/* SPDX-License-Identifier: BSD-2-Clause */
/**
* @file
*
* @ingroup RTEMSScoreMessageQueue
*
* @brief This source file contains the implementation of
* _CORE_message_queue_Seize().
*/
/*
* COPYRIGHT (c) 1989-2007.
* On-Line Applications Research Corporation (OAR).
*
* 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.
*
* 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.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <rtems/score/chain.h>
#include <rtems/score/isr.h>
#include <rtems/score/coremsgimpl.h>
#include <rtems/score/threadimpl.h>
#include <rtems/score/statesimpl.h>
Status_Control _CORE_message_queue_Seize(
CORE_message_queue_Control *the_message_queue,
Thread_Control *executing,
void *buffer,
size_t *size_p,
bool wait,
Thread_queue_Context *queue_context
)
{
CORE_message_queue_Buffer *the_message;
the_message = _CORE_message_queue_Get_pending_message( the_message_queue );
if ( the_message != NULL ) {
the_message_queue->number_of_pending_messages -= 1;
*size_p = the_message->size;
executing->Wait.count =
_CORE_message_queue_Get_message_priority( the_message );
_CORE_message_queue_Copy_buffer( the_message->buffer, buffer, *size_p );
#if !defined(RTEMS_SCORE_COREMSG_ENABLE_BLOCKING_SEND)
/*
* There is not an API with blocking sends enabled.
* So return immediately.
*/
_CORE_message_queue_Free_message_buffer(the_message_queue, the_message);
_CORE_message_queue_Release( the_message_queue, queue_context );
return STATUS_SUCCESSFUL;
#else
{
Thread_queue_Heads *heads;
Thread_Control *the_thread;
/*
* There could be a thread waiting to send a message. If there
* is not, then we can go ahead and free the buffer.
*
* NOTE: If we note that the queue was not full before this receive,
* then we can avoid this dequeue.
*/
heads = the_message_queue->Wait_queue.Queue.heads;
if ( heads == NULL ) {
_CORE_message_queue_Free_message_buffer(
the_message_queue,
the_message
);
_CORE_message_queue_Release( the_message_queue, queue_context );
return STATUS_SUCCESSFUL;
}
the_thread = ( *the_message_queue->operations->surrender )(
&the_message_queue->Wait_queue.Queue,
heads,
NULL,
queue_context
);
/*
* There was a thread waiting to send a message. This code
* puts the messages in the message queue on behalf of the
* waiting task.
*/
_CORE_message_queue_Insert_message(
the_message_queue,
the_message,
the_thread->Wait.return_argument_second.immutable_object,
(size_t) the_thread->Wait.option,
(CORE_message_queue_Submit_types) the_thread->Wait.count
);
_Thread_queue_Resume(
&the_message_queue->Wait_queue.Queue,
the_thread,
queue_context
);
return STATUS_SUCCESSFUL;
}
#endif
}
if ( !wait ) {
_CORE_message_queue_Release( the_message_queue, queue_context );
return STATUS_UNSATISFIED;
}
executing->Wait.return_argument_second.mutable_object = buffer;
executing->Wait.return_argument = size_p;
/* Wait.count will be filled in with the message priority */
_Thread_queue_Context_set_thread_state(
queue_context,
STATES_WAITING_FOR_MESSAGE
);
_Thread_queue_Enqueue(
&the_message_queue->Wait_queue.Queue,
the_message_queue->operations,
executing,
queue_context
);
return _Thread_Wait_get_status( executing );
}