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

   1 /* Copyright (C) 2001 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, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #include <ucontext.h>
  21
  22 struct rv
  23   {
  24     long retval;
  25     long first_return;
  26   };
  27
  28 extern struct rv __getcontext (ucontext_t *__ucp) __THROW;
  29 extern int __setcontext (__const ucontext_t *__ucp) __THROW;
  30
  31 int
  32 __swapcontext (ucontext_t *oucp, const ucontext_t *ucp)
  33 {
  34   struct rv rv = __getcontext (oucp);
  35   if (rv.first_return)
  36     __setcontext (ucp);
  37   return 0;
  38 }
  39
  40 weak_alias (__swapcontext, swapcontext)