/* SPDX-License-Identifier: BSD-2-Clause */

/**
 * @file
 *
 * @ingroup POSIXAPI
 *
 * @brief Deletes Thread-specific Data Key Previously Returned by keycreate.c
 */

/*
 * COPYRIGHT (c) 1989-2007.
 * On-Line Applications Research Corporation (OAR).
 * Copyright (c) 2016 embedded brains GmbH & Co. KG
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <rtems/posix/keyimpl.h>

#include <errno.h>

static void _POSIX_Keys_Destroy( POSIX_Keys_Control *the_key )
{
  _Objects_Close( &_POSIX_Keys_Information, &the_key->Object );

  while ( !_Chain_Is_empty( &the_key->Key_value_pairs ) ) {
    POSIX_Keys_Key_value_pair *key_value_pair;
    ISR_lock_Context           lock_context;
    Thread_Control            *the_thread;

    key_value_pair = (POSIX_Keys_Key_value_pair *)
      _Chain_First( &the_key->Key_value_pairs );

    the_thread = key_value_pair->thread;
    _POSIX_Keys_Key_value_acquire( the_thread, &lock_context );
    _RBTree_Extract(
      &the_thread->Keys.Key_value_pairs,
      &key_value_pair->Lookup_node
    );
    _POSIX_Keys_Key_value_release( the_thread, &lock_context );

    _POSIX_Keys_Key_value_free( key_value_pair );
  }

  _Objects_Free( &_POSIX_Keys_Information, &the_key->Object );
}

/*
 *  17.1.3 Thread-Specific Data Key Deletion, P1003.1c/Draft 10, p. 167
 */
int pthread_key_delete(
  pthread_key_t  key
)
{
  POSIX_Keys_Control *the_key;
  int                 eno;

  _Objects_Allocator_lock();

  the_key = _POSIX_Keys_Get( key );
  if ( the_key != NULL ) {
    _POSIX_Keys_Destroy( the_key );
    eno = 0;
  } else {
    eno = EINVAL;
  }

  _Objects_Allocator_unlock();

  return eno;
}