Added support for POSIX timers

git-svn-id: https://nuttx.svn.sourceforge.net/svnroot/nuttx/trunk@111 7fd9a85b-ad96-42d3-883c-3090e2eb8679

1 files changed, 116 insertions, 0 deletions

diff --git a/nuttx/sched/wd_gettime.c b/nuttx/sched/wd_gettime.c
new file mode 100644
index 0000000000..77d71eb5ce
--- /dev/null
+++ b/nuttx/sched/wd_gettime.c
@@ -0,0 +1,116 @@
+/********************************************************************************
+ * wd_gettime.c
+ *
+ *   Copyright (C) 2007 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
+ *
+ * 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 Gregory Nutt 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 <sys/types.h>
+#include <wdog.h>
+#include "os_internal.h"
+#include "wd_internal.h"
+
+/********************************************************************************
+ * Definitions
+ ********************************************************************************/
+
+/********************************************************************************
+ * Private Types
+ ********************************************************************************/
+
+/********************************************************************************
+ * Global Variables
+ ********************************************************************************/
+
+/********************************************************************************
+ * Private Variables
+ ********************************************************************************/
+
+/********************************************************************************
+ * Private Functions
+ ********************************************************************************/
+
+/********************************************************************************
+ * Public Functions
+ ********************************************************************************/
+
+/********************************************************************************
+ * Function:  wd_gettime
+ *
+ * Description:
+ *   This function returns the time remaining before the the specified watchdog
+ *   expires.
+ *
+ * Parameters:
+ *   wdog = watchdog ID
+ *
+ * Return Value:
+ *   The time in system ticks remaining until the watchdog time expires.  Zero
+ *   means either that wdog is not valid or that the wdog has already expired.
+ *
+ * Assumptions:
+ *
+ ********************************************************************************/
+
+int wd_gettime(WDOG_ID wdog)
+{
+  irqstate_t flags;
+
+  /* Verify the wdog */
+
+  flags = irqsave();
+  if (wdog && wdog->active)
+    {
+      /* Traverse the watchdog list accumulating lag times until we find the wdog
+       * that we are looking for
+       */
+
+      wdog_t *curr;
+      int delay = 0;
+
+      for (curr = (wdog_t*)g_wdactivelist.head; curr; curr = curr->next)
+        {
+          delay += curr->lag;
+          if (curr == wdog)
+            {
+              irqrestore(flags);
+              return delay;
+            }
+        }
+    }
+
+  irqrestore(flags);
+  return 0;
+}