stdlib/ucontext.h

   1 /* Copyright (C) 1997 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 Library General Public License as
   6    published by the Free Software Foundation; either version 2 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    Library General Public License for more details.
  13
  14    You should have received a copy of the GNU Library 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 /* System V ABI compliant user-level context switching support.  */
  20
  21 #ifndef _UCONTEXT_H
  22 #define _UCONTEXT_H     1
  23
  24 #include <features.h>
  25
  26 /* Get machine dependent definition of data structures.  */
  27 #include <sys/ucontext.h>
  28
  29 __BEGIN_DECLS
  30
  31 /* Get user context and store it in variable pointed to by UCP.  */
  32 extern int getcontext __P ((ucontext_t *__ucp));
  33
  34 /* Set user context from information of variable pointed to by UCP.  */
  35 extern int setcontext __P ((ucontext_t *__ucp));
  36
  37 /* Save current context in context variable pointed to by OUCP and set
  38    context from variable pointed to by UCP.  */
  39 extern int swapcontext __P ((ucontext_t *__oucp, ucontext_t *__ucp));
  40
  41 /* Manipulate user context UCP to continue with calling functions FUNC
  42    and the ARGC-1 parameters following ARGC when the context is used
  43    the next time in `setcontext' or `swapcontext'.
  44
  45    We cannot say anything about the parameters FUNC takes; `void'
  46    is as good as any other choice.  */
  47 extern void makecontext __P ((ucontext_t *__ucp, void (*__func) __P ((void)),
  48                               int __argc, ...));
  49
  50 __END_DECLS
  51
  52 #endif /* ucontext.h */