1 /* Copyright (C) 1999, 2000, 2001 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 Library General Public License as
6 published by the Free Software Foundation; either version 2 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 Library General Public License for more details.
14 You should have received a copy of the GNU Library 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. */
23 #include <libc-internal.h>
24 #include <hp-timing.h>
28 /* Clock frequency of the processor. We make it a 64-bit variable
29 because some jokers are already playing with processors with more
31 static hp_timing_t freq
;
34 /* We need the starting time for the process. */
35 extern hp_timing_t _dl_cpuclock_offset
;
38 /* This function is defined in the thread library. */
39 extern int __pthread_clock_gettime (hp_timing_t freq
, struct timespec
*tp
)
40 __attribute__ ((__weak__
));
44 /* Get current value of CLOCK and store it in TP. */
46 clock_gettime (clockid_t clock_id
, struct timespec
*tp
)
54 retval
= gettimeofday (&tv
, NULL
);
56 /* Convert into `timespec'. */
57 TIMEVAL_TO_TIMESPEC (&tv
, tp
);
61 case CLOCK_PROCESS_CPUTIME_ID
:
62 case CLOCK_THREAD_CPUTIME_ID
:
66 if (__builtin_expect (freq
== 0, 0))
68 /* This can only happen if we haven't initialized the `freq'
69 variable yet. Do this now. We don't have to protect this
70 code against multiple execution since all of them should
71 lead to the same result. */
72 freq
= __get_clockfreq ();
73 if (__builtin_expect (freq
== 0, 0))
74 /* Something went wrong. */
78 if (clock_id
== CLOCK_THREAD_CPUTIME_ID
79 && __pthread_clock_gettime
!= NULL
)
81 retval
= __pthread_clock_gettime (freq
, tp
);
85 /* Get the current counter. */
88 /* Compute the offset since the start time of the process. */
89 tsc
-= _dl_cpuclock_offset
;
91 /* Compute the seconds. */
92 tp
->tv_sec
= tsc
/ freq
;
94 /* And the nanoseconds. This computation should be stable until
95 we get machines with about 16GHz frequency. */
96 tp
->tv_nsec
= ((tsc
% freq
) * UINT64_C (1000000000)) / freq
;
104 __set_errno (EINVAL
);