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69 lines
2.1 KiB
C
69 lines
2.1 KiB
C
/* Copyright (C) 2001-2014 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public License as
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published by the Free Software Foundation; either version 2.1 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; see the file COPYING.LIB. If
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not, see <http://www.gnu.org/licenses/>. */
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#include <errno.h>
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#include <stdlib.h>
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#include <time.h>
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#include <libc-internal.h>
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#include "pthreadP.h"
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#if HP_TIMING_AVAIL
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int
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__pthread_clock_gettime (clockid_t clock_id, hp_timing_t freq,
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struct timespec *tp)
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{
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hp_timing_t tsc;
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/* Get the current counter. */
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HP_TIMING_NOW (tsc);
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/* This is the ID of the thread we are looking for. */
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pid_t tid = ((unsigned int) clock_id) >> CLOCK_IDFIELD_SIZE;
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/* Compute the offset since the start time of the process. */
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if (tid == 0 || tid == THREAD_GETMEM (THREAD_SELF, tid))
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/* Our own clock. */
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tsc -= THREAD_GETMEM (THREAD_SELF, cpuclock_offset);
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else
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{
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/* This is more complicated. We have to locate the thread based
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on the ID. This means walking the list of existing
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threads. */
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struct pthread *thread = __find_thread_by_id (tid);
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if (thread == NULL)
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{
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__set_errno (EINVAL);
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return -1;
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}
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/* There is a race here. The thread might terminate and the stack
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become unusable. But this is the user's problem. */
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tsc -= thread->cpuclock_offset;
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}
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/* Compute the seconds. */
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tp->tv_sec = tsc / freq;
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/* And the nanoseconds. This computation should be stable until
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we get machines with about 16GHz frequency. */
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tp->tv_nsec = ((tsc % freq) * 1000000000ull) / freq;
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return 0;
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}
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#endif
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