Implement per-context filtering

[lttng-ust.git] / liblttng-ust / lttng-context-vtid.c

diff --git a/liblttng-ust/lttng-context-vtid.c b/liblttng-ust/lttng-context-vtid.c
index 4b1da4f8e9b78541473f3e838352e04ac4461679..7d83b87c90bcf804f796e497d5ecd35162668cb0 100644 (file)
--- a/liblttng-ust/lttng-context-vtid.c
+++ b/liblttng-ust/lttng-context-vtid.c
@@ -67,6 +67,15 @@ void vtid_record(struct lttng_ctx_field *field,
                sizeof(URCU_TLS(cached_vtid)));
 }
 
+static
+void vtid_get_value(struct lttng_ctx_field *field,
+               union lttng_ctx_value *value)
+{
+       if (caa_unlikely(!URCU_TLS(cached_vtid)))
+               URCU_TLS(cached_vtid) = gettid();
+       value->s64 = URCU_TLS(cached_vtid);
+}
+
 int lttng_add_vtid_to_ctx(struct lttng_ctx **ctx)
 {
        struct lttng_ctx_field *field;
@@ -88,6 +97,7 @@ int lttng_add_vtid_to_ctx(struct lttng_ctx **ctx)
        field->event_field.type.u.basic.integer.encoding = lttng_encode_none;
        field->get_size = vtid_get_size;
        field->record = vtid_record;
+       field->get_value = vtid_get_value;
        return 0;
 }