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------------------------------------------------------------------------------
-- --
-- GNU ADA RUNTIME 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 --
-- (Version for new GNARL) --
-- --
-- $Revision: 1.1 $ --
-- --
-- Copyright (C) 1991,92,93,94,95,1996 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. It is --
-- now maintained by Ada Core Technologies Inc. in cooperation with Florida --
-- State University (http://www.gnat.com). --
-- --
------------------------------------------------------------------------------
-- This is the FreeBSD PTHREADS version of this package. Contributed
-- by Daniel M. Eischen (deischen@iworks.InterWorks.org).
-- DO NOT EDIT this file.
-- It was automatically generated from another file by the m4 macro processor.
-- The name of the file you should edit is the same as this one, but with
-- ".ads" replaced by ".sm4", or
-- ".adb" replaced by ".bm4", or
-- ".c" replaced by ".cm4", or
-- ".dat" replaced by ".tm4"
-- Local options selected:
-- __TARGET = i386-unknown-freebsd
-- __ARCH = I386
-- __OS = FREEBSD
-- __HAS_SIGCONTEXT = 1
-- __HAS_UCONTEXT = 0
-- __THREADS = POSIX_THREADS
-- __THREAD_VARIANT = ??
-- __HAS_TIMESPEC = 1
-- __HAS_NANOSLEEP = 1
-- __HAS_CLOCK_GETTIME = 0
-- __HAS_GETTIMEOFDAY = 1
-- __POSIX_THREAD_PRIO_PROTECT = 0
-- __POSIX_THREAD_PRIO_INHERIT = 0
-- __POSIX_THREAD_ATTR_STACKADDR = 1
-- __POSIX_THREAD_ATTR_STACKSIZE = 1
-- __POSIX_THREAD_PRIORITY_SCHEDULING = 0
-- This package provides low-level support for most tasking features.
with Interfaces.C;
-- used for int
-- size_t
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.
CV : aliased System.OS_Interface.pthread_cond_t;
L : aliased RTS_Lock;
-- protection for all components is lock L
Current_Priority : Interfaces.C.int := 0;
-- Active priority, except that the effects of protected object
-- priority ceilings are not reflected. This only reflects explicit
-- priority changes and priority inherited through task activation
-- and rendezvous.
-- Ada 95 notes: In Ada 95, this field will be transferred to the
-- Priority field of an Entry_Calls component when an entry call
-- is initiated. The Priority of the Entry_Calls component will not
-- change for the duration of the call. The accepting task can
-- use it to boost its own priority without fear of its changing in
-- the meantime.
-- This can safely be used in the priority ordering
-- of entry queues. Once a call is queued, its priority does not
-- change.
-- Since an entry call cannot be made while executing
-- a protected action, the priority of a task will never reflect a
-- priority ceiling change at the point of an entry call.
-- Protection: Only written by Self, and only accessed when Acceptor
-- accepts an entry or when Created activates, at which points Self is
-- suspended.
Stack_Size : Interfaces.c.size_t;
-- Requested stack size.
-- Protection: Only used by Self.
end record;
end System.Task_Primitives;
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