plugin: Add a helper function to query timeseries information.

[sysdb.git] / src / include / core / object.h

diff --git a/src/include/core/object.h b/src/include/core/object.h
index 25e37d18b7c4a2817a438f4624a3bdf2b3c9e93a..19d6cc33799c68eeefa3a7e72f322fdf2522201c 100644 (file)
--- a/src/include/core/object.h
+++ b/src/include/core/object.h
@@ -57,6 +57,10 @@ struct sdb_object {
 #define SDB_OBJECT_INIT { SDB_TYPE_INIT, 1, NULL }
 #define SDB_OBJECT_TYPED_INIT(t) { (t), 1, NULL }
 
+#define SDB_OBJECT_STATIC(name) { \
+       /* type */ { sizeof(sdb_object_t), NULL, NULL }, \
+       /* ref-cnt */ 1, (name) }
+
 typedef struct {
        sdb_object_t super;
        void *data;
@@ -68,6 +72,17 @@ typedef struct {
 #define SDB_OBJ_WRAPPER(obj) ((sdb_object_wrapper_t *)(obj))
 #define SDB_CONST_OBJ_WRAPPER(obj) ((const sdb_object_wrapper_t *)(obj))
 
+/*
+ * Callback types for comparing objects or performing object lookup.
+ * Any function of type sdb_object_cmp_cb shall return a negative value, zero,
+ * or a positive value if the first object compares less than, equal to, or
+ * greater than the second object respectively.
+ * Any function of type sdb_object_lookup_cb shall return zero for all
+ * matching objects.
+ */
+typedef int (*sdb_object_cmp_cb)(const sdb_object_t *, const sdb_object_t *);
+typedef int (*sdb_object_lookup_cb)(const sdb_object_t *, const void *user_data);
+
 /*
  * sdb_object_create:
  * Allocates a new sdb_object_t of the specified 'name' and 'type'. The object
@@ -109,6 +124,13 @@ sdb_object_create_simple(const char *name, size_t size,
 #define sdb_object_create_T(n,t) \
        sdb_object_create_simple((n), sizeof(t), NULL)
 
+/*
+ * sdb_object_create_dT:
+ * Create a simple object of dynamic type 't' using destructor 'd'.
+ */
+#define sdb_object_create_dT(n,t,d) \
+       sdb_object_create_simple((n), sizeof(t), d)
+
 /*
  * sdb_object_create_wrapper:
  * Create a new sdb_object_t wrapping some arbitrary other object.
@@ -120,8 +142,8 @@ sdb_object_t *
 sdb_object_create_wrapper(const char *name,
                void *data, void (*destructor)(void *));
 
-#define SDB_OBJECT_WRAPPER_STATIC(obj, destructor) \
-       { SDB_OBJECT_INIT, (obj), (destructor) }
+#define SDB_OBJECT_WRAPPER_STATIC(obj) \
+       { SDB_OBJECT_INIT, (obj), /* destructor */ NULL }
 
 /*
  * sdb_object_deref: