gcc/ada/s-taenca.ads

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                GNU ADA RUN-TIME LIBRARY (GNARL) COMPONENTS               --
   4 --                                                                          --
   5 --             S Y S T E M . T A S K I N G . E N T R Y _ C A L L S          --
   6 --                                                                          --
   7 --                                  S p e c                                 --
   8 --                                                                          --
   9 --                             $Revision: 1.12 $                            --
  10 --                                                                          --
  11 --            Copyright (C) 1991-1998, Florida State University             --
  12 --                                                                          --
  13 -- GNARL is free software; you can  redistribute it  and/or modify it under --
  14 -- terms of the  GNU General Public License as published  by the Free Soft- --
  15 -- ware  Foundation;  either version 2,  or (at your option) any later ver- --
  16 -- sion. GNARL is distributed in the hope that it will be useful, but WITH- --
  17 -- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
  18 -- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
  19 -- for  more details.  You should have  received  a copy of the GNU General --
  20 -- Public License  distributed with GNARL; see file COPYING.  If not, write --
  21 -- to  the Free Software Foundation,  59 Temple Place - Suite 330,  Boston, --
  22 -- MA 02111-1307, USA.                                                      --
  23 --                                                                          --
  24 -- As a special exception,  if other files  instantiate  generics from this --
  25 -- unit, or you link  this unit with other files  to produce an executable, --
  26 -- this  unit  does not  by itself cause  the resulting  executable  to  be --
  27 -- covered  by the  GNU  General  Public  License.  This exception does not --
  28 -- however invalidate  any other reasons why  the executable file  might be --
  29 -- covered by the  GNU Public License.                                      --
  30 --                                                                          --
  31 -- GNARL was developed by the GNARL team at Florida State University. It is --
  32 -- now maintained by Ada Core Technologies Inc. in cooperation with Florida --
  33 -- State University (http://www.gnat.com).                                  --
  34 --                                                                          --
  35 ------------------------------------------------------------------------------
  36
  37 package System.Tasking.Entry_Calls is
  38
  39    procedure Wait_For_Completion
  40      (Self_ID : Task_ID;
  41       Entry_Call : Entry_Call_Link);
  42    --  This procedure suspends the calling task until the specified entry
  43    --  call has either been completed or cancelled. It performs other
  44    --  operations required of suspended tasks, such as performing
  45    --  dynamic priority changes. On exit, the call will not be queued.
  46    --  This waits for calls on task or protected entries.
  47    --  Abortion must be deferred when calling this procedure.
  48    --  Call this only when holding Self_ID locked.
  49
  50    procedure Wait_For_Completion_With_Timeout
  51      (Self_ID     : Task_ID;
  52       Entry_Call  : Entry_Call_Link;
  53       Wakeup_Time : Duration;
  54       Mode        : Delay_Modes);
  55    --  Same as Wait_For_Completion but it wait for a timeout with the value
  56    --  specified in Wakeup_Time as well.
  57    --  Self_ID will be locked by this procedure.
  58
  59    procedure Wait_Until_Abortable
  60      (Self_ID : Task_ID;
  61       Call : Entry_Call_Link);
  62    --  This procedure suspends the calling task until the specified entry
  63    --  call is queued abortably or completes.
  64    --  Abortion must be deferred when calling this procedure.
  65
  66    procedure Try_To_Cancel_Entry_Call (Succeeded : out Boolean);
  67    pragma Inline (Try_To_Cancel_Entry_Call);
  68    --  Try to cancel async. entry call.
  69    --  Effect includes Abort_To_Level and Wait_For_Completion.
  70    --  Cancelled = True iff the cancelation was successful, i.e.,
  71    --  the call was not Done before this call.
  72    --  On return, the call is off-queue and the ATC level is reduced by one.
  73
  74    procedure Reset_Priority
  75      (Acceptor_Prev_Priority : Rendezvous_Priority;
  76       Acceptor               : Task_ID);
  77    pragma Inline (Reset_Priority);
  78    --  Reset the priority of a task completing an accept statement to
  79    --  the value it had before the call.
  80
  81    procedure Check_Exception
  82      (Self_ID : Task_ID;
  83       Entry_Call : Entry_Call_Link);
  84    pragma Inline (Check_Exception);
  85    --  Raise any pending exception from the Entry_Call.
  86    --  This should be called at the end of every compiler interface
  87    --  procedure that implements an entry call.
  88    --  In principle, the caller should not be abort-deferred (unless
  89    --  the application program violates the Ada language rules by doing
  90    --  entry calls from within protected operations -- an erroneous practice
  91    --  apparently followed with success by some adventurous GNAT users).
  92    --  Absolutely, the caller should not be holding any locks, or there
  93    --  will be deadlock.
  94
  95 end System.Tasking.Entry_Calls;