1 files changed, 112 insertions, 0 deletions
diff --git a/src/idle.c b/src/idle.c
new file mode 100644
index 0000000000..f7da5e2c81
--- /dev/null
+++ b/src/idle.c
@@ -0,0 +1,112 @@
+/*
+ * File      : idle.c
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2006, RT-Thread Development Team
+ *
+ * The license and distribution terms for this file may be
+ * found in the file LICENSE in this distribution or at
+ * http://openlab.rt-thread.com/license/LICENSE
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2006-03-23     Bernard      the first version
+ */
+
+#include <rthw.h>
+#include <rtthread.h>
+#include "kservice.h"
+
+#if defined (RT_USING_HOOK) || defined(RT_USING_HEAP)
+#define IDLE_THREAD_STACK_SIZE	256
+#else
+#define IDLE_THREAD_STACK_SIZE	128
+#endif
+
+static struct rt_thread idle;
+static rt_uint8_t rt_thread_stack[IDLE_THREAD_STACK_SIZE];
+
+#ifdef RT_USING_HEAP
+extern rt_list_t rt_thread_defunct;
+#endif
+
+#ifdef RT_USING_HOOK
+/**
+ * @addtogroup Hook
+ */
+/*@{*/
+
+static void (*rt_thread_idle_hook)();
+
+/**
+ * This function will set a hook function to idle thread loop.
+ *
+ * @param hook the specified hook function
+ *
+ * @note the hook function must be simple and never be blocked or suspend.
+ */
+void rt_thread_idle_sethook(void (*hook)())
+{
+	rt_thread_idle_hook = hook;
+}
+/*@}*/
+#endif
+
+static void rt_thread_idle_entry(void* parameter)
+{
+	while (1)
+	{
+#ifdef RT_USING_HOOK
+		/* if there is an idle thread hook */
+		if (rt_thread_idle_hook != RT_NULL) rt_thread_idle_hook();
+#endif
+
+#ifdef RT_USING_HEAP
+		/* check the defunct thread list */
+		if (!rt_list_isempty(&rt_thread_defunct))
+		{
+			rt_base_t lock;
+
+			struct rt_thread* thread = rt_list_entry(rt_thread_defunct.next, struct rt_thread, tlist);
+
+			/* disable interrupt */
+			lock = rt_hw_interrupt_disable();
+
+			rt_list_remove(&(thread->tlist));
+
+			/* enable interrupt */
+			rt_hw_interrupt_enable(lock);
+
+			/* release thread's stack */
+			rt_free(thread->stack_addr);
+
+			/* delete thread object */
+			rt_object_delete((rt_object_t)thread);
+		}
+#endif
+	}
+}
+
+/**
+ * @addtogroup SystemInit
+ */
+/*@{*/
+
+/**
+ * This function will initialize idle thread, then start it.
+ *
+ * @note this function must be invoked when system init.
+ */
+void rt_thread_idle_init()
+{
+	/* init thread */
+	rt_thread_init(&idle,
+		"tidle",
+		rt_thread_idle_entry, RT_NULL,
+		&rt_thread_stack[0], sizeof(rt_thread_stack),
+		RT_THREAD_PRIORITY_MAX - 1, 32);
+
+	/* startup */
+	rt_thread_startup(&idle);
+}
+
+/*@}*/