124 lines
4.4 KiB
C
124 lines
4.4 KiB
C
/************************************************************************
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* sched/pthread_getspecific.c
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*
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* Copyright (C) 2007, 2009 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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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 <sched.h>
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#include <errno.h>
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#include <debug.h>
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#include "os_internal.h"
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#include "pthread_internal.h"
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/************************************************************************
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* Definitions
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************************************************************************/
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/************************************************************************
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* Private Type Declarations
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************************************************************************/
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/************************************************************************
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* Global Variables
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************************************************************************/
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/************************************************************************
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* Private Variables
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************************************************************************/
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/************************************************************************
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* Private Functions
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************************************************************************/
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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 with a key value
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* not obtained from pthread_create() or after a key has been deleted
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* with pthread_key_delete() is undefined.
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*
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* Parameters:
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* key = The data key to get or set
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*
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* Return 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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* EINVAL - The key value is invalid.
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*
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* Assumptions:
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*
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* POSIX Compatibility:
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* - Both calling pthread_setspecific() and pthread_getspecific()
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* may be called from a thread-specific data destructor
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* 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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#if CONFIG_NPTHREAD_KEYS > 0
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FAR _TCB *rtcb = (FAR _TCB*)g_readytorun.head;
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FAR void *ret = NULL;
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/* Check if the key is valid. */
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if (key < g_pthread_num_keys)
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{
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/* Return the stored value. */
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ret = rtcb->pthread_data[key];
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}
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return ret;
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#else
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return NULL;
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#endif
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}
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