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glibc  2.9
ucontext.h
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00001 /* Copyright (C) 1997, 1998, 1999, 2000 Free Software Foundation, Inc.
00002    This file is part of the GNU C Library.
00003 
00004    The GNU C Library is free software; you can redistribute it and/or
00005    modify it under the terms of the GNU Lesser General Public
00006    License as published by the Free Software Foundation; either
00007    version 2.1 of the License, or (at your option) any later version.
00008 
00009    The GNU C Library is distributed in the hope that it will be useful,
00010    but WITHOUT ANY WARRANTY; without even the implied warranty of
00011    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00012    Lesser General Public License for more details.
00013 
00014    You should have received a copy of the GNU Lesser General Public
00015    License along with the GNU C Library; if not, write to the Free
00016    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00017    02111-1307 USA.  */
00018 
00019 /* System V ABI compliant user-level context switching support.  */
00020 
00021 #ifndef _UCONTEXT_H
00022 #define _UCONTEXT_H  1
00023 
00024 #include <features.h>
00025 
00026 /* Get machine dependent definition of data structures.  */
00027 #include <sys/ucontext.h>
00028 
00029 __BEGIN_DECLS
00030 
00031 /* Get user context and store it in variable pointed to by UCP.  */
00032 extern int getcontext (ucontext_t *__ucp) __THROW;
00033 
00034 /* Set user context from information of variable pointed to by UCP.  */
00035 extern int setcontext (__const ucontext_t *__ucp) __THROW;
00036 
00037 /* Save current context in context variable pointed to by OUCP and set
00038    context from variable pointed to by UCP.  */
00039 extern int swapcontext (ucontext_t *__restrict __oucp,
00040                      __const ucontext_t *__restrict __ucp) __THROW;
00041 
00042 /* Manipulate user context UCP to continue with calling functions FUNC
00043    and the ARGC-1 parameters following ARGC when the context is used
00044    the next time in `setcontext' or `swapcontext'.
00045 
00046    We cannot say anything about the parameters FUNC takes; `void'
00047    is as good as any other choice.  */
00048 extern void makecontext (ucontext_t *__ucp, void (*__func) (void),
00049                       int __argc, ...) __THROW;
00050 
00051 __END_DECLS
00052 
00053 #endif /* ucontext.h */