Package: Util.Tasking

Description

Copyright © 2002 by Thomas Wolf.
This piece of software is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2, or (at your option) any later version. This software is distributed in the hope that it will be useful, but without any warranty; without even the implied warranty of merchantability or fitness for a particular purpose. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License with this distribution, see file "GPL.txt". If not, write to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
As a special exception from the GPL, if other files instantiate generics from this unit, or you link this unit with other files to produce an executable, this unit does not by itself cause the resulting executable to be covered by the GPL. This exception does not however invalidate any other reasons why the executable file might be covered by the GPL.

Version: 1.1

Author:
Thomas Wolf (TW) <twolf AT acm DOT org>
Purpose:
Root package of the tasking utilities subsystem. Provides two generic packages for making arbitrary (constrained, non-limited) types task-safe.
Storage Semantics
No dynamic storage allocation.
Tasking Semantics
Fully task- and abortion-safe.

Header

package Util.Tasking is

 
pragma Elaborate_Body;

Known child units

Util.Tasking.Complex_Locks(package)
Util.Tasking.Conflict_Resolvers(package)
Util.Tasking.Locks(package)
Util.Tasking.Protectors(package)

Other Items:

generic
   type Item is private;
   Default : in Item;
package Protect is

Type Summary

Protected_Item (protected type)

Other Items:

protected type Protected_Item is

 
procedure Set (To : in Item);
function  Get return Item;
procedure Set_And_Get
  (New_Value : in     Item;
   Old_Value :    out Item);
private
Value : Item := Default;
end Protected_Item;
end Protect;
generic
   type Item is private;
   Default : in Item;
   with function "=" (Left, Right : in Item) return Boolean is <>;
package Protect_With_Wait is

Type Summary

Protected_Item (protected type)

Other Items:

protected type Protected_Item is

 
procedure Set (To : in Item);
function  Get return Item;
procedure Set_And_Get
  (New_Value : in     Item;
   Old_Value :    out Item);
entry Wait (Val : in Item);
Blocks until the protected item's value equals Val.
private
Value  : Item    := Default;
Change : Boolean := False;
entry Wait_Until (Boolean) (Val : in Item);
Active_Queue : Boolean := False;
end Protected_Item;
end Protect_With_Wait;
end Util.Tasking;
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