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
2026-10-28 03:53:34 +08:00 · 2012-09-17 18:18:44 +00:00
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+/************************************************************************
+ * sched/wd_initialize.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 <queue.h>
+#include <nuttx/kmalloc.h>
+
+#include "os_internal.h"
+#include "wd_internal.h"
+
+/************************************************************************
+ * Definitions
+ ************************************************************************/
+
+/************************************************************************
+ * Private Type Declarations
+ ************************************************************************/
+
+/************************************************************************
+ * Global Variables
+ ************************************************************************/
+
+/* The g_wdfreelist data structure is a singly linked list of watchdogs
+ * available to the system for delayed function use.
+ */
+
+sq_queue_t g_wdfreelist;
+
+/* g_wdpool is a pointer to a list of pre-allocated watchdogs. The number
+ * of watchdogs in the pool is a configuration item.
+ */
+
+FAR wdog_t *g_wdpool;
+
+/* The g_wdactivelist data structure is a singly linked list ordered by
+ * watchdog expiration time. When watchdog timers expire,the functions on
+ * this linked list are removed and the function is called.
+ */
+
+sq_queue_t g_wdactivelist;
+
+/************************************************************************
+ * Private Variables
+ ************************************************************************/
+
+/************************************************************************
+ * Private Functions
+ ************************************************************************/
+
+/************************************************************************
+ * Public Functions
+ ************************************************************************/
+
+/************************************************************************
+ * Name: wd_initialize
+ *
+ * Description:
+ * This function initalized the watchdog data structures
+ *
+ * Parameters:
+ *   None
+ *
+ * Return Value:
+ *   None
+ *
+ * Assumptions:
+ *   This function must be called early in the initialization sequence
+ *   before the timer interrupt is attached and before any watchdog
+ *   services are used.
+ *
+ ************************************************************************/
+
+void wd_initialize(void)
+{
+  /* Initialize the free watchdog list */
+
+  sq_init(&g_wdfreelist);
+
+  /* The g_wdfreelist must be loaded at initialization time to hold the
+   * configured number of watchdogs.
+   */
+
+  g_wdpool = (FAR wdog_t*)kmalloc(sizeof(wdog_t) * CONFIG_PREALLOC_WDOGS);
+  if (g_wdpool)
+    {
+      FAR wdog_t *wdog = g_wdpool;
+      int i;
+
+      for (i = 0; i < CONFIG_PREALLOC_WDOGS; i++)
+        {
+          sq_addlast((FAR sq_entry_t*)wdog++, &g_wdfreelist);
+        }
+    }
+
+  /* The g_wdactivelist queue must be reset at initialization time. */
+
+  sq_init(&g_wdactivelist);
+}