sysdeps/unix/sysv/linux/default-sched.h

   1 /* Determine calling thread's scheduling parameters.  Linux version.
   2    Copyright (C) 2014-2018 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Library General Public License as
   7    published by the Free Software Foundation; either version 2 of the
   8    License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Library General Public License for more details.
  14
  15    You should have received a copy of the GNU Library General Public
  16    License along with the GNU C Library; see the file COPYING.LIB.  If
  17    not, see <http://www.gnu.org/licenses/>.  */
  18
  19 #include <sysdep.h>
  20
  21 /* This should fill in PD->schedpolicy if PD->flags does not contain
  22    ATTR_FLAG_POLICY_SET, and set it; and PD->schedparam if PD->flags does
  23    not contain ATTR_FLAG_SCHED_SET, and set it.  It won't be called at all
  24    if both bits are already set.  */
  25
  26 static void
  27 collect_default_sched (struct pthread *pd)
  28 {
  29   INTERNAL_SYSCALL_DECL (scerr);
  30
  31   if ((pd->flags & ATTR_FLAG_POLICY_SET) == 0)
  32     {
  33       pd->schedpolicy = INTERNAL_SYSCALL (sched_getscheduler, scerr, 1, 0);
  34       pd->flags |= ATTR_FLAG_POLICY_SET;
  35     }
  36
  37   if ((pd->flags & ATTR_FLAG_SCHED_SET) == 0)
  38     {
  39       INTERNAL_SYSCALL (sched_getparam, scerr, 2, 0, &pd->schedparam);
  40       pd->flags |= ATTR_FLAG_SCHED_SET;
  41     }
  42 }