sched/task: add kernel interface nxsched_* gettid/getpid/getppid

add new interface to implement getpid()/gettid()/getppid() for kernel version.

Signed-off-by: chao an <anchao@xiaomi.com>

include/nuttx/sched.h

@@ -166,6 +166,16 @@
 #  define _SCHED_ERRVAL(r)           (-errno)
 #endif
 
+#if defined(CONFIG_BUILD_FLAT) || defined(__KERNEL__)
+#  define _SCHED_GETTID()            nxsched_gettid()
+#  define _SCHED_GETPID()            nxsched_getpid()
+#  define _SCHED_GETPPID()           nxsched_getppid()
+#else
+#  define _SCHED_GETTID()            gettid()
+#  define _SCHED_GETPID()            getpid()
+#  define _SCHED_GETPPID()           getppid()
+#endif
+
 #ifdef CONFIG_DEBUG_TCBINFO
 #  define TCB_PID_OFF                offsetof(struct tcb_s, pid)
 #  define TCB_STATE_OFF              offsetof(struct tcb_s, task_state)
@@ -1408,6 +1418,67 @@ int nxsched_get_stackinfo(pid_t pid, FAR struct stackinfo_s *stackinfo);
 pid_t nxsched_waitpid(pid_t pid, FAR int *stat_loc, int options);
 #endif
 
+/****************************************************************************
+ * Name: nxsched_gettid
+ *
+ * Description:
+ *   Get the thread ID of the currently executing thread.
+ *
+ * Input parameters:
+ *   None
+ *
+ * Returned Value:
+ *   On success, returns the thread ID of the calling process.
+ *
+ ****************************************************************************/
+
+pid_t nxsched_gettid(void);
+
+/****************************************************************************
+ * Name: nxsched_getpid
+ *
+ * Description:
+ *   Get the Process ID of the currently executing task.
+ *
+ * Input parameters:
+ *   None
+ *
+ * Returned Value:
+ *   Normally when called from user applications, nxsched_getpid() will
+ *   return the Process ID of the currently executing task. that is,
+ *   the main task for the task groups. There is no specification for
+ *   any errors returned from nxsched_getpid().
+ *
+ ****************************************************************************/
+
+pid_t nxsched_getpid(void);
+
+/****************************************************************************
+ * Name: nxsched_getppid
+ *
+ * Description:
+ *   Get the parent task ID of the currently executing task.
+ *
+ * Input parameters:
+ *   None
+ *
+ * Returned Value:
+ *   Normally when called from user applications, nxsched_getppid() will
+ *   return the parent task ID of the currently executing task, that is,
+ *   the task at the head of the ready-to-run list.
+ *   There is no specification for any errors returned from
+ *   nxsched_getppid().
+ *
+ *   nxsched_getppid(), however, may be called from within the OS in some
+ *   cases. There are certain situations during context switching when the
+ *   OS data structures are in flux and where the current task at the head
+ *   of the ready-to-run task list is not actually running.
+ *   In that case, nxsched_getppid() will return the error: -ESRCH
+ *
+ ****************************************************************************/
+
+pid_t nxsched_getppid(void);
+
 #undef EXTERN
 #if defined(__cplusplus)
 }

sched/task/task_getpid.c

@@ -35,7 +35,7 @@
  ****************************************************************************/
 
 /****************************************************************************
- * Name: getpid
+ * Name: nxsched_getpid
  *
  * Description:
  *   Get the Process ID of the currently executing task.
@@ -44,14 +44,14 @@
  *   None
  *
  * Returned Value:
- *   Normally when called from user applications, getpid() will return the
- *   Process ID of the currently executing task. that is, the main task
- *   for the task groups. There is no specification for any errors
- *   returned from getpid().
+ *   Normally when called from user applications, nxsched_getpid() will
+ *   return the Process ID of the currently executing task. that is,
+ *   the main task for the task groups. There is no specification for
+ *   any errors returned from nxsched_getpid().
  *
  ****************************************************************************/
 
-pid_t getpid(void)
+pid_t nxsched_getpid(void)
 {
   FAR struct tcb_s *rtcb;
 
@@ -78,3 +78,25 @@ pid_t getpid(void)
 
   return IDLE_PROCESS_ID;
 }
+
+/****************************************************************************
+ * Name: getpid
+ *
+ * Description:
+ *   Get the Process ID of the currently executing task.
+ *
+ * Input parameters:
+ *   None
+ *
+ * Returned Value:
+ *   Normally when called from user applications, getpid() will return the
+ *   Process ID of the currently executing task. that is, the main task
+ *   for the task groups. There is no specification for any errors
+ *   returned from getpid().
+ *
+ ****************************************************************************/
+
+pid_t getpid(void)
+{
+  return nxsched_getpid();
+}

sched/task/task_getppid.c

@@ -35,7 +35,7 @@
  ****************************************************************************/
 
 /****************************************************************************
- * Name: getppid
+ * Name: nxsched_getppid
  *
  * Description:
  *   Get the parent task ID of the currently executing task.
@@ -44,20 +44,21 @@
  *   None
  *
  * Returned Value:
- *   Normally when called from user applications, getppid() will return the
- *   parent task ID of the currently executing task, that is, the task at the
- *   head of the ready-to-run list.  There is no specification for any errors
- *   returned from getppid().
+ *   Normally when called from user applications, nxsched_getppid() will
+ *   return the parent task ID of the currently executing task, that is,
+ *   the task at the head of the ready-to-run list.
+ *   There is no specification for any errors returned from
+ *   nxsched_getppid().
  *
- *   getppid(), however, may be called from within the OS in some cases.
- *   There are certain situations during context switching when the OS data
- *   structures are in flux and where the current task at the head of the
- *   ready-to-run task list is not actually running.  In that case,
- *   getppid() will return the error: -ESRCH
+ *   nxsched_getppid(), however, may be called from within the OS in some
+ *   cases. There are certain situations during context switching when the
+ *   OS data structures are in flux and where the current task at the head
+ *   of the ready-to-run task list is not actually running.
+ *   In that case, nxsched_getppid() will return the error: -ESRCH
  *
  ****************************************************************************/
 
-pid_t getppid(void)
+pid_t nxsched_getppid(void)
 {
   FAR struct tcb_s *rtcb;
 
@@ -98,3 +99,31 @@ pid_t getppid(void)
 
   return IDLE_PROCESS_ID;
 }
+
+/****************************************************************************
+ * Name: getppid
+ *
+ * Description:
+ *   Get the parent task ID of the currently executing task.
+ *
+ * Input parameters:
+ *   None
+ *
+ * Returned Value:
+ *   Normally when called from user applications, getppid() will return the
+ *   parent task ID of the currently executing task, that is, the task at the
+ *   head of the ready-to-run list.  There is no specification for any errors
+ *   returned from getppid().
+ *
+ *   getppid(), however, may be called from within the OS in some cases.
+ *   There are certain situations during context switching when the OS data
+ *   structures are in flux and where the current task at the head of the
+ *   ready-to-run task list is not actually running.  In that case,
+ *   getppid() will return the error: -ESRCH
+ *
+ ****************************************************************************/
+
+pid_t getppid(void)
+{
+  return nxsched_getppid();
+}

sched/task/task_gettid.c

@@ -35,7 +35,7 @@
  ****************************************************************************/
 
 /****************************************************************************
- * Name: gettid
+ * Name: nxsched_gettid
  *
  * Description:
  *   Get the thread ID of the currently executing thread.
@@ -48,7 +48,7 @@
  *
  ****************************************************************************/
 
-pid_t gettid(void)
+pid_t nxsched_gettid(void)
 {
   FAR struct tcb_s *rtcb;
 
@@ -89,3 +89,22 @@ pid_t gettid(void)
 
   return 0;
 }
+
+/****************************************************************************
+ * Name: gettid
+ *
+ * Description:
+ *   Get the thread ID of the currently executing thread.
+ *
+ * Input parameters:
+ *   None
+ *
+ * Returned Value:
+ *   On success, returns the thread ID of the calling process.
+ *
+ ****************************************************************************/
+
+pid_t gettid(void)
+{
+  return nxsched_gettid();
+}