1358cc1911
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@592 42af7a65-404d-4744-a932-0658087f49c3
142 lines
5.2 KiB
C
142 lines
5.2 KiB
C
/****************************************************************************
|
|
* pthread_keycreate.c
|
|
*
|
|
* Copyright (C) 2007, 2008 Gregory Nutt. All rights reserved.
|
|
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
*
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in
|
|
* the documentation and/or other materials provided with the
|
|
* distribution.
|
|
* 3. Neither the name NuttX nor the names of its contributors may be
|
|
* used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
|
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
|
|
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
|
|
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
|
|
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
|
|
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
|
|
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
|
|
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
* POSSIBILITY OF SUCH DAMAGE.
|
|
*
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Included Files
|
|
****************************************************************************/
|
|
|
|
#include <nuttx/config.h>
|
|
|
|
#include <sys/types.h>
|
|
#include <sched.h>
|
|
#include <errno.h>
|
|
#include <debug.h>
|
|
#include "pthread_internal.h"
|
|
|
|
/****************************************************************************
|
|
* Definitions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Private Type Declarations
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Global Variables
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Private Variables
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Private Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Public Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Function: pthread_key_create
|
|
*
|
|
* Description:
|
|
* This function creates a thread-specific data key visible
|
|
* to all threads in the system. Although the same key value
|
|
* may be used by different threads, the values bound to
|
|
* the key by pthread_setspecific() are maintained on a
|
|
* per-thread basis and persist for the life of the calling
|
|
* thread.
|
|
*
|
|
* Upon key creation, the value NULL will be associated with
|
|
* the the new key in all active threads. Upon thread
|
|
* creation, the value NULL will be associated with all
|
|
* defined keys in the new thread.
|
|
*
|
|
* Parameters:
|
|
* key = A pointer to the key to create.
|
|
* destructor = An optional destructor() function that may
|
|
* be associated with each key that is invoked when a
|
|
* thread exits. However, this argument is ignored in
|
|
* the current implementation.
|
|
*
|
|
* Return Value:
|
|
* If successful, the pthread_key_create() function will
|
|
* store the newly created key value at *key and return
|
|
* zero (OK). Otherwise, an error number will be
|
|
* returned to indicate the error:
|
|
*
|
|
* EAGAIN - The system lacked sufficient resources
|
|
* to create another thread-specific data key, or the
|
|
* system-imposed limit on the total number of keys
|
|
* pers process {PTHREAD_KEYS_MAX} has been exceeded
|
|
* ENONMEM - Insufficient memory exists to create the key.
|
|
*
|
|
* Assumptions:
|
|
*
|
|
* POSIX Compatibility:
|
|
* - The present implementation ignores the destructor
|
|
* argument.
|
|
*
|
|
****************************************************************************/
|
|
|
|
int pthread_key_create(FAR pthread_key_t *key, CODE void (*destructor)(void*))
|
|
{
|
|
#if CONFIG_NPTHREAD_KEYS > 0
|
|
int ret = EAGAIN;
|
|
|
|
/* Check if we have exceeded the system-defined number of keys. */
|
|
|
|
if (g_pthread_num_keys < PTHREAD_KEYS_MAX)
|
|
{
|
|
/* Return the key value */
|
|
|
|
*key = g_pthread_num_keys;
|
|
|
|
/* Increment the count of global keys. */
|
|
|
|
g_pthread_num_keys++;
|
|
|
|
/* Return success. */
|
|
|
|
ret = OK;
|
|
}
|
|
|
|
return ret;
|
|
#else
|
|
return ENOSYS;
|
|
#endif
|
|
}
|