Resync new repository with old repo r5166

git-svn-id: http://svn.code.sf.net/p/nuttx/code/trunk@5153 42af7a65-404d-4744-a932-0658087f49c3
2026-10-31 07:41:36 +08:00 · 2012-09-17 18:18:44 +00:00
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+/****************************************************************************
+ * net/uip/uip_igmpmgs.c
+ *
+ *   Copyright (C) 2010-2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * The NuttX implementation of IGMP was inspired by the IGMP add-on for the
+ * lwIP TCP/IP stack by Steve Reynolds:
+ *
+ *   Copyright (c) 2002 CITEL Technologies Ltd.
+ *   All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without 
+ * modification, are permitted provided that the following conditions 
+ * are met: 
+ *
+ * 1. Redistributions of source code must retain the above copyright 
+ *    notice, this list of conditions and the following disclaimer. 
+ * 2. Redistributions in binary form must reproduce the above copyright 
+ *    notice, this list of conditions and the following disclaimer in the 
+ *    documentation and/or other materials provided with the distribution. 
+ * 3. Neither the name of CITEL Technologies Ltd nor the names of its contributors 
+ *    may be used to endorse or promote products derived from this software 
+ *    without specific prior written permission. 
+ *
+ * THIS SOFTWARE IS PROVIDED BY CITEL TECHNOLOGIES AND CONTRIBUTORS ``AS IS''
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 
+ * ARE DISCLAIMED.  IN NO EVENT SHALL CITEL TECHNOLOGIES OR CONTRIBUTORS BE LIABLE 
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 
+ * SUCH DAMAGE. 
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <assert.h>
+#include <debug.h>
+
+#include <nuttx/net/uip/uipopt.h>
+#include <nuttx/net/uip/uip.h>
+#include <nuttx/net/uip/uip-igmp.h>
+
+#include "uip_internal.h"
+
+#ifdef CONFIG_NET_IGMP
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: uip_igmpschedmsg
+ *
+ * Description:
+ *   Schedule a message to be send at the next driver polling interval.
+ *
+ * Assumptions:
+ *   This function may be called in most any context.
+ *
+ ****************************************************************************/
+
+void uip_igmpschedmsg(FAR struct igmp_group_s *group, uint8_t msgid)
+{
+  uip_lock_t flags;
+
+  /* The following should be atomic */
+
+  flags = uip_lock();
+  DEBUGASSERT(!IS_SCHEDMSG(group->flags));
+  group->msgid = msgid;
+  SET_SCHEDMSG(group->flags);
+  uip_unlock(flags);
+}
+
+/****************************************************************************
+ * Name: uip_igmpwaitmsg
+ *
+ * Description:
+ *   Schedule a message to be send at the next driver polling interval and
+ *   block, waiting for the message to be sent.
+ *
+ * Assumptions:
+ *   This function cannot be called from an interrupt handler (if you try it,
+ *   uip_lockedwait will assert).
+ *
+ ****************************************************************************/
+
+void uip_igmpwaitmsg(FAR struct igmp_group_s *group, uint8_t msgid)
+{
+  uip_lock_t flags;
+
+  /* Schedule to send the message */
+
+  flags = uip_lock();
+  DEBUGASSERT(!IS_WAITMSG(group->flags));
+  SET_WAITMSG(group->flags);
+  uip_igmpschedmsg(group, msgid);
+
+  /* Then wait for the message to be sent */
+
+  while (IS_SCHEDMSG(group->flags))
+    {
+      /* Wait for the semaphore to be posted */
+
+      while (uip_lockedwait(&group->sem) != 0)
+        {
+          /* The only error that should occur from uip_lockedwait() is if
+           * the wait is awakened by a signal.
+           */
+ 
+          ASSERT(errno == EINTR);
+        }
+    }
+
+  /* The message has been sent and we are no longer waiting */
+
+  CLR_WAITMSG(group->flags);
+  uip_unlock(flags);
+}
+
+#endif /* CONFIG_NET_IGMP */