scheduler.h

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/*
 *  Copyright (C) 2010 Gedare Bloom.
 *  Copyright (C) 2011 On-Line Applications Research Corporation (OAR).
 *
 *  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_SCHEDULER_H
#define _RTEMS_SCORE_SCHEDULER_H

#include <rtems/score/thread.h>

#ifdef __cplusplus
extern "C" {
#endif

struct Per_CPU_Control;

typedef struct _Scheduler_Control Scheduler_Control;

typedef struct {
  void ( *initialize )( const Scheduler_Control * );

  void ( *schedule )( const Scheduler_Control *, Thread_Control *);

  void ( *yield )(
    const Scheduler_Control *,
    Thread_Control *,
    Scheduler_Node *
  );

  void ( *block )(
    const Scheduler_Control *,
    Thread_Control *,
    Scheduler_Node *
  );

  void ( *unblock )(
    const Scheduler_Control *,
    Thread_Control *,
    Scheduler_Node *
  );

  void ( *update_priority )(
    const Scheduler_Control *,
    Thread_Control *,
    Scheduler_Node *
  );

  Priority_Control ( *map_priority )(
    const Scheduler_Control *,
    Priority_Control
  );

  Priority_Control ( *unmap_priority )(
    const Scheduler_Control *,
    Priority_Control
  );

#if defined(RTEMS_SMP)

  bool ( *ask_for_help )(
    const Scheduler_Control *scheduler,
    Thread_Control          *the_thread,
    Scheduler_Node          *node
  );

  void ( *reconsider_help_request )(
    const Scheduler_Control *scheduler,
    Thread_Control          *the_thread,
    Scheduler_Node          *node
  );

  void ( *withdraw_node )(
    const Scheduler_Control *scheduler,
    Thread_Control          *the_thread,
    Scheduler_Node          *node,
    Thread_Scheduler_state   next_state
  );

  void ( *pin )(
    const Scheduler_Control *scheduler,
    Thread_Control          *the_thread,
    Scheduler_Node          *node,
    struct Per_CPU_Control  *cpu
  );

  void ( *unpin )(
    const Scheduler_Control *scheduler,
    Thread_Control          *the_thread,
    Scheduler_Node          *node,
    struct Per_CPU_Control  *cpu
  );

  void ( *add_processor )(
    const Scheduler_Control *scheduler,
    Thread_Control          *idle
  );

  Thread_Control *( *remove_processor )(
    const Scheduler_Control *scheduler,
    struct Per_CPU_Control  *cpu
  );
#endif

  void ( *node_initialize )(
    const Scheduler_Control *,
    Scheduler_Node *,
    Thread_Control *,
    Priority_Control
  );

  void ( *node_destroy )( const Scheduler_Control *, Scheduler_Node * );

  void ( *release_job ) (
    const Scheduler_Control *,
    Thread_Control *,
    Priority_Node *,
    uint64_t,
    Thread_queue_Context *
  );

  void ( *cancel_job ) (
    const Scheduler_Control *,
    Thread_Control *,
    Priority_Node *,
    Thread_queue_Context *
  );

  void ( *tick )( const Scheduler_Control *, Thread_Control * );

  void ( *start_idle )(
    const Scheduler_Control *,
    Thread_Control *,
    struct Per_CPU_Control *
  );

#if defined(RTEMS_SMP)

  bool ( *set_affinity )(
    const Scheduler_Control *,
    Thread_Control *,
    Scheduler_Node *,
    const Processor_mask *
  );
#endif
} Scheduler_Operations;

typedef struct Scheduler_Context {
  ISR_LOCK_MEMBER( Lock )

#if defined(RTEMS_SMP)

  Processor_mask Processors;
#endif
} Scheduler_Context;

struct _Scheduler_Control {
  Scheduler_Context *context;

  Scheduler_Operations Operations;

  Priority_Control maximum_priority;

  uint32_t name;

#if defined(RTEMS_SMP)

  bool is_non_preempt_mode_supported;
#endif
};

extern const Scheduler_Control _Scheduler_Table[];

#if defined(RTEMS_SMP)
  extern const size_t _Scheduler_Count;
#else
  #define _Scheduler_Count ( (size_t) 1 )
#endif

#if defined(RTEMS_SMP)

  #define SCHEDULER_ASSIGN_DEFAULT UINT32_C(0x0)

  #define SCHEDULER_ASSIGN_PROCESSOR_OPTIONAL SCHEDULER_ASSIGN_DEFAULT

  #define SCHEDULER_ASSIGN_PROCESSOR_MANDATORY UINT32_C(0x1)

  typedef struct {
    const Scheduler_Control *scheduler;

    uint32_t attributes;
  } Scheduler_Assignment;

  extern const Scheduler_Assignment _Scheduler_Initial_assignments[];
#endif

Priority_Control _Scheduler_default_Map_priority(
  const Scheduler_Control *scheduler,
  Priority_Control         priority
);

Priority_Control _Scheduler_default_Unmap_priority(
  const Scheduler_Control *scheduler,
  Priority_Control         priority
);

#if defined(RTEMS_SMP)

  bool _Scheduler_default_Ask_for_help(
    const Scheduler_Control *scheduler,
    Thread_Control          *the_thread,
    Scheduler_Node          *node
  );

  void _Scheduler_default_Reconsider_help_request(
    const Scheduler_Control *scheduler,
    Thread_Control          *the_thread,
    Scheduler_Node          *node
  );

  void _Scheduler_default_Withdraw_node(
    const Scheduler_Control *scheduler,
    Thread_Control          *the_thread,
    Scheduler_Node          *node,
    Thread_Scheduler_state   next_state
  );

  void _Scheduler_default_Pin_or_unpin(
    const Scheduler_Control *scheduler,
    Thread_Control          *the_thread,
    Scheduler_Node          *node,
    struct Per_CPU_Control  *cpu
  );

  #define SCHEDULER_OPERATION_DEFAULT_ASK_FOR_HELP \
    _Scheduler_default_Ask_for_help, \
    _Scheduler_default_Reconsider_help_request, \
    _Scheduler_default_Withdraw_node, \
    _Scheduler_default_Pin_or_unpin, \
    _Scheduler_default_Pin_or_unpin, \
    NULL, \
    NULL,
#else
  #define SCHEDULER_OPERATION_DEFAULT_ASK_FOR_HELP
#endif

void _Scheduler_default_Schedule(
  const Scheduler_Control *scheduler,
  Thread_Control          *the_thread
);

void _Scheduler_default_Node_initialize(
  const Scheduler_Control *scheduler,
  Scheduler_Node          *node,
  Thread_Control          *the_thread,
  Priority_Control         priority
);

void _Scheduler_default_Node_destroy(
  const Scheduler_Control *scheduler,
  Scheduler_Node          *node
);

void _Scheduler_default_Release_job(
  const Scheduler_Control *scheduler,
  Thread_Control          *the_thread,
  Priority_Node           *priority_node,
  uint64_t                 deadline,
  Thread_queue_Context    *queue_context
);

void _Scheduler_default_Cancel_job(
  const Scheduler_Control *scheduler,
  Thread_Control          *the_thread,
  Priority_Node           *priority_node,
  Thread_queue_Context    *queue_context
);

void _Scheduler_default_Tick(
  const Scheduler_Control *scheduler,
  Thread_Control          *executing
);

void _Scheduler_default_Start_idle(
  const Scheduler_Control *scheduler,
  Thread_Control          *the_thread,
  struct Per_CPU_Control  *cpu
);

#if defined(RTEMS_SMP)

  bool _Scheduler_default_Set_affinity(
    const Scheduler_Control *scheduler,
    Thread_Control          *thread,
    Scheduler_Node          *node,
    const Processor_mask    *affinity
  );

  #define SCHEDULER_OPERATION_DEFAULT_GET_SET_AFFINITY \
    , _Scheduler_default_Set_affinity
#else
  #define SCHEDULER_OPERATION_DEFAULT_GET_SET_AFFINITY
#endif

#define PRIORITY_MAXIMUM ( _Scheduler_Table[ 0 ].maximum_priority )

#ifdef __cplusplus
}
#endif

#endif
/* end of include file */