Basic hashtable support for UST

[lttng-tools.git] / ltt-sessiond / trace-ust.h

diff --git a/ltt-sessiond/trace-ust.h b/ltt-sessiond/trace-ust.h
index e2901a7fa346262eb72db2c96c854ea32f332b36..2b133e8c473239088eacddb637982266447a4df9 100644 (file)
--- a/ltt-sessiond/trace-ust.h
+++ b/ltt-sessiond/trace-ust.h
@@ -21,6 +21,7 @@
 
 #include <config.h>
 #include <limits.h>
+#include <urcu.h>
 #include <urcu/list.h>
 #include <lttng/lttng.h>
 
@@ -36,19 +37,8 @@
 #include "lttng-ust-abi.h"
 #endif
 
-/*
- * UST session list.
- */
-struct ltt_ust_session_list {
-       unsigned int count;
-       struct cds_list_head head;
-};
+#include "../hashtable/rculfhash.h"
 
-/* UST event list */
-struct ltt_ust_event_list {
-       unsigned int count;
-       struct cds_list_head head;
-};
 
 /* UST Stream list */
 struct ltt_ust_stream_list {
@@ -56,28 +46,25 @@ struct ltt_ust_stream_list {
        struct cds_list_head head;
 };
 
-/* UST Channel list */
-struct ltt_ust_channel_list {
-       unsigned int count;
-       struct cds_list_head head;
+/* Context hash table nodes */
+struct ltt_ust_context {
+       struct lttng_ust_context ctx;
+       struct cds_lfht_node node;
 };
 
 /* UST event */
 struct ltt_ust_event {
        int handle;
        int enabled;
-       /*
-        * TODO: need internal representation to support more than a
-        * single context.
-        */
-       struct lttng_ust_context ctx;
-       struct lttng_ust_event attr;
-       struct cds_list_head list;
        struct object_data *obj;
+       struct lttng_ust_event attr;
+       struct cds_lfht *ctx;
+       struct cds_lfht_node node;
 };
 
 /* UST stream */
 struct ltt_ust_stream {
+       /* TODO hashtable */
        struct object_data *obj;
        struct cds_list_head list;
        char *pathname;
@@ -89,28 +76,44 @@ struct ltt_ust_channel {
        int enabled;
        char name[LTTNG_UST_SYM_NAME_LEN];
        char trace_path[PATH_MAX];    /* Trace file path name */
-       /*
-        * TODO: need internal representation to support more than a
-        * single context.
-        */
-       struct lttng_ust_context ctx;
-       struct lttng_ust_channel attr;
-       struct ltt_ust_event_list events;
-       struct cds_list_head list;
        struct object_data *obj;
+
        unsigned int stream_count;
        struct ltt_ust_stream_list stream_list;
+       struct lttng_ust_channel attr;
+       struct cds_lfht *ctx;
+       struct cds_lfht *events;
+       struct cds_lfht_node node;
 };
 
 /* UST Metadata */
 struct ltt_ust_metadata {
        int handle;
        struct object_data *obj;
-       char *pathname;              /* Trace file path name */
+       char pathname[PATH_MAX];              /* Trace file path name */
        struct lttng_ust_channel attr;
        struct object_data *stream_obj;
 };
 
+/* UST domain global (LTTNG_DOMAIN_UST) */
+struct ltt_ust_domain_global {
+       struct cds_lfht *channels;
+};
+
+/* UST domain pid (LTTNG_DOMAIN_UST_PID) */
+struct ltt_ust_domain_pid {
+       pid_t pid;
+       struct cds_lfht *channels;
+       struct cds_lfht_node node;
+};
+
+/* UST domain exec name (LTTNG_DOMAIN_UST_EXEC_NAME) */
+struct ltt_ust_domain_exec {
+       char exec_name[LTTNG_UST_SYM_NAME_LEN];
+       struct cds_lfht *channels;
+       struct cds_lfht_node node;
+};
+
 /* UST session */
 struct ltt_ust_session {
        int sock;                     /* socket to send cmds to app */
@@ -119,11 +122,16 @@ struct ltt_ust_session {
        int consumer_fds_sent;
        int consumer_fd;
        char path[PATH_MAX];
-       struct lttng_domain domain;
        struct ltt_ust_metadata *metadata;
-       struct ltt_ust_channel_list channels;
-       struct cds_list_head list;
        struct object_data *obj;
+       struct ltt_ust_domain_global domain_global;
+       /*
+        * Those two hash tables contains data for a specific UST domain and a HT
+        * of channels for each. See ltt_ust_domain_exec and ltt_ust_domain_pid
+        * data structures.
+        */
+       struct cds_lfht *domain_pid;
+       struct cds_lfht *domain_exec;
 };
 
 #ifdef CONFIG_LTTNG_TOOLS_HAVE_UST
@@ -131,12 +139,10 @@ struct ltt_ust_session {
 /*
  * Lookup functions. NULL is returned if not found.
  */
-struct ltt_ust_event *trace_ust_get_event_by_name(
-               char *name, struct ltt_ust_channel *channel);
-struct ltt_ust_channel *trace_ust_get_channel_by_name(
-               char *name, struct ltt_ust_session *session);
-struct ltt_ust_session *trace_ust_get_session_by_pid(
-               struct ltt_ust_session_list *session_list, pid_t pid);
+struct ltt_ust_event *trace_ust_find_event_by_name(struct cds_lfht *ht,
+               char *name);
+struct ltt_ust_channel *trace_ust_find_channel_by_name(struct cds_lfht *ht,
+               char *name);
 
 /*
  * Create functions malloc() the data structure.
@@ -160,17 +166,19 @@ void trace_ust_destroy_event(struct ltt_ust_event *event);
 #else
 
 static inline
-struct ltt_ust_event *trace_ust_get_event_by_name(
-               char *name, struct ltt_ust_channel *channel)
+struct ltt_ust_event *trace_ust_find_event_by_name(struct cds_lfht *ht,
+               char *name)
 {
        return NULL;
 }
+
 static inline
-struct ltt_ust_channel *trace_ust_get_channel_by_name(
-               char *name, struct ltt_ust_session *session)
+struct ltt_ust_channel *trace_ust_find_channel_by_name(struct cds_lfht *ht,
+               char *name)
 {
        return NULL;
 }
+
 static inline
 struct ltt_ust_session *trace_ust_get_session_by_pid(
                struct ltt_ust_session_list *session_list, pid_t pid)