New Language: Ada

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@45952 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 99 insertions, 0 deletions

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+------------------------------------------------------------------------------
+--                                                                          --
+--                GNU ADA RUN-TIME LIBRARY (GNARL) COMPONENTS               --
+--                                                                          --
+--                 S Y S T E M . T A S K _ P R I M I T I V E S              --
+--                                                                          --
+--                                  S p e c                                 --
+--                                                                          --
+--                             $Revision: 1.5 $
+--                                                                          --
+--           Copyright (C) 1991-2000 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- --
+-- 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,  59 Temple Place - Suite 330,  Boston, --
+-- MA 02111-1307, USA.                                                      --
+--                                                                          --
+-- 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.                                      --
+--                                                                          --
+-- GNARL was developed by the GNARL team at Florida State University. It is --
+-- now maintained by Ada Core Technologies Inc. in cooperation with Florida --
+-- State University (http://www.gnat.com).                                  --
+--                                                                          --
+------------------------------------------------------------------------------
+
+--  This is the Linux (LinuxThreads) version of this package.
+
+--  This package provides low-level support for most tasking features.
+
+pragma Polling (Off);
+--  Turn off polling, we do not want ATC polling to take place during
+--  tasking operations. It causes infinite loops and other problems.
+
+with System.OS_Interface;
+--  used for pthread_mutex_t
+--           pthread_cond_t
+--           pthread_t
+
+package System.Task_Primitives is
+
+   type Lock is limited private;
+   --  Should be used for implementation of protected objects.
+
+   type RTS_Lock is limited private;
+   --  Should be used inside the runtime system.
+   --  The difference between Lock and the RTS_Lock is that the later
+   --  one serves only as a semaphore so that do not check for
+   --  ceiling violations.
+
+   type Task_Body_Access is access procedure;
+   --  Pointer to the task body's entry point (or possibly a wrapper
+   --  declared local to the GNARL).
+
+   type Private_Data is limited private;
+   --  Any information that the GNULLI needs maintained on a per-task
+   --  basis.  A component of this type is guaranteed to be included
+   --  in the Ada_Task_Control_Block.
+
+private
+
+   type Prio_Array_Type is array (System.Any_Priority) of Integer;
+
+   type Lock is record
+      L          : aliased System.OS_Interface.pthread_mutex_t;
+      Ceiling    : System.Any_Priority := System.Any_Priority'First;
+      Saved_Priority : System.Any_Priority := System.Any_Priority'First;
+   end record;
+
+   type RTS_Lock is new System.OS_Interface.pthread_mutex_t;
+   type Private_Data is record
+      Thread      : aliased System.OS_Interface.pthread_t;
+      pragma Atomic (Thread);
+      --  Thread field may be updated by two different threads of control.
+      --  (See, Enter_Task and Create_Task in s-taprop.adb).
+      --  They put the same value (thr_self value). We do not want to
+      --  use lock on those operations and the only thing we have to
+      --  make sure is that they are updated in atomic fashion.
+
+      CV          : aliased System.OS_Interface.pthread_cond_t;
+      L           : aliased RTS_Lock;
+      --  protection for all components is lock L
+
+      Active_Priority : System.Any_Priority := System.Any_Priority'First;
+      --  Simulated active priority,
+      --  used only if Priority_Ceiling_Support is True.
+   end record;
+
+end System.Task_Primitives;