| /* GLIB - Library of useful routines for C programming |
| * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald |
| * |
| * GAsyncQueue: asyncronous queue implementation, based on Gqueue. |
| * Copyright (C) 2000 Sebastian Wilhelmi; University of Karlsruhe |
| * |
| * 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. |
| */ |
| |
| /* |
| * MT safe |
| */ |
| |
| #include "glib.h" |
| |
| struct _GAsyncQueue |
| { |
| GMutex *mutex; |
| GCond *cond; |
| GQueue *queue; |
| guint waiting_threads; |
| guint ref_count; |
| }; |
| |
| GAsyncQueue* |
| g_async_queue_new () |
| { |
| GAsyncQueue* retval = g_new (GAsyncQueue, 1); |
| retval->mutex = g_mutex_new (); |
| retval->cond = g_cond_new (); |
| retval->queue = g_queue_new (); |
| retval->waiting_threads = 0; |
| retval->ref_count = 1; |
| return retval; |
| } |
| |
| void |
| g_async_queue_ref (GAsyncQueue *queue) |
| { |
| g_return_if_fail (queue); |
| g_return_if_fail (queue->ref_count > 0); |
| |
| g_mutex_lock (queue->mutex); |
| queue->ref_count++; |
| g_mutex_unlock (queue->mutex); |
| } |
| |
| void |
| g_async_queue_ref_unlocked (GAsyncQueue *queue) |
| { |
| g_return_if_fail (queue); |
| g_return_if_fail (queue->ref_count > 0); |
| |
| queue->ref_count++; |
| } |
| |
| void |
| g_async_queue_unref_and_unlock (GAsyncQueue *queue) |
| { |
| gboolean stop; |
| |
| g_return_if_fail (queue); |
| g_return_if_fail (queue->ref_count > 0); |
| |
| queue->ref_count--; |
| stop = (queue->ref_count == 0); |
| g_mutex_unlock (queue->mutex); |
| |
| if (stop) |
| { |
| g_return_if_fail (queue->waiting_threads == 0); |
| g_mutex_free (queue->mutex); |
| g_cond_free (queue->cond); |
| g_queue_free (queue->queue); |
| g_free (queue); |
| } |
| } |
| |
| void |
| g_async_queue_unref (GAsyncQueue *queue) |
| { |
| g_return_if_fail (queue); |
| g_return_if_fail (queue->ref_count > 0); |
| |
| g_mutex_lock (queue->mutex); |
| g_async_queue_unref_and_unlock (queue); |
| } |
| |
| void |
| g_async_queue_lock (GAsyncQueue *queue) |
| { |
| g_return_if_fail (queue); |
| g_return_if_fail (queue->ref_count > 0); |
| |
| g_mutex_lock (queue->mutex); |
| } |
| |
| void |
| g_async_queue_unlock (GAsyncQueue *queue) |
| { |
| g_return_if_fail (queue); |
| g_return_if_fail (queue->ref_count > 0); |
| |
| g_mutex_unlock (queue->mutex); |
| } |
| |
| void |
| g_async_queue_push (GAsyncQueue* queue, gpointer data) |
| { |
| g_return_if_fail (queue); |
| g_return_if_fail (queue->ref_count > 0); |
| g_return_if_fail (data); |
| |
| g_mutex_lock (queue->mutex); |
| g_async_queue_push_unlocked (queue, data); |
| g_mutex_unlock (queue->mutex); |
| } |
| |
| void |
| g_async_queue_push_unlocked (GAsyncQueue* queue, gpointer data) |
| { |
| g_return_if_fail (queue); |
| g_return_if_fail (queue->ref_count > 0); |
| g_return_if_fail (data); |
| |
| g_queue_push_head (queue->queue, data); |
| g_cond_signal (queue->cond); |
| } |
| |
| static gpointer |
| g_async_queue_pop_intern_unlocked (GAsyncQueue* queue, gboolean try, |
| GTimeVal *end_time) |
| { |
| gpointer retval; |
| |
| if (!g_queue_peek_tail (queue->queue)) |
| { |
| if (try) |
| return NULL; |
| if (!end_time) |
| { |
| queue->waiting_threads++; |
| while (!g_queue_peek_tail (queue->queue)) |
| g_cond_wait(queue->cond, queue->mutex); |
| queue->waiting_threads--; |
| } |
| else |
| { |
| queue->waiting_threads++; |
| while (!g_queue_peek_tail (queue->queue)) |
| if (!g_cond_timed_wait (queue->cond, queue->mutex, end_time)) |
| break; |
| queue->waiting_threads--; |
| if (!g_queue_peek_tail (queue->queue)) |
| return NULL; |
| } |
| } |
| |
| retval = g_queue_pop_tail (queue->queue); |
| |
| g_assert (retval); |
| |
| return retval; |
| } |
| |
| gpointer |
| g_async_queue_pop (GAsyncQueue* queue) |
| { |
| gpointer retval; |
| |
| g_return_val_if_fail (queue, NULL); |
| g_return_val_if_fail (queue->ref_count > 0, NULL); |
| |
| g_mutex_lock (queue->mutex); |
| retval = g_async_queue_pop_intern_unlocked (queue, FALSE, NULL); |
| g_mutex_unlock (queue->mutex); |
| |
| return retval; |
| } |
| |
| gpointer |
| g_async_queue_pop_unlocked (GAsyncQueue* queue) |
| { |
| g_return_val_if_fail (queue, NULL); |
| g_return_val_if_fail (queue->ref_count > 0, NULL); |
| |
| return g_async_queue_pop_intern_unlocked (queue, FALSE, NULL); |
| } |
| |
| gpointer |
| g_async_queue_try_pop (GAsyncQueue* queue) |
| { |
| gpointer retval; |
| |
| g_return_val_if_fail (queue, NULL); |
| g_return_val_if_fail (queue->ref_count > 0, NULL); |
| |
| g_mutex_lock (queue->mutex); |
| retval = g_async_queue_pop_intern_unlocked (queue, TRUE, NULL); |
| g_mutex_unlock (queue->mutex); |
| |
| return retval; |
| } |
| |
| gpointer |
| g_async_queue_try_pop_unlocked (GAsyncQueue* queue) |
| { |
| g_return_val_if_fail (queue, NULL); |
| g_return_val_if_fail (queue->ref_count > 0, NULL); |
| |
| return g_async_queue_pop_intern_unlocked (queue, TRUE, NULL); |
| } |
| |
| gpointer |
| g_async_queue_timed_pop (GAsyncQueue* queue, GTimeVal *end_time) |
| { |
| gpointer retval; |
| |
| g_return_val_if_fail (queue, NULL); |
| g_return_val_if_fail (queue->ref_count > 0, NULL); |
| |
| g_mutex_lock (queue->mutex); |
| retval = g_async_queue_pop_intern_unlocked (queue, FALSE, end_time); |
| g_mutex_unlock (queue->mutex); |
| |
| return retval; |
| } |
| |
| gpointer |
| g_async_queue_timed_pop_unlocked (GAsyncQueue* queue, GTimeVal *end_time) |
| { |
| g_return_val_if_fail (queue, NULL); |
| g_return_val_if_fail (queue->ref_count > 0, NULL); |
| |
| return g_async_queue_pop_intern_unlocked (queue, FALSE, end_time); |
| } |
| |
| gint |
| g_async_queue_length_unlocked (GAsyncQueue* queue) |
| { |
| g_return_val_if_fail (queue, 0); |
| g_return_val_if_fail (queue->ref_count > 0, 0); |
| |
| return queue->queue->length - queue->waiting_threads; |
| } |
| |
| gint |
| g_async_queue_length(GAsyncQueue* queue) |
| { |
| glong retval; |
| |
| g_return_val_if_fail (queue, 0); |
| g_return_val_if_fail (queue->ref_count > 0, 0); |
| |
| g_mutex_lock (queue->mutex); |
| retval = queue->queue->length - queue->waiting_threads; |
| g_mutex_unlock (queue->mutex); |
| |
| return retval; |
| } |
| |