[rt-smart][fix/lwp] don't restore terminal for background lwp (#6847)

* [fix/lwp] don't restore term for background lwp

components/drivers/include/drivers/serial.h

@@ -25,6 +25,7 @@
 #define BAUD_RATE_115200                115200
 #define BAUD_RATE_230400                230400
 #define BAUD_RATE_460800                460800
+#define BAUD_RATE_500000                500000
 #define BAUD_RATE_921600                921600
 #define BAUD_RATE_2000000               2000000
 #define BAUD_RATE_2500000               2500000

components/drivers/include/drivers/serial_v2.h

@@ -22,6 +22,7 @@
 #define BAUD_RATE_115200                115200
 #define BAUD_RATE_230400                230400
 #define BAUD_RATE_460800                460800
+#define BAUD_RATE_500000                500000
 #define BAUD_RATE_921600                921600
 #define BAUD_RATE_2000000               2000000
 #define BAUD_RATE_2500000               2500000

components/drivers/serial/serial.c

@@ -922,6 +922,7 @@ static const struct speed_baudrate_item _tbl[] =
     {B115200, BAUD_RATE_115200},
     {B230400, BAUD_RATE_230400},
     {B460800, BAUD_RATE_460800},
+    {B500000, BAUD_RATE_500000},
     {B921600, BAUD_RATE_921600},
     {B2000000, BAUD_RATE_2000000},
     {B3000000, BAUD_RATE_3000000},

components/drivers/serial/serial_v2.c

@@ -1024,6 +1024,7 @@ const static struct speed_baudrate_item _tbl[] =
     {B115200, BAUD_RATE_115200},
     {B230400, BAUD_RATE_230400},
     {B460800, BAUD_RATE_460800},
+    {B500000, BAUD_RATE_500000},
     {B921600, BAUD_RATE_921600},
     {B2000000, BAUD_RATE_2000000},
     {B3000000, BAUD_RATE_3000000},

components/lwp/lwp.c

@@ -1282,6 +1282,10 @@ pid_t lwp_execve(char *filename, int debug, int argc, char **argv, char **envp)
 
                 }
             }
+            else
+            {
+                lwp->background = RT_TRUE;
+            }
             thread->lwp = lwp;
 #ifndef ARCH_MM_MMU
             struct lwp_app_head *app_head = (struct lwp_app_head*)lwp->text_entry;

components/lwp/lwp.h

@@ -126,6 +126,7 @@ struct rt_lwp
     struct lwp_avl_struct *address_search_head; /* for addressed object fast rearch */
     char working_directory[DFS_PATH_MAX];
     int debug;
+    int background;
     uint32_t bak_first_ins;
 
 #ifdef LWP_ENABLE_ASID

components/lwp/lwp_pid.c

@@ -445,7 +445,7 @@ void lwp_free(struct rt_lwp* lwp)
     }
 
     rt_hw_interrupt_enable(level);
-    /* for parent */
+    if (!lwp->background)
     {
         struct termios *old_stdin_termios = get_old_termios();
         struct rt_lwp *old_lwp = NULL;
@@ -466,7 +466,10 @@ void lwp_free(struct rt_lwp* lwp)
                 lwp->tty = RT_NULL;
             }
         }
+    }
 
+    /* for parent */
+    {
         if (lwp->parent)
         {
             struct rt_thread *thread;