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