nuttx/sched/task/task_tls_alloc.c
2023-08-05 06:33:49 -07:00

143 lines
3.9 KiB
C

/****************************************************************************
* sched/task/task_tls_alloc.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 <sys/types.h>
#include <unistd.h>
#include <sched.h>
#include <errno.h>
#include <nuttx/tls.h>
#include <nuttx/mutex.h>
/****************************************************************************
* Private Data
****************************************************************************/
#if CONFIG_TLS_TASK_NELEM > 0
static mutex_t g_tlslock = NXMUTEX_INITIALIZER;
static tls_dtor_t g_tlsdtor[CONFIG_TLS_TASK_NELEM];
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: tls_dtor
****************************************************************************/
static void tls_dtor(FAR void *arg)
{
UNUSED(arg);
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: task_tls_allocs
*
* Description:
* Allocate a global-unique task local storage data index
*
* Input Parameters:
* dtor - The destructor of task local storage data element
*
* Returned Value:
* A TLS index that is unique.
*
****************************************************************************/
int task_tls_alloc(tls_dtor_t dtor)
{
int ret;
int candidate;
ret = nxmutex_lock(&g_tlslock);
if (ret < 0)
{
return ret;
}
ret = -EUSERS;
for (candidate = 0; candidate < CONFIG_TLS_TASK_NELEM; candidate++)
{
if (g_tlsdtor[candidate] == NULL)
{
if (dtor)
{
g_tlsdtor[candidate] = dtor;
}
else
{
g_tlsdtor[candidate] = tls_dtor;
}
ret = candidate;
break;
}
}
nxmutex_unlock(&g_tlslock);
return ret;
}
/****************************************************************************
* Name: task_tls_destruct
*
* Description:
* Destruct all TLS data element associated with allocated key
*
* Input Parameters:
* None
*
* Returned Value:
* None
*
****************************************************************************/
void task_tls_destruct(void)
{
int candidate;
uintptr_t elem;
tls_dtor_t dtor;
FAR struct task_info_s *info = task_get_info();
for (candidate = CONFIG_TLS_TASK_NELEM - 1; candidate >= 0; candidate--)
{
elem = info->ta_telem[candidate];
dtor = g_tlsdtor[candidate];
if (dtor != NULL && elem != 0)
{
dtor((FAR void *)elem);
}
info->ta_telem[candidate] = 0;
}
}
#endif