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-------------------------------------------------------------------------------
---                                                                          --
---                         GNAT RUNTIME COMPONENTS                          --
---                                                                          --
---         A D A . S Y N C H R O N O U S _ T A S K _ C O N T R O L          --
---                                                                          --
---                                 B o d y                                  --
---                                                                          --
---                            $Revision: 1.1.16.1 $
---                                                                          --
---            Copyright (C) 1992-2001 Free Software Foundation, Inc.        --
---                                                                          --
--- GNAT 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.  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 GNAT;  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.                                      --
---                                                                          --
--- GNAT was originally developed  by the GNAT team at  New York University. --
--- Extensive contributions were provided by Ada Core Technologies Inc.      --
---                                                                          --
-------------------------------------------------------------------------------
-
-with Interfaces.C;
-package body Ada.Synchronous_Task_Control is
-   use System.OS_Interface;
-   use type Interfaces.C.int;
-
-   -------------------
-   -- Current_State --
-   -------------------
-
-   function Current_State (S : Suspension_Object) return Boolean is
-      St     : STATUS;
-      Result : Boolean := False;
-
-   begin
-      --  Determine state by attempting to take the semaphore with
-      --  a 0 timeout value.  Status = OK indicates the semaphore was
-      --  full, so reset it to the full state.
-
-      St := semTake (S.Sema, NO_WAIT);
-
-      if St = OK then
-         --  Took the semaphore. Reset semaphore state to FULL
-         Result := True;
-         St := semGive (S.Sema);
-      end if;
-
-      return Result;
-   end Current_State;
-
-   ---------------
-   -- Set_False --
-   ---------------
-
-   procedure Set_False (S : in out Suspension_Object) is
-      St : STATUS;
-   begin
-      --  Need to get the semaphore into the "empty" state.
-      --  On return, this task will have made the semaphore
-      --  empty (St = OK) or have left it empty.
-      St := semTake (S.Sema, NO_WAIT);
-   end Set_False;
-
-   --------------
-   -- Set_True --
-   --------------
-
-   procedure Set_True (S : in out Suspension_Object) is
-      St : STATUS;
-   begin
-      St := semGive (S.Sema);
-   end Set_True;
-
-   ------------------------
-   -- Suspend_Until_True --
-   ------------------------
-
-   procedure Suspend_Until_True (S : in out Suspension_Object) is
-      St : STATUS;
-
-      --  Declare local exception so the mutex can still be reset
-      --  to full if Program_Error is raised
-
-      Task_Already_Pending : exception;
-   begin
-      --  Determine whether another task is pending on the suspension
-      --  object. Should never be called from an ISR. Therefore semTake can
-      --  be called on the mutex
-      St := semTake (S.Mutex, NO_WAIT);
-
-      if St = OK then
-         --  Wait for suspension object
-
-         St := semTake (S.Sema, WAIT_FOREVER);
-         St := semGive (S.Mutex);
-
-      else
-         --  Another task is pending on the suspension object
-
-         raise Task_Already_Pending;
-      end if;
-   exception
-      when Task_Already_Pending =>
-         raise Program_Error;
-      when others =>
-         St := semGive (S.Mutex);
-         raise;
-   end Suspend_Until_True;
-
-   procedure Initialize (S : in out Suspension_Object) is
-   begin
-      S.Sema := semBCreate (SEM_Q_FIFO, SEM_EMPTY);
-
-      --  Use simpler binary semaphore instead of VxWorks
-      --  mutual exclusion semaphore, because we don't need
-      --  the fancier semantics and their overhead.
-
-      S.Mutex := semBCreate (SEM_Q_FIFO, SEM_FULL);
-   end Initialize;
-
-   procedure Finalize (S : in out Suspension_Object) is
-      St : STATUS;
-   begin
-      St := semDelete (S.Sema);
-      St := semDelete (S.Mutex);
-   end Finalize;
-
-end Ada.Synchronous_Task_Control;