Subversion Repositories shark

/*

 * Project: S.Ha.R.K.

 *

 * Coordinators:

 *   Giorgio Buttazzo    <giorgio@sssup.it>

 *   Paolo Gai           <pj@gandalf.sssup.it>

 *

 * Authors     :

 *   Paolo Gai           <pj@gandalf.sssup.it>

 *   (see the web pages for full authors list)

 *

 * ReTiS Lab (Scuola Superiore S.Anna - Pisa - Italy)

 *

 * http://www.sssup.it

 * http://retis.sssup.it

 * http://shark.sssup.it

 */

/**

 ------------

 CVS :        $Id: pthread.c,v 1.3 2003-11-05 15:05:12 giacomo Exp $

 File:        $File$

 Revision:    $Revision: 1.3 $

 Last update: $Date: 2003-11-05 15:05:12 $

 ------------

 pthread.c

 This file contains the implementation of various posix primitives:

 refer to POSIX standard...

 maybe in the near future this functions will become inline functions...

**/

/*

 * Copyright (C) 2000 Paolo Gai

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; either version 2 of the License, or

 * (at your option) any later version.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

 *

 */

#include <kernel/const.h>

#include <kernel/func.h>

#include <pthread.h>

#include <errno.h>

#include <modules/pi.h>

#include <modules/pc.h>

#include <modules/posix.h>

// this fields are used to store the levels used in the pthread_functions...

static LEVEL level_sched;

static RLEVEL level_PI;

static RLEVEL level_PC;

// This function register the POSIX interface into the system...

void PTHREAD_register_module(LEVEL sched, RLEVEL pi, RLEVEL pc)

{

  level_sched = sched;

  level_PI    = pi;

  level_PC    = pc;

}

/*---------------------------------------------------------------------*/

/* 11.3.2 Initializing and Destroying a Mutex                          */

/*---------------------------------------------------------------------*/

int pthread_mutex_init(pthread_mutex_t *mutex, const pthread_mutexattr_t *attr)

{

  if (!attr || attr->protocol == PTHREAD_PRIO_NONE) {

    NOP_mutexattr_t m_nop;

    NOP_mutexattr_default(m_nop);

    return mutex_init(mutex,&m_nop);

  }

  else if (attr->protocol == PTHREAD_PRIO_INHERIT) {

    PI_mutexattr_t m_pi;

    PI_mutexattr_default(m_pi);

    return mutex_init(mutex,&m_pi);

  }

  else {   // PTHREAD_PRIO_PROTECT

    PC_mutexattr_t m_pc;

    PC_mutexattr_default(m_pc, sched_get_priority_max(SCHED_RR)-attr->prioceiling);

    return mutex_init(mutex,(mutexattr_t *)&m_pc);

  }

}

/*---------------------------------------------------------------------*/

/* 13.3.5 Yield processor                                              */

/*---------------------------------------------------------------------*/

int sched_yield(void)

{

  return POSIX_sched_yield(level_sched);

}

/*---------------------------------------------------------------------*/

/* 13.3.6 Get Scheduling Parameter Limits                              */

/*---------------------------------------------------------------------*/

int sched_get_priority_max(int policy)

{

  return POSIX_get_priority_max(level_sched);

}

int sched_rr_get_interval(pid_t pid, struct timespec *interval)

{

  return POSIX_rr_get_interval(level_sched);

}

/*---------------------------------------------------------------------*/

/* 13.5.2 Dynamic Thread Schedu ling Parameters Access                  */

/*---------------------------------------------------------------------*/

int pthread_getschedparam(pthread_t thread, int *policy,

                          struct sched_param *param)

{

  int returnvalue;

  SYS_FLAGS f;

  f = kern_fsave();

  returnvalue = POSIX_getschedparam(level_sched, thread, policy,

                                    &param->sched_priority);

  kern_frestore(f);

  return returnvalue;

}

int pthread_setschedparam(pthread_t thread, int policy, const struct sched_param *param)

{

  int returnvalue;

  SYS_FLAGS f;

  f = kern_fsave();

  returnvalue = POSIX_setschedparam(level_sched, thread, policy,

                                    param->sched_priority);

  if (!returnvalue)

    PC_set_task_ceiling(level_PC, thread,

                        sched_get_priority_max(SCHED_RR) -

                          param->sched_priority);

  kern_frestore(f);

  return returnvalue;

}

/*---------------------------------------------------------------------*/

/* 13.6.2 Change the priority Ceiling of a Mutex                       */

/*---------------------------------------------------------------------*/

int pthread_mutex_setprioceiling(pthread_mutex_t *mutex, int prioceiling,

                                 int *old_ceiling)

{

  int returnvalue = 0;

  int max = sched_get_priority_max(SCHED_RR);

  if (prioceiling > max || prioceiling < sched_get_priority_min(SCHED_RR))

    return EINVAL;

  mutex_lock(mutex);

  if (PC_set_mutex_ceiling(mutex,

                           max - prioceiling,

                           (DWORD *)old_ceiling))

    returnvalue = EINVAL;

  if (old_ceiling)

    *old_ceiling = max - *old_ceiling;

  mutex_unlock(mutex);

  return returnvalue;

}

int pthread_mutex_getprioceiling(const pthread_mutex_t *mutex,

                                 int *prioceiling)

{

  PC_get_mutex_ceiling(mutex, (DWORD *)prioceiling);

  *prioceiling = sched_get_priority_max(SCHED_RR) - *prioceiling;

  return 0;

}

/*---------------------------------------------------------------------*/

/* 16.2.2 Thread Creation                                              */

/*---------------------------------------------------------------------*/

int pthread_create(pthread_t *thread, const pthread_attr_t *attr,

                   void *(*start_routine)(void *), void *arg)

{

  NRT_TASK_MODEL m;   // the scheduling model

  PC_RES_MODEL   pc;  // the resource model used for Priority Ceiling

  int olderrno;       // the pthread_create don't modify errno

  nrt_task_default_model(m);

  nrt_task_def_arg(m,arg);

  nrt_task_def_usemath(m);

  nrt_task_def_ctrl_jet(m);

  nrt_task_def_save_arrivals(m);

  nrt_task_def_level(m, level_sched);

  if (attr) {

    nrt_task_def_stack(m,attr->stacksize);

    nrt_task_def_stackaddr(m,attr->stackaddr);

    if (attr->detachstate == PTHREAD_CREATE_JOINABLE)

      nrt_task_def_joinable(m);

    else

      nrt_task_def_unjoinable(m);

    nrt_task_def_weight(m, attr->schedparam.sched_priority);

    PC_res_default_model(pc, sched_get_priority_max(SCHED_RR) - attr->schedparam.sched_priority);

    nrt_task_def_policy(m,attr->schedpolicy);

    nrt_task_def_inherit(m,attr->inheritsched);

  }

  else {

    nrt_task_def_stack(m,PTHREAD_STACK_MIN);

    nrt_task_def_stackaddr(m,NULL);

    nrt_task_def_joinable(m);

    nrt_task_def_weight(m, sched_get_priority_min(SCHED_RR));

    PC_res_default_model(pc, sched_get_priority_max(SCHED_RR));

    nrt_task_def_policy(m,SCHED_RR);

    nrt_task_def_inherit(m,PTHREAD_EXPLICIT_SCHED);

  }

  olderrno = errno;

  *thread = task_createn("Posix task", start_routine,

                                       (TASK_MODEL *)&m,

                                       &pc, NULL);

  if (*thread != NIL)

    task_activate(*thread);

  errno = olderrno;

  if (*thread == NIL)

    return EINVAL;

  else

    return 0;

}

/*---------------------------------------------------------------------*/

/* 16.2.8 Dynamic Package initialization                               */

/*---------------------------------------------------------------------*/

int pthread_once(pthread_once_t *once_control, void (*init_routine)(void))

{

  SYS_FLAGS f;

  f = kern_fsave();

  if (!(*once_control)) {

    *once_control = 1;

    kern_frestore(f);

    init_routine();

  }

  else

    kern_frestore(f);

  return 0;

}

/*---------------------------------------------------------------------*/

/* 18.2.1 Canceling Execution of a Thread                              */

/*---------------------------------------------------------------------*/

int pthread_cancel(pthread_t thread)

{

   int olderrno; // pthread_cancel doesn't modify errno

   int rvalue;   // the return value

   olderrno = errno;

   rvalue = task_kill(thread);

   errno = olderrno;

   if (rvalue)

     return (ESRCH);

   else

     return 0;

}