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/* GLIB - Library of useful routines for C programming
* Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
/*
* Modified by the GLib Team and others 1997-2000. See the AUTHORS
* file for a list of people on the GLib Team. See the ChangeLog
* files for a list of changes. These files are distributed with
* GLib at ftp://ftp.gtk.org/pub/gtk/.
*/
#ifndef __G_ASYNCQUEUE_H__
#define __G_ASYNCQUEUE_H__
#include <gthread.h>
G_BEGIN_DECLS
typedef struct _GAsyncQueue GAsyncQueue;
/* Asyncronous Queues, can be used to communicate between threads
*/
/* Get a new GAsyncQueue with the ref_count 1 */
GAsyncQueue* g_async_queue_new (void);
/* Lock and unlock an GAsyncQueue, all functions lock the queue for
* themselves, but in certain cirumstances you want to hold the lock longer,
* thus you lock the queue, call the *_unlocked functions and unlock it again
*/
void g_async_queue_lock (GAsyncQueue *queue);
void g_async_queue_unlock (GAsyncQueue *queue);
/* Ref and unref the GAsyncQueue. g_async_queue_unref_unlocked makes
* no sense, as after the unreffing the Queue might be gone and can't
* be unlocked. So you have a function to call, if you don't hold the
* lock (g_async_queue_unref) and one to call, when you already hold
* the lock (g_async_queue_unref_and_unlock). After that however, you
* don't hold the lock anymore and the Queue might in fact be
* destroyed, if you unrefed to zero */
void g_async_queue_ref (GAsyncQueue *queue);
void g_async_queue_ref_unlocked (GAsyncQueue *queue);
void g_async_queue_unref (GAsyncQueue *queue);
void g_async_queue_unref_and_unlock (GAsyncQueue *queue);
/* Push data into the async queue. Must not be NULL */
void g_async_queue_push (GAsyncQueue *queue,
gpointer data);
void g_async_queue_push_unlocked (GAsyncQueue *queue,
gpointer data);
/* Pop data from the async queue, when no data is there, the thread is blocked
* until data arrives */
gpointer g_async_queue_pop (GAsyncQueue *queue);
gpointer g_async_queue_pop_unlocked (GAsyncQueue *queue);
/* Try to pop data, NULL is returned in case of empty queue */
gpointer g_async_queue_try_pop (GAsyncQueue *queue);
gpointer g_async_queue_try_pop_unlocked (GAsyncQueue *queue);
/* Wait for data until at maximum until end_time is reached, NULL is returned
* in case of empty queue*/
gpointer g_async_queue_timed_pop (GAsyncQueue *queue,
GTimeVal *end_time);
gpointer g_async_queue_timed_pop_unlocked (GAsyncQueue *queue,
GTimeVal *end_time);
/* Return the length of the queue, negative values mean, that threads
* are waiting, positve values mean, that there are entries in the
* queue. Actually this function returns the length of the queue minus
* the number of waiting threads, g_async_queue_length == 0 could also
* mean 'n' entries in the queue and 'n' thread waiting, such can
* happen due to locking of the queue or due to scheduling. */
gint g_async_queue_length (GAsyncQueue *queue);
gint g_async_queue_length_unlocked (GAsyncQueue *queue);
G_END_DECLS
#endif /* __G_ASYNCQUEUE_H__ */
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