| ------------------------------------------------------------------------------ |
| -- -- |
| -- GNAT RUNTIME COMPONENTS -- |
| -- -- |
| -- G N A T . T H R E A D S -- |
| -- -- |
| -- S p e c -- |
| -- -- |
| -- $Revision: 1.5 $ |
| -- -- |
| -- Copyright (C) 1998-2000 Ada Core Technologies, Inc. -- |
| -- -- |
| -- 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 2, 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. See the GNU General Public License -- |
| -- for more details. You should have received a copy of the GNU General -- |
| -- Public License distributed with GNAT; 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. -- |
| -- -- |
| -- GNAT is maintained by Ada Core Technologies Inc (http://www.gnat.com). -- |
| -- -- |
| ------------------------------------------------------------------------------ |
| |
| -- This package provides facilities for creation of foreign threads for |
| -- use as Ada tasks. In order to execute general Ada code, the run-time |
| -- system must know about all tasks. This package allows foreign code, |
| -- e.g. a C program, to create a thread that the Ada run-time knows about. |
| |
| with System; |
| |
| package GNAT.Threads is |
| |
| type Void_Ptr is access all Integer; |
| |
| function Create_Thread |
| (Code : System.Address; -- pointer |
| Parm : Void_Ptr; -- pointer |
| Size : Natural; -- int |
| Prio : Integer) -- int |
| return System.Address; |
| pragma Export (C, Create_Thread, "__gnat_create_thread"); |
| -- Creates a thread with the given (Size) stack size in bytes, and |
| -- the given (Prio) priority. The task will execute a call to the |
| -- procedure whose address is given by Code. This procedure has |
| -- the prototype |
| -- |
| -- void thread_code (void *id, void *parm); |
| -- |
| -- where id is the id of the created task, and parm is the parameter |
| -- passed to Create_Thread. The called procedure is the body of the |
| -- code for the task, the task will be automatically terminated when |
| -- the procedure returns. |
| -- |
| -- This function returns the Ada Id of the created task that can then be |
| -- used as a parameter to the procedures below. |
| -- |
| -- C declaration: |
| -- |
| -- extern void *__gnat_create_thread |
| -- (void (*code)(void *, void *), void *parm, int size, int prio); |
| |
| procedure Destroy_Thread (Id : System.Address); |
| pragma Export (C, Destroy_Thread, "__gnat_destroy_thread"); |
| -- This procedure may be used to prematurely abort the created thread. |
| -- The value Id is the value that was passed to the thread code procedure |
| -- at activation time. |
| -- |
| -- C declaration: |
| -- |
| -- extern void __gnat_destroy_thread (void *id); |
| |
| procedure Get_Thread (Id : System.Address; Thread : System.Address); |
| pragma Export (C, Get_Thread, "__gnat_get_thread"); |
| -- This procedure is used to retrieve the thread id of a given task. |
| -- The value Id is the value that was passed to the thread code procedure |
| -- at activation time. |
| -- Thread is a pointer to a thread id that will be updated by this |
| -- procedure. |
| -- |
| -- C declaration: |
| -- |
| -- extern void __gnat_get_thread (void *id, pthread_t *thread); |
| |
| end GNAT.Threads; |
