1/* Copyright (C) 2001-2019 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public License as
6 published by the Free Software Foundation; either version 2.1 of the
7 License, or (at your option) any later version.
8
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
13
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; see the file COPYING.LIB. If
16 not, see <http://www.gnu.org/licenses/>. */
17
18#include <errno.h>
19#include <stdlib.h>
20#include <time.h>
21#include "pthreadP.h"
22
23
24#if HP_TIMING_AVAIL
25int
26__pthread_clock_settime (clockid_t clock_id, hp_timing_t offset)
27{
28 /* This is the ID of the thread we are looking for. */
29 pid_t tid = ((unsigned int) clock_id) >> CLOCK_IDFIELD_SIZE;
30
31 /* Compute the offset since the start time of the process. */
32 if (tid == 0 || tid == THREAD_GETMEM (THREAD_SELF, tid))
33 /* Our own clock. */
34 THREAD_SETMEM (THREAD_SELF, cpuclock_offset, offset);
35 else
36 {
37 /* This is more complicated. We have to locate the thread based
38 on the ID. This means walking the list of existing
39 threads. */
40 struct pthread *thread = __find_thread_by_id (tid);
41 if (thread == NULL)
42 {
43 __set_errno (EINVAL);
44 return -1;
45 }
46
47 /* There is a race here. The thread might terminate and the stack
48 become unusable. But this is the user's problem. */
49 thread->cpuclock_offset = offset;
50 }
51
52 return 0;
53}
54#endif
55