int lttng_ust_context_set_provider_rcu(struct lttng_ust_ctx **_ctx,
const char *name,
size_t (*get_size)(void *priv, size_t offset),
int lttng_ust_context_set_provider_rcu(struct lttng_ust_ctx **_ctx,
const char *name,
size_t (*get_size)(void *priv, size_t offset),