coremuteximpl.h

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/* SPDX-License-Identifier: BSD-2-Clause */

 
/*
 *  COPYRIGHT (c) 1989-2009.
 *  On-Line Applications Research Corporation (OAR).
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */
 
#ifndef _RTEMS_SCORE_COREMUTEXIMPL_H
#define _RTEMS_SCORE_COREMUTEXIMPL_H
 
#include <rtems/score/coremutex.h>
#include <rtems/score/chainimpl.h>
#include <rtems/score/schedulerimpl.h>
#include <rtems/score/status.h>
#include <rtems/score/threadimpl.h>
#include <rtems/score/threadqimpl.h>
 
#ifdef __cplusplus
extern "C" {
#endif

 
#define CORE_MUTEX_TQ_OPERATIONS &_Thread_queue_Operations_priority
 
#define CORE_MUTEX_TQ_PRIORITY_INHERIT_OPERATIONS \
  &_Thread_queue_Operations_priority_inherit

static inline void _CORE_mutex_Initialize(
  CORE_mutex_Control *the_mutex
)
{
  _Thread_queue_Object_initialize( &the_mutex->Wait_queue );
}

static inline void _CORE_mutex_Destroy( CORE_mutex_Control *the_mutex )
{
  _Thread_queue_Destroy( &the_mutex->Wait_queue );
}

static inline void _CORE_mutex_Acquire_critical(
  CORE_mutex_Control   *the_mutex,
  Thread_queue_Context *queue_context
)
{
  _Thread_queue_Acquire_critical( &the_mutex->Wait_queue, queue_context );
}

static inline void _CORE_mutex_Release(
  CORE_mutex_Control   *the_mutex,
  Thread_queue_Context *queue_context
)
{
  _Thread_queue_Release( &the_mutex->Wait_queue, queue_context );
}

static inline Thread_Control *_CORE_mutex_Get_owner(
  const CORE_mutex_Control *the_mutex
)
{
  return the_mutex->Wait_queue.Queue.owner;
}

static inline bool _CORE_mutex_Is_locked(
  const CORE_mutex_Control *the_mutex
)
{
  return _CORE_mutex_Get_owner( the_mutex ) != NULL;
}

Status_Control _CORE_mutex_Seize_slow(
  CORE_mutex_Control            *the_mutex,
  const Thread_queue_Operations *operations,
  Thread_Control                *executing,
  bool                           wait,
  Thread_queue_Context          *queue_context
);

static inline void _CORE_mutex_Set_owner(
  CORE_mutex_Control *the_mutex,
  Thread_Control     *owner
)
{
  the_mutex->Wait_queue.Queue.owner = owner;
}

static inline bool _CORE_mutex_Is_owner(
  const CORE_mutex_Control *the_mutex,
  const Thread_Control     *the_thread
)
{
  return _CORE_mutex_Get_owner( the_mutex ) == the_thread;
}

static inline void _CORE_recursive_mutex_Initialize(
  CORE_recursive_mutex_Control *the_mutex
)
{
  _CORE_mutex_Initialize( &the_mutex->Mutex );
  the_mutex->nest_level = 0;
}

static inline Status_Control _CORE_recursive_mutex_Seize_nested(
  CORE_recursive_mutex_Control *the_mutex
)
{
  ++the_mutex->nest_level;
  return STATUS_SUCCESSFUL;
}

static inline Status_Control _CORE_recursive_mutex_Seize(
  CORE_recursive_mutex_Control  *the_mutex,
  const Thread_queue_Operations *operations,
  Thread_Control                *executing,
  bool                           wait,
  Status_Control              ( *nested )( CORE_recursive_mutex_Control * ),
  Thread_queue_Context          *queue_context
)
{
  Thread_Control *owner;
 
  _CORE_mutex_Acquire_critical( &the_mutex->Mutex, queue_context );
 
  owner = _CORE_mutex_Get_owner( &the_mutex->Mutex );
 
  if ( owner == NULL ) {
    _CORE_mutex_Set_owner( &the_mutex->Mutex, executing );
    _Thread_Resource_count_increment( executing );
    _CORE_mutex_Release( &the_mutex->Mutex, queue_context );
    return STATUS_SUCCESSFUL;
  }
 
  if ( owner == executing ) {
    Status_Control status;
 
    status = ( *nested )( the_mutex );
    _CORE_mutex_Release( &the_mutex->Mutex, queue_context );
    return status;
  }
 
  return _CORE_mutex_Seize_slow(
    &the_mutex->Mutex,
    operations,
    executing,
    wait,
    queue_context
  );
}

static inline Status_Control _CORE_recursive_mutex_Surrender(
  CORE_recursive_mutex_Control  *the_mutex,
  const Thread_queue_Operations *operations,
  Thread_Control                *executing,
  Thread_queue_Context          *queue_context
)
{
  unsigned int        nest_level;
  Thread_queue_Heads *heads;
 
  _CORE_mutex_Acquire_critical( &the_mutex->Mutex, queue_context );
 
  if ( !_CORE_mutex_Is_owner( &the_mutex->Mutex, executing ) ) {
    _CORE_mutex_Release( &the_mutex->Mutex, queue_context );
    return STATUS_NOT_OWNER;
  }
 
  nest_level = the_mutex->nest_level;
 
  if ( nest_level > 0 ) {
    the_mutex->nest_level = nest_level - 1;
    _CORE_mutex_Release( &the_mutex->Mutex, queue_context );
    return STATUS_SUCCESSFUL;
  }
 
  _Thread_Resource_count_decrement( executing );
  _CORE_mutex_Set_owner( &the_mutex->Mutex, NULL );
 
  heads = the_mutex->Mutex.Wait_queue.Queue.heads;
 
  if ( heads == NULL ) {
    _CORE_mutex_Release( &the_mutex->Mutex, queue_context );
    return STATUS_SUCCESSFUL;
  }
 
  _Thread_queue_Surrender(
    &the_mutex->Mutex.Wait_queue.Queue,
    heads,
    executing,
    queue_context,
    operations
  );
  return STATUS_SUCCESSFUL;
}

static inline void _CORE_ceiling_mutex_Initialize(
  CORE_ceiling_mutex_Control *the_mutex,
  const Scheduler_Control    *scheduler,
  Priority_Control            priority_ceiling
)
{
  _CORE_recursive_mutex_Initialize( &the_mutex->Recursive );
  _Priority_Node_initialize( &the_mutex->Priority_ceiling, priority_ceiling );
#if defined(RTEMS_SMP)
  the_mutex->scheduler = scheduler;
#endif
}

static inline const Scheduler_Control *
_CORE_ceiling_mutex_Get_scheduler(
  const CORE_ceiling_mutex_Control *the_mutex
)
{
#if defined(RTEMS_SMP)
  return the_mutex->scheduler;
#else
  return &_Scheduler_Table[ 0 ];
#endif
}

static inline void _CORE_ceiling_mutex_Set_priority(
  CORE_ceiling_mutex_Control *the_mutex,
  Priority_Control            priority_ceiling
)
{
  Thread_Control *owner;
 
  owner = _CORE_mutex_Get_owner( &the_mutex->Recursive.Mutex );
 
  if ( owner != NULL ) {
    Thread_queue_Context queue_context;
 
    _Thread_queue_Context_initialize( &queue_context );
    _Thread_queue_Context_clear_priority_updates( &queue_context );
    _Thread_Wait_acquire_critical( owner, &queue_context );
    _Thread_Priority_change(
      owner,
      &the_mutex->Priority_ceiling,
      priority_ceiling,
      PRIORITY_GROUP_LAST,
      &queue_context
    );
    _Thread_Wait_release_critical( owner, &queue_context );
  } else {
    the_mutex->Priority_ceiling.priority = priority_ceiling;
  }
}

static inline Priority_Control _CORE_ceiling_mutex_Get_priority(
  const CORE_ceiling_mutex_Control *the_mutex
)
{
  return the_mutex->Priority_ceiling.priority;
}

static inline Status_Control _CORE_ceiling_mutex_Set_owner(
  CORE_ceiling_mutex_Control *the_mutex,
  Thread_Control             *owner,
  Thread_queue_Context       *queue_context
)
{
  ISR_lock_Context  lock_context;
  Scheduler_Node   *scheduler_node;
  Per_CPU_Control  *cpu_self;
 
  _Thread_Wait_acquire_default_critical( owner, &lock_context );
 
  scheduler_node = _Thread_Scheduler_get_home_node( owner );
 
  if (
    _Priority_Get_priority( &scheduler_node->Wait.Priority )
      < the_mutex->Priority_ceiling.priority
  ) {
    _Thread_Wait_release_default_critical( owner, &lock_context );
    _CORE_mutex_Release( &the_mutex->Recursive.Mutex, queue_context );
    return STATUS_MUTEX_CEILING_VIOLATED;
  }
 
  _CORE_mutex_Set_owner( &the_mutex->Recursive.Mutex, owner );
  _Thread_Resource_count_increment( owner );
  _Thread_Priority_add(
    owner,
    &the_mutex->Priority_ceiling,
    queue_context
  );
  _Thread_Wait_release_default_critical( owner, &lock_context );
 
  cpu_self = _Thread_queue_Dispatch_disable( queue_context );
  _CORE_mutex_Release( &the_mutex->Recursive.Mutex, queue_context );
  _Thread_Priority_update( queue_context );
  _Thread_Dispatch_enable( cpu_self );
  return STATUS_SUCCESSFUL;
}

static inline Status_Control _CORE_ceiling_mutex_Seize(
  CORE_ceiling_mutex_Control    *the_mutex,
  Thread_Control                *executing,
  bool                           wait,
  Status_Control              ( *nested )( CORE_recursive_mutex_Control * ),
  Thread_queue_Context          *queue_context
)
{
  Thread_Control *owner;
 
  _CORE_mutex_Acquire_critical( &the_mutex->Recursive.Mutex, queue_context );
 
#if defined(RTEMS_SMP)
  if (
    _Thread_Scheduler_get_home( executing )
      != _CORE_ceiling_mutex_Get_scheduler( the_mutex )
  ) {
    _CORE_mutex_Release( &the_mutex->Recursive.Mutex, queue_context );
    return STATUS_NOT_DEFINED;
  }
#endif
 
  owner = _CORE_mutex_Get_owner( &the_mutex->Recursive.Mutex );
 
  if ( owner == NULL ) {
    _Thread_queue_Context_clear_priority_updates( queue_context );
    return _CORE_ceiling_mutex_Set_owner(
      the_mutex,
      executing,
      queue_context
    );
  }
 
  if ( owner == executing ) {
    Status_Control status;
 
    status = ( *nested )( &the_mutex->Recursive );
    _CORE_mutex_Release( &the_mutex->Recursive.Mutex, queue_context );
    return status;
  }
 
  return _CORE_mutex_Seize_slow(
    &the_mutex->Recursive.Mutex,
    CORE_MUTEX_TQ_OPERATIONS,
    executing,
    wait,
    queue_context
  );
}

static inline Status_Control _CORE_ceiling_mutex_Surrender(
  CORE_ceiling_mutex_Control *the_mutex,
  Thread_Control             *executing,
  Thread_queue_Context       *queue_context
)
{
  unsigned int nest_level;
 
  _CORE_mutex_Acquire_critical( &the_mutex->Recursive.Mutex, queue_context );
 
  if ( !_CORE_mutex_Is_owner( &the_mutex->Recursive.Mutex, executing ) ) {
    _CORE_mutex_Release( &the_mutex->Recursive.Mutex, queue_context );
    return STATUS_NOT_OWNER;
  }
 
  nest_level = the_mutex->Recursive.nest_level;
 
  if ( nest_level > 0 ) {
    the_mutex->Recursive.nest_level = nest_level - 1;
    _CORE_mutex_Release( &the_mutex->Recursive.Mutex, queue_context );
    return STATUS_SUCCESSFUL;
  }
 
  return _Thread_queue_Surrender_priority_ceiling(
    &the_mutex->Recursive.Mutex.Wait_queue.Queue,
    executing,
    &the_mutex->Priority_ceiling,
    queue_context,
    CORE_MUTEX_TQ_OPERATIONS
  );
}

 
#ifdef __cplusplus
}
#endif
 
#endif
/* end of include file */