d1d46335df
Signed-off-by: anjiahao <anjiahao@xiaomi.com> Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>
116 lines
4.0 KiB
C
116 lines
4.0 KiB
C
/****************************************************************************
|
|
* libs/libc/pthread/pthread_keycreate.c
|
|
*
|
|
* Licensed to the Apache Software Foundation (ASF) under one or more
|
|
* contributor license agreements. See the NOTICE file distributed with
|
|
* this work for additional information regarding copyright ownership. The
|
|
* ASF licenses this file to you under the Apache License, Version 2.0 (the
|
|
* "License"); you may not use this file except in compliance with the
|
|
* License. You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
|
|
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
|
|
* License for the specific language governing permissions and limitations
|
|
* under the License.
|
|
*
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Included Files
|
|
****************************************************************************/
|
|
|
|
#include <nuttx/config.h>
|
|
|
|
#include <pthread.h>
|
|
#include <assert.h>
|
|
#include <errno.h>
|
|
|
|
#include <nuttx/mutex.h>
|
|
#include <nuttx/tls.h>
|
|
|
|
#if CONFIG_TLS_NELEM > 0
|
|
|
|
/****************************************************************************
|
|
* Public Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Name: 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 new key
|
|
* in all active threads. Upon thread creation, the value NULL will be
|
|
* associated with all defined keys in the new thread.
|
|
*
|
|
* Input 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.
|
|
*
|
|
* Returned 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
|
|
* ENOMEM - Insufficient memory exist to create the key.
|
|
*
|
|
****************************************************************************/
|
|
|
|
int pthread_key_create(FAR pthread_key_t *key,
|
|
CODE void (*destructor)(FAR void *))
|
|
{
|
|
FAR struct task_info_s *info = task_get_info();
|
|
int candidate;
|
|
int ret;
|
|
|
|
DEBUGASSERT(key != NULL);
|
|
DEBUGASSERT(info != NULL);
|
|
|
|
/* Search for an unused index. This is done in a critical section here to
|
|
* avoid concurrent modification of the group TLS index set.
|
|
*/
|
|
|
|
ret = nxmutex_lock(&info->ta_lock);
|
|
if (ret < 0)
|
|
{
|
|
return -ret;
|
|
}
|
|
|
|
ret = EAGAIN;
|
|
|
|
for (candidate = 0; candidate < CONFIG_TLS_NELEM; candidate++)
|
|
{
|
|
/* Is this candidate index available? */
|
|
|
|
tls_ndxset_t mask = (tls_ndxset_t)1 << candidate;
|
|
if ((info->ta_tlsset & mask) == 0)
|
|
{
|
|
/* Yes.. allocate the index and break out of the loop */
|
|
|
|
info->ta_tlsset |= mask;
|
|
info->ta_tlsdtor[candidate] = destructor;
|
|
*key = candidate;
|
|
ret = OK;
|
|
break;
|
|
}
|
|
}
|
|
|
|
nxmutex_unlock(&info->ta_lock);
|
|
return ret;
|
|
}
|
|
|
|
#endif /* CONFIG_TLS_NELEM */
|