thread.h

RTEMS (Real-Time Executive for Multiprocessor Systems) is a free open source real-time operating sys

 *  Set the Start.stack field to the address of the stack
 *
 *  NOTES: NONE
 *
 */

unsigned32 _Thread_Stack_Allocate(
  Thread_Control *the_thread,
  unsigned32 stack_size
);

/*
 *  _Thread_Stack_Free
 *
 *  DESCRIPTION:
 *
 *  Deallocate the Thread's stack.
 *  NOTES: NONE
 *
 */

void _Thread_Stack_Free(
  Thread_Control *the_thread
);

/*
 *  _Thread_Initialize
 *
 *  DESCRIPTION:
 *
 *  This routine initializes the specified the thread.  It allocates
 *  all memory associated with this thread.  It completes by adding
 *  the thread to the local object table so operations on this
 *  thread id are allowed.
 *
 *  NOTES:
 *
 *  If stack_area is NULL, it is allocated from the workspace.
 *
 *  If the stack is allocated from the workspace, then it is guaranteed to be
 *  of at least minimum size.
 */

boolean _Thread_Initialize(
  Objects_Information                  *information,
  Thread_Control                       *the_thread,
  void                                 *stack_area,
  unsigned32                            stack_size,
  boolean                               is_fp,
  Priority_Control                      priority,
  boolean                               is_preemptible,
  Thread_CPU_budget_algorithms          budget_algorithm,
  Thread_CPU_budget_algorithm_callout   budget_callout,
  unsigned32                            isr_level,
  Objects_Name                          name
);

/*
 *  _Thread_Start
 *
 *  DESCRIPTION:
 *
 *  This routine initializes the executable information for a thread
 *  and makes it ready to execute.  After this routine executes, the
 *  thread competes with all other threads for CPU time.
 */
 
boolean _Thread_Start(
  Thread_Control           *the_thread,
  Thread_Start_types        the_prototype,
  void                     *entry_point,
  void                     *pointer_argument,
  unsigned32                numeric_argument
);

/*
 *  _Thread_Restart
 *
 *  DESCRIPTION:
 *
 *  This support routine restarts the specified task in a way that the
 *  next time this thread executes, it will begin execution at its
 *  original starting point.
 */
 
/* XXX multiple task arg profiles */
 
boolean _Thread_Restart(
  Thread_Control           *the_thread,
  void                     *pointer_argument,
  unsigned32                numeric_argument
);

/*
 *  _Thread_Reset
 *
 *  DESCRIPTION:
 *
 *  This routine resets a thread to its initial state but does
 *  not restart it.
 */
 
void _Thread_Reset(
  Thread_Control      *the_thread,
  void                *pointer_argument,
  unsigned32           numeric_argument
);

/*
 *  _Thread_Close
 *
 *  DESCRIPTION:
 *
 *  This routine frees all memory associated with the specified
 *  thread and removes it from the local object table so no further
 *  operations on this thread are allowed.
 */
 
void _Thread_Close(
  Objects_Information  *information,
  Thread_Control       *the_thread
);

/*
 *  _Thread_Ready
 *
 *  DESCRIPTION:
 *
 *  This routine removes any set states for the_thread.  It performs
 *  any necessary scheduling operations including the selection of
 *  a new heir thread.
 */

void _Thread_Ready(
  Thread_Control *the_thread
);

/*
 *  _Thread_Clear_state
 *
 *  DESCRIPTION:
 *
 *  This routine clears the indicated STATES for the_thread.  It performs
 *  any necessary scheduling operations including the selection of
 *  a new heir thread.
 */

void _Thread_Clear_state(
  Thread_Control *the_thread,
  States_Control  state
);

/*
 *  _Thread_Set_state
 *
 *  DESCRIPTION:
 *
 *  This routine sets the indicated states for the_thread.  It performs
 *  any necessary scheduling operations including the selection of
 *  a new heir thread.
 *
 */

void _Thread_Set_state(
  Thread_Control *the_thread,
  States_Control  state
);

/*
 *  _Thread_Set_transient
 *
 *  DESCRIPTION:
 *
 *  This routine sets the TRANSIENT state for the_thread.  It performs
 *  any necessary scheduling operations including the selection of
 *  a new heir thread.
 */

void _Thread_Set_transient(
  Thread_Control *the_thread
);

/*
 *  _Thread_Reset_timeslice
 *
 *  DESCRIPTION:
 *
 *  This routine is invoked upon expiration of the currently
 *  executing thread's timeslice.  If no other thread's are ready
 *  at the priority of the currently executing thread, then the
 *  executing thread's timeslice is reset.  Otherwise, the
 *  currently executing thread is placed at the rear of the
 *  FIFO for this priority and a new heir is selected.
 */

void _Thread_Reset_timeslice( void );

/*
 *  _Thread_Tickle_timeslice
 *
 *  DESCRIPTION:
 *
 *  This routine is invoked as part of processing each clock tick.
 *  It is responsible for determining if the current thread allows
 *  timeslicing and, if so, when its timeslice expires.
 */

void _Thread_Tickle_timeslice( void );

/*
 *  _Thread_Yield_processor
 *
 *  DESCRIPTION:
 *
 *  This routine is invoked when a thread wishes to voluntarily
 *  transfer control of the processor to another thread of equal
 *  or greater priority.
 */

void _Thread_Yield_processor( void );

/*  
 *  _Thread_Rotate_Ready_Queue
 *  
 *  DESCRIPTION:
 *  
 *  This routine is invoked to rotate the ready queue for the
 *  given priority.  It can be used to yeild the processor
 *  by rotating the executing threads ready queue.
 */

void _Thread_Rotate_Ready_Queue(
  Priority_Control  priority
);

/*
 *  _Thread_Load_environment
 *
 *  DESCRIPTION:
 *
 *  This routine initializes the context of the_thread to its
 *  appropriate starting state.
 */

void _Thread_Load_environment(
  Thread_Control *the_thread
);

/*
 *  _Thread_Handler
 *
 *  DESCRIPTION:
 *
 *  This routine is the wrapper function for all threads.  It is
 *  the starting point for all threads.  The user provided thread
 *  entry point is invoked by this routine.  Operations
 *  which must be performed immediately before and after the user's
 *  thread executes are found here.
 */

void _Thread_Handler( void );

/*
 *  _Thread_Delay_ended
 *
 *  DESCRIPTION:
 *
 *  This routine is invoked when a thread must be unblocked at the
 *  end of a time based delay (i.e. wake after or wake when).
 */

void _Thread_Delay_ended(
  Objects_Id  id,
  void       *ignored
);

/*
 *  _Thread_Change_priority
 *
 *  DESCRIPTION:
 *
 *  This routine changes the current priority of the_thread to
 *  new_priority.  It performs any necessary scheduling operations
 *  including the selection of a new heir thread.
 */

void _Thread_Change_priority (
  Thread_Control   *the_thread,
  Priority_Control  new_priority,
  boolean           prepend_it
);

/*
 *  _Thread_Set_priority
 *
 *  DESCRIPTION:
 *
 *  This routine updates the priority related fields in the_thread
 *  control block to indicate the current priority is now new_priority.
 */

void _Thread_Set_priority(
  Thread_Control   *the_thread,
  Priority_Control  new_priority
);

/*
 *  _Thread_Suspend
 *
 *  DESCRIPTION:
 *
 *  This routine updates the related suspend fields in the_thread
 *  control block to indicate the current nested level.
 */

void _Thread_Suspend(
  Thread_Control   *the_thread
);

/*
 *  _Thread_Resume
 *
 *  DESCRIPTION:
 *
 *  This routine updates the related suspend fields in the_thread
 *  control block to indicate the current nested level.  A force
 *  parameter of TRUE will force a resume and clear the suspend count.
 */

void _Thread_Resume(
  Thread_Control   *the_thread,
  boolean           force
);

/*
 *  _Thread_Evaluate_mode
 *
 *  DESCRIPTION:
 *
 *  This routine evaluates the current scheduling information for the
 *  system and determines if a context switch is required.  This 
 *  is usually called after changing an execution mode such as preemptability
 *  for a thread.
 */

boolean _Thread_Evaluate_mode( void );

/*
 *  _Thread_Get
 *
 *  NOTE:  If we are not using static inlines, this must be a real
 *         subroutine call.
 */
 
#ifndef USE_INLINES
Thread_Control *_Thread_Get (
  Objects_Id           id,
  Objects_Locations   *location
);
#endif

/*
 *  _Thread_Idle_body
 *
 *  DESCRIPTION:
 *
 *  This routine is the body of the system idle thread.
 */
 
#if (CPU_PROVIDES_IDLE_THREAD_BODY == FALSE)
Thread _Thread_Idle_body(
  unsigned32 ignored
);
#endif

#ifndef __RTEMS_APPLICATION__
#include <rtems/score/thread.inl>
#endif
#if defined(RTEMS_MULTIPROCESSING)
#include <rtems/score/threadmp.h>
#endif

#ifdef __cplusplus
}
#endif

#endif
/* end of include file */