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b168057a | 1 | /* Copyright (C) 2001-2015 Free Software Foundation, Inc. |
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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 | |
59ba27a6 PE |
15 | License along with the GNU C Library; see the file COPYING.LIB. If |
16 | not, see <http://www.gnu.org/licenses/>. */ | |
76a50749 | 17 | |
4165d44d | 18 | #include <errno.h> |
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19 | #include <stdlib.h> |
20 | #include <time.h> | |
21 | #include <libc-internal.h> | |
22 | #include "pthreadP.h" | |
23 | ||
24 | ||
25 | #if HP_TIMING_AVAIL | |
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26 | int |
27 | __pthread_clock_settime (clockid_t clock_id, hp_timing_t offset) | |
76a50749 | 28 | { |
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29 | /* This is the ID of the thread we are looking for. */ |
30 | pid_t tid = ((unsigned int) clock_id) >> CLOCK_IDFIELD_SIZE; | |
31 | ||
76a50749 | 32 | /* Compute the offset since the start time of the process. */ |
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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; | |
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54 | } |
55 | #endif |