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/*
*------------------------------------------------------------------
* svm_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_svm_queue_h
#define included_svm_queue_h
#include <pthread.h>
typedef struct _svm_queue
{
pthread_mutex_t mutex; /* 8 bytes */
pthread_cond_t condvar; /* 8 bytes */
int head;
int tail;
volatile int cursize;
int maxsize;
int elsize;
int consumer_pid;
int signal_when_queue_non_empty;
char data[0];
} svm_queue_t;
typedef enum
{
/**
* blocking call
*/
SVM_Q_WAIT = 0,
/**
* non-blocking call
*/
SVM_Q_NOWAIT,
/**
* blocking call, return on signal or time-out
*/
SVM_Q_TIMEDWAIT,
} svm_q_conditional_wait_t;
svm_queue_t *svm_queue_init (int nels,
int elsize,
int consumer_pid,
int signal_when_queue_non_empty);
void svm_queue_free (svm_queue_t * q);
int svm_queue_add (svm_queue_t * q, u8 * elem, int nowait);
int svm_queue_add2 (svm_queue_t * q, u8 * elem, u8 * elem2, int nowait);
int svm_queue_sub (svm_queue_t * q, u8 * elem, svm_q_conditional_wait_t cond,
u32 time);
int svm_queue_sub2 (svm_queue_t * q, u8 * elem);
void svm_queue_lock (svm_queue_t * q);
void svm_queue_unlock (svm_queue_t * q);
int svm_queue_is_full (svm_queue_t * q);
int svm_queue_add_nolock (svm_queue_t * q, u8 * elem);
int svm_queue_sub_raw (svm_queue_t * q, u8 * elem);
/**
* Add element to queue with mutex held
* @param q queue
* @param elem pointer element data to add
*/
void svm_queue_add_raw (svm_queue_t * q, u8 * elem);
/*
* DEPRECATED please use svm_queue_t instead
*/
typedef svm_queue_t unix_shared_memory_queue_t;
#endif /* included_svm_queue_h */
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
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