posix/src/keygetspecific.c

0001 /* SPDX-License-Identifier: BSD-2-Clause */
0002
0003 /**
0004  * @file
0005  *
0006  * @ingroup POSIXAPI
0007  *
0008  * @brief Thread-Specific Data Management
0009  */
0010
0011 /*
0012  * Copyright (c) 2012 Zhongwei Yao.
0013  * COPYRIGHT (c) 1989-2007.
0014  * On-Line Applications Research Corporation (OAR).
0015  * Copyright (c) 2016 embedded brains GmbH & Co. KG
0016  *
0017  * Redistribution and use in source and binary forms, with or without
0018  * modification, are permitted provided that the following conditions
0019  * are met:
0020  * 1. Redistributions of source code must retain the above copyright
0021  *    notice, this list of conditions and the following disclaimer.
0022  * 2. Redistributions in binary form must reproduce the above copyright
0023  *    notice, this list of conditions and the following disclaimer in the
0024  *    documentation and/or other materials provided with the distribution.
0025  *
0026  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
0027  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
0028  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
0029  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
0030  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
0031  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
0032  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
0033  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
0034  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
0035  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
0036  * POSSIBILITY OF SUCH DAMAGE.
0037  */
0038
0039 #ifdef HAVE_CONFIG_H
0040 #include "config.h"
0041 #endif
0042
0043 #include <rtems/posix/keyimpl.h>
0044
0045 /*
0046  *  17.1.2 Thread-Specific Data Management, P1003.1c/Draft 10, p. 165
0047  */
0048
0049 void *pthread_getspecific(
0050   pthread_key_t  key
0051 )
0052 {
0053   Thread_Control            *executing;
0054   ISR_lock_Context           lock_context;
0055   POSIX_Keys_Key_value_pair *key_value_pair;
0056   void                      *value;
0057
0058   executing = _Thread_Get_executing();
0059   _POSIX_Keys_Key_value_acquire( executing, &lock_context );
0060
0061   key_value_pair = _POSIX_Keys_Key_value_find( key, executing );
0062
0063   if ( key_value_pair != NULL ) {
0064     value = key_value_pair->value;
0065   } else {
0066     value = NULL;
0067   }
0068
0069   _POSIX_Keys_Key_value_release( executing, &lock_context );
0070
0071   return value;
0072 }