+ * This memory barrier is paired with the one performed by
+ * the client thread after it has seen that 'lttng_sessiond_ready' is 0.
+ *
+ * The purpose of these memory barriers is to ensure that all
+ * initialization operations of the various threads that call this
+ * function to signal that they are ready are commited/published
+ * before the client thread can see the 'lttng_sessiond_ready' counter
+ * reach 0.
+ *
+ * Note that this could be a 'write' memory barrier, but a full barrier
+ * is used in case the code using this utility changes. The performance
+ * implications of this choice are minimal since this is a slow path.