From 6e9303ee9cf662dc26a9aa0b6f3a8e2d0af6695b Mon Sep 17 00:00:00 2001
From: gdisirio <gdisirio@35acf78f-673a-0410-8e92-d51de3d6d3f4>
Date: Wed, 30 Oct 2013 13:14:36 +0000
Subject: Improved time range check in the kernel.

git-svn-id: svn://svn.code.sf.net/p/chibios/svn/trunk@6401 35acf78f-673a-0410-8e92-d51de3d6d3f4
---
 os/kernel/include/chvt.h | 27 ++++++++++++++++++++++++++-
 1 file changed, 26 insertions(+), 1 deletion(-)

(limited to 'os/kernel/include/chvt.h')

diff --git a/os/kernel/include/chvt.h b/os/kernel/include/chvt.h
index c677689af..c1b246cd3 100644
--- a/os/kernel/include/chvt.h
+++ b/os/kernel/include/chvt.h
@@ -207,6 +207,32 @@ typedef struct {
  * @api
  */
 #define chTimeNow() (vtlist.vt_systime)
+
+/**
+ * @brief   Returns the elapsed time since the specified start time.
+ *
+ * @param[in] start     start time
+ * @return              The elapsed time.
+ *
+ * @api
+ */
+#define chTimeElapsedSince(start) (chTimeNow() - (start))
+
+/**
+ * @brief   Checks if the current system time is within the specified time
+ *          window.
+ * @note    When start==end then the function returns always true because the
+ *          whole time range is specified.
+ *
+ * @param[in] start     the start of the time window (inclusive)
+ * @param[in] end       the end of the time window (non inclusive)
+ * @retval TRUE         current time within the specified time window.
+ * @retval FALSE        current time not within the specified time window.
+ *
+ * @api
+ */
+#define chTimeIsWithin(start, end)                                          \
+  (chTimeElapsedSince(start) < ((end) - (start)))
 /** @} */
 
 extern VTList vtlist;
@@ -220,7 +246,6 @@ extern "C" {
   void _vt_init(void);
   void chVTSetI(VirtualTimer *vtp, systime_t time, vtfunc_t vtfunc, void *par);
   void chVTResetI(VirtualTimer *vtp);
-  bool_t chTimeIsWithin(systime_t start, systime_t end);
 #ifdef __cplusplus
 }
 #endif
-- 
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