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nuttx/sched/mq_internal.h
patacongo b08a86171f NuttX RTOS 
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@3 42af7a65-404d-4744-a932-0658087f49c3
2007-02-17 23:21:28 +00:00

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/************************************************************
* 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 <mqueue.h>
#include <sched.h>
#include <nuttx/compiler.h>
/************************************************************
* Compilations Switches
************************************************************/
/************************************************************
* Definitions
************************************************************/
#define MQ_MAX_BYTES CONFIG_MQ_MAXMSGSIZE
#define MQ_MAX_HWORDS ((MQ_MAX_BYTES + sizeof(uint16) - 1) / sizeof(uint16))
#define MQ_MAX_MSGS 16
#define MQ_PRIO_MAX 255
/* 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. */
/* NOTE: This structure is allocated from the same pool as MQ_type.
* Therefore, (1) it must have a fixed "mail" size, and (2) must
* exactly match MQ_type in size.
*/
struct mqmsg
{
/* The position of the following two field must exactly match
* MQ_type.
*/
struct mqmsg *next; /* Forward link to next message */
ubyte type; /* (Used to manage allocations) */
ubyte priority; /* priority of message */
ubyte msglen; /* Message data length */
ubyte pad; /* Not used */
uint16 mail[MQ_MAX_HWORDS]; /* Message data */
};
typedef struct mqmsg mqmsg_t;
/* This structure defines a message queue */
struct msgq_s
{
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 */
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 */
char name[1]; /* Start of the queue name */
};
typedef struct msgq_s msgq_t;
#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
{
struct mq_des *flink; /* Forward link to next message descriptor */
msgq_t *msgq; /* Pointer to associated message queue */
int oflags; /* Flags set when message queue was opened */
};
/* This is the handle used to reference a message queue */
typedef struct mq_des *mqd_t;
/************************************************************
* 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_initialized.c *******************/
EXTERN void weak_function mq_initialize(void);
EXTERN void mq_desblockalloc(void);
EXTERN mqd_t mq_descreate(_TCB* mtcb, msgq_t* msgq, int oflags);
EXTERN msgq_t *mq_findnamed(const char *mq_name);
EXTERN void mq_msgfree(mqmsg_t *mqmsg);
EXTERN void mq_msgqfree(msgq_t *msgq);
#undef EXTERN
#ifdef __cplusplus
}
#endif
#endif /* __MQ_INTERNAL_H */
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