThread * g_thread_new (const gchar *name,
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GThreadFunc func,
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gpointer data);
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GLIB_AVAILABLE_IN_2_32
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GThread * g_thread_try_new (const gchar *name,
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GThreadFunc func,
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gpointer data,
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GError **error);
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GLIB_AVAILABLE_IN_ALL
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GThread * g_thread_self (void);
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G_NORETURN GLIB_AVAILABLE_IN_ALL
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void g_thread_exit (gpointer retval);
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GLIB_AVAILABLE_IN_ALL
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gpointer g_thread_join (GThread *thread);
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GLIB_AVAILABLE_IN_ALL
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void g_thread_yield (void);
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GLIB_AVAILABLE_IN_2_32
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void g_mutex_init (GMutex *mutex);
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GLIB_AVAILABLE_IN_2_32
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void g_mutex_clear (GMutex *mutex);
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GLIB_AVAILABLE_IN_ALL
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void g_mutex_lock (GMutex *mutex);
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GLIB_AVAILABLE_IN_ALL
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gboolean g_mutex_trylock (GMutex *mutex);
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GLIB_AVAILABLE_IN_ALL
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void g_mutex_unlock (GMutex *mutex);
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GLIB_AVAILABLE_IN_2_32
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void g_rw_lock_init (GRWLock *rw_lock);
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GLIB_AVAILABLE_IN_2_32
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void g_rw_lock_clear (GRWLock *rw_lock);
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GLIB_AVAILABLE_IN_2_32
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void g_rw_lock_writer_lock (GRWLock *rw_lock);
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GLIB_AVAILABLE_IN_2_32
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gboolean g_rw_lock_writer_trylock (GRWLock *rw_lock);
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GLIB_AVAILABLE_IN_2_32
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void g_rw_lock_writer_unlock (GRWLock *rw_lock);
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GLIB_AVAILABLE_IN_2_32
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void g_rw_lock_reader_lock (GRWLock *rw_lock);
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GLIB_AVAILABLE_IN_2_32
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gboolean g_rw_lock_reader_trylock (GRWLock *rw_lock);
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GLIB_AVAILABLE_IN_2_32
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void g_rw_lock_reader_unlock (GRWLock *rw_lock);
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GLIB_AVAILABLE_IN_2_32
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void g_rec_mutex_init (GRecMutex *rec_mutex);
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GLIB_AVAILABLE_IN_2_32
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void g_rec_mutex_clear (GRecMutex *rec_mutex);
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GLIB_AVAILABLE_IN_2_32
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void g_rec_mutex_lock (GRecMutex *rec_mutex);
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GLIB_AVAILABLE_IN_2_32
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gboolean g_rec_mutex_trylock (GRecMutex *rec_mutex);
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GLIB_AVAILABLE_IN_2_32
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void g_rec_mutex_unlock (GRecMutex *rec_mutex);
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GLIB_AVAILABLE_IN_2_32
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void g_cond_init (GCond *cond);
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GLIB_AVAILABLE_IN_2_32
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void g_cond_clear (GCond *cond);
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GLIB_AVAILABLE_IN_ALL
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void g_cond_wait (GCond *cond,
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GMutex *mutex);
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GLIB_AVAILABLE_IN_ALL
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void g_cond_signal (GCond *cond);
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GLIB_AVAILABLE_IN_ALL
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void g_cond_broadcast (GCond *cond);
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GLIB_AVAILABLE_IN_2_32
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gboolean g_cond_wait_until (GCond *cond,
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GMutex *mutex,
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gint64 end_time);
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GLIB_AVAILABLE_IN_ALL
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gpointer g_private_get (GPrivate *key);
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GLIB_AVAILABLE_IN_ALL
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void g_private_set (GPrivate *key,
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gpointer value);
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GLIB_AVAILABLE_IN_2_32
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void g_private_replace (GPrivate *key,
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gpointer value);
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GLIB_AVAILABLE_IN_ALL
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gpointer g_once_impl (GOnce *once,
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GThreadFunc func,
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gpointer arg);
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GLIB_AVAILABLE_IN_ALL
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gboolean g_once_init_enter (volatile void *location);
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GLIB_AVAILABLE_IN_ALL
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void g_once_init_leave (volatile void *location,
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gsize result);
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GLIB_AVAILABLE_IN_2_80
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gboolean g_once_init_enter_pointer (void *location);
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GLIB_AVAILABLE_IN_2_80
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void g_once_init_leave_pointer (void *location,
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gpointer result);
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/* Use C11-style atomic extensions to check the fast path for status=ready. If
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* they are not available, fall back to using a mutex and condition variable in
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* g_once_impl().
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*
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* On the C11-style codepath, only the load of once->status needs to be atomic,
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* as the writes to it and once->retval in g_once_impl() are related by a
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* happens-before relation. Release-acquire semantics are defined such that any
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* atomic/non-atomic write which happens-before a store/release is guaranteed to
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* be seen by the load/acquire of the same atomic variable. */
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#if defined(G_ATOMIC_LOCK_FREE) && defined(__GCC_HAVE_SYNC_COMPARE_AND_SWAP_4) && defined(__ATOMIC_SEQ_CST)
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# define g_once(once, func, arg) \
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((__atomic_load_n (&(once)->status, __ATOMIC_ACQUIRE) == G_ONCE_STATUS_READY) ? \
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(once)->retval : \
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g_once_impl ((once), (func), (arg)))
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#else
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# define g_once(once, func, arg) g_once_impl ((once), (func), (arg))
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#endif
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#ifdef __GNUC__
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# define g_once_init_enter(location) \
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(G_GNUC_EXTENSION ({ \
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G_STATIC_ASSERT (sizeof *(location) == sizeof (gpointer)); \
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(void) (0 ? (gpointer) *(location) : NULL); \
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(!g_atomic_pointer_get (location) && \
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g_once_init_enter (location)); \
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}))
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# define g_once_init_leave(location, result) \
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(G_GNUC_EXTENSION ({ \
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G_STATIC_ASSERT (sizeof *(location) == sizeof (gpointer)); \
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0 ? (void) (*(location) = (result)) : (void) 0; \
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g_once_init_leave ((location), (gsize) (result)); \
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}))
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# define g_once_init_enter_pointer(location) \
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(G_GNUC_EXTENSION ({ \
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G_STATIC_ASSERT (sizeof *(location) == sizeof (gpointer)); \
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(void) (0 ? (gpointer) * (location) : NULL); \
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(!g_atomic_pointer_get (location) && \
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g_once_init_enter_pointer (location)); \
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})) GLIB_AVAILABLE_MACRO_IN_2_80
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# define g_once_init_leave_pointer(location, result) \
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(G_GNUC_EXTENSION ({ \
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G_STATIC_ASSERT (sizeof *(location) == sizeof (gpointer)); \
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0 ? (void) (*(location) = (result)) : (void) 0; \
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g_once_init_leave_pointer ((location), (gpointer) (guintptr) (result)); \
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})) GLIB_AVAILABLE_MACRO_IN_2_80
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#else
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# define g_once_init_enter(location) \
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(g_once_init_enter((location)))
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# define g_once_init_leave(location, result) \
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(g_once_init_leave((location), (gsize) (result)))
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# define g_once_init_enter_pointer(location) \
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(g_once_init_enter_pointer((location))) \
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GLIB_AVAILABLE_MACRO_IN_2_80
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# define g_once_init_leave_pointer(location, result) \
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(g_once_init_leave_pointer((location), (gpointer) (guintptr) (result))) \
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GLIB_AVAILABLE_MACRO_IN_2_80
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#endif
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GLIB_AVAILABLE_IN_2_36
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guint g_get_num_processors (void);
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/**
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* GMutexLocker:
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*
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* Opaque type. See g_mutex_locker_new() for details.
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* Since: 2.44
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*/
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typedef void GMutexLocker;
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/**
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* g_mutex_locker_new:
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* @mutex: a mutex to lock
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*
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* Lock @mutex and return a new #GMutexLocker. Unlock with
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* g_mutex_locker_free(). Using g_mutex_unlock() on @mutex
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* while a #GMutexLocker exists can lead to undefined behaviour.
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*
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* No allocation is performed, it is equivalent to a g_mutex_lock() call.
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*
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* This is intended to be used with g_autoptr(). Note that g_autoptr()
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* is only available when using GCC or clang, so the following example
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* will only work with those compilers:
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* |[
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* typedef struct
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* {
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* ...
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* GMutex mutex;
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* ...
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* } MyObject;
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*
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* static void
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* my_object_do_stuff (MyObject *self)
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* {
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* g_autoptr(GMutexLocker) locker = g_mutex_locker_new (&self->mutex);
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*
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* // Code with mutex locked here
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*
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* if (cond)
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* // No need to unlock
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* return;
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*
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* // Optionally early unlock
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* g_clear_pointer (&locker, g_mutex_locker_free);
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*
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* // Code with mutex unlocked here
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* }
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* ]|
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*
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* Returns: a #GMutexLocker
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* Since: 2.44
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*/
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GLIB_AVAILABLE_STATIC_INLINE_IN_2_44
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static inline GMutexLocker *
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g_mutex_locker_new (GMutex *mutex)
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{
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g_mutex_lock (mutex);
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return (GMutexLocker *) mutex;
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}
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/**
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* g_mutex_locker_free:
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* @locker: a GMutexLocker
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*
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* Unlock @locker's mutex. See g_mutex_locker_new() for details.
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*
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* No memory is freed, it is equivalent to a g_mutex_unlock() call.
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*
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* Since: 2.44
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*/
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GLIB_AVAILABLE_STATIC_INLINE_IN_2_44
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static inline void
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g_mutex_locker_free (GMutexLocker *locker)
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{
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g_mutex_unlock ((GMutex *) locker);
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}
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/**
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* GRecMutexLocker:
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*
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* Opaque type. See g_rec_mutex_locker_new() for details.
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* Since: 2.60
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*/
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typedef void GRecMutexLocker;
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/**
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* g_rec_mutex_locker_new:
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* @rec_mutex: a recursive mutex to lock
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*
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* Lock @rec_mutex and return a new #GRecMutexLocker. Unlock with
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* g_rec_mutex_locker_free(). Using g_rec_mutex_unlock() on @rec_mutex
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|
* while a #GRecMutexLocker exists can lead to undefined behaviour.
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|
*
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* No allocation is performed, it is equivalent to a g_rec_mutex_lock() call.
|
|
*
|
|
* This is intended to be used with g_autoptr(). Note that g_autoptr()
|
|
* is only available when using GCC or clang, so the following example
|
|
* will only work with those compilers:
|
|
* |[
|
|
* typedef struct
|
|
* {
|
|
* ...
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|
* GRecMutex rec_mutex;
|
|
* ...
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|
* } MyObject;
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|
*
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* static void
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* my_object_do_stuff (MyObject *self)
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* {
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* g_autoptr(GRecMutexLocker) locker = g_rec_mutex_locker_new (&self->rec_mutex);
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*
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* // Code with rec_mutex locked here
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*
|
|
* if (cond)
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* // No need to unlock
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* return;
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*
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* // Optionally early unlock
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* g_clear_pointer (&locker, g_rec_mutex_locker_free);
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*
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* // Code with rec_mutex unlocked here
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* }
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* ]|
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*
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* Returns: a #GRecMutexLocker
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|
* Since: 2.60
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|
*/
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|
G_GNUC_BEGIN_IGNORE_DEPRECATIONS
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GLIB_AVAILABLE_STATIC_INLINE_IN_2_60
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|
static inline GRecMutexLocker *
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g_rec_mutex_locker_new (GRecMutex *rec_mutex)
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|
{
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g_rec_mutex_lock (rec_mutex);
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return (GRecMutexLocker *) rec_mutex;
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}
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G_GNUC_END_IGNORE_DEPRECATIONS
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|
|
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/**
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|
* g_rec_mutex_locker_free:
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* @locker: a GRecMutexLocker
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|
*
|
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* Unlock @locker's recursive mutex. See g_rec_mutex_locker_new() for details.
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*
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|
* No memory is freed, it is equivalent to a g_rec_mutex_unlock() call.
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|
*
|
|
* Since: 2.60
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|
*/
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|
G_GNUC_BEGIN_IGNORE_DEPRECATIONS
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GLIB_AVAILABLE_STATIC_INLINE_IN_2_60
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|
static inline void
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g_rec_mutex_locker_free (GRecMutexLocker *locker)
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|
{
|
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g_rec_mutex_unlock ((GRecMutex *) locker);
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}
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G_GNUC_END_IGNORE_DEPRECATIONS
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|
|
/**
|
|
* GRWLockWriterLocker:
|
|
*
|
|
* Opaque type. See g_rw_lock_writer_locker_new() for details.
|
|
* Since: 2.62
|
|
*/
|
|
typedef void GRWLockWriterLocker;
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|
|
|
/**
|
|
* g_rw_lock_writer_locker_new:
|
|
* @rw_lock: a #GRWLock
|
|
*
|
|
* Obtain a write lock on @rw_lock and return a new #GRWLockWriterLocker.
|
|
* Unlock with g_rw_lock_writer_locker_free(). Using g_rw_lock_writer_unlock()
|
|
* on @rw_lock while a #GRWLockWriterLocker exists can lead to undefined
|
|
* behaviour.
|
|
*
|
|
* No allocation is performed, it is equivalent to a g_rw_lock_writer_lock() call.
|
|
*
|
|
* This is intended to be used with g_autoptr(). Note that g_autoptr()
|
|
* is only available when using GCC or clang, so the following example
|
|
* will only work with those compilers:
|
|
* |[
|
|
* typedef struct
|
|
* {
|
|
* ...
|
|
* GRWLock rw_lock;
|
|
* GPtrArray *array;
|
|
* ...
|
|
* } MyObject;
|
|
*
|
|
* static gchar *
|
|
* my_object_get_data (MyObject *self, guint index)
|
|
* {
|
|
* g_autoptr(GRWLockReaderLocker) locker = g_rw_lock_reader_locker_new (&self->rw_lock);
|
|
*
|
|
* // Code with a read lock obtained on rw_lock here
|
|
*
|
|
* if (self->array == NULL)
|
|
* // No need to unlock
|
|
* return NULL;
|
|
*
|
|
* if (index < self->array->len)
|
|
* // No need to unlock
|
|
* return g_ptr_array_index (self->array, index);
|
|
*
|
|
* // Optionally early unlock
|
|
* g_clear_pointer (&locker, g_rw_lock_reader_locker_free);
|
|
*
|
|
* // Code with rw_lock unlocked here
|
|
* return NULL;
|
|
* }
|
|
*
|
|
* static void
|
|
* my_object_set_data (MyObject *self, guint index, gpointer data)
|
|
* {
|
|
* g_autoptr(GRWLockWriterLocker) locker = g_rw_lock_writer_locker_new (&self->rw_lock);
|
|
*
|
|
* // Code with a write lock obtained on rw_lock here
|
|
*
|
|
* if (self->array == NULL)
|
|
* self->array = g_ptr_array_new ();
|
|
*
|
|
* if (cond)
|
|
* // No need to unlock
|
|
* return;
|
|
*
|
|
* if (index >= self->array->len)
|
|
* g_ptr_array_set_size (self->array, index+1);
|
|
* g_ptr_array_index (self->array, index) = data;
|
|
*
|
|
* // Optionally early unlock
|
|
* g_clear_pointer (&locker, g_rw_lock_writer_locker_free);
|
|
*
|
|
* // Code with rw_lock unlocked here
|
|
* }
|
|
* ]|
|
|
*
|
|
* Returns: a #GRWLockWriterLocker
|
|
* Since: 2.62
|
|
*/
|
|
G_GNUC_BEGIN_IGNORE_DEPRECATIONS
|
|
GLIB_AVAILABLE_STATIC_INLINE_IN_2_62
|
|
static inline GRWLockWriterLocker *
|
|
g_rw_lock_writer_locker_new (GRWLock *rw_lock)
|
|
{
|
|
g_rw_lock_writer_lock (rw_lock);
|
|
return (GRWLockWriterLocker *) rw_lock;
|
|
}
|
|
G_GNUC_END_IGNORE_DEPRECATIONS
|
|
|
|
/**
|
|
* g_rw_lock_writer_locker_free:
|
|
* @locker: a GRWLockWriterLocker
|
|
*
|
|
* Release a write lock on @locker's read-write lock. See
|
|
* g_rw_lock_writer_locker_new() for details.
|
|
*
|
|
* No memory is freed, it is equivalent to a g_rw_lock_writer_unlock() call.
|
|
*
|
|
* Since: 2.62
|
|
*/
|
|
G_GNUC_BEGIN_IGNORE_DEPRECATIONS
|
|
GLIB_AVAILABLE_STATIC_INLINE_IN_2_62
|
|
static inline void
|
|
g_rw_lock_writer_locker_free (GRWLockWriterLocker *locker)
|
|
{
|
|
g_rw_lock_writer_unlock ((GRWLock *) locker);
|
|
}
|
|
G_GNUC_END_IGNORE_DEPRECATIONS
|
|
|
|
/**
|
|
* GRWLockReaderLocker:
|
|
*
|
|
* Opaque type. See g_rw_lock_reader_locker_new() for details.
|
|
* Since: 2.62
|
|
*/
|
|
typedef void GRWLockReaderLocker;
|
|
|
|
/**
|
|
* g_rw_lock_reader_locker_new:
|
|
* @rw_lock: a #GRWLock
|
|
*
|
|
* Obtain a read lock on @rw_lock and return a new #GRWLockReaderLocker.
|
|
* Unlock with g_rw_lock_reader_locker_free(). Using g_rw_lock_reader_unlock()
|
|
* on @rw_lock while a #GRWLockReaderLocker exists can lead to undefined
|
|
* behaviour.
|
|
*
|
|
* No allocation is performed, it is equivalent to a g_rw_lock_reader_lock() call.
|
|
*
|
|
* This is intended to be used with g_autoptr(). For a code sample, see
|
|
* g_rw_lock_writer_locker_new().
|
|
*
|
|
* Returns: a #GRWLockReaderLocker
|
|
* Since: 2.62
|
|
*/
|
|
G_GNUC_BEGIN_IGNORE_DEPRECATIONS
|
|
GLIB_AVAILABLE_STATIC_INLINE_IN_2_62
|
|
static inline GRWLockReaderLocker *
|
|
g_rw_lock_reader_locker_new (GRWLock *rw_lock)
|
|
{
|
|
g_rw_lock_reader_lock (rw_lock);
|
|
return (GRWLockReaderLocker *) rw_lock;
|
|
}
|
|
G_GNUC_END_IGNORE_DEPRECATIONS
|
|
|
|
/**
|
|
* g_rw_lock_reader_locker_free:
|
|
* @locker: a GRWLockReaderLocker
|
|
*
|
|
* Release a read lock on @locker's read-write lock. See
|
|
* g_rw_lock_reader_locker_new() for details.
|
|
*
|
|
* No memory is freed, it is equivalent to a g_rw_lock_reader_unlock() call.
|
|
*
|
|
* Since: 2.62
|
|
*/
|
|
G_GNUC_BEGIN_IGNORE_DEPRECATIONS
|
|
GLIB_AVAILABLE_STATIC_INLINE_IN_2_62
|
|
static inline void
|
|
g_rw_lock_reader_locker_free (GRWLockReaderLocker *locker)
|
|
{
|
|
g_rw_lock_reader_unlock ((GRWLock *) locker);
|
|
}
|
|
G_GNUC_END_IGNORE_DEPRECATIONS
|
|
|
|
G_END_DECLS
|
|
|
|
#endif /* __G_THREAD_H__ */
|