dialog: exposed functions to search dlg and lock table entry

(cherry picked from commit 125031d)

src/modules/dialog/dlg_hash.h

@@ -300,6 +300,18 @@ int dlg_update_cseq(dlg_cell_t *dlg, unsigned int leg, str *cseq);
 int dlg_set_toroute(dlg_cell_t *dlg, str *route);
 
 
+/*!
+ * \brief Lookup a dialog in the global list
+ *
+ * Note that the caller is responsible for decrementing (or reusing)
+ * the reference counter by one again iff a dialog has been found.
+ * \param h_entry number of the hash table entry
+ * \param h_id id of the hash table entry
+ * \param lmode id if 0, then dlg table entry is unlocked, otherwise is locked
+ * \return dialog structure on success, NULL on failure
+ */
+dlg_cell_t *dlg_lookup_mode(unsigned int h_entry, unsigned int h_id, int lmode);
+
 /*!
  * \brief Lookup a dialog in the global list
  *
@@ -311,6 +323,17 @@ int dlg_set_toroute(dlg_cell_t *dlg, str *route);
  */
 dlg_cell_t* dlg_lookup(unsigned int h_entry, unsigned int h_id);
 
+/*!
+ * \brief Search a dialog in the global list by iuid
+ *
+ * Note that the caller is responsible for decrementing (or reusing)
+ * the reference counter by one again if a dialog has been found.
+ * \param diuid internal unique id per dialog
+ * \param lmode id if 0, then dlg table entry is unlocked, otherwise is locked
+ * \return dialog structure on success, NULL on failure
+ */
+dlg_cell_t* dlg_get_by_iuid_mode(dlg_iuid_t *diuid, int lmode);
+
 /*!
  * \brief Search and return dialog in the global list by iuid
  *