unit: reduce heap usage for unit objects

[elogind.git] / src / unit.h

diff --git a/src/unit.h b/src/unit.h
index 1c8cf6387018efed910bcb6353bf3b5498556382..626bdc43af6b1a793a99d9f0c6011c93940cffa3 100644 (file)
--- a/src/unit.h
+++ b/src/unit.h
@@ -32,6 +32,7 @@ typedef enum UnitType UnitType;
 typedef enum UnitLoadState UnitLoadState;
 typedef enum UnitActiveState UnitActiveState;
 typedef enum UnitDependency UnitDependency;
+typedef struct UnitRef UnitRef;
 
 #include "set.h"
 #include "util.h"
@@ -39,6 +40,7 @@ typedef enum UnitDependency UnitDependency;
 #include "socket-util.h"
 #include "execute.h"
 #include "condition.h"
+#include "install.h"
 
 enum UnitType {
         UNIT_SERVICE = 0,
@@ -118,6 +120,14 @@ enum UnitDependency {
         /* On Failure */
         UNIT_ON_FAILURE,
 
+        /* Triggers (i.e. a socket triggers a service) */
+        UNIT_TRIGGERS,
+        UNIT_TRIGGERED_BY,
+
+        /* Propagate reloads */
+        UNIT_PROPAGATE_RELOAD_TO,
+        UNIT_PROPAGATE_RELOAD_FROM,
+
         /* Reference information for GC logic */
         UNIT_REFERENCES,              /* Inverse of 'references' is 'referenced_by' */
         UNIT_REFERENCED_BY,
@@ -129,6 +139,7 @@ enum UnitDependency {
 #include "manager.h"
 #include "job.h"
 #include "cgroup.h"
+#include "cgroup-attr.h"
 
 struct Meta {
         Manager *manager;
@@ -154,6 +165,9 @@ struct Meta {
 
         usec_t job_timeout;
 
+        /* References to this */
+        LIST_HEAD(UnitRef, refs);
+
         /* Conditions to check */
         LIST_HEAD(Condition, conditions);
 
@@ -166,6 +180,7 @@ struct Meta {
 
         /* Counterparts in the cgroup filesystem */
         CGroupBonding *cgroup_bondings;
+        CGroupAttribute *cgroup_attributes;
 
         /* Per type list */
         LIST_FIELDS(Meta, units_by_type);
@@ -192,6 +207,9 @@ struct Meta {
         /* Error code when we didn't manage to load the unit (negative) */
         int load_error;
 
+        /* Cached unit file state */
+        UnitFileState unit_file_state;
+
         /* Garbage collect us we nobody wants or requires us anymore */
         bool stop_when_unneeded;
 
@@ -231,6 +249,15 @@ struct Meta {
         bool in_audit:1;
 };
 
+struct UnitRef {
+        /* Keeps tracks of references to a unit. This is useful so
+         * that we can merge two units if necessary and correct all
+         * references to them */
+
+        Unit* unit;
+        LIST_FIELDS(UnitRef, refs);
+};
+
 #include "service.h"
 #include "timer.h"
 #include "socket.h"
@@ -259,6 +286,13 @@ union Unit {
 struct UnitVTable {
         const char *suffix;
 
+        /* How much memory does an object of this unit type need */
+        size_t object_size;
+
+        /* Config file sections this unit type understands, separated
+         * by NUL chars */
+        const char *sections;
+
         /* This should reset all type-specific variables. This should
          * not allocate memory, and is called with zero-initialized
          * data. It should hence only initialize variables that need
@@ -317,6 +351,9 @@ struct UnitVTable {
         void (*sigchld_event)(Unit *u, pid_t pid, int code, int status);
         void (*timer_event)(Unit *u, uint64_t n_elapsed, Watch *w);
 
+        /* Check whether unit needs a daemon reload */
+        bool (*need_daemon_reload)(Unit *u);
+
         /* Reset failed state if we are in failed state */
         void (*reset_failed)(Unit *u);
 
@@ -401,7 +438,7 @@ DEFINE_CAST(SNAPSHOT, Snapshot);
 DEFINE_CAST(SWAP, Swap);
 DEFINE_CAST(PATH, Path);
 
-Unit *unit_new(Manager *m);
+Unit *unit_new(Manager *m, size_t size);
 void unit_free(Unit *u);
 
 int unit_add_name(Unit *u, const char *name);
@@ -421,6 +458,7 @@ int unit_add_cgroup(Unit *u, CGroupBonding *b);
 int unit_add_cgroup_from_text(Unit *u, const char *name);
 int unit_add_default_cgroups(Unit *u);
 CGroupBonding* unit_get_default_cgroup(Unit *u);
+int unit_add_cgroup_attribute(Unit *u, const char *controller, const char *name, const char *value, CGroupAttributeMapCallback map_callback);
 
 int unit_choose_id(Unit *u, const char *name);
 int unit_set_description(Unit *u, const char *description);
@@ -498,7 +536,7 @@ int unit_add_node_link(Unit *u, const char *what, bool wants);
 
 int unit_coldplug(Unit *u);
 
-void unit_status_printf(Unit *u, const char *format, ...);
+void unit_status_printf(Unit *u, const char *status, const char *format, ...);
 
 bool unit_need_daemon_reload(Unit *u);
 
@@ -520,6 +558,13 @@ void unit_trigger_on_failure(Unit *u);
 
 bool unit_condition_test(Unit *u);
 
+UnitFileState unit_get_unit_file_state(Unit *u);
+
+Unit* unit_ref_set(UnitRef *ref, Unit *u);
+void unit_ref_unset(UnitRef *ref);
+
+#define UNIT_DEREF(ref) ((ref).unit)
+
 const char *unit_load_state_to_string(UnitLoadState i);
 UnitLoadState unit_load_state_from_string(const char *s);