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      1 /* Copyright (C) 1997, 1998, 1999, 2000 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 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, write to the Free
     16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
     17    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 (ucontext_t *__ucp) __THROW;
     33 
     34 /* Set user context from information of variable pointed to by UCP.  */
     35 extern int setcontext (__const ucontext_t *__ucp) __THROW;
     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 (ucontext_t *__restrict __oucp,
     40 			__const ucontext_t *__restrict __ucp) __THROW;
     41 
     42 /* Manipulate user context UCP to continue with calling functions FUNC
     43    and the ARGC-1 parameters following ARGC when the context is used
     44    the next time in `setcontext' or `swapcontext'.
     45 
     46    We cannot say anything about the parameters FUNC takes; `void'
     47    is as good as any other choice.  */
     48 extern void makecontext (ucontext_t *__ucp, void (*__func) (void),
     49 			 int __argc, ...) __THROW;
     50 
     51 __END_DECLS
     52 
     53 #endif /* ucontext.h */
     54