continuation.h

   1 /*
   2  * GTK VNC Widget
   3  *
   4  * Copyright (C) 2006  Anthony Liguori <anthony@codemonkey.ws>
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.0 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301 USA
  19  */
  20
  21 #ifndef _CONTINUATION_H_
  22 #define _CONTINUATION_H_
  23
  24 #include <ucontext.h>
  25
  26 struct continuation
  27 {
  28         char *stack;
  29         size_t stack_size;
  30         void (*entry)(struct continuation *cc);
  31         int (*release)(struct continuation *cc);
  32
  33         /* private */
  34         ucontext_t uc;
  35         ucontext_t last;
  36         int exited;
  37 };
  38
  39 int cc_init(struct continuation *cc);
  40
  41 int cc_release(struct continuation *cc);
  42
  43 /* you can use an uninitialized struct continuation for from if you do not have
  44    the current continuation handy. */
  45 int cc_swap(struct continuation *from, struct continuation *to);
  46
  47 #define offset_of(type, member) ((unsigned long)(&((type *)0)->member))
  48 #ifndef container_of
  49 #define container_of(obj, type, member) \
  50         (type *)(((char *)obj) - offset_of(type, member))
  51 #endif
  52
  53 #endif
  54 /*
  55  * Local variables:
  56  *  c-indent-level: 8
  57  *  c-basic-offset: 8
  58  *  tab-width: 8
  59  * End:
  60  */