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1 ------------------------------------------------------------------------------
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2 -- --
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3 -- GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS --
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4 -- --
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5 -- S Y S T E M . T A S K I N G . Q U E U I N G --
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6 -- --
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7 -- S p e c --
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8 -- --
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9 -- Copyright (C) 1992-2017, Free Software Foundation, Inc. --
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10 -- --
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11 -- GNARL is free software; you can redistribute it and/or modify it under --
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12 -- terms of the GNU General Public License as published by the Free Soft- --
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13 -- ware Foundation; either version 3, or (at your option) any later ver- --
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14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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16 -- or FITNESS FOR A PARTICULAR PURPOSE. --
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17 -- --
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18 -- As a special exception under Section 7 of GPL version 3, you are granted --
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19 -- additional permissions described in the GCC Runtime Library Exception, --
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20 -- version 3.1, as published by the Free Software Foundation. --
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21 -- --
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22 -- You should have received a copy of the GNU General Public License and --
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23 -- a copy of the GCC Runtime Library Exception along with this program; --
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24 -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
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25 -- <http://www.gnu.org/licenses/>. --
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26 -- --
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27 -- GNARL was developed by the GNARL team at Florida State University. --
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28 -- Extensive contributions were provided by Ada Core Technologies, Inc. --
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29 -- --
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30 ------------------------------------------------------------------------------
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31
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32 with System.Tasking.Protected_Objects.Entries;
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33
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34 package System.Tasking.Queuing is
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35
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36 package POE renames System.Tasking.Protected_Objects.Entries;
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37
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38 procedure Broadcast_Program_Error
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39 (Self_ID : Task_Id;
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40 Object : POE.Protection_Entries_Access;
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41 Pending_Call : Entry_Call_Link;
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42 RTS_Locked : Boolean := False);
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43 -- Raise Program_Error in all tasks calling the protected entries of Object
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44 -- The exception will not be raised immediately for the calling task; it
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45 -- will be deferred until it calls Check_Exception.
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46 -- RTS_Locked indicates whether the global RTS lock is taken (only
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47 -- relevant if Single_Lock is True).
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48
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49 procedure Enqueue (E : in out Entry_Queue; Call : Entry_Call_Link);
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50 -- Enqueue Call at the end of entry_queue E
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51
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52 procedure Dequeue (E : in out Entry_Queue; Call : Entry_Call_Link);
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53 -- Dequeue Call from entry_queue E
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54
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55 function Head (E : Entry_Queue) return Entry_Call_Link;
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56 pragma Inline (Head);
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57 -- Return the head of entry_queue E
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58
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59 procedure Dequeue_Head
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60 (E : in out Entry_Queue;
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61 Call : out Entry_Call_Link);
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62 -- Remove and return the head of entry_queue E
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63
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64 function Onqueue (Call : Entry_Call_Link) return Boolean;
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65 pragma Inline (Onqueue);
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66 -- Return True if Call is on any entry_queue at all
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67
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68 function Count_Waiting (E : Entry_Queue) return Natural;
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69 -- Return number of calls on the waiting queue of E
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70
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71 procedure Select_Task_Entry_Call
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72 (Acceptor : Task_Id;
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73 Open_Accepts : Accept_List_Access;
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74 Call : out Entry_Call_Link;
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75 Selection : out Select_Index;
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76 Open_Alternative : out Boolean);
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77 -- Select an entry for rendezvous. On exit:
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78 -- Call will contain a pointer to the entry call record selected;
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79 -- Selection will contain the index of the alternative selected
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80 -- Open_Alternative will be True if there were any open alternatives
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81
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82 procedure Select_Protected_Entry_Call
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83 (Self_ID : Task_Id;
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84 Object : POE.Protection_Entries_Access;
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85 Call : out Entry_Call_Link);
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86 -- Select an entry of a protected object
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87
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88 procedure Enqueue_Call (Entry_Call : Entry_Call_Link);
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89 procedure Dequeue_Call (Entry_Call : Entry_Call_Link);
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90 -- Enqueue (dequeue) the call to (from) whatever server they are
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91 -- calling, whether a task or a protected object.
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92
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93 procedure Requeue_Call_With_New_Prio
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94 (Entry_Call : Entry_Call_Link; Prio : System.Any_Priority);
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95 -- Change Priority of the call and re insert to the queue when priority
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96 -- queueing is in effect. When FIFO is enforced, this routine
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97 -- should not have any effect.
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98
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99 end System.Tasking.Queuing;
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