164 lines
4.8 KiB
C
164 lines
4.8 KiB
C
/****************************************************************************
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* net/tcp/tcp_txdrain.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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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/net/net.h>
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#include <nuttx/semaphore.h>
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#include "utils/utils.h"
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#include "tcp/tcp.h"
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#if defined(CONFIG_NET_TCP_WRITE_BUFFERS) && defined(CONFIG_NET_TCP_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: tcp_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 tcp_txdrain(FAR struct socket *psock, unsigned int timeout)
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{
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FAR struct tcp_conn_s *conn;
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sem_t waitsem;
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int ret;
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DEBUGASSERT(psock->s_type == SOCK_STREAM);
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conn = psock->s_conn;
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/* Initialize the wait semaphore */
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nxsem_init(&waitsem, 0, 0);
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/* The following needs to be done with the network stable */
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net_lock();
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/* Get a notification when the write buffers are drained */
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ret = tcp_writebuffer_notifier_setup(txdrain_worker, conn, &waitsem);
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/* The special return value of 0 means that there is no Tx data to be
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* drained. Otherwise it is a special 'key' that can be used to teardown
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* the notification later
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*/
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if (ret > 0)
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{
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/* Save the drain key */
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int drain_key = ret;
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/* Also get a notification if we lose the connection.
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* REVISIT: This really should not be necessary. tcp_send() should
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* detect the disconnection event and signal the txdrain but I do not
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* see that TCP disconnection event. This assures that the txdrain
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* operation will not wait for the full timeout in that case.
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*/
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ret = tcp_disconnect_notifier_setup(txdrain_worker, conn, &waitsem);
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/* Zero is a special value that means that no connection has been
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* established. Otherwise it is a special 'key' that can be used
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* to teardown the notification later
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*/
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if (ret > 0)
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{
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/* Save the disconnect key */
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int disconn_key = ret;
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/* There is pending write data and the socket is connected..
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* wait for it to drain or be be disconnected.
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*/
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ret = net_sem_timedwait_uninterruptible(&waitsem, timeout);
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/* Tear down the disconnect notifier */
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tcp_notifier_teardown(disconn_key);
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}
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/* Tear down the disconnect notifier */
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tcp_notifier_teardown(drain_key);
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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_TCP_WRITE_BUFFERS && CONFIG_NET_TCP_NOTIFIER */
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