252 lines
8.8 KiB
C
252 lines
8.8 KiB
C
/****************************************************************************
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* net/udp/udp_notifier.c
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*
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* Copyright (C) 2018-2019 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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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <sys/types.h>
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#include <assert.h>
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#include <nuttx/wqueue.h>
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#include <nuttx/mm/iob.h>
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#include "udp/udp.h"
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#ifdef CONFIG_NET_UDP_NOTIFIER
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: udp_readahead_notifier_setup
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*
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* Description:
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* Set up to perform a callback to the worker function when an UDP data
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* is added to the read-ahead buffer. The worker function will execute
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* on the low priority worker thread.
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*
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* Input Parameters:
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* worker - The worker function to execute on the low priority work
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* queue when data is available in the UDP read-ahead buffer.
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* conn - The UDP connection where read-ahead data is needed.
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* arg - A user-defined argument that will be available to the worker
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* function when it runs.
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*
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* Returned Value:
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* > 0 - The notification is in place. The returned value is a key that
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* may be used later in a call to udp_notifier_teardown().
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* == 0 - There is already buffered read-ahead data. No notification
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* will be provided.
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* < 0 - An unexpected error occurred and notification will occur. The
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* returned value is a negated errno value that indicates the
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* nature of the failure.
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*
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****************************************************************************/
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int udp_readahead_notifier_setup(worker_t worker,
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FAR struct udp_conn_s *conn,
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FAR void *arg)
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{
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struct work_notifier_s info;
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DEBUGASSERT(worker != NULL);
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/* If there is already buffered read-ahead data, then return zero without
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* setting up the notification.
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*/
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if (conn->readahead.qh_head != NULL)
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{
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return 0;
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}
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/* Otherwise, this is just a simple wrapper around work_notifer_setup(). */
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info.evtype = WORK_UDP_READAHEAD;
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info.qid = LPWORK;
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info.qualifier = conn;
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info.arg = arg;
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info.worker = worker;
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return work_notifier_setup(&info);
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}
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/****************************************************************************
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* Name: udp_writebuffer_notifier_setup
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*
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* Description:
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* Set up to perform a callback to the worker function when an UDP write
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* buffer is emptied. The worker function will execute on the high
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* priority worker thread.
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*
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* Input Parameters:
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* worker - The worker function to execute on the low priority work
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* queue when data is available in the UDP read-ahead buffer.
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* conn - The UDP connection where read-ahead data is needed.
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* arg - A user-defined argument that will be available to the worker
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* function when it runs.
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*
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* Returned Value:
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* > 0 - The notification is in place. The returned value is a key that
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* may be used later in a call to udp_notifier_teardown().
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* == 0 - There is already buffered read-ahead data. No notification
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* will be provided.
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* < 0 - An unexpected error occurred and no notification will occur.
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* The returned value is a negated errno value that indicates the
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* nature of the failure.
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*
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****************************************************************************/
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int udp_writebuffer_notifier_setup(worker_t worker,
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FAR struct udp_conn_s *conn,
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FAR void *arg)
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{
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#ifdef CONFIG_NET_UDP_WRITE_BUFFERS
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struct work_notifier_s info;
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DEBUGASSERT(worker != NULL);
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/* If there is already buffered read-ahead data, then return zero without
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* setting up the notification.
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*/
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if (sq_empty(&conn->write_q))
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{
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return 0;
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}
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/* Otherwise, this is just a simple wrapper around work_notifer_setup(). */
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info.evtype = WORK_UDP_WRITEBUFFER;
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info.qid = LPWORK;
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info.qualifier = conn;
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info.arg = arg;
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info.worker = worker;
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return work_notifier_setup(&info);
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#else
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return 0;
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#endif
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}
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/****************************************************************************
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* Name: udp_notifier_teardown
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*
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* Description:
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* Eliminate a UDP read-ahead notification previously setup by
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* udp_readahead_notifier_setup(). This function should only be called if the
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* notification should be aborted prior to the notification. The
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* notification will automatically be torn down after the notification.
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*
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* Input Parameters:
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* key - The key value returned from a previous call to
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* udp_readahead_notifier_setup().
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*
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* Returned Value:
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* Zero (OK) is returned on success; a negated errno value is returned on
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* any failure.
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*
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****************************************************************************/
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int udp_notifier_teardown(int key)
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{
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/* This is just a simple wrapper around work_notifier_teardown(). */
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return work_notifier_teardown(key);
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}
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/****************************************************************************
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* Name: udp_readahead_signal
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*
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* Description:
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* Read-ahead data has been buffered. Notify all threads waiting for
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* read-ahead data to become available.
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*
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* When read-ahead data becomes available, *all* of the workers waiting
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* for read-ahead data will be executed. If there are multiple workers
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* waiting for read-ahead data then only the first to execute will get the
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* data. Others will need to call udp_readahead_notifier_setup() once again.
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*
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* Input Parameters:
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* conn - The UDP connection where read-ahead data was just buffered.
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*
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* Returned Value:
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* None.
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*
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****************************************************************************/
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void udp_readahead_signal(FAR struct udp_conn_s *conn)
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{
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/* This is just a simple wrapper around work_notifier_signal(). */
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work_notifier_signal(WORK_UDP_READAHEAD, conn);
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}
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/****************************************************************************
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* Name: udp_writebuffer_signal
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*
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* Description:
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* All buffer Tx data has been sent. Signal all threads waiting for the
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* write buffers to become empty.
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*
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* When write buffer becomes empty, *all* of the workers waiting
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* for that event data will be executed. If there are multiple workers
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* waiting for read-ahead data then only the first to execute will get the
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* data. Others will need to call tcp_writebuffer_notifier_setup() once
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* again.
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*
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* Input Parameters:
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* conn - The UDP connection where read-ahead data was just buffered.
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*
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* Returned Value:
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* None.
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*
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****************************************************************************/
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#ifdef CONFIG_NET_UDP_WRITE_BUFFERS
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void udp_writebuffer_signal(FAR struct udp_conn_s *conn)
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{
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/* This is just a simple wrapper around work_notifier_signal(). */
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work_notifier_signal(WORK_UDP_WRITEBUFFER, conn);
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}
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#endif
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#endif /* CONFIG_NET_UDP_NOTIFIER */
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