-- --
-- B o d y --
-- --
--- Copyright (C) 1992-2007, Free Software Foundation, Inc. --
+-- Copyright (C) 1992-2010, Free Software Foundation, Inc. --
-- --
-- GNARL 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 2, or (at your option) any later ver- --
--- sion. GNARL is distributed in the hope that it will be useful, but WITH- --
+-- 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. See the GNU General Public License --
--- for more details. You should have received a copy of the GNU General --
--- Public License distributed with GNARL; see file COPYING. If not, write --
--- to the Free Software Foundation, 51 Franklin Street, Fifth Floor, --
--- Boston, MA 02110-1301, USA. --
+-- or FITNESS FOR A PARTICULAR PURPOSE. --
-- --
--- As a special exception, if other files instantiate generics from this --
--- unit, or you link this unit with other files to produce an executable, --
--- this unit does not by itself cause the resulting executable to be --
--- covered by the GNU General Public License. This exception does not --
--- however invalidate any other reasons why the executable file might be --
--- covered by the GNU Public License. --
+-- 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/>. --
-- --
-- GNARL was developed by the GNARL team at Florida State University. --
-- Extensive contributions were provided by Ada Core Technologies, Inc. --
------------------------------------------------------------------------------
with System.Task_Primitives.Operations;
--- used for Get_Priority
--- Set_Priority
--- Write_Lock
--- Unlock
--- Sleep
--- Wakeup
--- Timed_Sleep
-
with System.Tasking.Entry_Calls;
--- Used for Wait_For_Completion
--- Wait_For_Completion_With_Timeout
--- Wait_Until_Abortable
-
with System.Tasking.Initialization;
--- used for Defer_Abort
--- Undefer_Abort
--- Do_Pending_Action
-
with System.Tasking.Queuing;
--- used for Enqueue
--- Dequeue_Head
--- Select_Task_Entry_Call
--- Count_Waiting
-
with System.Tasking.Utilities;
--- used for Check_Exception
--- Make_Passive
--- Wakeup_Entry_Caller
--- Exit_One_ATC_Level
-
with System.Tasking.Protected_Objects.Operations;
--- used for PO_Do_Or_Queue
--- PO_Service_Entries
--- Lock_Entries
-
with System.Tasking.Debug;
--- used for Trace
-
with System.Restrictions;
--- used for Abort_Allowed
-
with System.Parameters;
--- used for Single_Lock
--- Runtime_Traces
-
with System.Traces.Tasking;
--- used for Send_Trace_Info
package body System.Tasking.Rendezvous is
if System.Tasking.Detect_Blocking
and then STPO.Self.Common.Protected_Action_Nesting > 0
then
- Ada.Exceptions.Raise_Exception
- (Program_Error'Identity, "potentially blocking operation");
+ raise Program_Error with "potentially blocking operation";
end if;
Call_Synchronous
-- If this is a call made inside of an abort deferred region,
-- the call should be never abortable.
- if Self_Id.Deferral_Level > 1 then
- Entry_Call.State := Never_Abortable;
- else
- Entry_Call.State := Now_Abortable;
- end if;
+ Entry_Call.State :=
+ (if Self_Id.Deferral_Level > 1
+ then Never_Abortable
+ else Now_Abortable);
Entry_Call.E := Entry_Index (E);
Entry_Call.Prio := Get_Priority (Self_Id);
end if;
Initialization.Undefer_Abort (Self_Id);
- Ada.Exceptions.Raise_Exception
- (Program_Error'Identity, "Entry call not a delay mode");
+ raise Program_Error with "Entry call not a delay mode";
end if;
end case;
-- we would not have gotten this far, so now we should
-- (re)enqueue the call, if the mode permits that.
- if Entry_Call.Mode /= Conditional_Call
- or else not Entry_Call.With_Abort
+ -- If the call is timed, it may have timed out before the requeue,
+ -- in the unusual case where the current accept has taken longer than
+ -- the given delay. In that case the requeue is cancelled, and the
+ -- outer timed call will be aborted.
+
+ if Entry_Call.Mode = Conditional_Call
+ or else
+ (Entry_Call.Mode = Timed_Call
+ and then Entry_Call.With_Abort
+ and then Entry_Call.Cancellation_Attempted)
then
+ STPO.Unlock (Acceptor);
+
+ if Parent_Locked then
+ STPO.Unlock (Parent);
+ end if;
+
+ STPO.Write_Lock (Entry_Call.Self);
+
+ pragma Assert (Entry_Call.State >= Was_Abortable);
+
+ Initialization.Wakeup_Entry_Caller (Self_ID, Entry_Call, Cancelled);
+ STPO.Unlock (Entry_Call.Self);
+
+ else
-- Timed_Call, Simple_Call, or Asynchronous_Call
Queuing.Enqueue (Acceptor.Entry_Queues (E), Entry_Call);
if Old_State /= Entry_Call.State
and then Entry_Call.State = Now_Abortable
- and then Entry_Call.Mode > Simple_Call
+ and then Entry_Call.Mode /= Simple_Call
and then Entry_Call.Self /= Self_ID
-- Asynchronous_Call or Conditional_Call
STPO.Unlock (Entry_Call.Self);
end if;
-
- else
- -- Conditional_Call and With_Abort
-
- STPO.Unlock (Acceptor);
-
- if Parent_Locked then
- STPO.Unlock (Parent);
- end if;
-
- STPO.Write_Lock (Entry_Call.Self);
-
- pragma Assert (Entry_Call.State >= Was_Abortable);
-
- Initialization.Wakeup_Entry_Caller (Self_ID, Entry_Call, Cancelled);
- STPO.Unlock (Entry_Call.Self);
end if;
return True;
if System.Tasking.Detect_Blocking
and then Self_Id.Common.Protected_Action_Nesting > 0
then
- Ada.Exceptions.Raise_Exception
- (Program_Error'Identity, "potentially blocking operation");
+ raise Program_Error with "potentially blocking operation";
end if;
if Parameters.Runtime_Traces then
-- Wait for a normal call and a pending action until the
-- Wakeup_Time is reached.
- Self_Id.Common.State := Acceptor_Sleep;
+ Self_Id.Common.State := Acceptor_Delay_Sleep;
-- Try to remove calls to Sleep in the loop below by letting the
-- caller a chance of getting ready immediately, using Unlock
exit when Self_Id.Open_Accepts = null;
if Timedout then
- Sleep (Self_Id, Acceptor_Sleep);
+ Sleep (Self_Id, Acceptor_Delay_Sleep);
else
if Parameters.Runtime_Traces then
Send_Trace_Info (WT_Select,
end if;
STPO.Timed_Sleep (Self_Id, Timeout, Mode,
- Acceptor_Sleep, Timedout, Yielded);
+ Acceptor_Delay_Sleep, Timedout, Yielded);
end if;
if Timedout then
-- 3) Spurious wakeup
Self_Id.Open_Accepts := null;
- Self_Id.Common.State := Acceptor_Sleep;
+ Self_Id.Common.State := Acceptor_Delay_Sleep;
- STPO.Timed_Sleep (Self_Id, Timeout, Mode, Acceptor_Sleep,
+ STPO.Timed_Sleep (Self_Id, Timeout, Mode, Acceptor_Delay_Sleep,
Timedout, Yielded);
Self_Id.Common.State := Runnable;
if System.Tasking.Detect_Blocking
and then Self_Id.Common.Protected_Action_Nesting > 0
then
- Ada.Exceptions.Raise_Exception
- (Program_Error'Identity, "potentially blocking operation");
+ raise Program_Error with "potentially blocking operation";
end if;
Initialization.Defer_Abort (Self_Id);
-- If this is a call made inside of an abort deferred region,
-- the call should be never abortable.
- if Self_Id.Deferral_Level > 1 then
- Entry_Call.State := Never_Abortable;
- else
- Entry_Call.State := Now_Abortable;
- end if;
+ Entry_Call.State :=
+ (if Self_Id.Deferral_Level > 1
+ then Never_Abortable
+ else Now_Abortable);
Entry_Call.E := Entry_Index (E);
Entry_Call.Prio := Get_Priority (Self_Id);
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