libphobos/libdruntime/core/thread/context.d

   1 /**
   2  * The thread module provides support for thread creation and management.
   3  *
   4  * Copyright: Copyright Sean Kelly 2005 - 2012.
   5  * License: Distributed under the
   6  *      $(LINK2 http://www.boost.org/LICENSE_1_0.txt, Boost Software License 1.0).
   7  *    (See accompanying file LICENSE)
   8  * Authors:   Sean Kelly, Walter Bright, Alex Rønne Petersen, Martin Nowak
   9  * Source:    $(DRUNTIMESRC core/thread/context.d)
  10  */
  11
  12 module core.thread.context;
  13
  14 struct StackContext
  15 {
  16     void* bstack, tstack;
  17
  18     /// Slot for the EH implementation to keep some state for each stack
  19     /// (will be necessary for exception chaining, etc.). Opaque as far as
  20     /// we are concerned here.
  21     void* ehContext;
  22     StackContext* within;
  23     StackContext* next, prev;
  24 }
  25
  26 struct Callable
  27 {
  28     void opAssign(void function() fn) pure nothrow @nogc @safe
  29     {
  30         () @trusted { m_fn = fn; }();
  31         m_type = Call.FN;
  32     }
  33     void opAssign(void delegate() dg) pure nothrow @nogc @safe
  34     {
  35         () @trusted { m_dg = dg; }();
  36         m_type = Call.DG;
  37     }
  38     void opCall()
  39     {
  40         switch (m_type)
  41         {
  42             case Call.FN:
  43                 m_fn();
  44                 break;
  45             case Call.DG:
  46                 m_dg();
  47                 break;
  48             default:
  49                 break;
  50         }
  51     }
  52 private:
  53     enum Call
  54     {
  55         NO,
  56         FN,
  57         DG
  58     }
  59     Call m_type = Call.NO;
  60     union
  61     {
  62         void function() m_fn;
  63         void delegate() m_dg;
  64     }
  65 }