+ utype = -1;
+ break;
+ }
+ return utype;
+}
+
+/*
+ * Return 1 if contexts match, 0 otherwise.
+ */
+int trace_ust_match_context(struct ltt_ust_context *uctx,
+ struct lttng_event_context *ctx)
+{
+ int utype;
+
+ utype = trace_ust_context_type_event_to_ust(ctx->ctx);
+ if (utype < 0) {
+ return 0;
+ }
+ if (uctx->ctx.ctx != utype) {
+ return 0;
+ }
+ switch (utype) {
+ case LTTNG_UST_CONTEXT_PERF_THREAD_COUNTER:
+ if (uctx->ctx.u.perf_counter.type
+ != ctx->u.perf_counter.type) {
+ return 0;
+ }
+ if (uctx->ctx.u.perf_counter.config
+ != ctx->u.perf_counter.config) {
+ return 0;
+ }
+ if (strncmp(uctx->ctx.u.perf_counter.name,
+ ctx->u.perf_counter.name,
+ LTTNG_UST_SYM_NAME_LEN)) {
+ return 0;
+ }
+ break;
+ default:
+ break;
+
+ }
+ return 1;
+}
+
+/*
+ * Allocate and initialize an UST context.
+ *
+ * Return pointer to structure or NULL.
+ */
+struct ltt_ust_context *trace_ust_create_context(
+ struct lttng_event_context *ctx)
+{
+ struct ltt_ust_context *uctx;
+ int utype;
+
+ assert(ctx);
+
+ utype = trace_ust_context_type_event_to_ust(ctx->ctx);
+ if (utype < 0) {