add rt_tick_set function

git-svn-id: https://rt-thread.googlecode.com/svn/trunk@1551 bbd45198-f89e-11dd-88c7-29a3b14d5316

include/rtthread.h

@@ -63,6 +63,7 @@ void rt_object_put_sethook(void (*hook)(struct rt_object* object));
  */
 void rt_system_tick_init(void);
 rt_tick_t rt_tick_get(void);
+void rt_tick_set(rt_tick_t tick);
 void rt_tick_increase(void);
 rt_tick_t rt_tick_from_millisecond(rt_uint32_t ms);
 

src/clock.c

@@ -15,8 +15,10 @@
  * 2010-03-08     Bernard      remove rt_passed_second
  * 2010-05-20     Bernard      fix the tick exceeds the maximum limits
  * 2010-07-13     Bernard      fix rt_tick_from_millisecond issue found by kuronca
+ * 2011-06-26     Bernard      add rt_tick_set function.
  */
 
+#include <rthw.h>
 #include <rtthread.h>
 
 static rt_tick_t rt_tick;
@@ -51,6 +53,19 @@ rt_tick_t rt_tick_get()
 	return rt_tick;
 }
 
+/**
+ * This function will set current tick
+ */
+void rt_tick_set(rt_tick_t tick)
+{
+	rt_base_t level;
+	level = rt_hw_interrupt_disable();
+
+	rt_tick = tick;
+	
+	rt_hw_interrupt_enable(level);
+}
+
 /**
  * This function will notify kernel there is one tick passed. Normally,
  * this function is invoked by clock ISR.

src/kservice.c

@@ -44,7 +44,11 @@ rt_err_t rt_get_errno(void)
 {
 	rt_thread_t tid;
 
-	RT_DEBUG_NOT_IN_INTERRUPT;
+	if(rt_interrupt_get_nest() != 0)
+	{
+		/* it's in interrupt context */
+		return errno;
+	}
 
 	tid = rt_thread_self();
 	if (tid == RT_NULL) return errno;
@@ -61,7 +65,12 @@ void rt_set_errno(rt_err_t error)
 {
 	rt_thread_t tid;
 
-	RT_DEBUG_NOT_IN_INTERRUPT;
+	if(rt_interrupt_get_nest() != 0)
+	{
+		/* it's in interrupt context */
+		errno = error;
+		return;
+	}
 
 	tid = rt_thread_self();
 	if (tid == RT_NULL) { errno = error; return; }