474 lines
15 KiB
C
474 lines
15 KiB
C
/*-*- Mode: C; c-basic-offset: 8 -*-*/
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#include <assert.h>
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#include <errno.h>
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#include "macro.h"
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#include "job.h"
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Job* job_new(Manager *m, JobType type, Unit *unit) {
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Job *j;
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assert(m);
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assert(type < _JOB_TYPE_MAX);
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assert(unit);
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if (!(j = new0(Job, 1)))
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return NULL;
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j->manager = m;
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j->id = m->current_job_id++;
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j->type = type;
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j->unit = unit;
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/* We don't link it here, that's what job_dependency() is for */
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return j;
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}
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void job_free(Job *j) {
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assert(j);
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/* Detach from next 'bigger' objects */
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if (j->installed) {
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if (j->unit->meta.job == j)
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j->unit->meta.job = NULL;
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hashmap_remove(j->manager->jobs, UINT32_TO_PTR(j->id));
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j->installed = false;
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}
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/* Detach from next 'smaller' objects */
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manager_transaction_unlink_job(j->manager, j);
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free(j);
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}
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JobDependency* job_dependency_new(Job *subject, Job *object, bool matters) {
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JobDependency *l;
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assert(object);
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/* Adds a new job link, which encodes that the 'subject' job
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* needs the 'object' job in some way. If 'subject' is NULL
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* this means the 'anchor' job (i.e. the one the user
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* explcitily asked for) is the requester. */
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if (!(l = new0(JobDependency, 1)))
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return NULL;
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l->subject = subject;
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l->object = object;
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l->matters = matters;
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if (subject)
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LIST_PREPEND(JobDependency, subject, subject->subject_list, l);
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else
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LIST_PREPEND(JobDependency, subject, object->manager->transaction_anchor, l);
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LIST_PREPEND(JobDependency, object, object->object_list, l);
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return l;
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}
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void job_dependency_free(JobDependency *l) {
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assert(l);
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if (l->subject)
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LIST_REMOVE(JobDependency, subject, l->subject->subject_list, l);
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else
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LIST_REMOVE(JobDependency, subject, l->object->manager->transaction_anchor, l);
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LIST_REMOVE(JobDependency, object, l->object->object_list, l);
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free(l);
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}
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void job_dependency_delete(Job *subject, Job *object, bool *matters) {
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JobDependency *l;
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assert(object);
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LIST_FOREACH(object, l, object->object_list) {
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assert(l->object == object);
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if (l->subject == subject)
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break;
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}
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if (!l) {
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if (matters)
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*matters = false;
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return;
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}
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if (matters)
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*matters = l->matters;
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job_dependency_free(l);
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}
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const char* job_type_to_string(JobType t) {
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static const char* const job_type_table[_JOB_TYPE_MAX] = {
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[JOB_START] = "start",
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[JOB_VERIFY_ACTIVE] = "verify-active",
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[JOB_STOP] = "stop",
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[JOB_RELOAD] = "reload",
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[JOB_RELOAD_OR_START] = "reload-or-start",
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[JOB_RESTART] = "restart",
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[JOB_TRY_RESTART] = "try-restart",
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};
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if (t < 0 || t >= _JOB_TYPE_MAX)
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return "n/a";
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return job_type_table[t];
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}
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void job_dump(Job *j, FILE*f, const char *prefix) {
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static const char* const job_state_table[_JOB_STATE_MAX] = {
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[JOB_WAITING] = "waiting",
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[JOB_RUNNING] = "running"
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};
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assert(j);
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assert(f);
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fprintf(f,
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"%s→ Job %u:\n"
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"%s\tAction: %s → %s\n"
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"%s\tState: %s\n"
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"%s\tForced: %s\n",
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prefix, j->id,
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prefix, unit_id(j->unit), job_type_to_string(j->type),
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prefix, job_state_table[j->state],
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prefix, yes_no(j->forced));
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}
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bool job_is_anchor(Job *j) {
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JobDependency *l;
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assert(j);
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LIST_FOREACH(object, l, j->object_list)
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if (!l->subject)
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return true;
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return false;
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}
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static bool types_match(JobType a, JobType b, JobType c, JobType d) {
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return
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(a == c && b == d) ||
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(a == d && b == c);
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}
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int job_type_merge(JobType *a, JobType b) {
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if (*a == b)
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return 0;
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/* Merging is associative! a merged with b merged with c is
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* the same as a merged with c merged with b. */
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/* Mergeability is transitive! if a can be merged with b and b
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* with c then a also with c */
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/* Also, if a merged with b cannot be merged with c, then
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* either a or b cannot be merged with c either */
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if (types_match(*a, b, JOB_START, JOB_VERIFY_ACTIVE))
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*a = JOB_START;
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else if (types_match(*a, b, JOB_START, JOB_RELOAD) ||
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types_match(*a, b, JOB_START, JOB_RELOAD_OR_START) ||
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types_match(*a, b, JOB_VERIFY_ACTIVE, JOB_RELOAD_OR_START) ||
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types_match(*a, b, JOB_RELOAD, JOB_RELOAD_OR_START))
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*a = JOB_RELOAD_OR_START;
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else if (types_match(*a, b, JOB_START, JOB_RESTART) ||
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types_match(*a, b, JOB_START, JOB_TRY_RESTART) ||
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types_match(*a, b, JOB_VERIFY_ACTIVE, JOB_RESTART) ||
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types_match(*a, b, JOB_RELOAD, JOB_RESTART) ||
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types_match(*a, b, JOB_RELOAD_OR_START, JOB_RESTART) ||
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types_match(*a, b, JOB_RELOAD_OR_START, JOB_TRY_RESTART) ||
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types_match(*a, b, JOB_RESTART, JOB_TRY_RESTART))
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*a = JOB_RESTART;
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else if (types_match(*a, b, JOB_VERIFY_ACTIVE, JOB_RELOAD))
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*a = JOB_RELOAD;
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else if (types_match(*a, b, JOB_VERIFY_ACTIVE, JOB_TRY_RESTART) ||
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types_match(*a, b, JOB_RELOAD, JOB_TRY_RESTART))
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*a = JOB_TRY_RESTART;
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else
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return -EEXIST;
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return 0;
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}
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bool job_type_is_mergeable(JobType a, JobType b) {
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return job_type_merge(&a, b) >= 0;
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}
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bool job_type_is_superset(JobType a, JobType b) {
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/* Checks whether operation a is a "superset" of b in its
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* actions */
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if (a == b)
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return true;
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switch (a) {
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case JOB_START:
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return b == JOB_VERIFY_ACTIVE;
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case JOB_RELOAD:
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return
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b == JOB_VERIFY_ACTIVE;
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case JOB_RELOAD_OR_START:
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return
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b == JOB_RELOAD ||
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b == JOB_START ||
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b == JOB_VERIFY_ACTIVE;
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case JOB_RESTART:
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return
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b == JOB_START ||
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b == JOB_VERIFY_ACTIVE ||
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b == JOB_RELOAD ||
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b == JOB_RELOAD_OR_START ||
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b == JOB_TRY_RESTART;
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case JOB_TRY_RESTART:
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return
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b == JOB_VERIFY_ACTIVE ||
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b == JOB_RELOAD;
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default:
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return false;
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}
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}
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bool job_type_is_conflicting(JobType a, JobType b) {
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assert(a >= 0 && a < _JOB_TYPE_MAX);
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assert(b >= 0 && b < _JOB_TYPE_MAX);
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return (a == JOB_STOP) != (b == JOB_STOP);
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}
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bool job_is_runnable(Job *j) {
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Iterator i;
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Unit *other;
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assert(j);
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assert(j->installed);
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/* Checks whether there is any job running for the units this
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* job needs to be running after (in the case of a 'positive'
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* job type) or before (in the case of a 'negative' job type
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* . */
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if (j->type == JOB_START ||
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j->type == JOB_VERIFY_ACTIVE ||
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j->type == JOB_RELOAD ||
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j->type == JOB_RELOAD_OR_START) {
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/* Immediate result is that the job is or might be
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* started. In this case lets wait for the
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* dependencies, regardless whether they are
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* starting or stopping something. */
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SET_FOREACH(other, j->unit->meta.dependencies[UNIT_AFTER], i)
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if (other->meta.job)
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return false;
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}
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/* Also, if something else is being stopped and we should
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* change state after it, then lets wait. */
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SET_FOREACH(other, j->unit->meta.dependencies[UNIT_BEFORE], i)
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if (other->meta.job &&
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(other->meta.job->type == JOB_STOP ||
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other->meta.job->type == JOB_RESTART ||
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other->meta.job->type == JOB_TRY_RESTART))
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return false;
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/* This means that for a service a and a service b where b
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* shall be started after a:
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*
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* start a + start b → 1st step start a, 2nd step start b
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* start a + stop b → 1st step stop b, 2nd step start a
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* stop a + start b → 1st step stop a, 2nd step start b
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* stop a + stop b → 1st step stop b, 2nd step stop a
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*
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* This has the side effect that restarts are properly
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* synchronized too. */
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return true;
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}
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int job_run_and_invalidate(Job *j) {
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int r;
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assert(j);
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assert(j->installed);
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if (j->in_run_queue) {
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LIST_REMOVE(Job, run_queue, j->manager->run_queue, j);
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j->in_run_queue = false;
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}
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if (j->state != JOB_WAITING)
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return 0;
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if (!job_is_runnable(j))
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return -EAGAIN;
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j->state = JOB_RUNNING;
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switch (j->type) {
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case JOB_START:
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r = unit_start(j->unit);
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if (r == -EBADR)
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r = 0;
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break;
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case JOB_VERIFY_ACTIVE: {
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UnitActiveState t = unit_active_state(j->unit);
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if (UNIT_IS_ACTIVE_OR_RELOADING(t))
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r = -EALREADY;
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else if (t == UNIT_ACTIVATING)
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r = -EAGAIN;
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else
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r = -ENOEXEC;
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break;
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}
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case JOB_STOP:
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r = unit_stop(j->unit);
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break;
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case JOB_RELOAD:
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r = unit_reload(j->unit);
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break;
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case JOB_RELOAD_OR_START:
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if (unit_active_state(j->unit) == UNIT_ACTIVE)
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r = unit_reload(j->unit);
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else
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r = unit_start(j->unit);
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break;
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case JOB_RESTART: {
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UnitActiveState t = unit_active_state(j->unit);
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if (t == UNIT_INACTIVE || t == UNIT_ACTIVATING) {
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j->type = JOB_START;
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r = unit_start(j->unit);
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} else
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r = unit_stop(j->unit);
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break;
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}
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case JOB_TRY_RESTART: {
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UnitActiveState t = unit_active_state(j->unit);
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if (t == UNIT_INACTIVE || t == UNIT_DEACTIVATING)
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r = -ENOEXEC;
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else if (t == UNIT_ACTIVATING) {
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j->type = JOB_START;
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r = unit_start(j->unit);
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} else
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r = unit_stop(j->unit);
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break;
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}
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default:
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assert_not_reached("Unknown job type");
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}
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if (r == -EALREADY)
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r = job_finish_and_invalidate(j, true);
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else if (r == -EAGAIN) {
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j->state = JOB_WAITING;
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return -EAGAIN;
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} else if (r < 0)
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r = job_finish_and_invalidate(j, false);
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return r;
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}
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int job_finish_and_invalidate(Job *j, bool success) {
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Unit *u;
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Unit *other;
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UnitType t;
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Iterator i;
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assert(j);
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assert(j->installed);
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/* Patch restart jobs so that they become normal start jobs */
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if (success && (j->type == JOB_RESTART || j->type == JOB_TRY_RESTART)) {
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j->state = JOB_RUNNING;
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j->type = JOB_START;
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job_schedule_run(j);
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return 0;
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}
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u = j->unit;
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t = j->type;
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job_free(j);
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/* Fail depending jobs on failure */
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if (!success) {
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if (t == JOB_START ||
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t == JOB_VERIFY_ACTIVE ||
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t == JOB_RELOAD_OR_START) {
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SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRED_BY], i)
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if (other->meta.job &&
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(other->meta.type == JOB_START ||
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other->meta.type == JOB_VERIFY_ACTIVE ||
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other->meta.type == JOB_RELOAD_OR_START))
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job_finish_and_invalidate(other->meta.job, false);
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SET_FOREACH(other, u->meta.dependencies[UNIT_SOFT_REQUIRED_BY], i)
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if (other->meta.job &&
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!other->meta.job->forced &&
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(other->meta.type == JOB_START ||
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other->meta.type == JOB_VERIFY_ACTIVE ||
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other->meta.type == JOB_RELOAD_OR_START))
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job_finish_and_invalidate(other->meta.job, false);
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} else if (t == JOB_STOP) {
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SET_FOREACH(other, u->meta.dependencies[UNIT_CONFLICTS], i)
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if (other->meta.job &&
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(t == JOB_START ||
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t == JOB_VERIFY_ACTIVE ||
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t == JOB_RELOAD_OR_START))
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job_finish_and_invalidate(other->meta.job, false);
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}
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}
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/* Try to start the next jobs that can be started */
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SET_FOREACH(other, u->meta.dependencies[UNIT_AFTER], i)
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if (other->meta.job)
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job_schedule_run(other->meta.job);
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SET_FOREACH(other, u->meta.dependencies[UNIT_BEFORE], i)
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if (other->meta.job)
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job_schedule_run(other->meta.job);
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return 0;
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}
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void job_schedule_run(Job *j) {
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assert(j);
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assert(j->installed);
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if (j->in_run_queue)
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return;
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LIST_PREPEND(Job, run_queue, j->manager->run_queue, j);
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j->in_run_queue = true;
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}
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