glib/gthreadpool.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_THREADPOOL_H__
  28 #define __G_THREADPOOL_H__
  29
  30 #include <glib/gthread.h>
  31
  32 G_BEGIN_DECLS
  33
  34 typedef struct _GThreadPool     GThreadPool;
  35
  36 /* Thread Pools
  37  */
  38
  39 /* The real GThreadPool is bigger, so you may only create a thread
  40  * pool with the constructor function */
  41 struct _GThreadPool
  42 {
  43   GFunc func;
  44   gpointer user_data;
  45   gboolean exclusive;
  46 };
  47
  48 /* Get a thread pool with the function func, at most max_threads may
  49  * run at a time (max_threads == -1 means no limit), exclusive == TRUE
  50  * means, that the threads shouldn't be shared and that they will be
  51  * prestarted (otherwise they are started as needed) user_data is the
  52  * 2nd argument to the func */
  53 GThreadPool*    g_thread_pool_new             (GFunc            func,
  54                                                gpointer         user_data,
  55                                                gint             max_threads,
  56                                                gboolean         exclusive,
  57                                                GError         **error);
  58
  59 /* Push new data into the thread pool. This task is assigned to a thread later
  60  * (when the maximal number of threads is reached for that pool) or now
  61  * (otherwise). If necessary a new thread will be started. The function
  62  * returns immediatly */
  63 void            g_thread_pool_push            (GThreadPool     *pool,
  64                                                gpointer         data,
  65                                                GError         **error);
  66
  67 /* Set the number of threads, which can run concurrently for that pool, -1
  68  * means no limit. 0 means has the effect, that the pool won't process
  69  * requests until the limit is set higher again */
  70 void            g_thread_pool_set_max_threads (GThreadPool     *pool,
  71                                                gint             max_threads,
  72                                                GError         **error);
  73 gint            g_thread_pool_get_max_threads (GThreadPool     *pool);
  74
  75 /* Get the number of threads assigned to that pool. This number doesn't
  76  * necessarily represent the number of working threads in that pool */
  77 guint           g_thread_pool_get_num_threads (GThreadPool     *pool);
  78
  79 /* Get the number of unprocessed items in the pool */
  80 guint           g_thread_pool_unprocessed     (GThreadPool     *pool);
  81
  82 /* Free the pool, immediate means, that all unprocessed items in the queue
  83  * wont be processed, wait means, that the function doesn't return immediatly,
  84  * but after all threads in the pool are ready processing items. immediate
  85  * does however not mean, that threads are killed. */
  86 void            g_thread_pool_free            (GThreadPool     *pool,
  87                                                gboolean         immediate,
  88                                                gboolean         wait);
  89
  90 /* Set the maximal number of unused threads before threads will be stopped by
  91  * GLib, -1 means no limit */
  92 void            g_thread_pool_set_max_unused_threads (gint      max_threads);
  93 gint            g_thread_pool_get_max_unused_threads (void);
  94 guint           g_thread_pool_get_num_unused_threads (void);
  95
  96 /* Stop all currently unused threads, but leave the limit untouched */
  97 void            g_thread_pool_stop_unused_threads    (void);
  98
  99 G_END_DECLS
 100
 101 #endif /* __G_THREADPOOL_H__ */
 102