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124 lines
4.6 KiB
124 lines
4.6 KiB
/**************************************************************************** |
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* include/nuttx/mqueue.h |
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* |
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* Copyright (C) 2007, 2009, 2011 Gregory Nutt. All rights reserved. |
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* Author: Gregory Nutt <gnutt@nuttx.org> |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in |
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* the documentation and/or other materials provided with the |
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* distribution. |
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* 3. Neither the name NuttX nor the names of its contributors may be |
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* used to endorse or promote products derived from this software |
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* without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE |
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, |
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, |
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS |
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED |
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN |
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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* POSSIBILITY OF SUCH DAMAGE. |
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* |
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****************************************************************************/ |
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#ifndef ___INCLUDE_NUTTX_MQUEUE_H |
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#define ___INCLUDE_NUTTX_MQUEUE_H |
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/**************************************************************************** |
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* Included Files |
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****************************************************************************/ |
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#include <nuttx/config.h> |
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#include <nuttx/compiler.h> |
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#include <sys/types.h> |
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#include <stdint.h> |
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#include <stdbool.h> |
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#include <mqueue.h> |
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#include <queue.h> |
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#include <signal.h> |
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#if CONFIG_MQ_MAXMSGSIZE > 0 |
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/**************************************************************************** |
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* Definitions |
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****************************************************************************/ |
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/**************************************************************************** |
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* Global Type Declarations |
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****************************************************************************/ |
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/* This structure defines a message queue */ |
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struct mq_des; /* forward reference */ |
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struct msgq_s |
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{ |
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FAR struct msgq_s *flink; /* Forward link to next message queue */ |
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sq_queue_t msglist; /* Prioritized message list */ |
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int16_t maxmsgs; /* Maximum number of messages in the queue */ |
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int16_t nmsgs; /* Number of message in the queue */ |
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int16_t nconnect; /* Number of connections to message queue */ |
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int16_t nwaitnotfull; /* Number tasks waiting for not full */ |
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int16_t nwaitnotempty; /* Number tasks waiting for not empty */ |
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uint8_t maxmsgsize; /* Max size of message in message queue */ |
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bool unlinked; /* true if the msg queue has been unlinked */ |
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#ifndef CONFIG_DISABLE_SIGNALS |
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FAR struct mq_des *ntmqdes; /* Notification: Owning mqdes (NULL if none) */ |
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pid_t ntpid; /* Notification: Receiving Task's PID */ |
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int ntsigno; /* Notification: Signal number */ |
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union sigval ntvalue; /* Notification: Signal value */ |
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#endif |
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char name[1]; /* Start of the queue name */ |
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}; |
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typedef struct msgq_s msgq_t; |
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#define SIZEOF_MQ_HEADER ((int)(((msgq_t*)NULL)->name)) |
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/* This describes the message queue descriptor that is held in the |
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* task's TCB |
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*/ |
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struct mq_des |
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{ |
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FAR struct mq_des *flink; /* Forward link to next message descriptor */ |
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FAR msgq_t *msgq; /* Pointer to associated message queue */ |
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int oflags; /* Flags set when message queue was opened */ |
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}; |
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/**************************************************************************** |
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* Global Variables |
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****************************************************************************/ |
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/**************************************************************************** |
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* Global Function Prototypes |
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****************************************************************************/ |
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#ifdef __cplusplus |
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#define EXTERN extern "C" |
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extern "C" { |
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#else |
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#define EXTERN extern |
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#endif |
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#undef EXTERN |
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#ifdef __cplusplus |
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} |
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#endif |
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#endif /* CONFIG_MQ_MAXMSGSIZE > 0 */ |
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#endif /* ___INCLUDE_NUTTX_MQUEUE_H */ |
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