X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=unit.h;h=72a742ca4a1f4db24b5580b9f0005d722a4da87e;hp=76aa0eff5f46676139df7a1e77fd91d9ffa2dee8;hb=a06b0b562bc11e5ca2ea88074fb3b38f2503ed6b;hpb=a16e112358ea8fea381ee106b89e645aed8b0a8c diff --git a/unit.h b/unit.h index 76aa0eff5..72a742ca4 100644 --- a/unit.h +++ b/unit.h @@ -61,6 +61,7 @@ enum UnitType { UNIT_AUTOMOUNT, UNIT_SNAPSHOT, UNIT_TIMER, + UNIT_SWAP, _UNIT_TYPE_MAX, _UNIT_TYPE_INVALID = -1 }; @@ -113,9 +114,13 @@ enum UnitDependency { UNIT_CONFLICTS, /* inverse of 'conflicts' is 'conflicts' */ /* Order */ - UNIT_BEFORE, /* inverse of before is after and vice versa */ + UNIT_BEFORE, /* inverse of 'before' is 'after' and vice versa */ UNIT_AFTER, + /* Reference information for GC logic */ + UNIT_REFERENCES, /* Inverse of 'references' is 'referenced_by' */ + UNIT_REFERENCED_BY, + _UNIT_DEPENDENCY_MAX, _UNIT_DEPENDENCY_INVALID = -1 }; @@ -144,34 +149,42 @@ struct Meta { * the job for it */ Job *job; - bool in_load_queue:1; - bool in_dbus_queue:1; - bool in_cleanup_queue:1; - bool sent_dbus_new_signal:1; - - /* If we go down, pull down everything that depends on us, too */ - bool recursive_stop; - - /* Garbage collect us we nobody wants or requires us anymore */ - bool stop_when_unneeded; - usec_t active_enter_timestamp; usec_t active_exit_timestamp; /* Counterparts in the cgroup filesystem */ CGroupBonding *cgroup_bondings; - /* Load queue */ - LIST_FIELDS(Meta, load_queue); - /* Per type list */ LIST_FIELDS(Meta, units_per_type); + /* Load queue */ + LIST_FIELDS(Meta, load_queue); + /* D-Bus queue */ LIST_FIELDS(Meta, dbus_queue); /* Cleanup queue */ LIST_FIELDS(Meta, cleanup_queue); + + /* GC queue */ + LIST_FIELDS(Meta, gc_queue); + + /* Used during GC sweeps */ + unsigned gc_marker; + + /* If we go down, pull down everything that depends on us, too */ + bool recursive_stop; + + /* Garbage collect us we nobody wants or requires us anymore */ + bool stop_when_unneeded; + + bool in_load_queue:1; + bool in_dbus_queue:1; + bool in_cleanup_queue:1; + bool in_gc_queue:1; + + bool sent_dbus_new_signal:1; }; #include "service.h" @@ -182,6 +195,7 @@ struct Meta { #include "mount.h" #include "automount.h" #include "snapshot.h" +#include "swap.h" union Unit { Meta meta; @@ -193,25 +207,12 @@ union Unit { Mount mount; Automount automount; Snapshot snapshot; + Swap swap; }; struct UnitVTable { const char *suffix; - /* Can units of this type have multiple names? */ - bool no_alias:1; - - /* If true units of this types can never have "Requires" - * dependencies, because state changes can only be observed, - * not triggered */ - bool no_requires:1; - - /* Instances make no sense for this type */ - bool no_instances:1; - - /* Exclude this type from snapshots */ - bool no_snapshots:1; - /* 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 @@ -256,6 +257,14 @@ struct UnitVTable { * unit is in. */ const char* (*sub_state_to_string)(Unit *u); + /* Return true when there is reason to keep this entry around + * even nothing references it and it isn't active in any + * way */ + bool (*check_gc)(Unit *u); + + /* Return true when this unit is suitable for snapshotting */ + bool (*check_snapshot)(Unit *u); + void (*fd_event)(Unit *u, int fd, uint32_t events, Watch *w); void (*sigchld_event)(Unit *u, pid_t pid, int code, int status); void (*timer_event)(Unit *u, uint64_t n_elapsed, Watch *w); @@ -283,6 +292,26 @@ struct UnitVTable { /* Type specific cleanups. */ void (*shutdown)(Manager *m); + + /* Can units of this type have multiple names? */ + bool no_alias:1; + + /* If true units of this types can never have "Requires" + * dependencies, because state changes can only be observed, + * not triggered */ + bool no_requires:1; + + /* Instances make no sense for this type */ + bool no_instances:1; + + /* Exclude this type from snapshots */ + bool no_snapshots:1; + + /* Exclude from automatic gc */ + bool no_gc:1; + + /* Exclude from isolation requests */ + bool no_isolate:1; }; extern const UnitVTable * const unit_vtable[_UNIT_TYPE_MAX]; @@ -309,15 +338,16 @@ DEFINE_CAST(DEVICE, Device); DEFINE_CAST(MOUNT, Mount); DEFINE_CAST(AUTOMOUNT, Automount); DEFINE_CAST(SNAPSHOT, Snapshot); +DEFINE_CAST(SWAP, Swap); Unit *unit_new(Manager *m); void unit_free(Unit *u); int unit_add_name(Unit *u, const char *name); -int unit_add_dependency(Unit *u, UnitDependency d, Unit *other); -int unit_add_dependency_by_name(Unit *u, UnitDependency d, const char *name, const char *filename); -int unit_add_dependency_by_name_inverse(Unit *u, UnitDependency d, const char *name, const char *filename); +int unit_add_dependency(Unit *u, UnitDependency d, Unit *other, bool add_reference); +int unit_add_dependency_by_name(Unit *u, UnitDependency d, const char *name, const char *filename, bool add_reference); +int unit_add_dependency_by_name_inverse(Unit *u, UnitDependency d, const char *name, const char *filename, bool add_reference); int unit_add_exec_dependencies(Unit *u, ExecContext *c); @@ -329,9 +359,12 @@ CGroupBonding* unit_get_default_cgroup(Unit *u); int unit_choose_id(Unit *u, const char *name); int unit_set_description(Unit *u, const char *description); +bool unit_check_gc(Unit *u); + void unit_add_to_load_queue(Unit *u); void unit_add_to_dbus_queue(Unit *u); void unit_add_to_cleanup_queue(Unit *u); +void unit_add_to_gc_queue(Unit *u); int unit_merge(Unit *u, Unit *other); int unit_merge_by_name(Unit *u, const char *other);