libc/sysdeps/linux/nds32/swapcontext.c

   1 /* Copyright (C) 2001-2013 Free Software Foundation, Inc.
   2      Contributed by David Mosberger-Tang <davidm@hpl.hp.com>.
   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
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the 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; if not, see
  16    <http://www.gnu.org/licenses/>.  */
  17
  18 #include <ucontext.h>
  19
  20 struct rv
  21   {
  22     long retval;
  23     long first_return;
  24   };
  25
  26 extern struct rv __getcontext (ucontext_t *__ucp);
  27 extern int __setcontext (const ucontext_t *__ucp);
  28
  29 int
  30 __swapcontext (ucontext_t *oucp, const ucontext_t *ucp)
  31 {
  32   struct rv rv = __getcontext (oucp);
  33   if (rv.first_return)
  34     __setcontext (ucp);
  35   return 0;
  36 }
  37
  38 weak_alias (__swapcontext, swapcontext)