96 lines
4.8 KiB
Ada
96 lines
4.8 KiB
Ada
------------------------------------------------------------------------------
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-- --
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-- GNAT RUNTIME COMPONENTS --
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-- --
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-- G N A T . T H R E A D S --
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-- --
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-- S p e c --
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-- --
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-- $Revision: 1.5 $
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-- --
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-- Copyright (C) 1998-2000 Ada Core Technologies, Inc. --
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-- --
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-- GNAT is free software; you can redistribute it and/or modify it under --
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-- terms of the GNU General Public License as published by the Free Soft- --
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-- ware Foundation; either version 2, or (at your option) any later ver- --
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-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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-- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
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-- for more details. You should have received a copy of the GNU General --
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-- Public License distributed with GNAT; see file COPYING. If not, write --
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-- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
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-- MA 02111-1307, USA. --
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-- --
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-- As a special exception, if other files instantiate generics from this --
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-- unit, or you link this unit with other files to produce an executable, --
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-- this unit does not by itself cause the resulting executable to be --
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-- covered by the GNU General Public License. This exception does not --
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-- however invalidate any other reasons why the executable file might be --
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-- covered by the GNU Public License. --
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-- --
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-- GNAT is maintained by Ada Core Technologies Inc (http://www.gnat.com). --
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-- --
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------------------------------------------------------------------------------
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-- This package provides facilities for creation of foreign threads for
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-- use as Ada tasks. In order to execute general Ada code, the run-time
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-- system must know about all tasks. This package allows foreign code,
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-- e.g. a C program, to create a thread that the Ada run-time knows about.
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with System;
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package GNAT.Threads is
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type Void_Ptr is access all Integer;
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function Create_Thread
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(Code : System.Address; -- pointer
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Parm : Void_Ptr; -- pointer
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Size : Natural; -- int
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Prio : Integer) -- int
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return System.Address;
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pragma Export (C, Create_Thread, "__gnat_create_thread");
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-- Creates a thread with the given (Size) stack size in bytes, and
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-- the given (Prio) priority. The task will execute a call to the
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-- procedure whose address is given by Code. This procedure has
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-- the prototype
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--
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-- void thread_code (void *id, void *parm);
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--
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-- where id is the id of the created task, and parm is the parameter
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-- passed to Create_Thread. The called procedure is the body of the
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-- code for the task, the task will be automatically terminated when
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-- the procedure returns.
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--
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-- This function returns the Ada Id of the created task that can then be
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-- used as a parameter to the procedures below.
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--
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-- C declaration:
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--
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-- extern void *__gnat_create_thread
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-- (void (*code)(void *, void *), void *parm, int size, int prio);
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procedure Destroy_Thread (Id : System.Address);
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pragma Export (C, Destroy_Thread, "__gnat_destroy_thread");
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-- This procedure may be used to prematurely abort the created thread.
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-- The value Id is the value that was passed to the thread code procedure
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-- at activation time.
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--
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-- C declaration:
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--
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-- extern void __gnat_destroy_thread (void *id);
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procedure Get_Thread (Id : System.Address; Thread : System.Address);
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pragma Export (C, Get_Thread, "__gnat_get_thread");
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-- This procedure is used to retrieve the thread id of a given task.
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-- The value Id is the value that was passed to the thread code procedure
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-- at activation time.
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-- Thread is a pointer to a thread id that will be updated by this
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-- procedure.
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--
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-- C declaration:
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--
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-- extern void __gnat_get_thread (void *id, pthread_t *thread);
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end GNAT.Threads;
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