score: Add stack free handler to TCB

This avoids a dependency to the stack free function in the thread
destruction.

Update #3959.

3 files changed, 13 insertions, 5 deletions

diff --git a/cpukit/include/rtems/score/stackimpl.h b/cpukit/include/rtems/score/stackimpl.h
index 305c4e4e51..df9f87d5a3 100644
--- a/cpukit/include/rtems/score/stackimpl.h
+++ b/cpukit/include/rtems/score/stackimpl.h
@@ -166,6 +166,13 @@ void *_Stack_Allocate( size_t stack_size );
  */
 void _Stack_Free( void *stack_area );
 
+/**
+ * @brief This function does nothing.
+ *
+ * @param stack_area is not used.
+ */
+void _Stack_Free_nothing( void *stack_area );
+
 /** @} */
 
 #ifdef __cplusplus
diff --git a/cpukit/include/rtems/score/thread.h b/cpukit/include/rtems/score/thread.h
index ee0aee5b79..1daf6143f9 100644
--- a/cpukit/include/rtems/score/thread.h
+++ b/cpukit/include/rtems/score/thread.h
@@ -194,10 +194,9 @@ typedef struct {
   /** This field is the initial priority. */
   Priority_Control                     initial_priority;
   /**
-   * @brief This field is a pointer to the allocated stack area, otherwise it
-   * is NULL.
+   * @brief This field points to the handler which should free the stack.
    */
-  void                                *allocated_stack;
+  void                              ( *stack_free )( void * );
   /** This field is the stack information. */
   Stack_Control                        Initial_stack;
   #if ( CPU_HARDWARE_FP == TRUE ) || ( CPU_SOFTWARE_FP == TRUE )
diff --git a/cpukit/include/rtems/score/threadimpl.h b/cpukit/include/rtems/score/threadimpl.h
index 0b69caf962..61454eb7fe 100644
--- a/cpukit/include/rtems/score/threadimpl.h
+++ b/cpukit/include/rtems/score/threadimpl.h
@@ -144,9 +144,11 @@ typedef struct {
   size_t stack_size;
 
   /**
-   * @brief The address of the allocated stack area or NULL.
+   * @brief This member contains the handler to free the stack.
+   *
+   * It shall not be NULL.  Use _Stack_Free_nothing() if nothing is to free.
    */
-  void *allocated_stack;
+  void ( *stack_free )( void * );
 
   /**
    * @brief The new thread's priority.