Mercurial > hg > CbC > CbC_gcc
comparison gcc/ada/libgnarl/g-boumai.ads @ 111:04ced10e8804
gcc 7
| author | kono |
|---|---|
| date | Fri, 27 Oct 2017 22:46:09 +0900 |
| parents | |
| children | 84e7813d76e9 |
comparison
equal
deleted
inserted
replaced
| 68:561a7518be6b | 111:04ced10e8804 |
|---|---|
| 1 ------------------------------------------------------------------------------ | |
| 2 -- -- | |
| 3 -- GNAT LIBRARY COMPONENTS -- | |
| 4 -- -- | |
| 5 -- G N A T . B O U N D E D _ M A I L B O X E S -- | |
| 6 -- -- | |
| 7 -- S p e c -- | |
| 8 -- -- | |
| 9 -- Copyright (C) 2003-2017, AdaCore -- | |
| 10 -- -- | |
| 11 -- GNAT is free software; you can redistribute it and/or modify it under -- | |
| 12 -- terms of the GNU General Public License as published by the Free Soft- -- | |
| 13 -- ware Foundation; either version 3, or (at your option) any later ver- -- | |
| 14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- -- | |
| 15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY -- | |
| 16 -- or FITNESS FOR A PARTICULAR PURPOSE. -- | |
| 17 -- -- | |
| 18 -- As a special exception under Section 7 of GPL version 3, you are granted -- | |
| 19 -- additional permissions described in the GCC Runtime Library Exception, -- | |
| 20 -- version 3.1, as published by the Free Software Foundation. -- | |
| 21 -- -- | |
| 22 -- You should have received a copy of the GNU General Public License and -- | |
| 23 -- a copy of the GCC Runtime Library Exception along with this program; -- | |
| 24 -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see -- | |
| 25 -- <http://www.gnu.org/licenses/>. -- | |
| 26 -- -- | |
| 27 -- GNAT was originally developed by the GNAT team at New York University. -- | |
| 28 -- It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). -- | |
| 29 -- -- | |
| 30 ------------------------------------------------------------------------------ | |
| 31 | |
| 32 -- This package provides a thread-safe asynchronous communication facility | |
| 33 -- in the form of mailboxes. Individual mailbox objects are bounded in size | |
| 34 -- to a value specified by their Capacity discriminants. | |
| 35 | |
| 36 -- Mailboxes actually hold references to messages, not the message values | |
| 37 -- themselves. | |
| 38 | |
| 39 -- Type Mailbox is defined explicitly as a protected type (via derivation | |
| 40 -- from a protected type) so that clients may treat them accordingly (for | |
| 41 -- example, by making conditional/timed entry calls). | |
| 42 | |
| 43 with System; | |
| 44 with GNAT.Bounded_Buffers; | |
| 45 | |
| 46 generic | |
| 47 type Message (<>) is limited private; | |
| 48 type Message_Reference is access all Message; | |
| 49 -- Mailboxes hold references to Message values, of this type | |
| 50 | |
| 51 package GNAT.Bounded_Mailboxes is | |
| 52 pragma Preelaborate; | |
| 53 | |
| 54 package Message_Refs is | |
| 55 new GNAT.Bounded_Buffers (Message_Reference); | |
| 56 | |
| 57 type Mailbox is new Message_Refs.Bounded_Buffer; | |
| 58 | |
| 59 -- Type Mailbox has two inherited discriminants: | |
| 60 | |
| 61 -- Capacity : Positive; | |
| 62 -- Capacity is the maximum number of Message references | |
| 63 -- possibly contained at any given instant. | |
| 64 | |
| 65 -- Ceiling : System.Priority; | |
| 66 -- Users must specify the ceiling priority for the object. | |
| 67 -- If the Real-Time Systems Annex is not in use this value | |
| 68 -- is not important. | |
| 69 | |
| 70 -- Protected type Mailbox has the following inherited interface: | |
| 71 | |
| 72 -- entry Insert (Item : Message_Reference); | |
| 73 -- Insert Item into the Mailbox. Blocks caller | |
| 74 -- until space is available. | |
| 75 | |
| 76 -- entry Remove (Item : out Message_Reference); | |
| 77 -- Remove next available Message_Reference from Mailbox. | |
| 78 -- Blocks caller until a Message_Reference is available. | |
| 79 | |
| 80 -- function Empty return Boolean; | |
| 81 -- Returns whether the Mailbox contains any Message_References. | |
| 82 -- Note: State may change immediately after call returns. | |
| 83 | |
| 84 -- function Full return Boolean; | |
| 85 -- Returns whether any space remains within the Mailbox. | |
| 86 -- Note: State may change immediately after call returns. | |
| 87 | |
| 88 -- function Extent return Natural; | |
| 89 -- Returns the number of Message_Reference values currently held | |
| 90 -- within the Mailbox. | |
| 91 -- Note: State may change immediately after call returns. | |
| 92 | |
| 93 Default_Ceiling : constant System.Priority := Message_Refs.Default_Ceiling; | |
| 94 -- A convenience value for the Ceiling discriminant | |
| 95 | |
| 96 end GNAT.Bounded_Mailboxes; |