diff options
Diffstat (limited to 'cpukit/score/include/rtems/score/scheduler.h')
-rw-r--r-- | cpukit/score/include/rtems/score/scheduler.h | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/cpukit/score/include/rtems/score/scheduler.h b/cpukit/score/include/rtems/score/scheduler.h index 993ae55b29..8da988fffd 100644 --- a/cpukit/score/include/rtems/score/scheduler.h +++ b/cpukit/score/include/rtems/score/scheduler.h @@ -90,6 +90,31 @@ typedef struct { bool ); +#if defined(RTEMS_SMP) + /** + * Ask for help operation. + * + * @param[in] scheduler The scheduler of the thread offering help. + * @param[in] offers_help The thread offering help. + * @param[in] needs_help The thread needing help. + * + * @retval needs_help It was not possible to schedule the thread needing + * help, so it is returned to continue the search for help. + * @retval next_needs_help It was possible to schedule the thread needing + * help, but this displaced another thread eligible to ask for help. So + * this thread is returned to start a new search for help. + * @retval NULL It was possible to schedule the thread needing help, and no + * other thread needs help as a result. + * + * @see _Scheduler_Ask_for_help(). + */ + Thread_Control *( *ask_for_help )( + const Scheduler_Control *scheduler, + Thread_Control *offers_help, + Thread_Control *needs_help + ); +#endif + /** @see _Scheduler_Node_initialize() */ void ( *node_initialize )( const Scheduler_Control *, Thread_Control * ); @@ -375,6 +400,28 @@ extern const Scheduler_Control _Scheduler_Table[]; extern const Scheduler_Assignment _Scheduler_Assignments[]; #endif +#if defined(RTEMS_SMP) + /** + * @brief Does nothing. + * + * @param[in] scheduler Unused. + * @param[in] offers_help Unused. + * @param[in] needs_help Unused. + * + * @retval NULL Always. + */ + Thread_Control *_Scheduler_default_Ask_for_help( + const Scheduler_Control *scheduler, + Thread_Control *offers_help, + Thread_Control *needs_help + ); + + #define SCHEDULER_OPERATION_DEFAULT_ASK_FOR_HELP \ + _Scheduler_default_Ask_for_help, +#else + #define SCHEDULER_OPERATION_DEFAULT_ASK_FOR_HELP +#endif + /** * @brief Does nothing. * |