141 lines
4.7 KiB
C
141 lines
4.7 KiB
C
/****************************************************************************
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* net/igmp/igmp_msg.c
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*
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* Copyright (C) 2010-2011 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* The NuttX implementation of IGMP was inspired by the IGMP add-on for the
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* lwIP TCP/IP stack by Steve Reynolds:
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*
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* Copyright (c) 2002 CITEL Technologies Ltd.
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* All rights reserved.
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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 the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of CITEL Technologies Ltd nor the names of its contributors
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* may be 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 CITEL TECHNOLOGIES AND CONTRIBUTORS ``AS IS''
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL CITEL TECHNOLOGIES OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* 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 <assert.h>
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#include <debug.h>
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#include <nuttx/net/netconfig.h>
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#include <nuttx/net/net.h>
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#include <nuttx/net/igmp.h>
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#include "devif/devif.h"
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#include "igmp/igmp.h"
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#ifdef CONFIG_NET_IGMP
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/****************************************************************************
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* Private Functions
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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: igmp_schedmsg
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*
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* Description:
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* Schedule a message to be send at the next driver polling interval.
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*
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* Assumptions:
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* This function may be called in most any context.
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*
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****************************************************************************/
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void igmp_schedmsg(FAR struct igmp_group_s *group, uint8_t msgid)
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{
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net_lock_t flags;
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/* The following should be atomic */
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flags = net_lock();
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DEBUGASSERT(!IS_SCHEDMSG(group->flags));
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group->msgid = msgid;
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SET_SCHEDMSG(group->flags);
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net_unlock(flags);
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}
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/****************************************************************************
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* Name: igmp_waitmsg
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*
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* Description:
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* Schedule a message to be send at the next driver polling interval and
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* block, waiting for the message to be sent.
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*
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* Assumptions:
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* This function cannot be called from an interrupt handler (if you try it,
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* net_lockedwait will assert).
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*
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****************************************************************************/
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void igmp_waitmsg(FAR struct igmp_group_s *group, uint8_t msgid)
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{
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net_lock_t flags;
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/* Schedule to send the message */
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flags = net_lock();
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DEBUGASSERT(!IS_WAITMSG(group->flags));
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SET_WAITMSG(group->flags);
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igmp_schedmsg(group, msgid);
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/* Then wait for the message to be sent */
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while (IS_SCHEDMSG(group->flags))
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{
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/* Wait for the semaphore to be posted */
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while (net_lockedwait(&group->sem) != 0)
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{
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/* The only error that should occur from net_lockedwait() is if
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* the wait is awakened by a signal.
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*/
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ASSERT(get_errno() == EINTR);
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}
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}
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/* The message has been sent and we are no longer waiting */
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CLR_WAITMSG(group->flags);
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net_unlock(flags);
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}
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#endif /* CONFIG_NET_IGMP */
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