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139 lines
4.7 KiB
139 lines
4.7 KiB
/**************************************************************************** |
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* net/uip/uip_igmpmgs.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/uip/uipopt.h> |
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#include <nuttx/net/uip/uip.h> |
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#include <nuttx/net/uip/uip-igmp.h> |
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#include "uip_internal.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: uip_igmpschedmsg |
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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 uip_igmpschedmsg(FAR struct igmp_group_s *group, uint8_t msgid) |
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{ |
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uip_lock_t flags; |
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/* The following should be atomic */ |
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flags = uip_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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uip_unlock(flags); |
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} |
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/**************************************************************************** |
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* Name: uip_igmpwaitmsg |
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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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* uip_lockedwait will assert). |
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* |
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****************************************************************************/ |
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void uip_igmpwaitmsg(FAR struct igmp_group_s *group, uint8_t msgid) |
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{ |
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uip_lock_t flags; |
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/* Schedule to send the message */ |
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flags = uip_lock(); |
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DEBUGASSERT(!IS_WAITMSG(group->flags)); |
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SET_WAITMSG(group->flags); |
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uip_igmpschedmsg(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 (uip_lockedwait(&group->sem) != 0) |
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{ |
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/* The only error that should occur from uip_lockedwait() is if |
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* the wait is awakened by a signal. |
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*/ |
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ASSERT(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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uip_unlock(flags); |
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} |
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#endif /* CONFIG_NET_IGMP */
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