linuxthreads/ptclock_settime.c

   1 /* Copyright (C) 2001, 2004 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public License as
   6    published by the Free Software Foundation; either version 2.1 of the
   7    License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  16    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17    Boston, MA 02111-1307, USA.  */
  18
  19 #include <errno.h>
  20 #include <time.h>
  21 #include <libc-internal.h>
  22 #include "internals.h"
  23 #include "spinlock.h"
  24
  25
  26 #if HP_TIMING_AVAIL
  27 int
  28 __pthread_clock_settime (clockid_t clock_id, hp_timing_t offset)
  29 {
  30   pthread_descr self = thread_self ();
  31   pthread_t thread = ((unsigned int) clock_id) >> CLOCK_IDFIELD_SIZE;
  32   const unsigned int mask = ~0U >> CLOCK_IDFIELD_SIZE;
  33
  34   if (thread == 0 || (THREAD_GETMEM (self, p_tid) & mask) == thread)
  35     /* Our own clock.  */
  36     THREAD_SETMEM (self, p_cpuclock_offset, offset);
  37   else
  38     {
  39       pthread_descr th;
  40       pthread_handle handle = thread_handle (thread);
  41       __pthread_lock (&handle->h_lock, NULL);
  42       th = handle->h_descr;
  43       if (th == NULL || (th->p_tid & mask) != thread || th->p_terminated)
  44         {
  45           __pthread_unlock (&handle->h_lock);
  46           __set_errno (EINVAL);
  47           return -1;
  48         }
  49       th->p_cpuclock_offset = offset;
  50       __pthread_unlock (&handle->h_lock);
  51    }
  52
  53   return 0;
  54 }
  55 #endif