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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (c) 2011 The Chromium OS Authors.
*/
#include <command.h>
#include <console.h>
#include <env.h>
#include <malloc.h>
#include <vsprintf.h>
#include <uthread.h>
/* Spawn arguments and job index */
struct spa {
int argc;
char **argv;
unsigned int job_idx;
};
/*
* uthread group identifiers for each running job
* 0: job slot available, != 0: uthread group id
* Note that job[0] is job_id 1, job[1] is job_id 2 etc.
*/
static unsigned int job[CONFIG_CMD_SPAWN_NUM_JOBS];
/* Return values of the commands run as jobs */
static enum command_ret_t job_ret[CONFIG_CMD_SPAWN_NUM_JOBS];
static void spa_free(struct spa *spa)
{
int i;
if (!spa)
return;
for (i = 0; i < spa->argc; i++)
free(spa->argv[i]);
free(spa->argv);
free(spa);
}
static struct spa *spa_create(int argc, char *const argv[])
{
struct spa *spa;
int i;
spa = calloc(1, sizeof(*spa));
if (!spa)
return NULL;
spa->argc = argc;
spa->argv = malloc(argc * sizeof(char *));
if (!spa->argv)
goto err;
for (i = 0; i < argc; i++) {
spa->argv[i] = strdup(argv[i]);
if (!spa->argv[i])
goto err;
}
return spa;
err:
spa_free(spa);
return NULL;
}
static void spawn_thread(void *arg)
{
struct spa *spa = (struct spa *)arg;
ulong cycles = 0;
int repeatable = 0;
job_ret[spa->job_idx] = cmd_process(0, spa->argc, spa->argv,
&repeatable, &cycles);
spa_free(spa);
}
static unsigned int next_job_id(void)
{
int i;
for (i = 0; i < CONFIG_CMD_SPAWN_NUM_JOBS; i++)
if (!job[i])
return i + 1;
/* No job available */
return 0;
}
static void refresh_jobs(void)
{
int i;
for (i = 0; i < CONFIG_CMD_SPAWN_NUM_JOBS; i++)
if (job[i] && uthread_grp_done(job[i]))
job[i] = 0;
}
static int do_spawn(struct cmd_tbl *cmdtp, int flag, int argc,
char *const argv[])
{
unsigned int id;
unsigned int idx;
struct spa *spa;
int ret;
if (argc == 1)
return CMD_RET_USAGE;
spa = spa_create(argc - 1, argv + 1);
if (!spa)
return CMD_RET_FAILURE;
refresh_jobs();
id = next_job_id();
if (!id)
return CMD_RET_FAILURE;
idx = id - 1;
job[idx] = uthread_grp_new_id();
ret = uthread_create(NULL, spawn_thread, spa, 0, job[idx]);
if (ret) {
job[idx] = 0;
return CMD_RET_FAILURE;
}
ret = env_set_ulong("job_id", id);
if (ret)
return CMD_RET_FAILURE;
return CMD_RET_SUCCESS;
}
U_BOOT_CMD(spawn, CONFIG_SYS_MAXARGS, 0, do_spawn,
"run commands and summarize execution time",
"command [args...]\n");
static enum command_ret_t wait_job(unsigned int idx)
{
int prev = disable_ctrlc(false);
while (!uthread_grp_done(job[idx])) {
if (ctrlc()) {
puts("<INTERRUPT>\n");
disable_ctrlc(prev);
return CMD_RET_FAILURE;
}
uthread_schedule();
}
job[idx] = 0;
disable_ctrlc(prev);
return job_ret[idx];
}
static int do_wait(struct cmd_tbl *cmdtp, int flag, int argc,
char *const argv[])
{
enum command_ret_t ret = CMD_RET_SUCCESS;
unsigned long id;
unsigned int idx;
int i;
if (argc == 1) {
for (i = 0; i < CONFIG_CMD_SPAWN_NUM_JOBS; i++)
if (job[i])
ret = wait_job(i);
} else {
for (i = 1; i < argc; i++) {
id = dectoul(argv[i], NULL);
if (id < 1 || id > CONFIG_CMD_SPAWN_NUM_JOBS)
return CMD_RET_USAGE;
idx = (int)id - 1;
ret = wait_job(idx);
}
}
return ret;
}
U_BOOT_CMD(wait, CONFIG_SYS_MAXARGS, 0, do_wait,
"wait for one or more jobs to complete",
"[job_id ...]\n"
" - Wait until all specified jobs have exited and return the\n"
" exit status of the last job waited for. When no job_id is\n"
" given, wait for all the background jobs.\n");
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