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-------------------------------------------------------------------------------
--- --
--- GNAT 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 --
--- --
--- Copyright (C) 1991-2009, 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 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. --
--- --
--- 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. --
--- --
-------------------------------------------------------------------------------
-
--- This is a NT (native) version of this package
-
-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;
-with System.Win32;
-
-package System.Task_Primitives is
- pragma Preelaborate;
-
- 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 Suspension_Object is limited private;
- -- Should be used for the implementation of Ada.Synchronous_Task_Control
-
- 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.
-
- subtype Task_Address is System.Address;
- -- In some versions of Task_Primitives, notably for VMS, Task_Address is
- -- the short version of address defined in System.Aux_DEC. To avoid
- -- dragging Aux_DEC into tasking packages a tasking specific subtype is
- -- defined here.
-
- Task_Address_Size : constant := Standard'Address_Size;
- -- The size of Task_Address
-
- Alternate_Stack_Size : constant := 0;
- -- No alternate signal stack is used on this platform
-
-private
-
- type Lock is record
- Mutex : aliased System.OS_Interface.CRITICAL_SECTION;
- Priority : Integer;
- Owner_Priority : Integer;
- end record;
-
- type Condition_Variable is new System.Win32.HANDLE;
-
- type RTS_Lock is new System.OS_Interface.CRITICAL_SECTION;
-
- type Suspension_Object is record
- State : Boolean;
- pragma Atomic (State);
- -- Boolean that indicates whether the object is open. This field is
- -- marked Atomic to ensure that we can read its value without locking
- -- the access to the Suspension_Object.
-
- Waiting : Boolean;
- -- Flag showing if there is a task already suspended on this object
-
- L : aliased System.OS_Interface.CRITICAL_SECTION;
- -- Protection for ensuring mutual exclusion on the Suspension_Object
-
- CV : aliased Win32.HANDLE;
- -- Condition variable used to queue threads until condition is signaled
- end record;
-
- type Private_Data is record
- Thread : aliased Win32.HANDLE;
- 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.
-
- Thread_Id : aliased Win32.DWORD;
- -- Used to provide a better tasking support in gdb
-
- CV : aliased Condition_Variable;
- -- Condition Variable used to implement Sleep/Wakeup
-
- L : aliased RTS_Lock;
- -- Protection for all components is lock L
- end record;
-
-end System.Task_Primitives;