1 files changed, 146 insertions, 0 deletions
diff --git a/nuttx/sched/mq_unlink.c b/nuttx/sched/mq_unlink.c
new file mode 100644
index 000000000..1fa25dfa8
--- /dev/null
+++ b/nuttx/sched/mq_unlink.c
@@ -0,0 +1,146 @@
+/************************************************************************
+ * sched.mq_unlink.c
+ *
+ *   Copyright (C) 2007, 2009 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * 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 NuttX 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 THE COPYRIGHT HOLDERS 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 THE
+ * COPYRIGHT OWNER 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 <stdbool.h>
+#include <mqueue.h>
+#include <sched.h>
+
+#include "os_internal.h"
+#include "mq_internal.h"
+
+/************************************************************************
+ * Pre-processor Definitions
+ ************************************************************************/
+
+/************************************************************************
+ * Private Type Declarations
+ ************************************************************************/
+
+/************************************************************************
+ * Global Variables
+ ************************************************************************/
+
+/************************************************************************
+ * Private Variables
+ ************************************************************************/
+
+/************************************************************************
+ * Private Functions
+ ************************************************************************/
+
+/************************************************************************
+ * Public Functions
+ ************************************************************************/
+
+/************************************************************************
+ * Name: mq_unlink
+ *
+ * Description:
+ *   This function removes the message queue named by "mq_name." If one
+ *   or more tasks have the message queue open when mq_unlink() is called,
+ *   removal of the message queue is postponed until all references to the
+ *   message queue have been closed.
+ * 
+ * Parameters:
+ *   mq_name - Name of the message queue
+ *
+ * Return Value:
+ *   None
+ *
+ * Assumptions:
+ *
+ ************************************************************************/
+
+int mq_unlink(const char *mq_name)
+{
+  FAR msgq_t *msgq;
+  irqstate_t  saved_state;
+  int         ret = ERROR;
+
+  /* Verify the input values */
+
+  if (mq_name)
+    {
+      sched_lock();
+
+      /* Find the named message queue */
+
+      msgq = mq_findnamed(mq_name);
+      if (msgq)
+        {
+          /* If it is no longer connected, then we can just
+           * discard the message queue now.
+           */
+
+          if (!msgq->nconnect)
+            {
+              /* Remove the message queue from the list of all
+               * message queues
+               */
+
+              saved_state = irqsave();
+              (void)sq_rem((FAR sq_entry_t*)msgq, &g_msgqueues);
+              irqrestore(saved_state);
+
+              /* Then deallocate it (and any messages left in it) */
+
+              mq_msgqfree(msgq);
+            }
+
+          /* If the message queue is still connected to a message descriptor,
+           * then mark it for deletion when the last message descriptor is
+           * closed
+           */
+
+          else
+            {
+              msgq->unlinked = true;
+            }
+
+          ret = OK;
+        }
+
+      sched_unlock();
+    }
+
+  return ret;
+}
+