| /* pthread_getcpuclockid -- Get POSIX clockid_t for a pthread_t. Linux version |
| Copyright (C) 2000,2001,2002,2003,2004,2005 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 <pthreadP.h> |
| #include <sys/time.h> |
| #include <tls.h> |
| #include <kernel-features.h> |
| #include <kernel-posix-cpu-timers.h> |
| |
| |
| #if !(__ASSUME_POSIX_CPU_TIMERS > 0) |
| int __libc_missing_posix_cpu_timers attribute_hidden; |
| #endif |
| #if !(__ASSUME_POSIX_TIMERS > 0) |
| int __libc_missing_posix_timers attribute_hidden; |
| #endif |
| |
| int |
| pthread_getcpuclockid (threadid, clockid) |
| pthread_t threadid; |
| clockid_t *clockid; |
| { |
| struct pthread *pd = (struct pthread *) threadid; |
| |
| /* Make sure the descriptor is valid. */ |
| if (INVALID_TD_P (pd)) |
| /* Not a valid thread handle. */ |
| return ESRCH; |
| |
| #ifdef __NR_clock_getres |
| /* The clockid_t value is a simple computation from the TID. |
| But we do a clock_getres call to validate it if we aren't |
| yet sure we have the kernel support. */ |
| |
| const clockid_t tidclock = MAKE_THREAD_CPUCLOCK (pd->tid, CPUCLOCK_SCHED); |
| |
| # if !(__ASSUME_POSIX_CPU_TIMERS > 0) |
| # if !(__ASSUME_POSIX_TIMERS > 0) |
| if (__libc_missing_posix_timers && !__libc_missing_posix_cpu_timers) |
| __libc_missing_posix_cpu_timers = 1; |
| # endif |
| if (!__libc_missing_posix_cpu_timers) |
| { |
| INTERNAL_SYSCALL_DECL (err); |
| int r = INTERNAL_SYSCALL (clock_getres, err, 2, tidclock, NULL); |
| if (!INTERNAL_SYSCALL_ERROR_P (r, err)) |
| # endif |
| { |
| *clockid = tidclock; |
| return 0; |
| } |
| |
| # if !(__ASSUME_POSIX_CPU_TIMERS > 0) |
| # if !(__ASSUME_POSIX_TIMERS > 0) |
| if (INTERNAL_SYSCALL_ERRNO (r, err) == ENOSYS) |
| { |
| /* The kernel doesn't support these calls at all. */ |
| __libc_missing_posix_timers = 1; |
| __libc_missing_posix_cpu_timers = 1; |
| } |
| else |
| # endif |
| if (INTERNAL_SYSCALL_ERRNO (r, err) == EINVAL) |
| { |
| /* The kernel doesn't support these clocks at all. */ |
| __libc_missing_posix_cpu_timers = 1; |
| } |
| else |
| return INTERNAL_SYSCALL_ERRNO (r, err); |
| } |
| # endif |
| #endif |
| |
| #ifdef CLOCK_THREAD_CPUTIME_ID |
| /* We need to store the thread ID in the CLOCKID variable together |
| with a number identifying the clock. We reserve the low 3 bits |
| for the clock ID and the rest for the thread ID. This is |
| problematic if the thread ID is too large. But 29 bits should be |
| fine. |
| |
| If some day more clock IDs are needed the ID part can be |
| enlarged. The IDs are entirely internal. */ |
| if (pd->tid >= 1 << (8 * sizeof (*clockid) - CLOCK_IDFIELD_SIZE)) |
| return ERANGE; |
| |
| /* Store the number. */ |
| *clockid = CLOCK_THREAD_CPUTIME_ID | (pd->tid << CLOCK_IDFIELD_SIZE); |
| |
| return 0; |
| #else |
| /* We don't have a timer for that. */ |
| return ENOENT; |
| #endif |
| } |