--- /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 --
+-- --
+-- Copyright (C) 1991-1994, Florida State University --
+-- Copyright (C) 1995-2003, Ada Core Technologies --
+-- --
+-- 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 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;
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