clean up software timer code.

git-svn-id: https://rt-thread.googlecode.com/svn/trunk@222 bbd45198-f89e-11dd-88c7-29a3b14d5316

src/ipc.c

@@ -107,6 +107,10 @@ rt_inline rt_err_t rt_ipc_object_suspend(struct rt_ipc_object *ipc, struct rt_th
 					break;
 				}
 			}
+
+			/* not found a suitable position, append to the end of suspend_thread list */
+			if (n == &(ipc->suspend_thread))
+				rt_list_insert_before(&(ipc->suspend_thread), &(thread->tlist));
 		}
 		break;
 	}

src/timer.c

@@ -344,7 +344,7 @@ rt_err_t rt_timer_control(rt_timer_t timer, rt_uint8_t cmd, void* arg)
  *
  */
 #ifdef RT_USING_TIMER_SOFT
-void  rt_soft_timer_tick_hook (void);
+void  rt_soft_timer_tick_increase (void);
 #endif
 void rt_timer_check()
 {
@@ -405,9 +405,9 @@ void rt_timer_check()
 	/* enable interrupt */
 	rt_hw_interrupt_enable(level);
 
-	/**/
+	/* increase soft timer tick */
 #ifdef RT_USING_TIMER_SOFT
-	rt_soft_timer_tick_hook ( );
+	rt_soft_timer_tick_increase ( );
 #endif
 
 #ifdef TIMER_DEBUG
@@ -422,19 +422,13 @@ static struct rt_semaphore timer_sem;
 
 static  rt_uint16_t  timer_ex_cnt;
 
-
-rt_err_t timer_signal (void)
-{
-	return	rt_sem_release(&timer_sem);
-}
-
-void  rt_soft_timer_tick_hook (void)
+void  rt_soft_timer_tick_increase (void)
 {
 	timer_ex_cnt++;
 	if (timer_ex_cnt >= (RT_TICK_PER_SECOND / RT_TIMER_EX_TICKS_PER_SEC)) 
 	{
 		timer_ex_cnt = 0;
-		timer_signal();
+		rt_sem_release(&timer_sem);
 	}
 }
 
@@ -505,10 +499,9 @@ static void rt_thread_timer_entry(void* parameter)
 {
 	while (1)
 	{
-	
+		/* take software timer semaphore */
 		rt_sem_take(&timer_sem,RT_WAITING_FOREVER);
 
-	
         /* lock scheduler */
 		rt_enter_critical();
 
@@ -534,7 +527,18 @@ void rt_system_timer_init()
 #ifdef RT_USING_TIMER_SOFT
 	rt_list_init(&rt_soft_timer_list);
     rt_sem_init(&timer_sem, "timer", 0, RT_IPC_FLAG_FIFO);
+#endif
+}
 
+/**
+ * @ingroup SystemInit
+ *
+ * This function will init system timer thread
+ *
+ */
+void rt_system_timer_thread_init()
+{
+#ifdef RT_USING_TIMER_SOFT
     /* start software timer thread */
 	rt_thread_init(&timer_thread,
 				   "timer",