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1 706 jeremybenn
------------------------------------------------------------------------------
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--                                                                          --
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--                 GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS                 --
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--                                                                          --
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--               S Y S T E M . T A S K _ P R I M I T I V E S                --
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--                                                                          --
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--                                 S p e c                                  --
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--                                                                          --
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--            Copyright (C) 1991-1994, Florida State University             --
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--                     Copyright (C) 1995-2011, AdaCore                     --
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--                                                                          --
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-- GNAT is free software;  you can  redistribute it  and/or modify it under --
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-- terms of the  GNU General Public License as published  by the Free Soft- --
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-- ware  Foundation;  either version 3,  or (at your option) any later ver- --
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-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
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-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
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-- or FITNESS FOR A PARTICULAR PURPOSE.                                     --
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--                                                                          --
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-- As a special exception under Section 7 of GPL version 3, you are granted --
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-- additional permissions described in the GCC Runtime Library Exception,   --
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-- version 3.1, as published by the Free Software Foundation.               --
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--                                                                          --
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-- You should have received a copy of the GNU General Public License and    --
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-- a copy of the GCC Runtime Library Exception along with this program;     --
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-- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
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-- <http://www.gnu.org/licenses/>.                                          --
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--                                                                          --
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-- GNARL was developed by the GNARL team at Florida State University.       --
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-- Extensive contributions were provided by Ada Core Technologies, Inc.     --
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--                                                                          --
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------------------------------------------------------------------------------
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--  This is a POSIX-like version of this package
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--  Note: this file can only be used for POSIX compliant systems
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pragma Polling (Off);
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--  Turn off polling, we do not want ATC polling to take place during tasking
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--  operations. It causes infinite loops and other problems.
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with System.OS_Interface;
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package System.Task_Primitives is
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   pragma Preelaborate;
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   type Lock is limited private;
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   --  Should be used for implementation of protected objects
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   type RTS_Lock is limited private;
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   --  Should be used inside the runtime system. The difference between Lock
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   --  and the RTS_Lock is that the later one serves only as a semaphore so
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   --  that do not check for ceiling violations.
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   type Suspension_Object is limited private;
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   --  Should be used for the implementation of Ada.Synchronous_Task_Control
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   type Task_Body_Access is access procedure;
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   --  Pointer to the task body's entry point (or possibly a wrapper declared
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   --  local to the GNARL).
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   type Private_Data is limited private;
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   --  Any information that the GNULLI needs maintained on a per-task basis.
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   --  A component of this type is guaranteed to be included in the
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   --  Ada_Task_Control_Block.
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   subtype Task_Address is System.Address;
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   --  In some versions of Task_Primitives, notably for VMS, Task_Address is
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   --  the short version of address defined in System.Aux_DEC. To avoid
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   --  dragging Aux_DEC into tasking packages a tasking specific subtype is
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   --  defined here.
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   Task_Address_Size : constant := Standard'Address_Size;
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   --  The size of Task_Address
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   Alternate_Stack_Size : constant := System.OS_Interface.Alternate_Stack_Size;
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   --  Import value from System.OS_Interface
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private
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   type Lock is record
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      RW : aliased System.OS_Interface.pthread_rwlock_t;
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      WO : aliased System.OS_Interface.pthread_mutex_t;
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   end record;
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   type RTS_Lock is new System.OS_Interface.pthread_mutex_t;
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   type Suspension_Object is record
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      State : Boolean;
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      pragma Atomic (State);
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      --  Boolean that indicates whether the object is open. This field is
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      --  marked Atomic to ensure that we can read its value without locking
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      --  the access to the Suspension_Object.
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      Waiting : Boolean;
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      --  Flag showing if there is a task already suspended on this object
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      L : aliased System.OS_Interface.pthread_mutex_t;
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      --  Protection for ensuring mutual exclusion on the Suspension_Object
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      CV : aliased System.OS_Interface.pthread_cond_t;
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      --  Condition variable used to queue threads until condition is signaled
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   end record;
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   type Private_Data is record
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      Thread : aliased System.OS_Interface.pthread_t;
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      pragma Atomic (Thread);
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      --  Thread field may be updated by two different threads of control.
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      --  (See, Enter_Task and Create_Task in s-taprop.adb). They put the same
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      --  value (thr_self value). We do not want to use lock on those
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      --  operations and the only thing we have to make sure is that they are
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      --  updated in atomic fashion.
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      LWP : aliased System.Address;
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      --  The purpose of this field is to provide a better tasking support on
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      --  gdb. The order of the two first fields (Thread and LWP) is important.
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      --  On targets where lwp is not relevant, this is equivalent to Thread.
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      CV : aliased System.OS_Interface.pthread_cond_t;
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      --  Should be commented ??? (in all versions of taspri)
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      L : aliased RTS_Lock;
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      --  Protection for all components is lock L
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   end record;
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end System.Task_Primitives;

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