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92 lines
2.1 KiB
C
92 lines
2.1 KiB
C
#ifndef _IPXE_PROCESS_H
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#define _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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*/
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FILE_LICENCE ( GPL2_OR_LATER );
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#include <ipxe/list.h>
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#include <ipxe/refcnt.h>
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#include <ipxe/tables.h>
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/** A process */
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struct process {
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/** List of processes */
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struct list_head list;
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/**
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* Single-step the process
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*
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* This method should execute a single step of the process.
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* Returning from this method is isomorphic to yielding the
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* CPU to another process.
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*/
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void ( * step ) ( struct process *process );
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/** Reference counter
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*
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* If this interface is not part of a reference-counted
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* object, this field may be NULL.
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*/
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struct refcnt *refcnt;
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};
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extern void process_add ( struct process *process );
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extern void process_del ( struct process *process );
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extern void step ( void );
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/**
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* Initialise process without adding to process list
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*
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* @v process Process
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* @v step Process' step() method
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*/
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static inline __attribute__ (( always_inline )) void
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process_init_stopped ( struct process *process,
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void ( * step ) ( struct process *process ),
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struct refcnt *refcnt ) {
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INIT_LIST_HEAD ( &process->list );
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process->step = step;
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process->refcnt = refcnt;
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}
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/**
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* Initialise process and add to process list
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*
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* @v process Process
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* @v step Process' step() method
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*/
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static inline __attribute__ (( always_inline )) void
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process_init ( struct process *process,
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void ( * step ) ( struct process *process ),
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struct refcnt *refcnt ) {
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process_init_stopped ( process, step, refcnt );
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process_add ( process );
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}
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/**
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* Check if process is running
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*
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* @v process Process
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* @ret running Process is running
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*/
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static inline __attribute__ (( always_inline )) int
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process_running ( struct process *process ) {
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return ( ! list_empty ( &process->list ) );
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}
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/** Permanent process table */
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#define PERMANENT_PROCESSES __table ( struct process, "processes" )
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/**
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* Declare a permanent process
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*
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* Permanent processes will be automatically added to the process list
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* at initialisation time.
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*/
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#define __permanent_process __table_entry ( PERMANENT_PROCESSES, 01 )
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#endif /* _IPXE_PROCESS_H */
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