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score: Support scheduler change inhibitors

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For example, the POSIX sporadic server adds a second priority to a
thread.  We cannot account for this priority in a scheduler change.

Update #5164.
This commit is contained in:
Sebastian Huber
2024-11-26 04:30:39 +01:00
committed by Chris Johns
parent 63c5d062c3
commit 7f00921b07
4 changed files with 33 additions and 0 deletions
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6
cpukit/include/rtems/score/schedulerimpl.h
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@@ -942,6 +942,12 @@ static inline Status_Control _Scheduler_Set(
#endif #endif
#if defined(RTEMS_SCORE_THREAD_HAS_SCHEDULER_CHANGE_INHIBITORS)
if ( the_thread->is_scheduler_change_inhibited ) {
return STATUS_RESOURCE_IN_USE;
}
#endif
if ( the_thread->Wait.queue != NULL ) { if ( the_thread->Wait.queue != NULL ) {
return STATUS_RESOURCE_IN_USE; return STATUS_RESOURCE_IN_USE;
} }

20
cpukit/include/rtems/score/thread.h
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@@ -112,6 +112,16 @@ extern "C" {
#define RTEMS_SCORE_THREAD_REAL_PRIORITY_MAY_BE_INACTIVE #define RTEMS_SCORE_THREAD_REAL_PRIORITY_MAY_BE_INACTIVE
#endif #endif
#if defined(RTEMS_POSIX_API) && defined(RTEMS_SMP)
/**
* @brief This define enables support to inhibit scheduler changes.
*
* For example, the POSIX sporadic server adds a second priority to a thread.
* We cannot account for this priority in a scheduler change.
*/
#define RTEMS_SCORE_THREAD_HAS_SCHEDULER_CHANGE_INHIBITORS
#endif
/** /**
* @brief Type of the numeric argument of a thread entry function with at * @brief Type of the numeric argument of a thread entry function with at
* least one numeric argument. * least one numeric argument.
@@ -911,6 +921,16 @@ struct _Thread_Control {
*/ */
bool was_created_with_inherited_scheduler; bool was_created_with_inherited_scheduler;
#if defined(RTEMS_SCORE_THREAD_HAS_SCHEDULER_CHANGE_INHIBITORS)
/**
* @brief This field is true, if scheduler changes are inhibited.
*
* Currently, the POSIX sporadic server is the only inhibitor. If more are
* added, then this needs to be changed to a counter or a bit field.
*/
bool is_scheduler_change_inhibited;
#endif
/** /**
* @brief This member contains the CPU budget control used to manage the CPU * @brief This member contains the CPU budget control used to manage the CPU
* budget of the thread. * budget of the thread.

3
cpukit/posix/src/pthreadcreate.c
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@@ -301,6 +301,9 @@ int pthread_create(
the_attr->schedparam.sched_ss_max_repl; the_attr->schedparam.sched_ss_max_repl;
if ( schedpolicy == SCHED_SPORADIC ) { if ( schedpolicy == SCHED_SPORADIC ) {
#if defined(RTEMS_SCORE_THREAD_HAS_SCHEDULER_CHANGE_INHIBITORS)
the_thread->is_scheduler_change_inhibited = true;
#endif
_POSIX_Threads_Sporadic_timer( &api->Sporadic.Timer ); _POSIX_Threads_Sporadic_timer( &api->Sporadic.Timer );
} }
#endif #endif

4
cpukit/posix/src/pthreadsetschedparam.c
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@@ -78,6 +78,10 @@ static int _POSIX_Set_sched_param(
return EINVAL; return EINVAL;
} }
#if defined(RTEMS_SCORE_THREAD_HAS_SCHEDULER_CHANGE_INHIBITORS)
the_thread->is_scheduler_change_inhibited = ( policy == SCHED_SPORADIC );
#endif
#if defined(RTEMS_POSIX_API) #if defined(RTEMS_POSIX_API)
if ( policy == SCHED_SPORADIC ) { if ( policy == SCHED_SPORADIC ) {
low_prio = param->sched_ss_low_priority; low_prio = param->sched_ss_low_priority;