144 lines
4.6 KiB
C
144 lines
4.6 KiB
C
/****************************************************************************
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* net/udp/udp_txdrain.c
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*
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* Copyright (C) 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 <sched.h>
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#include <assert.h>
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#include <errno.h>
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#include <nuttx/semaphore.h>
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#include "udp/udp.h"
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#if defined(CONFIG_NET_UDP_WRITE_BUFFERS) && defined(CONFIG_NET_UDP_NOTIFIER)
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: txdrain_worker
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*
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* Description:
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* Called with the write buffers have all been sent.
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*
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* Input Parameters:
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* arg - The notifier entry.
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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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static void txdrain_worker(FAR void *arg)
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{
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FAR sem_t *waitsem = (FAR sem_t *)arg;
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DEBUGASSERT(waitsem != NULL);
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/* Then just post the semaphore, waking up tcp_txdrain() */
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nxsem_post(waitsem);
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}
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: udp_txdrain
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*
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* Description:
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* Wait for all write buffers to be sent (or for a timeout to occur).
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*
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* Input Parameters:
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* psock - An instance of the internal socket structure.
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* timeout - The relative time when the timeout will occur
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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
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* on any failure.
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*
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****************************************************************************/
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int udp_txdrain(FAR struct socket *psock, unsigned int timeout)
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{
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FAR struct udp_conn_s *conn;
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sem_t waitsem;
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int ret;
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DEBUGASSERT(psock != NULL && psock->s_crefs > 0 && psock->s_conn != NULL);
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DEBUGASSERT(psock->s_type == SOCK_DGRAM);
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conn = (FAR struct udp_conn_s *)psock->s_conn;
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/* Initialize the wait semaphore */
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nxsem_init(&waitsem, 0, 0);
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nxsem_setprotocol(&waitsem, SEM_PRIO_NONE);
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/* The following needs to be done with the network stable */
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net_lock();
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ret = udp_writebuffer_notifier_setup(txdrain_worker, conn, &waitsem);
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if (ret > 0)
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{
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int key = ret;
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/* There is pending write data.. wait for it to drain. */
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ret = net_timedwait_uninterruptible(&waitsem, timeout);
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/* Tear down the notifier (in case we timed out or were canceled) */
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if (ret < 0)
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{
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udp_notifier_teardown(key);
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}
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}
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net_unlock();
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nxsem_destroy(&waitsem);
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return ret;
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}
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#endif /* CONFIG_NET_UDP_WRITE_BUFFERS && CONFIG_NET_UDP_NOTIFIER */
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