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Diffstat (limited to 'qemu/roms/ipxe/src/core/process.c')
-rw-r--r-- | qemu/roms/ipxe/src/core/process.c | 137 |
1 files changed, 0 insertions, 137 deletions
diff --git a/qemu/roms/ipxe/src/core/process.c b/qemu/roms/ipxe/src/core/process.c deleted file mode 100644 index 69852c416..000000000 --- a/qemu/roms/ipxe/src/core/process.c +++ /dev/null @@ -1,137 +0,0 @@ -/* - * Copyright (C) 2006 Michael Brown <mbrown@fensystems.co.uk>. - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License as - * published by the Free Software Foundation; either version 2 of the - * License, or any later version. - * - * This program is distributed in the hope that it will be useful, but - * WITHOUT 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 - * along with this program; if not, write to the Free Software - * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA - * 02110-1301, USA. - * - * You can also choose to distribute this program under the terms of - * the Unmodified Binary Distribution Licence (as given in the file - * COPYING.UBDL), provided that you have satisfied its requirements. - */ - -FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL ); - -#include <ipxe/list.h> -#include <ipxe/init.h> -#include <ipxe/process.h> - -/** @file - * - * Processes - * - * We implement a trivial form of cooperative multitasking, in which - * all processes share a single stack and address space. - */ - -/** Process run queue */ -static LIST_HEAD ( run_queue ); - -/** - * Get pointer to object containing process - * - * @v process Process - * @ret object Containing object - */ -void * process_object ( struct process *process ) { - return ( ( ( void * ) process ) - process->desc->offset ); -} - -/** - * Add process to process list - * - * @v process Process - * - * It is safe to call process_add() multiple times; further calls will - * have no effect. - */ -void process_add ( struct process *process ) { - if ( ! process_running ( process ) ) { - DBGC ( PROC_COL ( process ), "PROCESS " PROC_FMT - " starting\n", PROC_DBG ( process ) ); - ref_get ( process->refcnt ); - list_add_tail ( &process->list, &run_queue ); - } else { - DBGC ( PROC_COL ( process ), "PROCESS " PROC_FMT - " already started\n", PROC_DBG ( process ) ); - } -} - -/** - * Remove process from process list - * - * @v process Process - * - * It is safe to call process_del() multiple times; further calls will - * have no effect. - */ -void process_del ( struct process *process ) { - if ( process_running ( process ) ) { - DBGC ( PROC_COL ( process ), "PROCESS " PROC_FMT - " stopping\n", PROC_DBG ( process ) ); - list_del ( &process->list ); - INIT_LIST_HEAD ( &process->list ); - ref_put ( process->refcnt ); - } else { - DBGC ( PROC_COL ( process ), "PROCESS " PROC_FMT - " already stopped\n", PROC_DBG ( process ) ); - } -} - -/** - * Single-step a single process - * - * This executes a single step of the first process in the run queue, - * and moves the process to the end of the run queue. - */ -void step ( void ) { - struct process *process; - struct process_descriptor *desc; - void *object; - - if ( ( process = list_first_entry ( &run_queue, struct process, - list ) ) ) { - ref_get ( process->refcnt ); /* Inhibit destruction mid-step */ - desc = process->desc; - object = process_object ( process ); - if ( desc->reschedule ) { - list_del ( &process->list ); - list_add_tail ( &process->list, &run_queue ); - } else { - process_del ( process ); - } - DBGC2 ( PROC_COL ( process ), "PROCESS " PROC_FMT - " executing\n", PROC_DBG ( process ) ); - desc->step ( object ); - DBGC2 ( PROC_COL ( process ), "PROCESS " PROC_FMT - " finished executing\n", PROC_DBG ( process ) ); - ref_put ( process->refcnt ); /* Allow destruction */ - } -} - -/** - * Initialise processes - * - */ -static void init_processes ( void ) { - struct process *process; - - for_each_table_entry ( process, PERMANENT_PROCESSES ) - process_add ( process ); -} - -/** Process initialiser */ -struct init_fn process_init_fn __init_fn ( INIT_NORMAL ) = { - .initialise = init_processes, -}; |