process.c File Reference

Processes. More...

#include <gpxe/list.h>
#include <gpxe/init.h>
#include <gpxe/process.h>

Go to the source code of this file.

Functions
	FILE_LICENCE (GPL2_OR_LATER)
static	LIST_HEAD (run_queue)
	Process run queue.
void	process_add (struct process *process)
	Add process to process list.
void	process_del (struct process *process)
	Remove process from process list.
void	step (void)
	Single-step a single process.
static void	init_processes (void)
	Initialise processes.
struct init_fn process_init_fn	__init_fn (INIT_NORMAL)
	Process initialiser.

---

Detailed Description

Processes.

We implement a trivial form of cooperative multitasking, in which all processes share a single stack and address space.

Definition in file process.c.

---

Function Documentation

FILE_LICENCE

(

GPL2_OR_LATER

)

static LIST_HEAD

(

run_queue

)

[static]

Process run queue.

void process_add

(

struct process *

process

)

Add process to process list.

Parameters:

process

Process

It is safe to call process_add() multiple times; further calls will have no effect.

Definition at line 44 of file process.c.

References DBGC, process::list, list_add_tail, list_empty(), ref_get(), and process::refcnt.

Referenced by ib_cmrc_close(), init_processes(), net80211_autoassociate(), and process_init().

                                             {
        if ( list_empty ( &process->list ) ) {
                DBGC ( process, "PROCESS %p starting\n", process );
                ref_get ( process->refcnt );
                list_add_tail ( &process->list, &run_queue );
        } else {
                DBGC ( process, "PROCESS %p already started\n", process );
        }
}

void process_del

(

struct process *

process

)

Remove process from process list.

Parameters:

process

Process

It is safe to call process_del() multiple times; further calls will have no effect.

Definition at line 62 of file process.c.

References DBGC, INIT_LIST_HEAD, process::list, list_del, list_empty(), ref_put(), and process::refcnt.

Referenced by http_done(), http_step(), hw_finished(), ib_cmrc_shutdown(), iscsi_detach(), net80211_netdev_close(), net80211_step_associate(), numeric_step(), and tls_close().

                                             {
        if ( ! list_empty ( &process->list ) ) {
                DBGC ( process, "PROCESS %p stopping\n", process );
                list_del ( &process->list );
                INIT_LIST_HEAD ( &process->list );
                ref_put ( process->refcnt );
        } else {
                DBGC ( process, "PROCESS %p already stopped\n", process );
        }
}

void step

(

void

)

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.

Definition at line 79 of file process.c.

References DBGC2, process::list, list_add_tail, list_del, list_for_each_entry, and process::step.

Referenced by aoe_discover(), ata_command(), ath5k_hw_rf_check_gainf_readback(), ath5k_hw_rf_gainf_corr(), comboot_resolv(), getchar(), getchar_timeout(), iflinkwait(), int22(), iwlist(), md5_transform(), monojob_wait(), open(), process_init(), process_init_stopped(), pxe_menu_select(), pxenv_tftp_get_fsize(), pxenv_tftp_open(), pxenv_tftp_read(), pxenv_tftp_read_file(), pxenv_udp_read(), read_user(), scsi_command(), select(), and spi_bit_transfer().

                   {
        struct process *process;

        list_for_each_entry ( process, &run_queue, list ) {
                list_del ( &process->list );
                list_add_tail ( &process->list, &run_queue );
                DBGC2 ( process, "PROCESS %p executing\n", process );
                process->step ( process );
                DBGC2 ( process, "PROCESS %p finished executing\n", process );
                break;
        }
}

static void init_processes

(

void

)

[static]

Initialise processes.

Definition at line 96 of file process.c.

References for_each_table_entry, PERMANENT_PROCESSES, and process_add().

                                    {
        struct process *process;

        for_each_table_entry ( process, PERMANENT_PROCESSES )
                process_add ( process );
}

struct init_fn process_init_fn __init_fn

(

INIT_NORMAL

)

[read]

Process initialiser.