90 lines
2.9 KiB
C
90 lines
2.9 KiB
C
/****************************************************************************
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* libs/libc/tls/tls_free.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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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 <nuttx/spinlock.h>
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#include <nuttx/tls.h>
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#if CONFIG_TLS_NELEM > 0
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: tls_free
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*
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* Description:
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* Release a group-unique TLS data index previous obtained by tls_alloc()
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*
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* Input Parameters:
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* tlsindex - The previously allocated TLS index to be freed
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*
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* Returned Value:
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* OK is returned on success; a negated errno value will be returned and
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* set to errno on failure:
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*
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* -EINVAL - the index to be freed is out of range.
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* -EINTR - the wait operation interrupted by signal
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* -ECANCELED - the thread was canceled during waiting
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*
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****************************************************************************/
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int tls_free(int tlsindex)
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{
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FAR struct task_info_s *tinfo = task_get_info();
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tls_ndxset_t mask;
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int ret = -EINVAL;
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DEBUGASSERT((unsigned)tlsindex < CONFIG_TLS_NELEM && tinfo != NULL);
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if ((unsigned)tlsindex < CONFIG_TLS_NELEM)
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{
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/* This is done while holding a semaphore here to avoid concurrent
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* modification of the group TLS index set.
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*/
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mask = (1 << tlsindex);
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ret = _SEM_WAIT(&tinfo->ta_tlssem);
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if (OK == ret)
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{
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DEBUGASSERT((tinfo->ta_tlsset & mask) != 0);
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tinfo->ta_tlsset &= ~mask;
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_SEM_POST(&tinfo->ta_tlssem);
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}
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else
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{
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ret = -get_errno();
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}
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}
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return ret;
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}
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#endif /* CONFIG_TLS_NELEM > 0 */
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