glib/gasyncqueue.h

   1 /* GLIB - Library of useful routines for C programming
   2  * Copyright (C) 1995-1997  Peter Mattis, Spencer Kimball and Josh MacDonald
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with this library; if not, write to the
  16  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17  * Boston, MA 02111-1307, USA.
  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_ASYNCQUEUE_H__
  28 #define __G_ASYNCQUEUE_H__
  29
  30 #include <glib/gthread.h>
  31
  32 G_BEGIN_DECLS
  33
  34 typedef struct _GAsyncQueue GAsyncQueue;
  35
  36 /* Asyncronous Queues, can be used to communicate between threads */
  37
  38 /* Get a new GAsyncQueue with the ref_count 1 */
  39 GAsyncQueue*  g_async_queue_new                 (void);
  40
  41 /* Lock and unlock a GAsyncQueue. All functions lock the queue for
  42  * themselves, but in certain cirumstances you want to hold the lock longer,
  43  * thus you lock the queue, call the *_unlocked functions and unlock it again.
  44  */
  45 void         g_async_queue_lock                 (GAsyncQueue      *queue);
  46 void         g_async_queue_unlock               (GAsyncQueue      *queue);
  47
  48 /* Ref and unref the GAsyncQueue. */
  49 GAsyncQueue* g_async_queue_ref                  (GAsyncQueue      *queue);
  50 void         g_async_queue_unref                (GAsyncQueue      *queue);
  51
  52 #ifndef G_DISABLE_DEPRECATED
  53 /* You don't have to hold the lock for calling *_ref and *_unref anymore. */
  54 void         g_async_queue_ref_unlocked         (GAsyncQueue      *queue);
  55 void         g_async_queue_unref_and_unlock     (GAsyncQueue      *queue);
  56 #endif /* !G_DISABLE_DEPRECATED */
  57
  58 /* Push data into the async queue. Must not be NULL. */
  59 void         g_async_queue_push                 (GAsyncQueue      *queue,
  60                                                  gpointer          data);
  61 void         g_async_queue_push_unlocked        (GAsyncQueue      *queue,
  62                                                  gpointer          data);
  63
  64 void         g_async_queue_push_sorted          (GAsyncQueue      *queue,
  65                                                  gpointer          data,
  66                                                  GCompareDataFunc  func,
  67                                                  gpointer          user_data);
  68 void         g_async_queue_push_sorted_unlocked (GAsyncQueue      *queue,
  69                                                  gpointer          data,
  70                                                  GCompareDataFunc  func,
  71                                                  gpointer          user_data);
  72
  73 /* Pop data from the async queue. When no data is there, the thread is blocked
  74  * until data arrives.
  75  */
  76 gpointer     g_async_queue_pop                  (GAsyncQueue      *queue);
  77 gpointer     g_async_queue_pop_unlocked         (GAsyncQueue      *queue);
  78
  79 /* Try to pop data. NULL is returned in case of empty queue. */
  80 gpointer     g_async_queue_try_pop              (GAsyncQueue      *queue);
  81 gpointer     g_async_queue_try_pop_unlocked     (GAsyncQueue      *queue);
  82
  83
  84
  85 /* Wait for data until at maximum until end_time is reached. NULL is returned
  86  * in case of empty queue.
  87  */
  88 gpointer     g_async_queue_timed_pop            (GAsyncQueue      *queue,
  89                                                  GTimeVal         *end_time);
  90 gpointer     g_async_queue_timed_pop_unlocked   (GAsyncQueue      *queue,
  91                                                  GTimeVal         *end_time);
  92
  93 /* Return the length of the queue. Negative values mean that threads
  94  * are waiting, positve values mean that there are entries in the
  95  * queue. Actually this function returns the length of the queue minus
  96  * the number of waiting threads, g_async_queue_length == 0 could also
  97  * mean 'n' entries in the queue and 'n' thread waiting. Such can
  98  * happen due to locking of the queue or due to scheduling.
  99  */
 100 gint         g_async_queue_length               (GAsyncQueue      *queue);
 101 gint         g_async_queue_length_unlocked      (GAsyncQueue      *queue);
 102 void         g_async_queue_sort                 (GAsyncQueue      *queue,
 103                                                  GCompareDataFunc  func,
 104                                                  gpointer          user_data);
 105 void         g_async_queue_sort_unlocked        (GAsyncQueue      *queue,
 106                                                  GCompareDataFunc  func,
 107                                                  gpointer          user_data);
 108
 109 /* Private API */
 110 GMutex*      _g_async_queue_get_mutex           (GAsyncQueue      *queue);
 111
 112 G_END_DECLS
 113
 114 #endif /* __G_ASYNCQUEUE_H__ */
 115