145 lines
3.2 KiB
C
145 lines
3.2 KiB
C
/*
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* uhub - A tiny ADC p2p connection hub
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* Copyright (C) 2007-2009, Jan Vidar Krey
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#include "uhub.h"
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#ifdef EQ_DEBUG
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static void eq_debug(const char* prefix, struct event_data* data)
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{
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LOG_DUMP(">>> %s: %p, id: %x, flags=%d\n", prefix, data, data->id, data->flags);
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}
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#endif
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int event_queue_initialize(struct event_queue** queue, event_queue_callback callback, void* ptr)
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{
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*queue = (struct event_queue*) hub_malloc_zero(sizeof(struct event_queue));
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if (!(*queue))
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return -1;
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(*queue)->q1 = list_create();
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(*queue)->q2 = list_create();
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if (!(*queue)->q1 || !(*queue)->q2)
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{
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list_destroy((*queue)->q1);
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list_destroy((*queue)->q2);
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return -1;
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}
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(*queue)->callback = callback;
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(*queue)->callback_data = ptr;
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return 0;
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}
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void event_queue_shutdown(struct event_queue* queue)
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{
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/* Should be empty at this point! */
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list_destroy(queue->q1);
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list_destroy(queue->q2);
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hub_free(queue);
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}
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static void event_queue_cleanup_callback(void* ptr)
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{
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#ifdef EQ_DEBUG
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struct event_data* data = (struct event_data*) ptr;
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eq_debug("NUKE", data);
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#endif
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hub_free((struct event_data*) ptr);
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}
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int event_queue_process(struct event_queue* queue)
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{
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struct event_data* data;
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if (queue->locked)
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return 0;
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/* lock primary queue, and handle the primary queue messages. */
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queue->locked = 1;
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data = (struct event_data*) list_get_first(queue->q1);
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while (data)
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{
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#ifdef EQ_DEBUG
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eq_debug("EXEC", data);
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#endif
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queue->callback(queue->callback_data, data);
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data = (struct event_data*) list_get_next(queue->q1);
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}
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list_clear(queue->q1, event_queue_cleanup_callback);
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assert(list_size(queue->q1) == 0);
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/* unlock queue */
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queue->locked = 0;
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/* transfer from secondary queue to the primary queue. */
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data = (struct event_data*) list_get_first(queue->q2);
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while (data)
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{
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list_remove(queue->q2, data);
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list_append(queue->q1, data);
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data = (struct event_data*) list_get_first(queue->q2);
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}
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/* if more events exist, schedule it */
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if (list_size(queue->q1))
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{
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return 1;
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}
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return 0;
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}
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void event_queue_post(struct event_queue* queue, struct event_data* message)
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{
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struct linked_list* q = (!queue->locked) ? queue->q1 : queue->q2;
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struct event_data* data;
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data = (struct event_data*) hub_malloc(sizeof(struct event_data));
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if (data)
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{
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data->id = message->id;
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data->ptr = message->ptr;
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data->flags = message->flags;
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#ifdef EQ_DEBUG
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eq_debug("POST", data);
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#endif
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list_append(q, data);
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}
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else
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{
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LOG_ERROR("event_queue_post: OUT OF MEMORY");
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}
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}
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size_t event_queue_size(struct event_queue* queue)
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{
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return list_size(queue->q1) + list_size(queue->q2);
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}
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