src/core/job.h

   1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
   2
   3 #ifndef foojobhfoo
   4 #define foojobhfoo
   5
   6 /***
   7   This file is part of systemd.
   8
   9   Copyright 2010 Lennart Poettering
  10
  11   systemd is free software; you can redistribute it and/or modify it
  12   under the terms of the GNU Lesser General Public License as published by
  13   the Free Software Foundation; either version 2.1 of the License, or
  14   (at your option) any later version.
  15
  16   systemd is distributed in the hope that it will be useful, but
  17   WITHOUT ANY WARRANTY; without even the implied warranty of
  18   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  19   Lesser General Public License for more details.
  20
  21   You should have received a copy of the GNU Lesser General Public License
  22   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  23 ***/
  24
  25 #include <stdbool.h>
  26 #include <inttypes.h>
  27 #include <errno.h>
  28
  29 typedef struct Job Job;
  30 typedef struct JobDependency JobDependency;
  31 typedef enum JobType JobType;
  32 typedef enum JobState JobState;
  33 typedef enum JobMode JobMode;
  34 typedef enum JobResult JobResult;
  35
  36 #include "manager.h"
  37 #include "unit.h"
  38 #include "hashmap.h"
  39 #include "list.h"
  40
  41 /* Be careful when changing the job types! Adjust job_merging_table[] accordingly! */
  42 enum JobType {
  43         JOB_START,                  /* if a unit does not support being started, we'll just wait until it becomes active */
  44         JOB_VERIFY_ACTIVE,
  45
  46         JOB_STOP,
  47
  48         JOB_RELOAD,                 /* if running reload */
  49         JOB_RELOAD_OR_START,        /* if running reload, if not running start */
  50
  51         /* Note that restarts are first treated like JOB_STOP, but
  52          * then instead of finishing are patched to become
  53          * JOB_START. */
  54         JOB_RESTART,                /* if running stop, then start unconditionally */
  55         JOB_TRY_RESTART,            /* if running stop and then start */
  56
  57         _JOB_TYPE_MAX,
  58         _JOB_TYPE_INVALID = -1
  59 };
  60
  61 enum JobState {
  62         JOB_WAITING,
  63         JOB_RUNNING,
  64         _JOB_STATE_MAX,
  65         _JOB_STATE_INVALID = -1
  66 };
  67
  68 enum JobMode {
  69         JOB_FAIL,                /* Fail if a conflicting job is already queued */
  70         JOB_REPLACE,             /* Replace an existing conflicting job */
  71         JOB_ISOLATE,             /* Start a unit, and stop all others */
  72         JOB_IGNORE_DEPENDENCIES, /* Ignore both requirement and ordering dependencies */
  73         JOB_IGNORE_REQUIREMENTS, /* Ignore requirement dependencies */
  74         _JOB_MODE_MAX,
  75         _JOB_MODE_INVALID = -1
  76 };
  77
  78 enum JobResult {
  79         JOB_DONE,
  80         JOB_CANCELED,
  81         JOB_TIMEOUT,
  82         JOB_FAILED,
  83         JOB_DEPENDENCY,
  84         JOB_SKIPPED,
  85         _JOB_RESULT_MAX,
  86         _JOB_RESULT_INVALID = -1
  87 };
  88
  89 struct JobDependency {
  90         /* Encodes that the 'subject' job needs the 'object' job in
  91          * some way. This structure is used only while building a transaction. */
  92         Job *subject;
  93         Job *object;
  94
  95         LIST_FIELDS(JobDependency, subject);
  96         LIST_FIELDS(JobDependency, object);
  97
  98         bool matters;
  99         bool conflicts;
 100 };
 101
 102 struct Job {
 103         Manager *manager;
 104         Unit *unit;
 105
 106         LIST_FIELDS(Job, transaction);
 107         LIST_FIELDS(Job, run_queue);
 108         LIST_FIELDS(Job, dbus_queue);
 109
 110         LIST_HEAD(JobDependency, subject_list);
 111         LIST_HEAD(JobDependency, object_list);
 112
 113         /* Used for graph algs as a "I have been here" marker */
 114         Job* marker;
 115         unsigned generation;
 116
 117         uint32_t id;
 118
 119         JobType type;
 120         JobState state;
 121
 122         Watch timer_watch;
 123
 124         /* Note that this bus object is not ref counted here. */
 125         DBusConnection *bus;
 126         char *bus_client;
 127
 128         JobResult result;
 129
 130         bool installed:1;
 131         bool in_run_queue:1;
 132         bool matters_to_anchor:1;
 133         bool override:1;
 134         bool in_dbus_queue:1;
 135         bool sent_dbus_new_signal:1;
 136         bool ignore_order:1;
 137 };
 138
 139 Job* job_new(Manager *m, JobType type, Unit *unit);
 140 void job_free(Job *job);
 141 void job_dump(Job *j, FILE*f, const char *prefix);
 142
 143 JobDependency* job_dependency_new(Job *subject, Job *object, bool matters, bool conflicts);
 144 void job_dependency_free(JobDependency *l);
 145
 146 bool job_is_anchor(Job *j);
 147
 148 int job_merge(Job *j, Job *other);
 149
 150 JobType job_type_lookup_merge(JobType a, JobType b);
 151
 152 static inline int job_type_merge(JobType *a, JobType b) {
 153         JobType t = job_type_lookup_merge(*a, b);
 154         if (t < 0)
 155                 return -EEXIST;
 156         *a = t;
 157         return 0;
 158 }
 159
 160 static inline bool job_type_is_mergeable(JobType a, JobType b) {
 161         return job_type_lookup_merge(a, b) >= 0;
 162 }
 163
 164 static inline bool job_type_is_conflicting(JobType a, JobType b) {
 165         return !job_type_is_mergeable(a, b);
 166 }
 167
 168 static inline bool job_type_is_superset(JobType a, JobType b) {
 169         /* Checks whether operation a is a "superset" of b in its actions */
 170         return a == job_type_lookup_merge(a, b);
 171 }
 172
 173 bool job_type_is_redundant(JobType a, UnitActiveState b);
 174
 175 bool job_is_runnable(Job *j);
 176
 177 void job_add_to_run_queue(Job *j);
 178 void job_add_to_dbus_queue(Job *j);
 179
 180 int job_start_timer(Job *j);
 181 void job_timer_event(Job *j, uint64_t n_elapsed, Watch *w);
 182
 183 int job_run_and_invalidate(Job *j);
 184 int job_finish_and_invalidate(Job *j, JobResult result);
 185
 186 char *job_dbus_path(Job *j);
 187
 188 const char* job_type_to_string(JobType t);
 189 JobType job_type_from_string(const char *s);
 190
 191 const char* job_state_to_string(JobState t);
 192 JobState job_state_from_string(const char *s);
 193
 194 const char* job_mode_to_string(JobMode t);
 195 JobMode job_mode_from_string(const char *s);
 196
 197 const char* job_result_to_string(JobResult t);
 198 JobResult job_result_from_string(const char *s);
 199
 200 #endif