0dedbcd4ae
This moves task / thread cancel point logic from the NuttX kernel into libc, while the data needed by the cancel point logic is moved to TLS. The change is an enabler to move user-space APIs to libc as well, for a coherent user/kernel separation.
75 lines
2.7 KiB
C
75 lines
2.7 KiB
C
/****************************************************************************
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* libs/libc/tls/tls_getinfo.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 <stdint.h>
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#include <assert.h>
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#include <nuttx/tls.h>
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#if !defined(up_tls_info) && (defined(__KERNEL__) || !defined(CONFIG_TLS_ALIGNED))
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: tls_get_info_pid
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*
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* Description:
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* Return a reference to the tls_info_s structure. This is used as part
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* of the internal implementation of tls_get/set_elem() and ONLY for the
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* where CONFIG_TLS_ALIGNED is *not* defined or __KERNEL__ is defined.
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*
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* Input Parameters:
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* pid - Thread ID to query, set to 0 to query own
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*
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* Returned Value:
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* A reference to the thread-specific tls_info_s structure is return on
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* success. NULL would be returned in the event of any failure.
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*
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****************************************************************************/
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FAR struct tls_info_s *tls_get_info_pid(pid_t pid)
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{
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FAR struct tls_info_s *info = NULL;
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struct stackinfo_s stackinfo;
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int ret;
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ret = nxsched_get_stackinfo(pid, &stackinfo);
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if (ret >= 0)
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{
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/* The TLS data lies at the lowest address of the stack allocation.
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* This is true for both push-up and push-down stacks.
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*/
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info = (FAR struct tls_info_s *)stackinfo.stack_alloc_ptr;
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}
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return info;
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}
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#endif /* !defined(up_tls_info) && (defined(__KERNEL__) || !defined(CONFIG_TLS_ALIGNED)) */
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