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/* Copyright (C) 2001, 2004 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public License as
published by the Free Software Foundation; either version 2.1 of the
License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; see the file COPYING.LIB. If not,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#include <errno.h>
#include <time.h>
#include <libc-internal.h>
#include "internals.h"
#include "spinlock.h"
#if HP_TIMING_AVAIL
int
__pthread_clock_gettime (clockid_t clock_id, hp_timing_t freq,
struct timespec *tp)
{
hp_timing_t tsc, cpuclock_offset;
pthread_descr self = thread_self ();
pthread_t thread = ((unsigned int) clock_id) >> CLOCK_IDFIELD_SIZE;
const unsigned int mask = ~0U >> CLOCK_IDFIELD_SIZE;
if (thread == 0 || (THREAD_GETMEM (self, p_tid) & mask) == thread)
cpuclock_offset = THREAD_GETMEM (self, p_cpuclock_offset);
else
{
pthread_descr th;
pthread_handle handle = thread_handle (thread);
__pthread_lock (&handle->h_lock, NULL);
th = handle->h_descr;
if (th == NULL || (th->p_tid & mask) != thread || th->p_terminated)
{
__pthread_unlock (&handle->h_lock);
__set_errno (EINVAL);
return -1;
}
cpuclock_offset = th->p_cpuclock_offset;
__pthread_unlock (&handle->h_lock);
}
/* Get the current counter. */
HP_TIMING_NOW (tsc);
/* Compute the offset since the start time of the process. */
tsc -= cpuclock_offset;
/* Compute the seconds. */
tp->tv_sec = tsc / freq;
/* And the nanoseconds. This computation should be stable until
we get machines with about 16GHz frequency. */
tp->tv_nsec = ((tsc % freq) * 1000000000ull) / freq;
return 0;
}
#endif
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