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
