+ g_mutex_unlock(barrier->lock);
+ bluesky_store_async_unref(barrier);
+}
+
+/* Mark an asynchronous operation as complete. This should only be called by
+ * the store implementations. The lock should be held when calling this
+ * function. Any notifier functions will be called, but in a separate thread
+ * and without the lock held. */
+void bluesky_store_async_mark_complete(BlueSkyStoreAsync *async)
+{
+ g_return_if_fail(async->status != ASYNC_COMPLETE);
+
+ bluesky_time_hires elapsed = bluesky_now_hires() - async->start_time;
+ bluesky_time_hires latency = bluesky_now_hires() - async->exec_time;
+
+ if (async->op != STORE_OP_BARRIER) {
+ g_mutex_lock(async->store->lock);
+ async->store->pending--;
+ if (async->store->pending == 0)
+ g_cond_broadcast(async->store->cond_idle);
+ g_mutex_unlock(async->store->lock);
+ }
+
+ /* If the request was a range request but the backend read the entire
+ * object, select out the appropriate bytes. */
+ if (async->op == STORE_OP_GET
+ && !async->range_done
+ && async->result == 0
+ && async->data != NULL) {
+ if (async->start != 0 || async->len != 0) {
+ /* If the caller requesteda read outside the object, return an
+ * error. */
+ if (async->start + async->len > async->data->len) {
+ g_warning("Range request outside object boundaries!\n");
+ async->result = -1;
+ } else {
+ if (async->len == 0)
+ async->len = async->data->len - async->start;
+ BlueSkyRCStr *newstr = bluesky_string_new(g_memdup(&async->data->data[async->start], async->len), async->len);
+ bluesky_string_unref(async->data);
+ async->data = newstr;
+ async->range_done = TRUE;
+ }
+ }
+ }
+
+ async->status = ASYNC_COMPLETE;
+ g_cond_broadcast(async->completion_cond);
+
+ if (async->barrier != NULL && async->notifiers == NULL)
+ op_complete(async, async->barrier);
+
+ while (async->notifiers != NULL) {
+ struct BlueSkyNotifierList *nl = async->notifiers;
+ async->notifiers = nl->next;
+ g_thread_pool_push(notifier_thread_pool, nl, NULL);
+ }
+
+ if (async->profile) {
+ bluesky_profile_add_event(
+ async->profile,
+ g_strdup_printf("%s for %s complete",
+ async->op == STORE_OP_GET ? "GET"
+ : async->op == STORE_OP_PUT ? "PUT"
+ : async->op == STORE_OP_DELETE ? "DELETE"
+ : async->op == STORE_OP_BARRIER ? "BARRIER" : "???",
+ async->key)
+ );
+ }
+
+ if (bluesky_verbose) {
+ g_log("bluesky/store", G_LOG_LEVEL_DEBUG,
+ "[%p] complete: elapsed = %"PRIi64" ns, latency = %"PRIi64" ns",
+ async, elapsed, latency);
+ }
+
+ if (async->data) {
+ if (async->op == STORE_OP_GET) {
+ bluesky_stats_add(async->store->stats_get, async->data->len);
+ } else if (async->op == STORE_OP_PUT) {
+ bluesky_stats_add(async->store->stats_put, async->data->len);
+ }
+ }
+}
+
+void bluesky_store_async_submit(BlueSkyStoreAsync *async)
+{
+ BlueSkyStore *store = async->store;
+
+ async->start_time = bluesky_now_hires();
+
+ // Backends should fill this in with a better estimate of the actual time
+ // processing was started, if there could be a delay from submission time.
+ async->exec_time = bluesky_now_hires();
+
+ if (async->profile) {
+ bluesky_profile_add_event(
+ async->profile,
+ g_strdup_printf("Start %s for %s",
+ async->op == STORE_OP_GET ? "GET"
+ : async->op == STORE_OP_PUT ? "PUT"
+ : async->op == STORE_OP_DELETE ? "DELETE"
+ : async->op == STORE_OP_BARRIER ? "BARRIER" : "???",
+ async->key)
+ );
+ }
+
+ if (bluesky_verbose) {
+ g_log("bluesky/store", G_LOG_LEVEL_DEBUG, "[%p] submit: %s %s",
+ async,
+ async->op == STORE_OP_GET ? "GET"
+ : async->op == STORE_OP_PUT ? "PUT"
+ : async->op == STORE_OP_DELETE ? "DELETE"
+ : async->op == STORE_OP_BARRIER ? "BARRIER" : "???",
+ async->key);
+ }
+
+ /* Barriers are handled specially, and not handed down the storage
+ * implementation layer. */
+ if (async->op == STORE_OP_BARRIER) {
+ async->status = ASYNC_RUNNING;
+ if (GPOINTER_TO_INT(async->store_private) == 0)
+ bluesky_store_async_mark_complete(async);
+ return;
+ }
+
+ g_mutex_lock(async->store->lock);
+ async->store->pending++;
+ g_mutex_unlock(async->store->lock);
+
+ store->impl->submit(store->handle, async);
+
+ if (bluesky_options.synchronous_stores)
+ bluesky_store_async_wait(async);
+}
+
+/* Add the given operation to the barrier. The barrier will not complete until
+ * all operations added to it have completed. */
+void bluesky_store_add_barrier(BlueSkyStoreAsync *barrier,
+ BlueSkyStoreAsync *async)
+{
+ g_return_if_fail(barrier->op == STORE_OP_BARRIER);
+
+ g_mutex_lock(barrier->lock);
+ barrier->store_private
+ = GINT_TO_POINTER(GPOINTER_TO_INT(barrier->store_private) + 1);
+ g_mutex_unlock(barrier->lock);
+
+ g_mutex_lock(async->lock);
+ if (async->barrier == NULL && async->status != ASYNC_COMPLETE) {
+ async->barrier = barrier;
+ g_mutex_unlock(async->lock);
+ } else {
+ if (async->barrier != NULL)
+ g_warning("Adding async to more than one barrier!\n");
+ g_mutex_unlock(async->lock);
+ bluesky_store_async_add_notifier(async, op_complete, barrier);
+ }
+}
+
+static void notifier_task(gpointer n, gpointer s)
+{
+ struct BlueSkyNotifierList *notifier = (struct BlueSkyNotifierList *)n;
+
+ notifier->func(notifier->async, notifier->user_data);
+ if (g_atomic_int_dec_and_test(¬ifier->async->notifier_count)) {
+ g_mutex_lock(notifier->async->lock);
+ if (notifier->async->barrier != NULL)
+ op_complete(notifier->async, notifier->async->barrier);
+ g_cond_broadcast(notifier->async->completion_cond);
+ g_mutex_unlock(notifier->async->lock);
+ }
+ bluesky_store_async_unref(notifier->async);
+ g_free(notifier);
+}
+
+void bluesky_store_sync(BlueSkyStore *store)
+{
+ g_mutex_lock(store->lock);
+ if (bluesky_verbose) {
+ g_log("bluesky/store", G_LOG_LEVEL_DEBUG,
+ "Waiting for pending store operations to complete...");
+ }
+ while (store->pending > 0) {
+ g_cond_wait(store->cond_idle, store->lock);
+ }
+ g_mutex_unlock(store->lock);
+ if (bluesky_verbose) {
+ g_log("bluesky/store", G_LOG_LEVEL_DEBUG, "Operations are complete.");
+ }
+}
+
+/* Convenience wrappers that perform a single operation synchronously. */
+BlueSkyRCStr *bluesky_store_get(BlueSkyStore *store, const gchar *key)
+{
+ BlueSkyStoreAsync *async = bluesky_store_async_new(store);
+ async->op = STORE_OP_GET;
+ async->key = g_strdup(key);
+ bluesky_store_async_submit(async);
+
+ bluesky_store_async_wait(async);
+
+ BlueSkyRCStr *data = async->data;
+ bluesky_string_ref(data);
+ bluesky_store_async_unref(async);
+ return data;
+}
+
+void bluesky_store_put(BlueSkyStore *store,
+ const gchar *key, BlueSkyRCStr *val)
+{
+ BlueSkyStoreAsync *async = bluesky_store_async_new(store);
+ async->op = STORE_OP_PUT;
+ async->key = g_strdup(key);
+ bluesky_string_ref(val);
+ async->data = val;
+ bluesky_store_async_submit(async);
+
+ bluesky_store_async_wait(async);
+ bluesky_store_async_unref(async);