/**
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* \file
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* Lock free queue.
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*
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* (C) Copyright 2011 Novell, Inc
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*
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#ifndef __MONO_LOCKFREEQUEUE_H__
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#define __MONO_LOCKFREEQUEUE_H__
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#include <glib.h>
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#include <mono/utils/mono-publib.h>
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//#define QUEUE_DEBUG 1
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typedef struct _MonoLockFreeQueueNode MonoLockFreeQueueNode;
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struct _MonoLockFreeQueueNode {
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MonoLockFreeQueueNode * volatile next;
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#ifdef QUEUE_DEBUG
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gint32 in_queue;
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#endif
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};
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typedef struct {
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MonoLockFreeQueueNode node;
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volatile gint32 in_use;
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} MonoLockFreeQueueDummy;
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#define MONO_LOCK_FREE_QUEUE_NUM_DUMMIES 2
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typedef struct {
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MonoLockFreeQueueNode * volatile head;
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MonoLockFreeQueueNode * volatile tail;
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MonoLockFreeQueueDummy dummies [MONO_LOCK_FREE_QUEUE_NUM_DUMMIES];
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volatile gint32 has_dummy;
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} MonoLockFreeQueue;
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MONO_API void mono_lock_free_queue_init (MonoLockFreeQueue *q);
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MONO_API void mono_lock_free_queue_node_init (MonoLockFreeQueueNode *node, gboolean poison);
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MONO_API void mono_lock_free_queue_node_unpoison (MonoLockFreeQueueNode *node);
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MONO_API void mono_lock_free_queue_enqueue (MonoLockFreeQueue *q, MonoLockFreeQueueNode *node);
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MONO_API MonoLockFreeQueueNode* mono_lock_free_queue_dequeue (MonoLockFreeQueue *q);
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#endif
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