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111 lines
3.4 KiB
C
111 lines
3.4 KiB
C
/* pthread_getcpuclockid -- Get POSIX clockid_t for a pthread_t. Linux version
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Copyright (C) 2000,2001,2002,2003,2004,2005 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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#include <kernel-features.h>
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#include <kernel-posix-cpu-timers.h>
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#if !(__ASSUME_POSIX_CPU_TIMERS > 0)
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int __libc_missing_posix_cpu_timers attribute_hidden;
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#endif
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#if !(__ASSUME_POSIX_TIMERS > 0)
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int __libc_missing_posix_timers attribute_hidden;
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#endif
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int
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pthread_getcpuclockid (threadid, clockid)
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pthread_t threadid;
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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 __NR_clock_getres
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/* The clockid_t value is a simple computation from the TID.
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But we do a clock_getres call to validate it if we aren't
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yet sure we have the kernel support. */
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const clockid_t tidclock = MAKE_THREAD_CPUCLOCK (pd->tid, CPUCLOCK_SCHED);
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# if !(__ASSUME_POSIX_CPU_TIMERS > 0)
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# if !(__ASSUME_POSIX_TIMERS > 0)
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if (__libc_missing_posix_timers && !__libc_missing_posix_cpu_timers)
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__libc_missing_posix_cpu_timers = 1;
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# endif
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if (!__libc_missing_posix_cpu_timers)
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{
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INTERNAL_SYSCALL_DECL (err);
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int r = INTERNAL_SYSCALL (clock_getres, err, 2, tidclock, NULL);
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if (!INTERNAL_SYSCALL_ERROR_P (r, err))
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# endif
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{
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*clockid = tidclock;
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return 0;
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}
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# if !(__ASSUME_POSIX_CPU_TIMERS > 0)
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# if !(__ASSUME_POSIX_TIMERS > 0)
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if (INTERNAL_SYSCALL_ERRNO (r, err) == ENOSYS)
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{
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/* The kernel doesn't support these calls at all. */
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__libc_missing_posix_timers = 1;
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__libc_missing_posix_cpu_timers = 1;
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}
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else
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# endif
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if (INTERNAL_SYSCALL_ERRNO (r, err) == EINVAL)
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{
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/* The kernel doesn't support these clocks at all. */
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__libc_missing_posix_cpu_timers = 1;
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}
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else
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return INTERNAL_SYSCALL_ERRNO (r, err);
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}
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# endif
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#endif
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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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