nuttx/libs/libc/tls/tls_getelem.c

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/****************************************************************************
* libs/libc/fixedmath/tls_getelem.c
*
* Copyright (C) 2016 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* 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.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* 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.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <stdint.h>
#include <assert.h>
#include <nuttx/arch.h>
#include <nuttx/tls.h>
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#include <arch/tls.h>
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#ifdef CONFIG_TLS
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: tls_get_element
*
* Description:
* Return an the TLS element associated with the 'elem' index
*
* Input Parameters:
* elem - Index of TLS element to return
*
* Returned Value:
* The value of TLS element associated with 'elem'. Errors are not reported.
* Aero is returned in the event of an error, but zero may also be valid
* value and returned when there is no error. The only possible error would
* be if elem >=CONFIG_TLS_NELEM.
*
****************************************************************************/
uintptr_t tls_get_element(int elem)
{
FAR struct tls_info_s *info;
uintptr_t ret = 0;
DEBUGASSERT(elem >= 0 && elem < CONFIG_TLS_NELEM);
if (elem >= 0 && elem < CONFIG_TLS_NELEM)
{
/* Get the TLS info structure from the current threads stack */
info = up_tls_info();
DEBUGASSERT(info != NULL);
/* Get the element value from the TLS info. */
ret = info->tl_elem[elem];
}
return ret;
}
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#endif /* CONFIG_TLS */