glib/gthread.h

   1 /* GLIB - Library of useful routines for C programming
   2  * Copyright (C) 1995-1997  Peter Mattis, Spencer Kimball and Josh MacDonald
   3  *
   4  * SPDX-License-Identifier: LGPL-2.1-or-later
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful, but
  12  * WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 /*
  21  * Modified by the GLib Team and others 1997-2000.  See the AUTHORS
  22  * file for a list of people on the GLib Team.  See the ChangeLog
  23  * files for a list of changes.  These files are distributed with
  24  * GLib at ftp://ftp.gtk.org/pub/gtk/.
  25  */
  26
  27 #ifndef __G_THREAD_H__
  28 #define __G_THREAD_H__
  29
  30 #if !defined (__GLIB_H_INSIDE__) && !defined (GLIB_COMPILATION)
  31 #error "Only <glib.h> can be included directly."
  32 #endif
  33
  34 #include <glib/gatomic.h>
  35 #include <glib/gerror.h>
  36 #include <glib/gutils.h>
  37
  38 G_BEGIN_DECLS
  39
  40 #define G_THREAD_ERROR g_thread_error_quark ()
  41 GLIB_AVAILABLE_IN_ALL
  42 GQuark g_thread_error_quark (void);
  43
  44 typedef enum
  45 {
  46   G_THREAD_ERROR_AGAIN /* Resource temporarily unavailable */
  47 } GThreadError;
  48
  49 typedef gpointer (*GThreadFunc) (gpointer data);
  50
  51 typedef struct _GThread         GThread;
  52
  53 typedef union  _GMutex          GMutex;
  54 typedef struct _GRecMutex       GRecMutex;
  55 typedef struct _GRWLock         GRWLock;
  56 typedef struct _GCond           GCond;
  57 typedef struct _GPrivate        GPrivate;
  58 typedef struct _GOnce           GOnce;
  59
  60 union _GMutex
  61 {
  62   /*< private >*/
  63   gpointer p;
  64   guint i[2];
  65 };
  66
  67 struct _GRWLock
  68 {
  69   /*< private >*/
  70   gpointer p;
  71   guint i[2];
  72 };
  73
  74 struct _GCond
  75 {
  76   /*< private >*/
  77   gpointer p;
  78   guint i[2];
  79 };
  80
  81 struct _GRecMutex
  82 {
  83   /*< private >*/
  84   gpointer p;
  85   guint i[2];
  86 };
  87
  88 #define G_PRIVATE_INIT(notify) { NULL, (notify), { NULL, NULL } }
  89 struct _GPrivate
  90 {
  91   /*< private >*/
  92   gpointer       p;
  93   GDestroyNotify notify;
  94   gpointer future[2];
  95 };
  96
  97 typedef enum
  98 {
  99   G_ONCE_STATUS_NOTCALLED,
 100   G_ONCE_STATUS_PROGRESS,
 101   G_ONCE_STATUS_READY
 102 } GOnceStatus;
 103
 104 #define G_ONCE_INIT { G_ONCE_STATUS_NOTCALLED, NULL }
 105 struct _GOnce
 106 {
 107   volatile GOnceStatus status;
 108   volatile gpointer retval;
 109 };
 110
 111 #define G_LOCK_NAME(name)             g__ ## name ## _lock
 112 #define G_LOCK_DEFINE_STATIC(name)    static G_LOCK_DEFINE (name)
 113 #define G_LOCK_DEFINE(name)           GMutex G_LOCK_NAME (name)
 114 #define G_LOCK_EXTERN(name)           extern GMutex G_LOCK_NAME (name)
 115
 116 #ifdef G_DEBUG_LOCKS
 117 #  define G_LOCK(name)                G_STMT_START{             \
 118       g_log (G_LOG_DOMAIN, G_LOG_LEVEL_DEBUG,                   \
 119              "file %s: line %d (%s): locking: %s ",             \
 120              __FILE__,        __LINE__, G_STRFUNC,              \
 121              #name);                                            \
 122       g_mutex_lock (&G_LOCK_NAME (name));                       \
 123    }G_STMT_END
 124 #  define G_UNLOCK(name)              G_STMT_START{             \
 125       g_log (G_LOG_DOMAIN, G_LOG_LEVEL_DEBUG,                   \
 126              "file %s: line %d (%s): unlocking: %s ",           \
 127              __FILE__,        __LINE__, G_STRFUNC,              \
 128              #name);                                            \
 129      g_mutex_unlock (&G_LOCK_NAME (name));                      \
 130    }G_STMT_END
 131 #  define G_TRYLOCK(name)                                       \
 132       (g_log (G_LOG_DOMAIN, G_LOG_LEVEL_DEBUG,                  \
 133              "file %s: line %d (%s): try locking: %s ",         \
 134              __FILE__,        __LINE__, G_STRFUNC,              \
 135              #name), g_mutex_trylock (&G_LOCK_NAME (name)))
 136 #else  /* !G_DEBUG_LOCKS */
 137 #  define G_LOCK(name) g_mutex_lock       (&G_LOCK_NAME (name))
 138 #  define G_UNLOCK(name) g_mutex_unlock   (&G_LOCK_NAME (name))
 139 #  define G_TRYLOCK(name) g_mutex_trylock (&G_LOCK_NAME (name))
 140 #endif /* !G_DEBUG_LOCKS */
 141
 142 GLIB_AVAILABLE_IN_2_32
 143 GThread *       g_thread_ref                    (GThread        *thread);
 144 GLIB_AVAILABLE_IN_2_32
 145 void            g_thread_unref                  (GThread        *thread);
 146 GLIB_AVAILABLE_IN_2_32
 147 GThread *       g_thread_new                    (const gchar    *name,
 148                                                  GThreadFunc     func,
 149                                                  gpointer        data);
 150 GLIB_AVAILABLE_IN_2_32
 151 GThread *       g_thread_try_new                (const gchar    *name,
 152                                                  GThreadFunc     func,
 153                                                  gpointer        data,
 154                                                  GError        **error);
 155 GLIB_AVAILABLE_IN_ALL
 156 GThread *       g_thread_self                   (void);
 157 G_NORETURN GLIB_AVAILABLE_IN_ALL
 158 void            g_thread_exit                   (gpointer        retval);
 159 GLIB_AVAILABLE_IN_ALL
 160 gpointer        g_thread_join                   (GThread        *thread);
 161 GLIB_AVAILABLE_IN_ALL
 162 void            g_thread_yield                  (void);
 163
 164
 165 GLIB_AVAILABLE_IN_2_32
 166 void            g_mutex_init                    (GMutex         *mutex);
 167 GLIB_AVAILABLE_IN_2_32
 168 void            g_mutex_clear                   (GMutex         *mutex);
 169 GLIB_AVAILABLE_IN_ALL
 170 void            g_mutex_lock                    (GMutex         *mutex);
 171 GLIB_AVAILABLE_IN_ALL
 172 gboolean        g_mutex_trylock                 (GMutex         *mutex);
 173 GLIB_AVAILABLE_IN_ALL
 174 void            g_mutex_unlock                  (GMutex         *mutex);
 175
 176 GLIB_AVAILABLE_IN_2_32
 177 void            g_rw_lock_init                  (GRWLock        *rw_lock);
 178 GLIB_AVAILABLE_IN_2_32
 179 void            g_rw_lock_clear                 (GRWLock        *rw_lock);
 180 GLIB_AVAILABLE_IN_2_32
 181 void            g_rw_lock_writer_lock           (GRWLock        *rw_lock);
 182 GLIB_AVAILABLE_IN_2_32
 183 gboolean        g_rw_lock_writer_trylock        (GRWLock        *rw_lock);
 184 GLIB_AVAILABLE_IN_2_32
 185 void            g_rw_lock_writer_unlock         (GRWLock        *rw_lock);
 186 GLIB_AVAILABLE_IN_2_32
 187 void            g_rw_lock_reader_lock           (GRWLock        *rw_lock);
 188 GLIB_AVAILABLE_IN_2_32
 189 gboolean        g_rw_lock_reader_trylock        (GRWLock        *rw_lock);
 190 GLIB_AVAILABLE_IN_2_32
 191 void            g_rw_lock_reader_unlock         (GRWLock        *rw_lock);
 192
 193 GLIB_AVAILABLE_IN_2_32
 194 void            g_rec_mutex_init                (GRecMutex      *rec_mutex);
 195 GLIB_AVAILABLE_IN_2_32
 196 void            g_rec_mutex_clear               (GRecMutex      *rec_mutex);
 197 GLIB_AVAILABLE_IN_2_32
 198 void            g_rec_mutex_lock                (GRecMutex      *rec_mutex);
 199 GLIB_AVAILABLE_IN_2_32
 200 gboolean        g_rec_mutex_trylock             (GRecMutex      *rec_mutex);
 201 GLIB_AVAILABLE_IN_2_32
 202 void            g_rec_mutex_unlock              (GRecMutex      *rec_mutex);
 203
 204 GLIB_AVAILABLE_IN_2_32
 205 void            g_cond_init                     (GCond          *cond);
 206 GLIB_AVAILABLE_IN_2_32
 207 void            g_cond_clear                    (GCond          *cond);
 208 GLIB_AVAILABLE_IN_ALL
 209 void            g_cond_wait                     (GCond          *cond,
 210                                                  GMutex         *mutex);
 211 GLIB_AVAILABLE_IN_ALL
 212 void            g_cond_signal                   (GCond          *cond);
 213 GLIB_AVAILABLE_IN_ALL
 214 void            g_cond_broadcast                (GCond          *cond);
 215 GLIB_AVAILABLE_IN_2_32
 216 gboolean        g_cond_wait_until               (GCond          *cond,
 217                                                  GMutex         *mutex,
 218                                                  gint64          end_time);
 219
 220 GLIB_AVAILABLE_IN_ALL
 221 gpointer        g_private_get                   (GPrivate       *key);
 222 GLIB_AVAILABLE_IN_ALL
 223 void            g_private_set                   (GPrivate       *key,
 224                                                  gpointer        value);
 225 GLIB_AVAILABLE_IN_2_32
 226 void            g_private_replace               (GPrivate       *key,
 227                                                  gpointer        value);
 228
 229 GLIB_AVAILABLE_IN_ALL
 230 gpointer        g_once_impl                     (GOnce          *once,
 231                                                  GThreadFunc     func,
 232                                                  gpointer        arg);
 233 GLIB_AVAILABLE_IN_ALL
 234 gboolean        g_once_init_enter               (volatile void  *location);
 235 GLIB_AVAILABLE_IN_ALL
 236 void            g_once_init_leave               (volatile void  *location,
 237                                                  gsize           result);
 238
 239 /* Use C11-style atomic extensions to check the fast path for status=ready. If
 240  * they are not available, fall back to using a mutex and condition variable in
 241  * g_once_impl().
 242  *
 243  * On the C11-style codepath, only the load of once->status needs to be atomic,
 244  * as the writes to it and once->retval in g_once_impl() are related by a
 245  * happens-before relation. Release-acquire semantics are defined such that any
 246  * atomic/non-atomic write which happens-before a store/release is guaranteed to
 247  * be seen by the load/acquire of the same atomic variable. */
 248 #if defined(G_ATOMIC_LOCK_FREE) && defined(__GCC_HAVE_SYNC_COMPARE_AND_SWAP_4) && defined(__ATOMIC_SEQ_CST)
 249 # define g_once(once, func, arg) \
 250   ((__atomic_load_n (&(once)->status, __ATOMIC_ACQUIRE) == G_ONCE_STATUS_READY) ? \
 251    (once)->retval : \
 252    g_once_impl ((once), (func), (arg)))
 253 #else
 254 # define g_once(once, func, arg) g_once_impl ((once), (func), (arg))
 255 #endif
 256
 257 #ifdef __GNUC__
 258 # define g_once_init_enter(location) \
 259   (G_GNUC_EXTENSION ({                                               \
 260     G_STATIC_ASSERT (sizeof *(location) == sizeof (gpointer));       \
 261     (void) (0 ? (gpointer) *(location) : NULL);                      \
 262     (!g_atomic_pointer_get (location) &&                             \
 263      g_once_init_enter (location));                                  \
 264   }))
 265 # define g_once_init_leave(location, result) \
 266   (G_GNUC_EXTENSION ({                                               \
 267     G_STATIC_ASSERT (sizeof *(location) == sizeof (gpointer));       \
 268     0 ? (void) (*(location) = (result)) : (void) 0;                  \
 269     g_once_init_leave ((location), (gsize) (result));                \
 270   }))
 271 #else
 272 # define g_once_init_enter(location) \
 273   (g_once_init_enter((location)))
 274 # define g_once_init_leave(location, result) \
 275   (g_once_init_leave((location), (gsize) (result)))
 276 #endif
 277
 278 GLIB_AVAILABLE_IN_2_36
 279 guint          g_get_num_processors (void);
 280
 281 /**
 282  * GMutexLocker:
 283  *
 284  * Opaque type. See g_mutex_locker_new() for details.
 285  * Since: 2.44
 286  */
 287 typedef void GMutexLocker;
 288
 289 /**
 290  * g_mutex_locker_new:
 291  * @mutex: a mutex to lock
 292  *
 293  * Lock @mutex and return a new #GMutexLocker. Unlock with
 294  * g_mutex_locker_free(). Using g_mutex_unlock() on @mutex
 295  * while a #GMutexLocker exists can lead to undefined behaviour.
 296  *
 297  * No allocation is performed, it is equivalent to a g_mutex_lock() call.
 298  *
 299  * This is intended to be used with g_autoptr().  Note that g_autoptr()
 300  * is only available when using GCC or clang, so the following example
 301  * will only work with those compilers:
 302  * |[
 303  * typedef struct
 304  * {
 305  *   ...
 306  *   GMutex mutex;
 307  *   ...
 308  * } MyObject;
 309  *
 310  * static void
 311  * my_object_do_stuff (MyObject *self)
 312  * {
 313  *   g_autoptr(GMutexLocker) locker = g_mutex_locker_new (&self->mutex);
 314  *
 315  *   // Code with mutex locked here
 316  *
 317  *   if (cond)
 318  *     // No need to unlock
 319  *     return;
 320  *
 321  *   // Optionally early unlock
 322  *   g_clear_pointer (&locker, g_mutex_locker_free);
 323  *
 324  *   // Code with mutex unlocked here
 325  * }
 326  * ]|
 327  *
 328  * Returns: a #GMutexLocker
 329  * Since: 2.44
 330  */
 331 GLIB_AVAILABLE_STATIC_INLINE_IN_2_44
 332 static inline GMutexLocker *
 333 g_mutex_locker_new (GMutex *mutex)
 334 {
 335   g_mutex_lock (mutex);
 336   return (GMutexLocker *) mutex;
 337 }
 338
 339 /**
 340  * g_mutex_locker_free:
 341  * @locker: a GMutexLocker
 342  *
 343  * Unlock @locker's mutex. See g_mutex_locker_new() for details.
 344  *
 345  * No memory is freed, it is equivalent to a g_mutex_unlock() call.
 346  *
 347  * Since: 2.44
 348  */
 349 GLIB_AVAILABLE_STATIC_INLINE_IN_2_44
 350 static inline void
 351 g_mutex_locker_free (GMutexLocker *locker)
 352 {
 353   g_mutex_unlock ((GMutex *) locker);
 354 }
 355
 356 /**
 357  * GRecMutexLocker:
 358  *
 359  * Opaque type. See g_rec_mutex_locker_new() for details.
 360  * Since: 2.60
 361  */
 362 typedef void GRecMutexLocker;
 363
 364 /**
 365  * g_rec_mutex_locker_new:
 366  * @rec_mutex: a recursive mutex to lock
 367  *
 368  * Lock @rec_mutex and return a new #GRecMutexLocker. Unlock with
 369  * g_rec_mutex_locker_free(). Using g_rec_mutex_unlock() on @rec_mutex
 370  * while a #GRecMutexLocker exists can lead to undefined behaviour.
 371  *
 372  * No allocation is performed, it is equivalent to a g_rec_mutex_lock() call.
 373  *
 374  * This is intended to be used with g_autoptr().  Note that g_autoptr()
 375  * is only available when using GCC or clang, so the following example
 376  * will only work with those compilers:
 377  * |[
 378  * typedef struct
 379  * {
 380  *   ...
 381  *   GRecMutex rec_mutex;
 382  *   ...
 383  * } MyObject;
 384  *
 385  * static void
 386  * my_object_do_stuff (MyObject *self)
 387  * {
 388  *   g_autoptr(GRecMutexLocker) locker = g_rec_mutex_locker_new (&self->rec_mutex);
 389  *
 390  *   // Code with rec_mutex locked here
 391  *
 392  *   if (cond)
 393  *     // No need to unlock
 394  *     return;
 395  *
 396  *   // Optionally early unlock
 397  *   g_clear_pointer (&locker, g_rec_mutex_locker_free);
 398  *
 399  *   // Code with rec_mutex unlocked here
 400  * }
 401  * ]|
 402  *
 403  * Returns: a #GRecMutexLocker
 404  * Since: 2.60
 405  */
 406 G_GNUC_BEGIN_IGNORE_DEPRECATIONS
 407 GLIB_AVAILABLE_STATIC_INLINE_IN_2_60
 408 static inline GRecMutexLocker *
 409 g_rec_mutex_locker_new (GRecMutex *rec_mutex)
 410 {
 411   g_rec_mutex_lock (rec_mutex);
 412   return (GRecMutexLocker *) rec_mutex;
 413 }
 414 G_GNUC_END_IGNORE_DEPRECATIONS
 415
 416 /**
 417  * g_rec_mutex_locker_free:
 418  * @locker: a GRecMutexLocker
 419  *
 420  * Unlock @locker's recursive mutex. See g_rec_mutex_locker_new() for details.
 421  *
 422  * No memory is freed, it is equivalent to a g_rec_mutex_unlock() call.
 423  *
 424  * Since: 2.60
 425  */
 426 G_GNUC_BEGIN_IGNORE_DEPRECATIONS
 427 GLIB_AVAILABLE_STATIC_INLINE_IN_2_60
 428 static inline void
 429 g_rec_mutex_locker_free (GRecMutexLocker *locker)
 430 {
 431   g_rec_mutex_unlock ((GRecMutex *) locker);
 432 }
 433 G_GNUC_END_IGNORE_DEPRECATIONS
 434
 435 /**
 436  * GRWLockWriterLocker:
 437  *
 438  * Opaque type. See g_rw_lock_writer_locker_new() for details.
 439  * Since: 2.62
 440  */
 441 typedef void GRWLockWriterLocker;
 442
 443 /**
 444  * g_rw_lock_writer_locker_new:
 445  * @rw_lock: a #GRWLock
 446  *
 447  * Obtain a write lock on @rw_lock and return a new #GRWLockWriterLocker.
 448  * Unlock with g_rw_lock_writer_locker_free(). Using g_rw_lock_writer_unlock()
 449  * on @rw_lock while a #GRWLockWriterLocker exists can lead to undefined
 450  * behaviour.
 451  *
 452  * No allocation is performed, it is equivalent to a g_rw_lock_writer_lock() call.
 453  *
 454  * This is intended to be used with g_autoptr().  Note that g_autoptr()
 455  * is only available when using GCC or clang, so the following example
 456  * will only work with those compilers:
 457  * |[
 458  * typedef struct
 459  * {
 460  *   ...
 461  *   GRWLock rw_lock;
 462  *   GPtrArray *array;
 463  *   ...
 464  * } MyObject;
 465  *
 466  * static gchar *
 467  * my_object_get_data (MyObject *self, guint index)
 468  * {
 469  *   g_autoptr(GRWLockReaderLocker) locker = g_rw_lock_reader_locker_new (&self->rw_lock);
 470  *
 471  *   // Code with a read lock obtained on rw_lock here
 472  *
 473  *   if (self->array == NULL)
 474  *     // No need to unlock
 475  *     return NULL;
 476  *
 477  *   if (index < self->array->len)
 478  *     // No need to unlock
 479  *     return g_ptr_array_index (self->array, index);
 480  *
 481  *   // Optionally early unlock
 482  *   g_clear_pointer (&locker, g_rw_lock_reader_locker_free);
 483  *
 484  *   // Code with rw_lock unlocked here
 485  *   return NULL;
 486  * }
 487  *
 488  * static void
 489  * my_object_set_data (MyObject *self, guint index, gpointer data)
 490  * {
 491  *   g_autoptr(GRWLockWriterLocker) locker = g_rw_lock_writer_locker_new (&self->rw_lock);
 492  *
 493  *   // Code with a write lock obtained on rw_lock here
 494  *
 495  *   if (self->array == NULL)
 496  *     self->array = g_ptr_array_new ();
 497  *
 498  *   if (cond)
 499  *     // No need to unlock
 500  *     return;
 501  *
 502  *   if (index >= self->array->len)
 503  *     g_ptr_array_set_size (self->array, index+1);
 504  *   g_ptr_array_index (self->array, index) = data;
 505  *
 506  *   // Optionally early unlock
 507  *   g_clear_pointer (&locker, g_rw_lock_writer_locker_free);
 508  *
 509  *   // Code with rw_lock unlocked here
 510  * }
 511  * ]|
 512  *
 513  * Returns: a #GRWLockWriterLocker
 514  * Since: 2.62
 515  */
 516 G_GNUC_BEGIN_IGNORE_DEPRECATIONS
 517 GLIB_AVAILABLE_STATIC_INLINE_IN_2_62
 518 static inline GRWLockWriterLocker *
 519 g_rw_lock_writer_locker_new (GRWLock *rw_lock)
 520 {
 521   g_rw_lock_writer_lock (rw_lock);
 522   return (GRWLockWriterLocker *) rw_lock;
 523 }
 524 G_GNUC_END_IGNORE_DEPRECATIONS
 525
 526 /**
 527  * g_rw_lock_writer_locker_free:
 528  * @locker: a GRWLockWriterLocker
 529  *
 530  * Release a write lock on @locker's read-write lock. See
 531  * g_rw_lock_writer_locker_new() for details.
 532  *
 533  * No memory is freed, it is equivalent to a g_rw_lock_writer_unlock() call.
 534  *
 535  * Since: 2.62
 536  */
 537 G_GNUC_BEGIN_IGNORE_DEPRECATIONS
 538 GLIB_AVAILABLE_STATIC_INLINE_IN_2_62
 539 static inline void
 540 g_rw_lock_writer_locker_free (GRWLockWriterLocker *locker)
 541 {
 542   g_rw_lock_writer_unlock ((GRWLock *) locker);
 543 }
 544 G_GNUC_END_IGNORE_DEPRECATIONS
 545
 546 /**
 547  * GRWLockReaderLocker:
 548  *
 549  * Opaque type. See g_rw_lock_reader_locker_new() for details.
 550  * Since: 2.62
 551  */
 552 typedef void GRWLockReaderLocker;
 553
 554 /**
 555  * g_rw_lock_reader_locker_new:
 556  * @rw_lock: a #GRWLock
 557  *
 558  * Obtain a read lock on @rw_lock and return a new #GRWLockReaderLocker.
 559  * Unlock with g_rw_lock_reader_locker_free(). Using g_rw_lock_reader_unlock()
 560  * on @rw_lock while a #GRWLockReaderLocker exists can lead to undefined
 561  * behaviour.
 562  *
 563  * No allocation is performed, it is equivalent to a g_rw_lock_reader_lock() call.
 564  *
 565  * This is intended to be used with g_autoptr(). For a code sample, see
 566  * g_rw_lock_writer_locker_new().
 567  *
 568  * Returns: a #GRWLockReaderLocker
 569  * Since: 2.62
 570  */
 571 G_GNUC_BEGIN_IGNORE_DEPRECATIONS
 572 GLIB_AVAILABLE_STATIC_INLINE_IN_2_62
 573 static inline GRWLockReaderLocker *
 574 g_rw_lock_reader_locker_new (GRWLock *rw_lock)
 575 {
 576   g_rw_lock_reader_lock (rw_lock);
 577   return (GRWLockReaderLocker *) rw_lock;
 578 }
 579 G_GNUC_END_IGNORE_DEPRECATIONS
 580
 581 /**
 582  * g_rw_lock_reader_locker_free:
 583  * @locker: a GRWLockReaderLocker
 584  *
 585  * Release a read lock on @locker's read-write lock. See
 586  * g_rw_lock_reader_locker_new() for details.
 587  *
 588  * No memory is freed, it is equivalent to a g_rw_lock_reader_unlock() call.
 589  *
 590  * Since: 2.62
 591  */
 592 G_GNUC_BEGIN_IGNORE_DEPRECATIONS
 593 GLIB_AVAILABLE_STATIC_INLINE_IN_2_62
 594 static inline void
 595 g_rw_lock_reader_locker_free (GRWLockReaderLocker *locker)
 596 {
 597   g_rw_lock_reader_unlock ((GRWLock *) locker);
 598 }
 599 G_GNUC_END_IGNORE_DEPRECATIONS
 600
 601 G_END_DECLS
 602
 603 #endif /* __G_THREAD_H__ */