/*
* Copyright (c) 2014, 2016 embedded brains GmbH. All rights reserved.
*
* embedded brains GmbH
* Dornierstr. 4
* 82178 Puchheim
* Germany
* <rtems@embedded-brains.de>
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.org/license/LICENSE.
*/
#ifndef _RTEMS_SCORE_MRSPIMPL_H
#define _RTEMS_SCORE_MRSPIMPL_H
#include <rtems/score/mrsp.h>
#if defined(RTEMS_SMP)
#include <rtems/score/assert.h>
#include <rtems/score/status.h>
#include <rtems/score/threadqimpl.h>
#include <rtems/score/watchdogimpl.h>
#include <rtems/score/wkspace.h>
#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */
/**
* @addtogroup ScoreMRSP
*
* @{
*/
#define MRSP_TQ_OPERATIONS &_Thread_queue_Operations_priority_inherit
RTEMS_INLINE_ROUTINE void _MRSP_Acquire_critical(
MRSP_Control *mrsp,
Thread_queue_Context *queue_context
)
{
_Thread_queue_Acquire_critical( &mrsp->Wait_queue, queue_context );
}
RTEMS_INLINE_ROUTINE void _MRSP_Release(
MRSP_Control *mrsp,
Thread_queue_Context *queue_context
)
{
_Thread_queue_Release( &mrsp->Wait_queue, queue_context );
}
RTEMS_INLINE_ROUTINE Thread_Control *_MRSP_Get_owner(
const MRSP_Control *mrsp
)
{
return mrsp->Wait_queue.Queue.owner;
}
RTEMS_INLINE_ROUTINE void _MRSP_Set_owner(
MRSP_Control *mrsp,
Thread_Control *owner
)
{
mrsp->Wait_queue.Queue.owner = owner;
}
RTEMS_INLINE_ROUTINE Priority_Control _MRSP_Get_priority(
const MRSP_Control *mrsp,
const Scheduler_Control *scheduler
)
{
uint32_t scheduler_index;
scheduler_index = _Scheduler_Get_index( scheduler );
return mrsp->ceiling_priorities[ scheduler_index ];
}
RTEMS_INLINE_ROUTINE void _MRSP_Set_priority(
MRSP_Control *mrsp,
const Scheduler_Control *scheduler,
Priority_Control new_priority
)
{
uint32_t scheduler_index;
scheduler_index = _Scheduler_Get_index( scheduler );
mrsp->ceiling_priorities[ scheduler_index ] = new_priority;
}
RTEMS_INLINE_ROUTINE Status_Control _MRSP_Raise_priority(
MRSP_Control *mrsp,
Thread_Control *thread,
Priority_Node *priority_node,
Thread_queue_Context *queue_context
)
{
Status_Control status;
ISR_lock_Context lock_context;
const Scheduler_Control *scheduler;
Priority_Control ceiling_priority;
Scheduler_Node *scheduler_node;
_Thread_queue_Context_clear_priority_updates( queue_context );
_Thread_Wait_acquire_default_critical( thread, &lock_context );
scheduler = _Thread_Scheduler_get_home( thread );
scheduler_node = _Thread_Scheduler_get_home_node( thread );
ceiling_priority = _MRSP_Get_priority( mrsp, scheduler );
if (
ceiling_priority
<= _Priority_Get_priority( &scheduler_node->Wait.Priority )
) {
_Priority_Node_initialize( priority_node, ceiling_priority );
_Thread_Priority_add( thread, priority_node, queue_context );
status = STATUS_SUCCESSFUL;
} else {
status = STATUS_MUTEX_CEILING_VIOLATED;
}
_Thread_Wait_release_default_critical( thread, &lock_context );
return status;
}
RTEMS_INLINE_ROUTINE void _MRSP_Remove_priority(
Thread_Control *thread,
Priority_Node *priority_node,
Thread_queue_Context *queue_context
)
{
ISR_lock_Context lock_context;
_Thread_queue_Context_clear_priority_updates( queue_context );
_Thread_Wait_acquire_default_critical( thread, &lock_context );
_Thread_Priority_remove( thread, priority_node, queue_context );
_Thread_Wait_release_default_critical( thread, &lock_context );
}
RTEMS_INLINE_ROUTINE void _MRSP_Replace_priority(
MRSP_Control *mrsp,
Thread_Control *thread,
Priority_Node *ceiling_priority
)
{
ISR_lock_Context lock_context;
_Thread_Wait_acquire_default( thread, &lock_context );
_Thread_Priority_replace(
thread,
ceiling_priority,
&mrsp->Ceiling_priority
);
_Thread_Wait_release_default( thread, &lock_context );
}
RTEMS_INLINE_ROUTINE Status_Control _MRSP_Claim_ownership(
MRSP_Control *mrsp,
Thread_Control *executing,
Thread_queue_Context *queue_context
)
{
Status_Control status;
Per_CPU_Control *cpu_self;
status = _MRSP_Raise_priority(
mrsp,
executing,
&mrsp->Ceiling_priority,
queue_context
);
if ( status != STATUS_SUCCESSFUL ) {
_MRSP_Release( mrsp, queue_context );
return status;
}
_MRSP_Set_owner( mrsp, executing );
cpu_self = _Thread_queue_Dispatch_disable( queue_context );
_MRSP_Release( mrsp, queue_context );
_Thread_Priority_and_sticky_update( executing, 1 );
_Thread_Dispatch_enable( cpu_self );
return STATUS_SUCCESSFUL;
}
RTEMS_INLINE_ROUTINE Status_Control _MRSP_Initialize(
MRSP_Control *mrsp,
const Scheduler_Control *scheduler,
Priority_Control ceiling_priority,
Thread_Control *executing,
bool initially_locked
)
{
uint32_t scheduler_count = _Scheduler_Count;
uint32_t i;
if ( initially_locked ) {
return STATUS_INVALID_NUMBER;
}
mrsp->ceiling_priorities = _Workspace_Allocate(
sizeof( *mrsp->ceiling_priorities ) * scheduler_count
);
if ( mrsp->ceiling_priorities == NULL ) {
return STATUS_NO_MEMORY;
}
for ( i = 0 ; i < scheduler_count ; ++i ) {
const Scheduler_Control *scheduler_of_index;
scheduler_of_index = &_Scheduler_Table[ i ];
if ( scheduler != scheduler_of_index ) {
mrsp->ceiling_priorities[ i ] =
_Scheduler_Map_priority( scheduler_of_index, 0 );
} else {
mrsp->ceiling_priorities[ i ] = ceiling_priority;
}
}
_Thread_queue_Object_initialize( &mrsp->Wait_queue );
return STATUS_SUCCESSFUL;
}
RTEMS_INLINE_ROUTINE Status_Control _MRSP_Wait_for_ownership(
MRSP_Control *mrsp,
Thread_Control *executing,
Thread_queue_Context *queue_context
)
{
Status_Control status;
Priority_Node ceiling_priority;
status = _MRSP_Raise_priority(
mrsp,
executing,
&ceiling_priority,
queue_context
);
if ( status != STATUS_SUCCESSFUL ) {
_MRSP_Release( mrsp, queue_context );
return status;
}
_Thread_queue_Context_set_deadlock_callout(
queue_context,
_Thread_queue_Deadlock_status
);
status = _Thread_queue_Enqueue_sticky(
&mrsp->Wait_queue.Queue,
MRSP_TQ_OPERATIONS,
executing,
queue_context
);
if ( status == STATUS_SUCCESSFUL ) {
_MRSP_Replace_priority( mrsp, executing, &ceiling_priority );
} else {
Thread_queue_Context queue_context;
Per_CPU_Control *cpu_self;
int sticky_level_change;
if ( status != STATUS_DEADLOCK ) {
sticky_level_change = -1;
} else {
sticky_level_change = 0;
}
_ISR_lock_ISR_disable( &queue_context.Lock_context.Lock_context );
_MRSP_Remove_priority( executing, &ceiling_priority, &queue_context );
cpu_self = _Thread_Dispatch_disable_critical(
&queue_context.Lock_context.Lock_context
);
_ISR_lock_ISR_enable( &queue_context.Lock_context.Lock_context );
_Thread_Priority_and_sticky_update( executing, sticky_level_change );
_Thread_Dispatch_enable( cpu_self );
}
return status;
}
RTEMS_INLINE_ROUTINE Status_Control _MRSP_Seize(
MRSP_Control *mrsp,
Thread_Control *executing,
bool wait,
Thread_queue_Context *queue_context
)
{
Status_Control status;
Thread_Control *owner;
_MRSP_Acquire_critical( mrsp, queue_context );
owner = _MRSP_Get_owner( mrsp );
if ( owner == NULL ) {
status = _MRSP_Claim_ownership( mrsp, executing, queue_context );
} else if ( owner == executing ) {
_MRSP_Release( mrsp, queue_context );
status = STATUS_UNAVAILABLE;
} else if ( wait ) {
status = _MRSP_Wait_for_ownership( mrsp, executing, queue_context );
} else {
_MRSP_Release( mrsp, queue_context );
status = STATUS_UNAVAILABLE;
}
return status;
}
RTEMS_INLINE_ROUTINE Status_Control _MRSP_Surrender(
MRSP_Control *mrsp,
Thread_Control *executing,
Thread_queue_Context *queue_context
)
{
Thread_queue_Heads *heads;
if ( _MRSP_Get_owner( mrsp ) != executing ) {
_ISR_lock_ISR_enable( &queue_context->Lock_context.Lock_context );
return STATUS_NOT_OWNER;
}
_MRSP_Acquire_critical( mrsp, queue_context );
_MRSP_Set_owner( mrsp, NULL );
_MRSP_Remove_priority( executing, &mrsp->Ceiling_priority, queue_context );
heads = mrsp->Wait_queue.Queue.heads;
if ( heads == NULL ) {
Per_CPU_Control *cpu_self;
cpu_self = _Thread_Dispatch_disable_critical(
&queue_context->Lock_context.Lock_context
);
_MRSP_Release( mrsp, queue_context );
_Thread_Priority_and_sticky_update( executing, -1 );
_Thread_Dispatch_enable( cpu_self );
return STATUS_SUCCESSFUL;
}
_Thread_queue_Surrender_sticky(
&mrsp->Wait_queue.Queue,
heads,
executing,
queue_context,
MRSP_TQ_OPERATIONS
);
return STATUS_SUCCESSFUL;
}
RTEMS_INLINE_ROUTINE Status_Control _MRSP_Can_destroy( MRSP_Control *mrsp )
{
if ( _MRSP_Get_owner( mrsp ) != NULL ) {
return STATUS_RESOURCE_IN_USE;
}
return STATUS_SUCCESSFUL;
}
RTEMS_INLINE_ROUTINE void _MRSP_Destroy(
MRSP_Control *mrsp,
Thread_queue_Context *queue_context
)
{
_MRSP_Release( mrsp, queue_context );
_Thread_queue_Destroy( &mrsp->Wait_queue );
_Workspace_Free( mrsp->ceiling_priorities );
}
/** @} */
#ifdef __cplusplus
}
#endif /* __cplusplus */
#endif /* RTEMS_SMP */
#endif /* _RTEMS_SCORE_MRSPIMPL_H */