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8406115834
Access to the gpxe.org and etherboot.org domains and associated resources has been revoked by the registrant of the domain. Work around this problem by renaming project from gPXE to iPXE, and updating URLs to match. Also update README, LOG and COPYRIGHTS to remove obsolete information. Signed-off-by: Michael Brown <mcb30@ipxe.org>
107 lines
2.8 KiB
C
107 lines
2.8 KiB
C
/*
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* Copyright (C) 2006 Michael Brown <mbrown@fensystems.co.uk>.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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FILE_LICENCE ( GPL2_OR_LATER );
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#include <ipxe/list.h>
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#include <ipxe/init.h>
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#include <ipxe/process.h>
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/** @file
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*
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* Processes
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*
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* We implement a trivial form of cooperative multitasking, in which
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* all processes share a single stack and address space.
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*/
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/** Process run queue */
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static LIST_HEAD ( run_queue );
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/**
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* Add process to process list
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*
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* @v process Process
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*
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* It is safe to call process_add() multiple times; further calls will
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* have no effect.
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*/
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void process_add ( struct process *process ) {
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if ( list_empty ( &process->list ) ) {
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DBGC ( process, "PROCESS %p starting\n", process );
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ref_get ( process->refcnt );
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list_add_tail ( &process->list, &run_queue );
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} else {
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DBGC ( process, "PROCESS %p already started\n", process );
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}
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}
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/**
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* Remove process from process list
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*
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* @v process Process
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*
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* It is safe to call process_del() multiple times; further calls will
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* have no effect.
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*/
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void process_del ( struct process *process ) {
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if ( ! list_empty ( &process->list ) ) {
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DBGC ( process, "PROCESS %p stopping\n", process );
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list_del ( &process->list );
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INIT_LIST_HEAD ( &process->list );
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ref_put ( process->refcnt );
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} else {
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DBGC ( process, "PROCESS %p already stopped\n", process );
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}
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}
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/**
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* Single-step a single process
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*
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* This executes a single step of the first process in the run queue,
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* and moves the process to the end of the run queue.
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*/
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void step ( void ) {
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struct process *process;
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list_for_each_entry ( process, &run_queue, list ) {
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list_del ( &process->list );
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list_add_tail ( &process->list, &run_queue );
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DBGC2 ( process, "PROCESS %p executing\n", process );
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process->step ( process );
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DBGC2 ( process, "PROCESS %p finished executing\n", process );
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break;
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}
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}
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/**
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* Initialise processes
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*
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*/
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static void init_processes ( void ) {
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struct process *process;
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for_each_table_entry ( process, PERMANENT_PROCESSES )
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process_add ( process );
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}
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/** Process initialiser */
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struct init_fn process_init_fn __init_fn ( INIT_NORMAL ) = {
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.initialise = init_processes,
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};
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