85 lines
2.9 KiB
C
85 lines
2.9 KiB
C
/****************************************************************************
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* libs/libc/pthread/pthread_getspecific.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <pthread.h>
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#include <assert.h>
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#include <nuttx/tls.h>
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#if CONFIG_TLS_NELEM > 0
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: pthread_getspecific
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*
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* Description:
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* The pthread_getspecific() function returns the value currently
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* bound to the specified key on behalf of the calling thread.
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*
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* The effect of calling pthread_getspecific() with a key value
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* not obtained from pthread_key_create() or after a key has been
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* deleted with pthread_key_delete() is undefined.
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*
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* Input Parameters:
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* key = The data key to get or set
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*
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* Returned Value:
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* The function pthread_getspecific() returns the thread-specific data
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* associated with the given key. If no thread specific data is
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* associated with the key, then the value NULL is returned.
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*
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* POSIX Compatibility:
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* - Both pthread_setspecific() and pthread_getspecific() may be
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* called from a thread-specific data destructor function.
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*
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****************************************************************************/
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FAR void *pthread_getspecific(pthread_key_t key)
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{
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FAR struct tls_info_s *info;
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FAR void *ret = NULL;
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DEBUGASSERT(key >= 0 && key < CONFIG_TLS_NELEM);
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if (key >= 0 && key < CONFIG_TLS_NELEM)
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{
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/* Get the TLS info structure from the current threads stack */
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info = tls_get_info();
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DEBUGASSERT(info != NULL);
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/* Get the element value from the TLS info. */
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ret = (FAR void *)info->tl_elem[key];
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}
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return ret;
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}
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#endif /* CONFIG_TLS_NELEM */
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