gcc/ada/s-tasque.ads

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                 GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS                 --
   4 --                                                                          --
   5 --                 S Y S T E M . T A S K I N G . Q U E U I N G              --
   6 --                                                                          --
   7 --                                  S p e c                                 --
   8 --                                                                          --
   9 --         Copyright (C) 1992-2006, Free Software Foundation, Inc.          --
  10 --                                                                          --
  11 -- GNARL 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 2,  or (at your option) any later ver- --
  14 -- sion. GNARL 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.  See the GNU General Public License --
  17 -- for  more details.  You should have  received  a copy of the GNU General --
  18 -- Public License  distributed with GNARL; see file COPYING.  If not, write --
  19 -- to  the  Free Software Foundation,  51  Franklin  Street,  Fifth  Floor, --
  20 -- Boston, MA 02110-1301, USA.                                              --
  21 --                                                                          --
  22 -- As a special exception,  if other files  instantiate  generics from this --
  23 -- unit, or you link  this unit with other files  to produce an executable, --
  24 -- this  unit  does not  by itself cause  the resulting  executable  to  be --
  25 -- covered  by the  GNU  General  Public  License.  This exception does not --
  26 -- however invalidate  any other reasons why  the executable file  might be --
  27 -- covered by the  GNU Public License.                                      --
  28 --                                                                          --
  29 -- GNARL was developed by the GNARL team at Florida State University.       --
  30 -- Extensive contributions were provided by Ada Core Technologies, Inc.     --
  31 --                                                                          --
  32 ------------------------------------------------------------------------------
  33
  34 with System.Tasking.Protected_Objects.Entries;
  35
  36 package System.Tasking.Queuing is
  37
  38    package POE renames System.Tasking.Protected_Objects.Entries;
  39
  40    procedure Broadcast_Program_Error
  41      (Self_ID      : Task_Id;
  42       Object       : POE.Protection_Entries_Access;
  43       Pending_Call : Entry_Call_Link;
  44       RTS_Locked   : Boolean := False);
  45    --  Raise Program_Error in all tasks calling the protected entries of Object
  46    --  The exception will not be raised immediately for the calling task; it
  47    --  will be deferred until it calls Check_Exception.
  48    --  RTS_Locked indicates whether the global RTS lock is taken (only
  49    --  relevant if Single_Lock is True).
  50
  51    procedure Enqueue (E : in out Entry_Queue; Call : Entry_Call_Link);
  52    --  Enqueue Call at the end of entry_queue E
  53
  54    procedure Dequeue (E : in out Entry_Queue; Call : Entry_Call_Link);
  55    --  Dequeue Call from entry_queue E
  56
  57    function Head (E : Entry_Queue) return Entry_Call_Link;
  58    pragma Inline (Head);
  59    --  Return the head of entry_queue E
  60
  61    procedure Dequeue_Head
  62      (E    : in out Entry_Queue;
  63       Call : out Entry_Call_Link);
  64    --  Remove and return the head of entry_queue E
  65
  66    function Onqueue (Call : Entry_Call_Link) return Boolean;
  67    pragma Inline (Onqueue);
  68    --  Return True if Call is on any entry_queue at all
  69
  70    function Count_Waiting (E : Entry_Queue) return Natural;
  71    --  Return number of calls on the waiting queue of E
  72
  73    procedure Select_Task_Entry_Call
  74      (Acceptor         : Task_Id;
  75       Open_Accepts     : Accept_List_Access;
  76       Call             : out Entry_Call_Link;
  77       Selection        : out Select_Index;
  78       Open_Alternative : out Boolean);
  79    --  Select an entry for rendezvous.  On exit:
  80    --    Call will contain a pointer to the entry call record selected;
  81    --    Selection will contain the index of the alternative selected
  82    --    Open_Alternative will be True if there were any open alternatives
  83
  84    procedure Select_Protected_Entry_Call
  85      (Self_ID : Task_Id;
  86       Object  : POE.Protection_Entries_Access;
  87       Call    : out Entry_Call_Link);
  88    --  Select an entry of a protected object
  89
  90    procedure Enqueue_Call (Entry_Call : Entry_Call_Link);
  91    procedure Dequeue_Call (Entry_Call : Entry_Call_Link);
  92    --  Enqueue (dequeue) the call to (from) whatever server they are
  93    --  calling, whether a task or a protected object.
  94
  95    procedure Requeue_Call_With_New_Prio
  96      (Entry_Call : Entry_Call_Link; Prio : System.Any_Priority);
  97    --  Change Priority of the call and re insert to the queue when priority
  98    --  queueing is in effect. When FIFO is inforced, this routine
  99    --  should not have any effect.
 100
 101 end System.Tasking.Queuing;