posix/src/keydelete.c

0001 /* SPDX-License-Identifier: BSD-2-Clause */
0002
0003 /**
0004  * @file
0005  *
0006  * @ingroup POSIXAPI
0007  *
0008  * @brief Deletes Thread-specific Data Key Previously Returned by keycreate.c
0009  */
0010
0011 /*
0012  * COPYRIGHT (c) 1989-2007.
0013  * On-Line Applications Research Corporation (OAR).
0014  * Copyright (c) 2016 embedded brains GmbH & Co. KG
0015  *
0016  * Redistribution and use in source and binary forms, with or without
0017  * modification, are permitted provided that the following conditions
0018  * are met:
0019  * 1. Redistributions of source code must retain the above copyright
0020  *    notice, this list of conditions and the following disclaimer.
0021  * 2. Redistributions in binary form must reproduce the above copyright
0022  *    notice, this list of conditions and the following disclaimer in the
0023  *    documentation and/or other materials provided with the distribution.
0024  *
0025  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
0026  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
0027  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
0028  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
0029  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
0030  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
0031  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
0032  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
0033  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
0034  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
0035  * POSSIBILITY OF SUCH DAMAGE.
0036  */
0037
0038 #ifdef HAVE_CONFIG_H
0039 #include "config.h"
0040 #endif
0041
0042 #include <rtems/posix/keyimpl.h>
0043
0044 #include <errno.h>
0045
0046 static void _POSIX_Keys_Destroy( POSIX_Keys_Control *the_key )
0047 {
0048   _Objects_Close( &_POSIX_Keys_Information, &the_key->Object );
0049
0050   while ( !_Chain_Is_empty( &the_key->Key_value_pairs ) ) {
0051     POSIX_Keys_Key_value_pair *key_value_pair;
0052     ISR_lock_Context           lock_context;
0053     Thread_Control            *the_thread;
0054
0055     key_value_pair = (POSIX_Keys_Key_value_pair *)
0056       _Chain_First( &the_key->Key_value_pairs );
0057
0058     the_thread = key_value_pair->thread;
0059     _POSIX_Keys_Key_value_acquire( the_thread, &lock_context );
0060     _RBTree_Extract(
0061       &the_thread->Keys.Key_value_pairs,
0062       &key_value_pair->Lookup_node
0063     );
0064     _POSIX_Keys_Key_value_release( the_thread, &lock_context );
0065
0066     _POSIX_Keys_Key_value_free( key_value_pair );
0067   }
0068
0069   _Objects_Free( &_POSIX_Keys_Information, &the_key->Object );
0070 }
0071
0072 /*
0073  *  17.1.3 Thread-Specific Data Key Deletion, P1003.1c/Draft 10, p. 167
0074  */
0075 int pthread_key_delete(
0076   pthread_key_t  key
0077 )
0078 {
0079   POSIX_Keys_Control *the_key;
0080   int                 eno;
0081
0082   _Objects_Allocator_lock();
0083
0084   the_key = _POSIX_Keys_Get( key );
0085   if ( the_key != NULL ) {
0086     _POSIX_Keys_Destroy( the_key );
0087     eno = 0;
0088   } else {
0089     eno = EINVAL;
0090   }
0091
0092   _Objects_Allocator_unlock();
0093
0094   return eno;
0095 }