sessiond: add smart pointer utils for ltt_session

[lttng-tools.git] / src / bin / lttng-sessiond / session.cpp

diff --git a/src/bin/lttng-sessiond/session.cpp b/src/bin/lttng-sessiond/session.cpp
index d8accb87de12d9cab9eba739f553b6104657d048..1846024fcc60670d505a740db81125c7ec1e0aec 100644 (file)
--- a/src/bin/lttng-sessiond/session.cpp
+++ b/src/bin/lttng-sessiond/session.cpp
@@ -6,30 +6,32 @@
  */
 
 #define _LGPL_SOURCE
-#include <limits.h>
+#include <dirent.h>
 #include <inttypes.h>
+#include <limits.h>
+#include <pthread.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <sys/stat.h>
-#include <urcu.h>
-#include <dirent.h>
 #include <sys/types.h>
-#include <pthread.h>
+#include <urcu.h>
 
 #include <common/common.hpp>
-#include <common/utils.hpp>
-#include <common/trace-chunk.hpp>
 #include <common/sessiond-comm/sessiond-comm.hpp>
-#include <lttng/location-internal.hpp>
+#include <common/trace-chunk.hpp>
+#include <common/urcu.hpp>
+#include <common/utils.hpp>
+
 #include "lttng-sessiond.hpp"
-#include "kernel.hpp"
+#include <lttng/location-internal.hpp>
 
+#include "cmd.hpp"
+#include "kernel.hpp"
 #include "session.hpp"
-#include "utils.hpp"
-#include "trace-ust.hpp"
 #include "timer.hpp"
-#include "cmd.hpp"
+#include "trace-ust.hpp"
+#include "utils.hpp"
 
 namespace {
 struct ltt_session_destroy_notifier_element {
@@ -42,6 +44,8 @@ struct ltt_session_clear_notifier_element {
        void *user_data;
 };
 
+namespace ls = lttng::sessiond;
+
 /*
  * NOTES:
  *
@@ -1461,3 +1465,38 @@ end:
        rcu_read_unlock();
        return found;
 }
+
+void ls::details::locked_session_release(ltt_session *session)
+{
+       session_unlock(session);
+       session_put(session);
+}
+
+ltt_session::locked_ptr ls::find_locked_session_by_id(ltt_session::id_t id)
+{
+       lttng::urcu::read_lock_guard rcu_lock;
+       auto session = session_find_by_id(id);
+
+       if (!session) {
+               return nullptr;
+       }
+
+       /*
+        * The pointer falling out of scope will unlock and release the reference to the
+        * session.
+        */
+       session_lock(session);
+       return ltt_session::locked_ptr(session);
+}
+
+ltt_session::sptr ls::find_session_by_id(ltt_session::id_t id)
+{
+       lttng::urcu::read_lock_guard rcu_lock;
+       auto session = session_find_by_id(id);
+
+       if (!session) {
+               return nullptr;
+       }
+
+       return {session, session_put};
+}