b08a86171f
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@3 42af7a65-404d-4744-a932-0658087f49c3
136 lines
4.9 KiB
C
136 lines
4.9 KiB
C
/************************************************************
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* pthread_keycreate.c
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*
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* Copyright (C) 2007 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 Gregory Nutt 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 <sys/types.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 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(pthread_key_t *key, void (*destructor)(void*))
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{
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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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}
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