job.c

   1 /*-*- Mode: C; c-basic-offset: 8 -*-*/
   2
   3 #include <assert.h>
   4
   5 #include "macro.h"
   6 #include "job.h"
   7
   8 Job* job_new(Manager *m, JobType type, Name *name) {
   9         Job *j;
  10
  11         assert(m);
  12         assert(type < _JOB_TYPE_MAX);
  13         assert(name);
  14
  15         if (!(j = new0(Job, 1)))
  16                 return NULL;
  17
  18         j->manager = m;
  19         j->id = m->current_job_id++;
  20         j->type = type;
  21         j->name = name;
  22
  23         /* We don't link it here, that's what job_dependency() is for */
  24
  25         return j;
  26 }
  27
  28 void job_free(Job *j) {
  29         assert(j);
  30
  31         /* Detach from next 'bigger' objects */
  32
  33         if (j->linked) {
  34                 if (j->name->meta.job == j)
  35                         j->name->meta.job = NULL;
  36
  37                 hashmap_remove(j->manager->jobs, UINT32_TO_PTR(j->id));
  38         }
  39
  40         manager_transaction_unlink_job(j->manager, j);
  41
  42         free(j);
  43 }
  44
  45 JobDependency* job_dependency_new(Job *subject, Job *object, bool matters) {
  46         JobDependency *l;
  47
  48         assert(object);
  49
  50         /* Adds a new job link, which encodes that the 'subject' job
  51          * needs the 'object' job in some way. If 'subject' is NULL
  52          * this means the 'anchor' job (i.e. the one the user
  53          * explcitily asked for) is the requester. */
  54
  55         if (!(l = new0(JobDependency, 1)))
  56                 return NULL;
  57
  58         l->subject = subject;
  59         l->object = object;
  60         l->matters = matters;
  61
  62         if (subject) {
  63                 l->subject_next = subject->subject_list;
  64                 subject->subject_list = l;
  65         } else {
  66                 l->subject_next = object->manager->transaction_anchor;
  67                 object->manager->transaction_anchor = l;
  68         }
  69
  70         if (l->subject_next)
  71                 l->subject_next->subject_prev = l;
  72         l->subject_prev = NULL;
  73
  74         if ((l->object_next = object->object_list))
  75                 l->object_next->object_prev = l;
  76         l->object_prev = NULL;
  77         object->object_list = l;
  78
  79         return l;
  80 }
  81
  82 void job_dependency_free(JobDependency *l) {
  83         assert(l);
  84
  85         if (l->subject_prev)
  86                 l->subject_prev->subject_next = l->subject_next;
  87         else if (l->subject)
  88                 l->subject->subject_list = l->subject_next;
  89         else
  90                 l->object->manager->transaction_anchor = l->subject_next;
  91
  92         if (l->subject_next)
  93                 l->subject_next->subject_prev = l->subject_prev;
  94
  95         if (l->object_prev)
  96                 l->object_prev->object_next = l->object_next;
  97         else
  98                 l->object->object_list = l->object_next;
  99
 100         if (l->object_next)
 101                 l->object_next->object_prev = l->object_prev;
 102
 103         free(l);
 104 }
 105
 106 void job_dependency_delete(Job *subject, Job *object, bool *matters) {
 107         JobDependency *l;
 108
 109         assert(object);
 110
 111         for (l = object->object_list; l; l = l->object_next) {
 112                 assert(l->object == object);
 113
 114                 if (l->subject == subject)
 115                         break;
 116         }
 117
 118         if (!l) {
 119                 if (matters)
 120                         *matters = false;
 121                 return;
 122         }
 123
 124         if (matters)
 125                 *matters = l->matters;
 126
 127         job_dependency_free(l);
 128 }
 129
 130 void job_dump(Job *j, FILE*f, const char *prefix) {
 131
 132         static const char* const job_type_table[_JOB_TYPE_MAX] = {
 133                 [JOB_START] = "start",
 134                 [JOB_STOP] = "stop",
 135                 [JOB_VERIFY_STARTED] = "verify-started",
 136                 [JOB_RELOAD] = "reload",
 137                 [JOB_RELOAD_OR_START] = "reload-or-start",
 138                 [JOB_RESTART] = "restart",
 139                 [JOB_TRY_RESTART] = "try-restart",
 140         };
 141
 142         static const char* const job_state_table[_JOB_STATE_MAX] = {
 143                 [JOB_WAITING] = "waiting",
 144                 [JOB_RUNNING] = "running",
 145                 [JOB_DONE] = "done"
 146         };
 147
 148         assert(j);
 149         assert(f);
 150
 151         fprintf(f,
 152                 "%sJob %u:\n"
 153                 "%s\tAction: %s → %s\n"
 154                 "%s\tState: %s\n",
 155                 prefix, j->id,
 156                 prefix, name_id(j->name), job_type_table[j->type],
 157                 prefix, job_state_table[j->state]);
 158 }
 159
 160 bool job_is_anchor(Job *j) {
 161         JobDependency *l;
 162
 163         assert(j);
 164
 165         for (l = j->object_list; l; l = l->object_next)
 166                 if (!l->subject)
 167                         return true;
 168
 169         return false;
 170 }