queue.h

/*
 * Copyright (C) 2011 Philippe Gerum <rpm@xenomai.org>.
 *
 * 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.
 */
#ifndef _XENOMAI_ALCHEMY_QUEUE_H
#define _XENOMAI_ALCHEMY_QUEUE_H

#include <stdint.h>
#include <alchemy/timer.h>

#define Q_PRIO  0x1     /* Pend by task priority order. */
#define Q_FIFO  0x0     /* Pend by FIFO order. */

#define Q_UNLIMITED 0   /* No size limit. */

/*
 * Operation flags.
 */
#define Q_NORMAL     0x0
#define Q_URGENT     0x1
#define Q_BROADCAST  0x2

struct RT_QUEUE {
        uintptr_t handle;
};

typedef struct RT_QUEUE RT_QUEUE;

struct RT_QUEUE_INFO {
        int nwaiters;
        int nmessages;
        int mode;
        size_t qlimit;
        size_t poolsize;
        size_t usedmem;
        char name[XNOBJECT_NAME_LEN];
};

typedef struct RT_QUEUE_INFO RT_QUEUE_INFO;

#ifdef __cplusplus
extern "C" {
#endif

int rt_queue_create(RT_QUEUE *queue,
                    const char *name,
                    size_t poolsize, size_t qlimit, int mode);

int rt_queue_delete(RT_QUEUE *queue);

void *rt_queue_alloc(RT_QUEUE *queue,
                     size_t size);

int rt_queue_free(RT_QUEUE *queue,
                  void *buf);

int rt_queue_send(RT_QUEUE *queue,
                  const void *buf, size_t size, int mode);

int rt_queue_write(RT_QUEUE *queue,
                   const void *buf, size_t size, int mode);

ssize_t rt_queue_receive_timed(RT_QUEUE *queue,
                               void **bufp,
                               const struct timespec *abs_timeout);

static inline
ssize_t rt_queue_receive_until(RT_QUEUE *queue,
                               void **bufp, RTIME timeout)
{
        struct timespec ts;
        return rt_queue_receive_timed(queue, bufp,
                                      alchemy_abs_timeout(timeout, &ts));
}

static inline
ssize_t rt_queue_receive(RT_QUEUE *queue,
                         void **bufp, RTIME timeout)
{
        struct timespec ts;
        return rt_queue_receive_timed(queue, bufp,
                                      alchemy_rel_timeout(timeout, &ts));
}

ssize_t rt_queue_read_timed(RT_QUEUE *queue,
                            void *buf, size_t size,
                            const struct timespec *abs_timeout);

static inline
ssize_t rt_queue_read_until(RT_QUEUE *queue,
                            void *buf, size_t size, RTIME timeout)
{
        struct timespec ts;
        return rt_queue_read_timed(queue, buf, size,
                                   alchemy_abs_timeout(timeout, &ts));
}

static inline
ssize_t rt_queue_read(RT_QUEUE *queue,
                      void *buf, size_t size, RTIME timeout)
{
        struct timespec ts;
        return rt_queue_read_timed(queue, buf, size,
                                   alchemy_rel_timeout(timeout, &ts));
}

int rt_queue_flush(RT_QUEUE *queue);

int rt_queue_inquire(RT_QUEUE *queue,
                     RT_QUEUE_INFO *info);

int rt_queue_bind(RT_QUEUE *queue,
                  const char *name,
                  RTIME timeout);

int rt_queue_unbind(RT_QUEUE *queue);

#ifdef __cplusplus
}
#endif

#endif /* _XENOMAI_ALCHEMY_QUEUE_H */