+++ /dev/null
-------------------------------------------------------------------------------
--- --
--- 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: 1.1.16.1 $
--- --
--- Copyright (C) 1992-2000, 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. --
--- Extensive contributions were provided by Ada Core Technologies Inc. --
--- --
-------------------------------------------------------------------------------
-
--- This is a Solaris version of this package.
--- It was created by hand for use with new "checked"
--- GNULLI primitives.
-
--- 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 mutex_t
--- cond_t
--- thread_t
-
-package System.Task_Primitives is
- pragma Preelaborate;
-
- type Lock is limited private;
- type Lock_Ptr is access all Lock;
- -- Should be used for implementation of protected objects.
-
- type RTS_Lock is limited private;
- type RTS_Lock_Ptr is access all RTS_Lock;
- -- 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 Private_Task_Serial_Number is mod 2 ** 64;
- -- Used to give each task a unique serial number.
-
- type Base_Lock is new System.OS_Interface.mutex_t;
-
- type Owner_Int is new Integer;
- for Owner_Int'Alignment use Standard'Maximum_Alignment;
-
- type Owner_ID is access all Owner_Int;
-
- type Lock is record
- L : aliased Base_Lock;
- Ceiling : System.Any_Priority := System.Any_Priority'First;
- Saved_Priority : System.Any_Priority := System.Any_Priority'First;
- Owner : Owner_ID;
- Next : Lock_Ptr;
- Level : Private_Task_Serial_Number := 0;
- Buddy : Owner_ID;
- Frozen : Boolean := False;
- end record;
-
- type RTS_Lock is new Lock;
-
- -- Note that task support on gdb relies on the fact that the first
- -- 2 fields of Private_Data are Thread and LWP.
-
- type Private_Data is record
- Thread : aliased System.OS_Interface.thread_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.
-
- LWP : System.OS_Interface.lwpid_t;
- -- The LWP id of the thread. Set by self in Enter_Task.
-
- CV : aliased System.OS_Interface.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.
-
- Locking : Lock_Ptr;
- Locks : Lock_Ptr;
- Wakeups : Natural := 0;
- end record;
-
-end System.Task_Primitives;
projects / msp430-gcc.git / blobdiff