mirror of
git://sourceware.org/git/glibc.git
synced 2024-12-15 04:20:28 +08:00
4165d44d70
* include/time.h: Define CLOCK_IDFIELD_SIZE. * sysdeps/posix/clock_getres.c: Recognize thread CPU clock IDs. * sysdeps/unix/clock_gettime.c: Likewise. * sysdeps/unix/clock_settime.c: Likewise. * sysdeps/unix/clock_nanosleep.c (CPUCLOCK_P): Adjust for new clock id for thread CPU clocks.
70 lines
2.2 KiB
C
70 lines
2.2 KiB
C
/* Copyright (C) 2001, 2002, 2003 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 <stdlib.h>
|
|
#include <time.h>
|
|
#include <libc-internal.h>
|
|
#include "pthreadP.h"
|
|
|
|
|
|
#if HP_TIMING_AVAIL
|
|
int
|
|
__pthread_clock_gettime (clockid_t clock_id, hp_timing_t freq,
|
|
struct timespec *tp)
|
|
{
|
|
hp_timing_t tsc;
|
|
|
|
/* Get the current counter. */
|
|
HP_TIMING_NOW (tsc);
|
|
|
|
/* This is the ID of the thread we are looking for. */
|
|
pid_t tid = ((unsigned int) clock_id) >> CLOCK_IDFIELD_SIZE;
|
|
|
|
/* Compute the offset since the start time of the process. */
|
|
if (tid == 0 || tid == THREAD_GETMEM (THREAD_SELF, tid))
|
|
/* Our own clock. */
|
|
tsc -= THREAD_GETMEM (THREAD_SELF, cpuclock_offset);
|
|
else
|
|
{
|
|
/* This is more complicated. We have to locate the thread based
|
|
on the ID. This means walking the list of existing
|
|
threads. */
|
|
struct pthread *thread = __find_thread_by_id (tid);
|
|
if (thread == NULL)
|
|
{
|
|
__set_errno (EINVAL);
|
|
return -1;
|
|
}
|
|
|
|
/* There is a race here. The thread might terminate and the stack
|
|
become unusable. But this is the user's problem. */
|
|
tsc -= thread->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
|