115 lines
5.5 KiB
Ada
115 lines
5.5 KiB
Ada
------------------------------------------------------------------------------
|
|
-- --
|
|
-- GNAT 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) 1991-2017, Florida State University --
|
|
-- Copyright (C) 1995-2020, AdaCore --
|
|
-- --
|
|
-- GNAT 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 3, or (at your option) any later ver- --
|
|
-- sion. GNAT 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. --
|
|
-- --
|
|
-- As a special exception under Section 7 of GPL version 3, you are granted --
|
|
-- additional permissions described in the GCC Runtime Library Exception, --
|
|
-- version 3.1, as published by the Free Software Foundation. --
|
|
-- --
|
|
-- You should have received a copy of the GNU General Public License and --
|
|
-- a copy of the GCC Runtime Library Exception along with this program; --
|
|
-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
|
|
-- <http://www.gnu.org/licenses/>. --
|
|
-- --
|
|
-- GNARL was developed by the GNARL team at Florida State University. --
|
|
-- Extensive contributions were provided by Ada Core Technologies, Inc. --
|
|
-- --
|
|
------------------------------------------------------------------------------
|
|
|
|
-- This is LynxOS Family version of this package.
|
|
|
|
with System.OS_Interface;
|
|
|
|
package System.Task_Primitives is
|
|
pragma Preelaborate;
|
|
|
|
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 latter serves only as a semaphore so that
|
|
-- we do not check for ceiling violations.
|
|
|
|
type Suspension_Object is limited private;
|
|
-- Should be used for the implementation of Ada.Synchronous_Task_Control
|
|
|
|
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.
|
|
|
|
subtype Task_Address is System.Address;
|
|
Task_Address_Size : constant := Standard'Address_Size;
|
|
-- Type used for task addresses and its size
|
|
|
|
Alternate_Stack_Size : constant := System.OS_Interface.Alternate_Stack_Size;
|
|
-- Import value from System.OS_Interface
|
|
|
|
private
|
|
|
|
type Lock is record
|
|
RW : aliased System.OS_Interface.pthread_rwlock_t;
|
|
WO : aliased System.OS_Interface.pthread_mutex_t;
|
|
end record;
|
|
|
|
type RTS_Lock is new System.OS_Interface.pthread_mutex_t;
|
|
|
|
type Suspension_Object is record
|
|
State : Boolean;
|
|
pragma Atomic (State);
|
|
-- Boolean that indicates whether the object is open. This field is
|
|
-- marked Atomic to ensure that we can read its value without locking
|
|
-- the access to the Suspension_Object.
|
|
|
|
Waiting : Boolean;
|
|
-- Flag showing if there is a task already suspended on this object
|
|
|
|
L : aliased System.OS_Interface.pthread_mutex_t;
|
|
-- Protection for ensuring mutual exclusion on the Suspension_Object
|
|
|
|
CV : aliased System.OS_Interface.pthread_cond_t;
|
|
-- Condition variable used to queue threads until condition is signaled
|
|
end record;
|
|
|
|
type Private_Data is limited 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.OS_Interface.pthread_t;
|
|
-- 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;
|
|
-- Should be commented ??? (in all versions of taspri)
|
|
|
|
L : aliased RTS_Lock;
|
|
-- Protection for all components is lock L
|
|
end record;
|
|
|
|
end System.Task_Primitives;
|