1 | /* Copyright (C) 2001-2016 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 <libc-internal.h> |
22 | #include "pthreadP.h" |
23 | |
24 | |
25 | #if HP_TIMING_AVAIL |
26 | int |
27 | __pthread_clock_settime (clockid_t clock_id, hp_timing_t offset) |
28 | { |
29 | /* This is the ID of the thread we are looking for. */ |
30 | pid_t tid = ((unsigned int) clock_id) >> CLOCK_IDFIELD_SIZE; |
31 | |
32 | /* Compute the offset since the start time of the process. */ |
33 | if (tid == 0 || tid == THREAD_GETMEM (THREAD_SELF, tid)) |
34 | /* Our own clock. */ |
35 | THREAD_SETMEM (THREAD_SELF, cpuclock_offset, offset); |
36 | else |
37 | { |
38 | /* This is more complicated. We have to locate the thread based |
39 | on the ID. This means walking the list of existing |
40 | threads. */ |
41 | struct pthread *thread = __find_thread_by_id (tid); |
42 | if (thread == NULL) |
43 | { |
44 | __set_errno (EINVAL); |
45 | return -1; |
46 | } |
47 | |
48 | /* There is a race here. The thread might terminate and the stack |
49 | become unusable. But this is the user's problem. */ |
50 | thread->cpuclock_offset = offset; |
51 | } |
52 | |
53 | return 0; |
54 | } |
55 | #endif |
56 | |