1/* pthread_getcpuclockid -- Get POSIX clockid_t for a pthread_t. Linux version
2 Copyright (C) 2000-2020 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public License as
7 published by the Free Software Foundation; either version 2.1 of the
8 License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; see the file COPYING.LIB. If
17 not, see <https://www.gnu.org/licenses/>. */
18
19#include <errno.h>
20#include <pthreadP.h>
21#include <sys/time.h>
22#include <tls.h>
23#include <kernel-posix-cpu-timers.h>
24
25
26int
27pthread_getcpuclockid (pthread_t threadid, clockid_t *clockid)
28{
29 struct pthread *pd = (struct pthread *) threadid;
30
31 /* Make sure the descriptor is valid. */
32 if (INVALID_TD_P (pd))
33 /* Not a valid thread handle. */
34 return ESRCH;
35
36 /* The clockid_t value is a simple computation from the TID. */
37
38 const clockid_t tidclock = MAKE_THREAD_CPUCLOCK (pd->tid, CPUCLOCK_SCHED);
39
40 *clockid = tidclock;
41 return 0;
42}
43