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/*

 *  16.1.8 Dynamic Package Initialization, P1003.1c/Draft 10, p. 154

 *

 *  COPYRIGHT (c) 1989-1999.

 *  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.OARcorp.com/rtems/license.html.

 *

 *  pthreadonce.c,v 1.4 2002/03/01 17:49:57 joel Exp

 */

#if HAVE_CONFIG_H

#include "config.h"

#endif

#include <pthread.h>

#include <errno.h>

#include <rtems.h>

#include <rtems/system.h>

#include <rtems/score/thread.h>

int pthread_once(

  pthread_once_t  *once_control,

  void           (*init_routine)(void)

)

{

  if ( !once_control || !init_routine )

    return EINVAL;

  if ( !once_control->init_executed ) {

    rtems_mode saveMode;

    rtems_task_mode(RTEMS_NO_PREEMPT, RTEMS_PREEMPT_MASK, &saveMode);

    if ( !once_control->init_executed ) {

      once_control->is_initialized = TRUE;

      once_control->init_executed = TRUE;

      (*init_routine)();

    }

    rtems_task_mode(saveMode, RTEMS_PREEMPT_MASK, &saveMode);

  }

  return 0;

}