Update.
[glibc.git] / linuxthreads / ptclock_gettime.c
blob755f83d10147da6575a38b8c34bb1a9d661b2538
1 /* Copyright (C) 2001, 2004 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
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.
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.
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 not,
16 write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
17 Boston, MA 02111-1307, USA. */
19 #include <errno.h>
20 #include <time.h>
21 #include <libc-internal.h>
22 #include "internals.h"
23 #include "spinlock.h"
26 #if HP_TIMING_AVAIL
27 int
28 __pthread_clock_gettime (clockid_t clock_id, hp_timing_t freq,
29 struct timespec *tp)
31 hp_timing_t tsc, cpuclock_offset;
32 pthread_descr self = thread_self ();
33 pthread_t thread = ((unsigned int) clock_id) >> CLOCK_IDFIELD_SIZE;
34 const unsigned int mask = ~0U >> CLOCK_IDFIELD_SIZE;
36 if (thread == 0 || (THREAD_GETMEM (self, p_tid) & mask) == thread)
37 cpuclock_offset = THREAD_GETMEM (self, p_cpuclock_offset);
38 else
40 pthread_descr th;
41 pthread_handle handle = thread_handle (thread);
42 __pthread_lock (&handle->h_lock, NULL);
43 th = handle->h_descr;
44 if (th == NULL || (th->p_tid & mask) != thread || th->p_terminated)
46 __pthread_unlock (&handle->h_lock);
47 __set_errno (EINVAL);
48 return -1;
50 cpuclock_offset = th->p_cpuclock_offset;
51 __pthread_unlock (&handle->h_lock);
54 /* Get the current counter. */
55 HP_TIMING_NOW (tsc);
57 /* Compute the offset since the start time of the process. */
58 tsc -= cpuclock_offset;
60 /* Compute the seconds. */
61 tp->tv_sec = tsc / freq;
63 /* And the nanoseconds. This computation should be stable until
64 we get machines with about 16GHz frequency. */
65 tp->tv_nsec = ((tsc % freq) * 1000000000ull) / freq;
67 return 0;
69 #endif