123 lines
4.5 KiB
C
123 lines
4.5 KiB
C
/****************************************************************************
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* sched/pthread/pthread_keycreate.c
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*
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* Copyright (C) 2007-2009, 2013 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 <assert.h>
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#include <debug.h>
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#include "sched/sched.h"
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#include "pthread/pthread.h"
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: 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 to all threads
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* in the system. Although the same key value may be used by different
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* threads, the values bound to the key by pthread_setspecific() are
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* maintained on a 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 the new key
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* in all active threads. Upon thread creation, the value NULL will be
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* associated with all 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 be associated
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* with each key that is invoked when a thread exits. However, this
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* argument is ignored in 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 store the newly
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* created key value at *key and return zero (OK). Otherwise, an error
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* number will bereturned to indicate the error:
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*
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* EAGAIN - The system lacked sufficient resources to create another
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* thread-specific data key, or the system-imposed limit on the total
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* number of keys 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 argument.
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*
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****************************************************************************/
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int pthread_key_create(FAR pthread_key_t *key,
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CODE void (*destructor)(FAR void *))
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{
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#if CONFIG_NPTHREAD_KEYS > 0
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FAR struct tcb_s *rtcb = this_task();
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FAR struct task_group_s *group = rtcb->group;
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int ret = EAGAIN;
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DEBUGASSERT(group);
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/* Check if we have exceeded the system-defined number of keys. */
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if (group->tg_nkeys < PTHREAD_KEYS_MAX)
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{
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/* Return the key value */
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*key = group->tg_nkeys;
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/* Increment the count of global keys. */
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group->tg_nkeys++;
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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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