215 lines
7.6 KiB
C
215 lines
7.6 KiB
C
/****************************************************************************
|
|
* mq_internal.h
|
|
*
|
|
* Copyright (C) 2007 Gregory Nutt. All rights reserved.
|
|
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
*
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in
|
|
* the documentation and/or other materials provided with the
|
|
* distribution.
|
|
* 3. Neither the name Gregory Nutt nor the names of its contributors may be
|
|
* used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
|
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
|
|
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
|
|
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
|
|
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
|
|
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
|
|
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
|
|
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
* POSSIBILITY OF SUCH DAMAGE.
|
|
*
|
|
****************************************************************************/
|
|
|
|
#ifndef __MQ_INTERNAL_H
|
|
#define __MQ_INTERNAL_H
|
|
|
|
/****************************************************************************
|
|
* Included Files
|
|
****************************************************************************/
|
|
|
|
#include <sys/types.h>
|
|
#include <limits.h>
|
|
#include <mqueue.h>
|
|
#include <sched.h>
|
|
#include <signal.h>
|
|
#include <nuttx/compiler.h>
|
|
|
|
/****************************************************************************
|
|
* Compilations Switches
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Definitions
|
|
****************************************************************************/
|
|
|
|
#define MQ_MAX_BYTES CONFIG_MQ_MAXMSGSIZE
|
|
#define MQ_MAX_MSGS 16
|
|
#define MQ_PRIO_MAX _POSIX_MQ_PRIO_MAX
|
|
|
|
/* This defines the number of messages descriptors to allocate
|
|
* at each "gulp."
|
|
*/
|
|
|
|
#define NUM_MSG_DESCRIPTORS 24
|
|
|
|
/* This defines the number of messages to set aside for
|
|
* exclusive use by interrupt handlers
|
|
*/
|
|
|
|
#define NUM_INTERRUPT_MSGS 8
|
|
|
|
/****************************************************************************
|
|
* Global Type Declarations
|
|
****************************************************************************/
|
|
|
|
enum mqalloc_e
|
|
{
|
|
MQ_ALLOC_FIXED = 0, /* pre-allocated; never freed */
|
|
MQ_ALLOC_DYN, /* dynamically allocated; free when unused */
|
|
MQ_ALLOC_IRQ /* Preallocated, reserved for interrupt handling */
|
|
};
|
|
typedef enum mqalloc_e mqalloc_t;
|
|
|
|
/* This structure describes one buffered POSIX message. */
|
|
|
|
struct mqmsg
|
|
{
|
|
FAR struct mqmsg *next; /* Forward link to next message */
|
|
ubyte type; /* (Used to manage allocations) */
|
|
ubyte priority; /* priority of message */
|
|
#if MQ_MAX_BYTES < 256
|
|
ubyte msglen; /* Message data length */
|
|
#else
|
|
uint16 msglen; /* Message data length */
|
|
#endif
|
|
ubyte mail[MQ_MAX_BYTES]; /* Message data */
|
|
};
|
|
typedef struct mqmsg mqmsg_t;
|
|
|
|
/* This structure defines a message queue */
|
|
|
|
struct mq_des; /* forward reference */
|
|
|
|
struct msgq_s
|
|
{
|
|
FAR struct msgq_s *flink; /* Forward link to next message queue */
|
|
sq_queue_t msglist; /* Prioritized message list */
|
|
sint16 maxmsgs; /* Maximum number of messages in the queue */
|
|
sint16 nmsgs; /* Number of message in the queue */
|
|
sint16 nconnect; /* Number of connections to message queue */
|
|
sint16 nwaitnotfull; /* Number tasks waiting for not full */
|
|
sint16 nwaitnotempty; /* Number tasks waiting for not empty */
|
|
ubyte maxmsgsize; /* Max size of message in message queue */
|
|
boolean unlinked; /* TRUE if the msg queue has been unlinked */
|
|
#ifndef CONFIG_DISABLE_SIGNALS
|
|
FAR struct mq_des *ntmqdes; /* Notification: Owning mqdes (NULL if none) */
|
|
pid_t ntpid; /* Notification: Receiving Task's PID */
|
|
int ntsigno; /* Notification: Signal number */
|
|
union sigval ntvalue; /* Notification: Signal value */
|
|
#endif
|
|
char name[1]; /* Start of the queue name */
|
|
};
|
|
|
|
#define SIZEOF_MQ_HEADER ((int)(((msgq_t*)NULL)->name))
|
|
|
|
/* This describes the message queue descriptor that is held in the
|
|
* task's TCB
|
|
*/
|
|
|
|
struct mq_des
|
|
{
|
|
FAR struct mq_des *flink; /* Forward link to next message descriptor */
|
|
FAR msgq_t *msgq; /* Pointer to associated message queue */
|
|
int oflags; /* Flags set when message queue was opened */
|
|
};
|
|
|
|
/****************************************************************************
|
|
* Global Variables
|
|
****************************************************************************/
|
|
|
|
/* This is a list of all opened message queues */
|
|
|
|
extern sq_queue_t g_msgqueues;
|
|
|
|
/* The g_msgfree is a list of messages that are available
|
|
* for general use. The number of messages in this list is a
|
|
* system configuration item.
|
|
*/
|
|
|
|
extern sq_queue_t g_msgfree;
|
|
|
|
/* The g_msgfreeInt is a list of messages that are reserved
|
|
* for use by interrupt handlers.
|
|
*/
|
|
|
|
extern sq_queue_t g_msgfreeirq;
|
|
|
|
/* The g_desfree data structure is a list of message
|
|
* descriptors available to the operating system for general use.
|
|
* The number of messages in the pool is a constant.
|
|
*/
|
|
|
|
extern sq_queue_t g_desfree;
|
|
|
|
/****************************************************************************
|
|
* Global Function Prototypes
|
|
****************************************************************************/
|
|
|
|
#ifdef __cplusplus
|
|
#define EXTERN extern "C"
|
|
extern "C" {
|
|
#else
|
|
#define EXTERN extern
|
|
#endif
|
|
|
|
/* Functions defined in mq_initialize.c ************************************/
|
|
|
|
EXTERN void weak_function mq_initialize(void);
|
|
EXTERN void mq_desblockalloc(void);
|
|
|
|
EXTERN mqd_t mq_descreate(FAR _TCB* mtcb, FAR msgq_t* msgq, int oflags);
|
|
EXTERN FAR msgq_t *mq_findnamed(const char *mq_name);
|
|
EXTERN void mq_msgfree(FAR mqmsg_t *mqmsg);
|
|
EXTERN void mq_msgqfree(FAR msgq_t *msgq);
|
|
|
|
/* mq_waitirq.c ************************************************************/
|
|
|
|
EXTERN void mq_waitirq(FAR _TCB *wtcb);
|
|
|
|
/* mq_rcvinternal.c ********************************************************/
|
|
|
|
EXTERN int mq_verifyreceive(mqd_t mqdes, void *msg, size_t msglen);
|
|
EXTERN FAR mqmsg_t *mq_waitreceive(mqd_t mqdes);
|
|
EXTERN ssize_t mq_doreceive(mqd_t mqdes, mqmsg_t *mqmsg, void *ubuffer,
|
|
int *prio);
|
|
|
|
/* mq_sndinternal.c ********************************************************/
|
|
|
|
EXTERN int mq_verifysend(mqd_t mqdes, const void *msg, size_t msglen,
|
|
int prio);
|
|
EXTERN FAR mqmsg_t *mq_msgalloc(void);
|
|
EXTERN int mq_waitsend(mqd_t mqdes);
|
|
EXTERN int mq_dosend(mqd_t mqdes, FAR mqmsg_t *mqmsg, const void *msg,
|
|
size_t msglen, int prio);
|
|
|
|
#undef EXTERN
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif /* __MQ_INTERNAL_H */
|
|
|