1 files changed, 127 insertions, 0 deletions
diff --git a/nuttx/sched/wd_delete.c b/nuttx/sched/wd_delete.c
new file mode 100644
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+++ b/nuttx/sched/wd_delete.c
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+/****************************************************************************
+ * sched/wd_delete.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 <wdog.h>
+#include <queue.h>
+#include <errno.h>
+
+#include <nuttx/arch.h>
+
+#include "wd_internal.h"
+
+/****************************************************************************
+ * Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Type Declarations
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: wd_delete
+ *
+ * Description:  
+ *   The wd_delete function will deallocate a watchdog by returning it to
+ *   the free pool of watchdogs.  The watchdog will be removed from the timer
+ *   queue if has been started.
+ *
+ * Parameters:
+ *   wdId - The watchdog ID to delete.  This is actually a pointer to a
+ *          watchdog structure.
+ *
+ * Return Value:
+ *   Returns OK or ERROR
+ *
+ * Assumptions:
+ *   The caller has assured that the watchdog is no longer in use.
+ *
+ ****************************************************************************/
+
+int wd_delete(WDOG_ID wdId)
+{
+  irqstate_t saved_state;
+
+  /* Verify that a valid watchdog was provided */
+
+  if (!wdId)
+    {
+      set_errno(EINVAL);
+      return ERROR;
+    }
+
+  /* The following steps are atomic... the watchdog must not be active when
+   * it is being deallocated.
+   */
+
+  saved_state = irqsave();
+
+  /* Check if the watchdog has been started. */
+
+  if (wdId->active)
+    {
+      wd_cancel(wdId);
+    }
+
+  /* Put the watchdog back on the free list */
+
+  sq_addlast((FAR sq_entry_t*)wdId, &g_wdfreelist);
+  irqrestore(saved_state);
+
+  /* Return success */
+
+  return OK;
+}