source: mainline/uspace/srv/sysman/sysman.c@ 4fe7fcb

#include <adt/list.h>
#include <errno.h>

#include "dep.h"
#include "job.h"
#include "sysman.h"

/** Create jobs for cluser of given unit.
 *
 * @note Using recursion, limits "depth" of dependency graph.
 */
static int sysman_create_closure_jobs(unit_t *unit, job_t **entry_job_ptr,
    list_t *accumulator, job_type_t type)
{
        int rc = EOK;
        job_t *job = job_create(type);
        if (job == NULL) {
                rc = ENOMEM;
                goto fail;
        }

        job->unit = unit;

        list_foreach(unit->dependencies, dependencies, unit_dependency_t, edge) {
                job_t *blocking_job = NULL;
                rc = sysman_create_closure_jobs(edge->dependency, &blocking_job,
                    accumulator, type);
                if (rc != EOK) {
                        goto fail;
                }
                
                rc = job_add_blocking_job(job, blocking_job);
                if (rc != EOK) {
                        goto fail;
                }
        }

        /* Job is passed to the accumulator, i.e. no add_ref. */
        list_append(&job->link, accumulator);

        if (entry_job_ptr != NULL) {
                *entry_job_ptr = job;
        }
        return EOK;

fail:
        job_del_ref(&job);
        return rc;
}

int sysman_unit_start(unit_t *unit)
{
        list_t new_jobs;
        list_initialize(&new_jobs);

        job_t *job = NULL;
        int rc = sysman_create_closure_jobs(unit, &job, &new_jobs, JOB_START);
        if (rc != EOK) {
                return rc;
        }

        // TODO handle errors when adding job accumulator
        job_queue_jobs(&new_jobs);

        return job_wait(job);
}