/**************************************************************************** * sched/mqueue/mqueue.h * * Copyright (C) 2007, 2009, 2011, 2013-2014 Gregory Nutt. All rights reserved. * Author: Gregory Nutt * * 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 NuttX 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 __SCHED_MQUEUE_MQUEUE_H #define __SCHED_MQUEUE_MQUEUE_H /**************************************************************************** * Included Files ****************************************************************************/ #include #include #include #include #include #include #include #include #include #include #if CONFIG_MQ_MAXMSGSIZE > 0 /**************************************************************************** * Pre-processor 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 /**************************************************************************** * Public Type Definitions ****************************************************************************/ 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 */ }; /* This structure describes one buffered POSIX message. */ struct mqueue_msg_s { FAR struct mqueue_msg_s *next; /* Forward link to next message */ uint8_t type; /* (Used to manage allocations) */ uint8_t priority; /* priority of message */ #if MQ_MAX_BYTES < 256 uint8_t msglen; /* Message data length */ #else uint16_t msglen; /* Message data length */ #endif char mail[MQ_MAX_BYTES]; /* Message data */ }; /**************************************************************************** * Public Variables ****************************************************************************/ #ifdef __cplusplus #define EXTERN extern "C" extern "C" { #else #define EXTERN extern #endif /* 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; /**************************************************************************** * Public Function Prototypes ****************************************************************************/ /* Functions defined in mq_initialize.c ************************************/ void weak_function mq_initialize(void); void mq_desblockalloc(void); FAR struct mqueue_inode_s *mq_findnamed(FAR const char *mq_name); void mq_msgfree(FAR struct mqueue_msg_s *mqmsg); /* mq_waitirq.c ************************************************************/ void mq_waitirq(FAR struct tcb_s *wtcb, int errcode); /* mq_rcvinternal.c ********************************************************/ int mq_verifyreceive(mqd_t mqdes, FAR char *msg, size_t msglen); FAR struct mqueue_msg_s *mq_waitreceive(mqd_t mqdes); ssize_t mq_doreceive(mqd_t mqdes, FAR struct mqueue_msg_s *mqmsg, FAR char *ubuffer, FAR int *prio); /* mq_sndinternal.c ********************************************************/ int mq_verifysend(mqd_t mqdes, FAR const char *msg, size_t msglen, int prio); FAR struct mqueue_msg_s *mq_msgalloc(void); int mq_waitsend(mqd_t mqdes); int mq_dosend(mqd_t mqdes, FAR struct mqueue_msg_s *mqmsg, FAR const char *msg, size_t msglen, int prio); /* mq_release.c ************************************************************/ struct task_group_s; /* Forward reference */ void mq_release(FAR struct task_group_s *group); /* mq_recover.c ************************************************************/ void mq_recover(FAR struct tcb_s *tcb); #undef EXTERN #ifdef __cplusplus } #endif #endif /* CONFIG_MQ_MAXMSGSIZE > 0 */ #endif /* __SCHED_MQUEUE_MQUEUE_H */