------------------------------------------------------------------------------ -- -- -- 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 -- -- -- -- Copyright (C) 1992-2004, 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 -- 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 with Unchecked_Conversion; 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. function To_Lock_Ptr is new Unchecked_Conversion (RTS_Lock_Ptr, Lock_Ptr); 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; function To_Owner_ID is new Unchecked_Conversion (System.Address, Owner_ID); 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;