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55 lines
1.8 KiB
C
55 lines
1.8 KiB
C
/* Copyright (C) 2000-2017 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 <pthreadP.h>
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#include <sys/time.h>
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#include <tls.h>
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int
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pthread_getcpuclockid (pthread_t threadid, clockid_t *clockid)
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{
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struct pthread *pd = (struct pthread *) threadid;
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/* Make sure the descriptor is valid. */
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if (INVALID_TD_P (pd))
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/* Not a valid thread handle. */
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return ESRCH;
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#ifdef CLOCK_THREAD_CPUTIME_ID
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/* We need to store the thread ID in the CLOCKID variable together
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with a number identifying the clock. We reserve the low 3 bits
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for the clock ID and the rest for the thread ID. This is
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problematic if the thread ID is too large. But 29 bits should be
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fine.
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If some day more clock IDs are needed the ID part can be
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enlarged. The IDs are entirely internal. */
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if (pd->tid >= 1 << (8 * sizeof (*clockid) - CLOCK_IDFIELD_SIZE))
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return ERANGE;
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/* Store the number. */
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*clockid = CLOCK_THREAD_CPUTIME_ID | (pd->tid << CLOCK_IDFIELD_SIZE);
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return 0;
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#else
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/* We don't have a timer for that. */
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return ENOENT;
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#endif
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}
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