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/*
*------------------------------------------------------------------
* unix_shared_memory_queue.h - shared-memory queues
*
* Copyright (c) 2009 Cisco and/or its affiliates.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*------------------------------------------------------------------
*/
#ifndef included_unix_shared_memory_queue_h
#define included_unix_shared_memory_queue_h
#include <pthread.h>
#include <vppinfra/mem.h>
typedef struct _unix_shared_memory_queue {
pthread_mutex_t mutex; /* 8 bytes */
pthread_cond_t condvar; /* 8 bytes */
int head;
int tail;
int cursize;
int maxsize;
int elsize;
int consumer_pid;
int signal_when_queue_non_empty;
char data[0];
} unix_shared_memory_queue_t;
unix_shared_memory_queue_t *
unix_shared_memory_queue_init(int nels,
int elsize,
int consumer_pid,
int signal_when_queue_non_empty);
void unix_shared_memory_queue_free(unix_shared_memory_queue_t *q);
int unix_shared_memory_queue_add (unix_shared_memory_queue_t *q,
u8 *elem, int nowait);
int unix_shared_memory_queue_sub(unix_shared_memory_queue_t *q,
u8 *elem, int nowait);
void unix_shared_memory_queue_lock (unix_shared_memory_queue_t *q);
void unix_shared_memory_queue_unlock (unix_shared_memory_queue_t *q);
int unix_shared_memory_queue_is_full (unix_shared_memory_queue_t *q);
int unix_shared_memory_queue_add_nolock (unix_shared_memory_queue_t *q,
u8 *elem);
int unix_shared_memory_queue_sub_raw (unix_shared_memory_queue_t *q,
u8 *elem);
int unix_shared_memory_queue_add_raw (unix_shared_memory_queue_t *q,
u8 *elem);
#endif /* included_unix_shared_memory_queue_h */
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