04e760b1c2
There is no need for a gettid() syscall, as the thread ID is stable through the life of the process. It is safe to put a copy of TID to TLS. This way a user processes can access TID quickly via its own stack, instead of having to use an expensive syscall. Signed-off-by: Ville Juven <ville.juven@unikie.com>
56 lines
1.9 KiB
C
56 lines
1.9 KiB
C
/****************************************************************************
|
|
* libs/libc/sched/task_gettid.c
|
|
*
|
|
* SPDX-License-Identifier: Apache-2.0
|
|
*
|
|
* 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 <sys/types.h>
|
|
#include <unistd.h>
|
|
|
|
#include <nuttx/tls.h>
|
|
|
|
/****************************************************************************
|
|
* Public Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Name: gettid
|
|
*
|
|
* Description:
|
|
* Get the thread ID of the currently executing thread.
|
|
*
|
|
* Input parameters:
|
|
* None
|
|
*
|
|
* Returned Value:
|
|
* On success, returns the thread ID of the calling process.
|
|
*
|
|
****************************************************************************/
|
|
|
|
pid_t gettid(void)
|
|
{
|
|
FAR struct tls_info_s *tls = tls_get_info();
|
|
return tls->tl_tid;
|
|
}
|