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/*

 *  $Id: pthread.c,v 1.2 2001-09-27 11:59:17 chris Exp $

 */

#include <assert.h>

#include <errno.h>

#include <pthread.h>

#include <limits.h>

#include <rtems/system.h>

#include <rtems/score/apiext.h>

#include <rtems/score/stack.h>

#include <rtems/score/thread.h>

#include <rtems/score/userext.h>

#include <rtems/score/wkspace.h>

#include <rtems/posix/cancel.h>

#include <rtems/posix/pthread.h>

#include <rtems/posix/priority.h>

#include <rtems/posix/psignal.h>

#include <rtems/posix/config.h>

#include <rtems/posix/key.h>

#include <rtems/posix/time.h>

/*PAGE

 *

 *  The default pthreads attributes structure.

 *

 *  NOTE: Be careful .. if the default attribute set changes,

 *        _POSIX_Threads_Initialize_user_threads will need to be examined.

 *

 */

const pthread_attr_t _POSIX_Threads_Default_attributes = {

  TRUE,                       /* is_initialized */

  NULL,                       /* stackaddr */

  PTHREAD_MINIMUM_STACK_SIZE, /* stacksize */

  PTHREAD_SCOPE_PROCESS,      /* contentionscope */

  PTHREAD_INHERIT_SCHED,      /* inheritsched */

  SCHED_FIFO,                 /* schedpolicy */

  {                           /* schedparam */

    2,                        /* sched_priority */

    0,                        /* ss_low_priority */

    { 0L, 0 },                /* ss_replenish_period */

    { 0L, 0 }                 /* ss_initial_budget */

  },

  PTHREAD_CREATE_JOINABLE,    /* detachstate */

  1                           /* cputime_clock_allowed */

};

/*PAGE

 *

 *  _POSIX_Threads_Sporadic_budget_TSR

 */

void _POSIX_Threads_Sporadic_budget_TSR(

  Objects_Id      id,

  void           *argument

)

{

  unsigned32          ticks;

  unsigned32          new_priority;

  Thread_Control     *the_thread;

  POSIX_API_Control  *api;

  the_thread = argument;

  api = the_thread->API_Extensions[ THREAD_API_POSIX ];

  ticks = _POSIX_Timespec_to_interval( &api->schedparam.ss_initial_budget );

  if ( !ticks )

    ticks = 1;

  the_thread->cpu_time_budget = ticks;

  new_priority = _POSIX_Priority_To_core( api->ss_high_priority );

  the_thread->real_priority = new_priority;

  if ( the_thread->resource_count == 0 ||

       the_thread->current_priority > new_priority )

    _Thread_Change_priority( the_thread, new_priority, TRUE );

  ticks = _POSIX_Timespec_to_interval( &api->schedparam.ss_replenish_period );

  if ( !ticks )

    ticks = 1;

  _Watchdog_Insert_ticks( &api->Sporadic_timer, ticks );

}

/*PAGE

 *

 *  _POSIX_Threads_Sporadic_budget_callout

 */

void _POSIX_Threads_Sporadic_budget_callout(

  Thread_Control *the_thread

)

{

  POSIX_API_Control *api;

  unsigned32         new_priority;

  api = the_thread->API_Extensions[ THREAD_API_POSIX ];

  /*

   *  This will prevent the thread from consuming its entire "budget"

   *  while at low priority.

   */

  the_thread->cpu_time_budget = 0xFFFFFFFF; /* XXX should be based on MAX_U32 */

  new_priority = _POSIX_Priority_To_core( api->schedparam.ss_low_priority );

  the_thread->real_priority = new_priority;

 if ( the_thread->resource_count == 0 ||

      the_thread->current_priority > new_priority )

    _Thread_Change_priority( the_thread, new_priority, TRUE );

}

/*PAGE

 *

 *  _POSIX_Threads_Create_extension

 *

 *  XXX

 */

boolean _POSIX_Threads_Create_extension(

  Thread_Control *executing,

  Thread_Control *created

)

{

  POSIX_API_Control *api;

  POSIX_API_Control *executing_api;

  api = _Workspace_Allocate( sizeof( POSIX_API_Control ) );

  if ( !api )

    return FALSE;

  created->API_Extensions[ THREAD_API_POSIX ] = api;

  /* XXX check all fields are touched */

  api->Attributes  = _POSIX_Threads_Default_attributes;

  api->detachstate = _POSIX_Threads_Default_attributes.detachstate;

  api->schedpolicy = _POSIX_Threads_Default_attributes.schedpolicy;

  api->schedparam  = _POSIX_Threads_Default_attributes.schedparam;

  api->schedparam.sched_priority =

     _POSIX_Priority_From_core( created->current_priority );

  /*

   *  POSIX 1003.1 1996, 18.2.2.2

   */

  api->cancelation_requested = 0;

  api->cancelability_state = PTHREAD_CANCEL_ENABLE;

  api->cancelability_type = PTHREAD_CANCEL_DEFERRED;

  _Chain_Initialize_empty (&api->Cancellation_Handlers);

  /*

   *  If the thread is not a posix thread, then all posix signals are blocked

   *  by default.

   */

  /* XXX use signal constants */

  api->signals_pending = 0;

  if ( _Objects_Get_class( created->Object.id ) == OBJECTS_POSIX_THREADS ) {

    executing_api = _Thread_Executing->API_Extensions[ THREAD_API_POSIX ];

    api->signals_blocked = api->signals_blocked;

  } else

    api->signals_blocked = 0xffffffff;

/* XXX set signal parameters -- block all signals for non-posix threads */

  _Thread_queue_Initialize(

    &api->Join_List,

    OBJECTS_NO_CLASS,                 /* only used for proxy operations */

    THREAD_QUEUE_DISCIPLINE_FIFO,

    STATES_WAITING_FOR_JOIN_AT_EXIT,

    NULL,                             /* no extract proxy handler */

  );

  _Watchdog_Initialize(

    &api->Sporadic_timer,

    _POSIX_Threads_Sporadic_budget_TSR,

    created->Object.id,

    created

  );

  return TRUE;

}

/*PAGE

 *

 *  _POSIX_Threads_Delete_extension

 */

User_extensions_routine _POSIX_Threads_Delete_extension(

  Thread_Control *executing,

  Thread_Control *deleted

)

{

  Thread_Control     *the_thread;

  POSIX_API_Control  *api;

  void              **value_ptr;

  api = deleted->API_Extensions[ THREAD_API_POSIX ];

  /* XXX run cancellation handlers */

  _POSIX_Keys_Run_destructors( deleted );

  /*

   *  Wakeup all the tasks which joined with this one

   */

  value_ptr = (void **) deleted->Wait.return_argument;

  while ( (the_thread = _Thread_queue_Dequeue( &api->Join_List )) )

      *(void **)the_thread->Wait.return_argument = value_ptr;

  if ( api->schedpolicy == SCHED_SPORADIC )

    (void) _Watchdog_Remove( &api->Sporadic_timer );

  deleted->API_Extensions[ THREAD_API_POSIX ] = NULL;

  (void) _Workspace_Free( api );

}

/*

 *

 *  _POSIX_Threads_Exitted_extension

 */

User_extensions_routine _POSIX_Threads_Exitted_extension(

  Thread_Control *executing

)

{

  pthread_exit( executing->Wait.return_argument );

}

/*PAGE

 *

 *  _POSIX_Threads_Initialize_user_threads

 *

 *  This routine creates and starts all configured user

 *  initialzation threads.

 *

 *  Input parameters: NONE

 *

 *  Output parameters:  NONE

 */

void _POSIX_Threads_Initialize_user_threads( void )

{

  int                                 status;

  unsigned32                          index;

  unsigned32                          maximum;

  posix_initialization_threads_table *user_threads;

  pthread_t                           thread_id;

  pthread_attr_t                      attr;

  user_threads = _POSIX_Threads_User_initialization_threads;

  maximum      = _POSIX_Threads_Number_of_initialization_threads;

  if ( !user_threads || maximum == 0 )

    return;

  /*

   *  Be careful .. if the default attribute set changes, this may need to.

   *

   *  Setting the attributes explicitly is critical, since we don't want

   *  to inherit the idle tasks attributes.

   */

  for ( index=0 ; index < maximum ; index++ ) {

    status = pthread_attr_init( &attr );

    assert( !status );

    status = pthread_attr_setinheritsched( &attr, PTHREAD_EXPLICIT_SCHED );

    assert( !status );

    status = pthread_attr_setstacksize( &attr, user_threads[ index ].stack_size);

    assert( !status );

    status = pthread_create(

      &thread_id,

      &attr,

      user_threads[ index ].thread_entry,

      NULL

    );

    assert( !status );

  }

}

/*PAGE

 *

 *  API Extension control structures

 */

API_extensions_Control _POSIX_Threads_API_extensions = {

  { NULL, NULL },

  NULL,                                     /* predriver */

  _POSIX_Threads_Initialize_user_threads,   /* postdriver */

  _POSIX_signals_Post_switch_extension,     /* post switch */

};

User_extensions_Control _POSIX_Threads_User_extensions = {

  { NULL, NULL },

  { _POSIX_Threads_Create_extension,          /* create */

    NULL,                                     /* start */

    NULL,                                     /* restart */

    _POSIX_Threads_Delete_extension,          /* delete */

    NULL,                                     /* switch */

    NULL,                                     /* begin */

    _POSIX_Threads_Exitted_extension,         /* exitted */

    NULL                                      /* fatal */

  }

};

/*PAGE

 *

 *  _POSIX_Threads_Manager_initialization

 *

 *  This routine initializes all threads manager related data structures.

 *

 *  Input parameters:

 *    maximum_pthreads - maximum configured pthreads

 *

 *  Output parameters:  NONE

 */

void _POSIX_Threads_Manager_initialization(

  unsigned32                          maximum_pthreads,

  unsigned32                          number_of_initialization_threads,

  posix_initialization_threads_table *user_threads

)

{

  _POSIX_Threads_Number_of_initialization_threads =

                                           number_of_initialization_threads;

  _POSIX_Threads_User_initialization_threads = user_threads;

  /*

   *  There may not be any POSIX initialization threads configured.

   */

#if 0

  if ( user_threads == NULL || number_of_initialization_threads == 0 )

    _Internal_error_Occurred( INTERNAL_ERROR_POSIX_API, TRUE, EINVAL );

#endif

  _Objects_Initialize_information(

    &_POSIX_Threads_Information,

    OBJECTS_POSIX_THREADS,

    FALSE,                               /* does not support global */

    maximum_pthreads,

    sizeof( Thread_Control ),

    FALSE,

    0,                                   /* length is arbitrary for now */

    TRUE                                 /* this class is threads */

  );

  /*

   *  Add all the extensions for this API

   */

  _User_extensions_Add_API_set( &_POSIX_Threads_User_extensions );

  _API_extensions_Add( &_POSIX_Threads_API_extensions );

  /*

   *  If we supported MP, then here we would ...

   *       Register the MP Process Packet routine.

   */

}