+++ /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 $
--- --
--- Copyright (C) 1991-2000, Florida State University --
--- --
--- 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. It is --
--- now maintained by Ada Core Technologies Inc. in cooperation with Florida --
--- State University (http://www.gnat.com). --
--- --
-------------------------------------------------------------------------------
-
--- This is a POSIX-like version of this package.
--- Note: this file can only be used for POSIX compliant systems.
-
-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 pthread_mutex_t
--- pthread_cond_t
--- pthread_t
-
-package System.Task_Primitives is
-
- 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 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 Lock is new System.OS_Interface.pthread_mutex_t;
- type RTS_Lock is new System.OS_Interface.pthread_mutex_t;
-
- type Private_Data is record
- Thread : aliased System.OS_Interface.pthread_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 : aliased System.Address;
- -- The purpose of this field is to provide a better tasking support on
- -- gdb. The order of the two first fields (Thread and LWP) is important.
- -- On targets where lwp is not relevant, this is equivalent to Thread.
-
- CV : aliased System.OS_Interface.pthread_cond_t;
-
- L : aliased RTS_Lock;
- -- Protection for all components is lock L
- end record;
-
-end System.Task_Primitives;
projects / msp430-gcc.git / blobdiff