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author | Ben Cheng <bccheng@google.com> | 2012-10-01 10:30:31 -0700 |
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committer | Ben Cheng <bccheng@google.com> | 2012-10-01 10:30:31 -0700 |
commit | 82bcbebce43f0227f506d75a5b764b6847041bae (patch) | |
tree | fe9f8597b48a430c4daeb5123e3e8eb28e6f9da9 /gcc-4.7/gcc/ada/a-cbprqu.ads | |
parent | 3c052de3bb16ac53b6b6ed659ec7557eb84c7590 (diff) | |
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Initial check-in of gcc 4.7.2.
Change-Id: I4a2f5a921c21741a0e18bda986d77e5f1bef0365
Diffstat (limited to 'gcc-4.7/gcc/ada/a-cbprqu.ads')
-rw-r--r-- | gcc-4.7/gcc/ada/a-cbprqu.ads | 137 |
1 files changed, 137 insertions, 0 deletions
diff --git a/gcc-4.7/gcc/ada/a-cbprqu.ads b/gcc-4.7/gcc/ada/a-cbprqu.ads new file mode 100644 index 000000000..aa184a1cc --- /dev/null +++ b/gcc-4.7/gcc/ada/a-cbprqu.ads @@ -0,0 +1,137 @@ +------------------------------------------------------------------------------ +-- -- +-- GNAT LIBRARY COMPONENTS -- +-- -- +-- ADA.CONTAINERS.BOUNDED_PRIORITY_QUEUES -- +-- -- +-- S p e c -- +-- -- +-- Copyright (C) 2011, Free Software Foundation, Inc. -- +-- -- +-- This specification is derived from the Ada Reference Manual for use with -- +-- GNAT. The copyright notice above, and the license provisions that follow -- +-- apply solely to the contents of the part following the private keyword. -- +-- -- +-- GNAT is free software; you can redistribute it and/or modify it under -- +-- terms of the GNU General Public License as published by the Free Soft- -- +-- ware Foundation; either version 3, or (at your option) any later ver- -- +-- sion. GNAT is distributed in the hope that it will be useful, but WITH- -- +-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY -- +-- or FITNESS FOR A PARTICULAR PURPOSE. -- +-- -- +-- As a special exception under Section 7 of GPL version 3, you are granted -- +-- additional permissions described in the GCC Runtime Library Exception, -- +-- version 3.1, as published by the Free Software Foundation. -- +-- -- +-- You should have received a copy of the GNU General Public License and -- +-- a copy of the GCC Runtime Library Exception along with this program; -- +-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see -- +-- <http://www.gnu.org/licenses/>. -- +-- -- +-- This unit was originally developed by Matthew J Heaney. -- +------------------------------------------------------------------------------ + +with System; + +with Ada.Containers.Synchronized_Queue_Interfaces; +with Ada.Containers.Bounded_Doubly_Linked_Lists; + +generic + with package Queue_Interfaces is + new Ada.Containers.Synchronized_Queue_Interfaces (<>); + + type Queue_Priority is private; + + with function Get_Priority + (Element : Queue_Interfaces.Element_Type) return Queue_Priority is <>; + + with function Before + (Left, Right : Queue_Priority) return Boolean is <>; + + Default_Capacity : Count_Type; + Default_Ceiling : System.Any_Priority := System.Priority'Last; + +package Ada.Containers.Bounded_Priority_Queues is + pragma Preelaborate; + + package Implementation is + + -- All identifiers in this unit are implementation defined + + pragma Implementation_Defined; + + type List_Type (Capacity : Count_Type) is tagged limited private; + + procedure Enqueue + (List : in out List_Type; + New_Item : Queue_Interfaces.Element_Type); + + procedure Dequeue + (List : in out List_Type; + Element : out Queue_Interfaces.Element_Type); + + procedure Dequeue + (List : in out List_Type; + At_Least : Queue_Priority; + Element : in out Queue_Interfaces.Element_Type; + Success : out Boolean); + + function First_Element + (List : List_Type) return Queue_Interfaces.Element_Type; + + function Length (List : List_Type) return Count_Type; + + function Max_Length (List : List_Type) return Count_Type; + + private + + -- We need a better data structure here, such as a proper heap. ??? + + package List_Types is new Bounded_Doubly_Linked_Lists + (Element_Type => Queue_Interfaces.Element_Type, + "=" => Queue_Interfaces."="); + + type List_Type (Capacity : Count_Type) is tagged limited record + Container : List_Types.List (Capacity); + Max_Length : Count_Type := 0; + end record; + + end Implementation; + + protected type Queue + (Capacity : Count_Type := Default_Capacity; + Ceiling : System.Any_Priority := Default_Ceiling) + with Priority => Ceiling is new Queue_Interfaces.Queue with + + overriding + entry Enqueue (New_Item : Queue_Interfaces.Element_Type); + + overriding + entry Dequeue (Element : out Queue_Interfaces.Element_Type); + + -- The priority queue operation Dequeue_Only_High_Priority had been a + -- protected entry in early drafts of AI05-0159, but it was discovered + -- that that operation as specified was not in fact implementable. The + -- operation was changed from an entry to a protected procedure per the + -- ARG meeting in Edinburgh (June 2011), with a different signature and + -- semantics. + + not overriding + procedure Dequeue_Only_High_Priority + (At_Least : Queue_Priority; + Element : in out Queue_Interfaces.Element_Type; + Success : out Boolean); + + overriding + function Current_Use return Count_Type; + + overriding + function Peak_Use return Count_Type; + + private + + List : Implementation.List_Type (Capacity); + + end Queue; + +end Ada.Containers.Bounded_Priority_Queues; |