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/**************************************************************************/
/* */
/* Copyright (c) Microsoft Corporation. All rights reserved. */
/* */
/* This software is licensed under the Microsoft Software License */
/* Terms for Microsoft Azure RTOS. Full text of the license can be */
/* found in the LICENSE file at https://aka.ms/AzureRTOS_EULA */
/* and in the root directory of this software. */
/* */
/**************************************************************************/
/**************************************************************************/
/**************************************************************************/
/** */
/** ThreadX Component */
/** */
/** Queue */
/** */
/**************************************************************************/
/**************************************************************************/
#define TX_SOURCE_CODE
/* Include necessary system files. */
#include "tx_api.h"
#include "tx_trace.h"
#include "tx_queue.h"
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _tx_queue_create PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* William E. Lamie, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function creates a message queue. The message size and depth */
/* of the queue is specified by the caller. */
/* */
/* INPUT */
/* */
/* queue_ptr Pointer to queue control block */
/* name_ptr Pointer to queue name */
/* message_size Size of each queue message */
/* queue_start Starting address of the queue area*/
/* queue_size Number of bytes in the queue */
/* */
/* OUTPUT */
/* */
/* TX_SUCCESS Successful completion status */
/* */
/* CALLS */
/* */
/* None */
/* */
/* CALLED BY */
/* */
/* Application Code */
/* */
/* RELEASE HISTORY */
/* */
/* DATE NAME DESCRIPTION */
/* */
/* 05-19-2020 William E. Lamie Initial Version 6.0 */
/* 09-30-2020 Yuxin Zhou Modified comment(s), */
/* resulting in version 6.1 */
/* */
/**************************************************************************/
UINT _tx_queue_create(TX_QUEUE *queue_ptr, CHAR *name_ptr, UINT message_size,
VOID *queue_start, ULONG queue_size)
{
TX_INTERRUPT_SAVE_AREA
UINT capacity;
UINT used_words;
TX_QUEUE *next_queue;
TX_QUEUE *previous_queue;
/* Initialize queue control block to all zeros. */
TX_MEMSET(queue_ptr, 0, (sizeof(TX_QUEUE)));
/* Setup the basic queue fields. */
queue_ptr -> tx_queue_name = name_ptr;
/* Save the message size in the control block. */
queue_ptr -> tx_queue_message_size = message_size;
/* Determine how many messages will fit in the queue area and the number
of ULONGs used. */
capacity = (UINT) (queue_size / ((ULONG) (((ULONG) message_size) * (sizeof(ULONG)))));
used_words = capacity * message_size;
/* Save the starting address and calculate the ending address of
the queue. Note that the ending address is really one past the
end! */
queue_ptr -> tx_queue_start = TX_VOID_TO_ULONG_POINTER_CONVERT(queue_start);
queue_ptr -> tx_queue_end = TX_ULONG_POINTER_ADD(queue_ptr -> tx_queue_start, used_words);
/* Set the read and write pointers to the beginning of the queue
area. */
queue_ptr -> tx_queue_read = TX_VOID_TO_ULONG_POINTER_CONVERT(queue_start);
queue_ptr -> tx_queue_write = TX_VOID_TO_ULONG_POINTER_CONVERT(queue_start);
/* Setup the number of enqueued messages and the number of message
slots available in the queue. */
queue_ptr -> tx_queue_available_storage = (UINT) capacity;
queue_ptr -> tx_queue_capacity = (UINT) capacity;
/* Disable interrupts to put the queue on the created list. */
TX_DISABLE
/* Setup the queue ID to make it valid. */
queue_ptr -> tx_queue_id = TX_QUEUE_ID;
/* Place the queue on the list of created queues. First,
check for an empty list. */
if (_tx_queue_created_count == TX_EMPTY)
{
/* The created queue list is empty. Add queue to empty list. */
_tx_queue_created_ptr = queue_ptr;
queue_ptr -> tx_queue_created_next = queue_ptr;
queue_ptr -> tx_queue_created_previous = queue_ptr;
}
else
{
/* This list is not NULL, add to the end of the list. */
next_queue = _tx_queue_created_ptr;
previous_queue = next_queue -> tx_queue_created_previous;
/* Place the new queue in the list. */
next_queue -> tx_queue_created_previous = queue_ptr;
previous_queue -> tx_queue_created_next = queue_ptr;
/* Setup this queues's created links. */
queue_ptr -> tx_queue_created_previous = previous_queue;
queue_ptr -> tx_queue_created_next = next_queue;
}
/* Increment the created queue count. */
_tx_queue_created_count++;
/* Optional queue create extended processing. */
TX_QUEUE_CREATE_EXTENSION(queue_ptr)
/* If trace is enabled, register this object. */
TX_TRACE_OBJECT_REGISTER(TX_TRACE_OBJECT_TYPE_QUEUE, queue_ptr, name_ptr, queue_size, message_size)
/* If trace is enabled, insert this event into the trace buffer. */
TX_TRACE_IN_LINE_INSERT(TX_TRACE_QUEUE_CREATE, queue_ptr, message_size, TX_POINTER_TO_ULONG_CONVERT(queue_start), queue_size, TX_TRACE_QUEUE_EVENTS)
/* Log this kernel call. */
TX_EL_QUEUE_CREATE_INSERT
/* Restore interrupts. */
TX_RESTORE
/* Return TX_SUCCESS. */
return(TX_SUCCESS);
}