unit: reduce heap usage for unit objects

[elogind.git] / src / unit.h

diff --git a/src/unit.h b/src/unit.h
index 7da572350ef5dbaa5c11265acee138f9a533221e..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"
@@ -119,6 +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,
@@ -156,6 +165,9 @@ struct Meta {
 
         usec_t job_timeout;
 
+        /* References to this */
+        LIST_HEAD(UnitRef, refs);
+
         /* Conditions to check */
         LIST_HEAD(Condition, conditions);
 
@@ -237,6 +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"
@@ -265,6 +286,9 @@ 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;
@@ -414,7 +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);
@@ -512,7 +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);
 
@@ -536,6 +560,11 @@ 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);