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141 lines
5.2 KiB
141 lines
5.2 KiB
/**************************************************************************** |
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* sched/pthread_keycreate.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 <spudmonkey@racsa.co.cr> |
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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 "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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* Function: pthread_key_create |
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* |
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* Description: |
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* This function creates a thread-specific data key visible |
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* to all threads in the system. Although the same key value |
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* may be used by different threads, the values bound to |
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* the key by pthread_setspecific() are maintained on a |
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* per-thread basis and persist for the life of the calling |
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* thread. |
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* |
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* Upon key creation, the value NULL will be associated with |
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* the new key in all active threads. Upon thread |
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* creation, the value NULL will be associated with all |
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* defined keys in the new thread. |
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* |
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* Parameters: |
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* key = A pointer to the key to create. |
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* destructor = An optional destructor() function that may |
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* be associated with each key that is invoked when a |
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* thread exits. However, this argument is ignored in |
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* the current implementation. |
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* |
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* Return Value: |
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* If successful, the pthread_key_create() function will |
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* store the newly created key value at *key and return |
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* zero (OK). Otherwise, an error number will be |
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* returned to indicate the error: |
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* |
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* EAGAIN - The system lacked sufficient resources |
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* to create another thread-specific data key, or the |
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* system-imposed limit on the total number of keys |
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* pers process {PTHREAD_KEYS_MAX} has been exceeded |
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* ENONMEM - Insufficient memory exists to create the key. |
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* |
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* Assumptions: |
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* |
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* POSIX Compatibility: |
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* - The present implementation ignores the destructor |
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* argument. |
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* |
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****************************************************************************/ |
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int pthread_key_create(FAR pthread_key_t *key, CODE void (*destructor)(void*)) |
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{ |
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#if CONFIG_NPTHREAD_KEYS > 0 |
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int ret = EAGAIN; |
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/* Check if we have exceeded the system-defined number of keys. */ |
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if (g_pthread_num_keys < PTHREAD_KEYS_MAX) |
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{ |
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/* Return the key value */ |
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*key = g_pthread_num_keys; |
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/* Increment the count of global keys. */ |
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g_pthread_num_keys++; |
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/* Return success. */ |
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ret = OK; |
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} |
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return ret; |
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#else |
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return ENOSYS; |
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#endif |
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}
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