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 #if defined(G_DISABLE_SINGLE_INCLUDES) && !defined (__GLIB_H_INSIDE__) && !defined (GLIB_COMPILATION)
  28 #error "Only <glib.h> can be included directly."
  29 #endif
  30
  31 #ifndef __G_ASYNCQUEUE_H__
  32 #define __G_ASYNCQUEUE_H__
  33
  34 #include <glib/gthread.h>
  35
  36 G_BEGIN_DECLS
  37
  38 typedef struct _GAsyncQueue GAsyncQueue;
  39
  40 /* Asyncronous Queues, can be used to communicate between threads */
  41
  42 /* Get a new GAsyncQueue with the ref_count 1 */
  43 GAsyncQueue*  g_async_queue_new                 (void);
  44
  45 GAsyncQueue*  g_async_queue_new_full            (GDestroyNotify item_free_func);
  46
  47 /* Lock and unlock a GAsyncQueue. All functions lock the queue for
  48  * themselves, but in certain cirumstances you want to hold the lock longer,
  49  * thus you lock the queue, call the *_unlocked functions and unlock it again.
  50  */
  51 void         g_async_queue_lock                 (GAsyncQueue      *queue);
  52 void         g_async_queue_unlock               (GAsyncQueue      *queue);
  53
  54 /* Ref and unref the GAsyncQueue. */
  55 GAsyncQueue* g_async_queue_ref                  (GAsyncQueue      *queue);
  56 void         g_async_queue_unref                (GAsyncQueue      *queue);
  57
  58 #ifndef G_DISABLE_DEPRECATED
  59 /* You don't have to hold the lock for calling *_ref and *_unref anymore. */
  60 void         g_async_queue_ref_unlocked         (GAsyncQueue      *queue);
  61 void         g_async_queue_unref_and_unlock     (GAsyncQueue      *queue);
  62 #endif /* !G_DISABLE_DEPRECATED */
  63
  64 /* Push data into the async queue. Must not be NULL. */
  65 void         g_async_queue_push                 (GAsyncQueue      *queue,
  66                                                  gpointer          data);
  67 void         g_async_queue_push_unlocked        (GAsyncQueue      *queue,
  68                                                  gpointer          data);
  69
  70 void         g_async_queue_push_sorted          (GAsyncQueue      *queue,
  71                                                  gpointer          data,
  72                                                  GCompareDataFunc  func,
  73                                                  gpointer          user_data);
  74 void         g_async_queue_push_sorted_unlocked (GAsyncQueue      *queue,
  75                                                  gpointer          data,
  76                                                  GCompareDataFunc  func,
  77                                                  gpointer          user_data);
  78
  79 /* Pop data from the async queue. When no data is there, the thread is blocked
  80  * until data arrives.
  81  */
  82 gpointer     g_async_queue_pop                  (GAsyncQueue      *queue);
  83 gpointer     g_async_queue_pop_unlocked         (GAsyncQueue      *queue);
  84
  85 /* Try to pop data. NULL is returned in case of empty queue. */
  86 gpointer     g_async_queue_try_pop              (GAsyncQueue      *queue);
  87 gpointer     g_async_queue_try_pop_unlocked     (GAsyncQueue      *queue);
  88
  89
  90
  91 /* Wait for data until at maximum until end_time is reached. NULL is returned
  92  * in case of empty queue.
  93  */
  94 gpointer     g_async_queue_timed_pop            (GAsyncQueue      *queue,
  95                                                  GTimeVal         *end_time);
  96 gpointer     g_async_queue_timed_pop_unlocked   (GAsyncQueue      *queue,
  97                                                  GTimeVal         *end_time);
  98
  99 /* Return the length of the queue. Negative values mean that threads
 100  * are waiting, positve values mean that there are entries in the
 101  * queue. Actually this function returns the length of the queue minus
 102  * the number of waiting threads, g_async_queue_length == 0 could also
 103  * mean 'n' entries in the queue and 'n' thread waiting. Such can
 104  * happen due to locking of the queue or due to scheduling.
 105  */
 106 gint         g_async_queue_length               (GAsyncQueue      *queue);
 107 gint         g_async_queue_length_unlocked      (GAsyncQueue      *queue);
 108 void         g_async_queue_sort                 (GAsyncQueue      *queue,
 109                                                  GCompareDataFunc  func,
 110                                                  gpointer          user_data);
 111 void         g_async_queue_sort_unlocked        (GAsyncQueue      *queue,
 112                                                  GCompareDataFunc  func,
 113                                                  gpointer          user_data);
 114
 115 /* Private API */
 116 GMutex*      _g_async_queue_get_mutex           (GAsyncQueue      *queue);
 117
 118 G_END_DECLS
 119
 120 #endif /* __G_ASYNCQUEUE_H__ */