ports/sysdeps/unix/sysv/linux/ia64/swapcontext.c

   1 /* Copyright (C) 2001-2014 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3      Contributed by David Mosberger-Tang <davidm@hpl.hp.com>.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the 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    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <ucontext.h>
  20
  21 struct rv
  22   {
  23     long retval;
  24     long first_return;
  25   };
  26
  27 extern struct rv __getcontext (ucontext_t *__ucp) __THROW;
  28 extern int __setcontext (const ucontext_t *__ucp) __THROW;
  29
  30 int
  31 __swapcontext (ucontext_t *oucp, const ucontext_t *ucp)
  32 {
  33   struct rv rv = __getcontext (oucp);
  34   if (rv.first_return)
  35     __setcontext (ucp);
  36   return 0;
  37 }
  38
  39 weak_alias (__swapcontext, swapcontext)