1 files changed, 150 insertions, 0 deletions
diff --git a/src/spdk/lib/notify/notify.c b/src/spdk/lib/notify/notify.c
new file mode 100644
index 000000000..88c5d633b
--- /dev/null
+++ b/src/spdk/lib/notify/notify.c
@@ -0,0 +1,150 @@
+/*-
+ *   BSD LICENSE
+ *
+ *   Copyright (c) Intel Corporation.
+ *   All rights reserved.
+ *
+ *   Redistribution and use in source and binary forms, with or without
+ *   modification, are permitted provided that the following conditions
+ *   are met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above copyright
+ *       notice, this list of conditions and the following disclaimer in
+ *       the documentation and/or other materials provided with the
+ *       distribution.
+ *     * Neither the name of Intel Corporation nor the names of its
+ *       contributors may be used to endorse or promote products derived
+ *       from this software without specific prior written permission.
+ *
+ *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <sys/queue.h>
+
+#include "spdk/stdinc.h"
+#include "spdk/util.h"
+#include "spdk/queue.h"
+#include "spdk/string.h"
+#include "spdk/log.h"
+
+#include "spdk/notify.h"
+
+#define SPDK_NOTIFY_MAX_EVENTS	1024
+
+struct spdk_notify_type {
+	char name[SPDK_NOTIFY_MAX_NAME_SIZE];
+	TAILQ_ENTRY(spdk_notify_type) tailq;
+};
+
+pthread_mutex_t g_events_lock = PTHREAD_MUTEX_INITIALIZER;
+static struct spdk_notify_event g_events[SPDK_NOTIFY_MAX_EVENTS];
+static uint64_t g_events_head;
+
+static TAILQ_HEAD(, spdk_notify_type) g_notify_types = TAILQ_HEAD_INITIALIZER(g_notify_types);
+
+struct spdk_notify_type *
+spdk_notify_type_register(const char *type)
+{
+	struct spdk_notify_type *it = NULL;
+
+	if (!type) {
+		SPDK_ERRLOG("Invalid notification type %p\n", type);
+		return NULL;
+	} else if (!type[0] || strlen(type) >= SPDK_NOTIFY_MAX_NAME_SIZE) {
+		SPDK_ERRLOG("Notification type '%s' too short or too long\n", type);
+		return NULL;
+	}
+
+	pthread_mutex_lock(&g_events_lock);
+	TAILQ_FOREACH(it, &g_notify_types, tailq) {
+		if (strcmp(type, it->name) == 0) {
+			SPDK_NOTICELOG("Notification type '%s' already registered.\n", type);
+			goto out;
+		}
+	}
+
+	it = calloc(1, sizeof(*it));
+	if (it == NULL) {
+		goto out;
+	}
+
+	snprintf(it->name, sizeof(it->name), "%s", type);
+	TAILQ_INSERT_TAIL(&g_notify_types, it, tailq);
+
+out:
+	pthread_mutex_unlock(&g_events_lock);
+	return it;
+}
+
+const char *
+spdk_notify_type_get_name(const struct spdk_notify_type *type)
+{
+	return type->name;
+}
+
+
+void
+spdk_notify_foreach_type(spdk_notify_foreach_type_cb cb, void *ctx)
+{
+	struct spdk_notify_type *it;
+
+	pthread_mutex_lock(&g_events_lock);
+	TAILQ_FOREACH(it, &g_notify_types, tailq) {
+		if (cb(it, ctx)) {
+			break;
+		}
+	}
+	pthread_mutex_unlock(&g_events_lock);
+}
+
+uint64_t
+spdk_notify_send(const char *type, const char *ctx)
+{
+	uint64_t head;
+	struct spdk_notify_event *ev;
+
+	pthread_mutex_lock(&g_events_lock);
+	head = g_events_head;
+	g_events_head++;
+
+	ev = &g_events[head % SPDK_NOTIFY_MAX_EVENTS];
+	spdk_strcpy_pad(ev->type, type, sizeof(ev->type), '\0');
+	spdk_strcpy_pad(ev->ctx, ctx, sizeof(ev->ctx), '\0');
+	pthread_mutex_unlock(&g_events_lock);
+
+	return head;
+}
+
+uint64_t
+spdk_notify_foreach_event(uint64_t start_idx, uint64_t max,
+			  spdk_notify_foreach_event_cb cb_fn, void *ctx)
+{
+	uint64_t i;
+
+	pthread_mutex_lock(&g_events_lock);
+
+	if (g_events_head > SPDK_NOTIFY_MAX_EVENTS && start_idx < g_events_head - SPDK_NOTIFY_MAX_EVENTS) {
+		start_idx = g_events_head - SPDK_NOTIFY_MAX_EVENTS;
+	}
+
+	for (i = 0; start_idx < g_events_head && i < max; start_idx++, i++) {
+		if (cb_fn(start_idx, &g_events[start_idx % SPDK_NOTIFY_MAX_EVENTS], ctx)) {
+			break;
+		}
+	}
+	pthread_mutex_unlock(&g_events_lock);
+
+	return i;
+}