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123 lines
4.4 KiB
123 lines
4.4 KiB
/************************************************************************ |
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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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