process.c File Reference

Processes. More...

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

Go to the source code of this file.

Functions
	FILE_LICENCE (GPL2_OR_LATER_OR_UBDL)
static	LIST_HEAD (run_queue)
	Process run queue. More...
void *	process_object (struct process *process)
	Get pointer to object containing process. More...
void	process_add (struct process *process)
	Add process to process list. More...
void	process_del (struct process *process)
	Remove process from process list. More...
void	step (void)
	Single-step a single process. More...
static void	init_processes (void)
	Initialise processes. More...
struct init_fn process_init_fn	__init_fn (INIT_NORMAL)
	Process initialiser. More...

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()

FILE_LICENCE

(

GPL2_OR_LATER_OR_UBDL

)

LIST_HEAD()

static LIST_HEAD ( run_queue  )

static

Process run queue.

process_object()

void* process_object

(

struct process *

process

)

Get pointer to object containing process.

Parameters

process

Process

Return values

object

Containing object

Definition at line 47 of file process.c.

                                                  {
        return ( ( ( void * ) process ) - process->desc->offset );
}

References process::desc, and process_descriptor::offset.

Referenced by step().

process_add()

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 59 of file process.c.

                                             {
        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 ) );
        }
}

References DBGC, process::list, list_add_tail, PROC_COL, PROC_DBG, PROC_FMT, process_running(), ref_get, and process::refcnt.

Referenced by efi_local_open(), efi_pxe_udp_schedule_close(), fc_els_request(), fcpcmd_start_send(), gve_restart(), gve_startup(), http_reopen(), hub_complete(), hub_open(), ib_cmrc_close(), imux_probe(), init_processes(), iscsi_tx_resume(), net80211_autoassociate(), peerblk_dequeue(), peerblk_enqueue(), peerblk_retrieval_close(), peerblk_step(), peermux_block_close(), peermux_info_close(), process_init(), sanpath_open(), scsidev_ready(), tcp_close(), tcp_rx(), tls_tx_resume(), usbblk_in_complete(), usbblk_out_complete(), usbblk_start(), validator_xfer_close(), and xcm_reopen().

process_del()

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 79 of file process.c.

                                             {
        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 ) );
        }
}

References DBGC, INIT_LIST_HEAD, process::list, list_del, PROC_COL, PROC_DBG, PROC_FMT, process_running(), ref_put, and process::refcnt.

Referenced by efi_local_close(), efi_pxe_udp_close(), efi_pxe_udp_open(), fc_els_close(), fc_ns_query_close(), fcpcmd_stop_send(), gve_close(), http_close(), hub_close(), hub_refill(), hw_finished(), ib_cmrc_shutdown(), imux_shutdown(), iscsi_close(), iscsi_tx_pause(), net80211_netdev_close(), net80211_step_associate(), peerblk_reset(), peermux_close(), peermux_step(), sanpath_close(), scsidev_close(), step(), tcp_close(), tls_close(), usbblk_stop(), validator_finished(), xcm_close(), xcm_destroy(), and xcm_reopen().

step()

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 98 of file process.c.

                   {
        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 */
        }
}

References DBGC2, desc, process::desc, process::list, list_add_tail, list_del, list_first_entry, PROC_COL, PROC_DBG, PROC_FMT, process_del(), process_object(), ref_get, ref_put, and process::refcnt.

Referenced by ath5k_hw_rf_check_gainf_readback(), ath5k_hw_rf_gainf_corr(), comboot_resolv(), efi_download_poll(), efi_ifr_numeric_op(), efi_pxe_dhcp(), efi_pxe_mtftp(), efi_pxe_udp_read(), gdbmach_set_single_step(), getchar(), getchar_timeout(), int22(), iwlist(), md4_digest(), md5_digest(), monojob_wait(), open(), pxenv_tftp_get_fsize(), pxenv_tftp_open(), pxenv_tftp_read(), pxenv_tftp_read_file(), pxenv_udp_read(), read_user(), sandev_command(), sandev_describe(), sandev_reopen(), select(), sha1_digest(), sleep_interruptible(), spi_bit_transfer(), tcp_shutdown(), x25519_ladder(), and x25519_step().

init_processes()

static void init_processes ( void  )

static

Initialise processes.

Definition at line 127 of file process.c.

                                    {
        struct process *process;

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

References for_each_table_entry, PERMANENT_PROCESSES, and process_add().

__init_fn()

struct init_fn process_init_fn __init_fn

(

INIT_NORMAL

)

Process initialiser.