267 lines
7.6 KiB
C
267 lines
7.6 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, Name *name) {
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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(name);
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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->name = name;
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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->linked) {
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if (j->name->meta.job == j)
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j->name->meta.job = NULL;
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hashmap_remove(j->manager->jobs, UINT32_TO_PTR(j->id));
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}
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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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l->subject_next = subject->subject_list;
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subject->subject_list = l;
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} else {
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l->subject_next = object->manager->transaction_anchor;
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object->manager->transaction_anchor = l;
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}
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if (l->subject_next)
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l->subject_next->subject_prev = l;
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l->subject_prev = NULL;
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if ((l->object_next = object->object_list))
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l->object_next->object_prev = l;
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l->object_prev = NULL;
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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_prev)
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l->subject_prev->subject_next = l->subject_next;
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else if (l->subject)
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l->subject->subject_list = l->subject_next;
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else
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l->object->manager->transaction_anchor = l->subject_next;
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if (l->subject_next)
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l->subject_next->subject_prev = l->subject_prev;
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if (l->object_prev)
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l->object_prev->object_next = l->object_next;
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else
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l->object->object_list = l->object_next;
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if (l->object_next)
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l->object_next->object_prev = l->object_prev;
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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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for (l = object->object_list; l; l = l->object_next) {
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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_STOP] = "stop",
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[JOB_VERIFY_STARTED] = "verify-started",
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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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[JOB_DONE] = "done"
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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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"%sJob %u:\n"
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"%s\tAction: %s → %s\n"
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"%s\tState: %s\n",
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prefix, j->id,
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prefix, name_id(j->name), job_type_to_string(j->type),
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prefix, job_state_table[j->state]);
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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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for (l = j->object_list; l; l = l->object_next)
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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_STARTED))
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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_STARTED, 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_STARTED, 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_STARTED, JOB_RELOAD))
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*a = JOB_RELOAD;
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else if (types_match(*a, b, JOB_VERIFY_STARTED, 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_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 */
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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_STARTED;
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case JOB_RELOAD:
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return b == JOB_VERIFY_STARTED;
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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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case JOB_RESTART:
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return
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b == JOB_START ||
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b == JOB_VERIFY_STARTED ||
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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_STARTED ||
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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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