2018-11-14 08:36:25 +00:00
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/*-
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* BSD LICENSE
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*
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* Copyright (c) Intel Corporation.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name of Intel Corporation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/queue.h>
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#include "spdk/stdinc.h"
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#include "spdk/util.h"
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#include "spdk/queue.h"
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#include "spdk/string.h"
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#include "spdk/log.h"
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#include "spdk/notify.h"
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#define SPDK_NOTIFY_MAX_EVENTS 1024
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struct spdk_notify_type {
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char name[SPDK_NOTIFY_MAX_NAME_SIZE];
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TAILQ_ENTRY(spdk_notify_type) tailq;
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};
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pthread_mutex_t g_events_lock = PTHREAD_MUTEX_INITIALIZER;
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static struct spdk_notify_event g_events[SPDK_NOTIFY_MAX_EVENTS];
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static uint64_t g_events_head;
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static TAILQ_HEAD(, spdk_notify_type) g_notify_types = TAILQ_HEAD_INITIALIZER(g_notify_types);
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struct spdk_notify_type *
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spdk_notify_type_register(const char *type)
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{
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struct spdk_notify_type *it = NULL;
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if (!type) {
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SPDK_ERRLOG("Invalid notification type %p\n", type);
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return NULL;
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2019-05-05 09:58:14 +00:00
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} else if (!type[0] || strlen(type) >= SPDK_NOTIFY_MAX_NAME_SIZE) {
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SPDK_ERRLOG("Notification type '%s' too short or too long\n", type);
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2018-11-14 08:36:25 +00:00
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return NULL;
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}
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pthread_mutex_lock(&g_events_lock);
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TAILQ_FOREACH(it, &g_notify_types, tailq) {
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if (strcmp(type, it->name) == 0) {
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SPDK_ERRLOG("Notification type '%s' already registered.\n", type);
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goto out;
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}
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}
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it = calloc(1, sizeof(*it));
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if (it == NULL) {
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goto out;
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}
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snprintf(it->name, sizeof(it->name), "%s", type);
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TAILQ_INSERT_TAIL(&g_notify_types, it, tailq);
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out:
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pthread_mutex_unlock(&g_events_lock);
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return it;
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}
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const char *
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spdk_notify_type_get_name(const struct spdk_notify_type *type)
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{
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return type->name;
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}
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void
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2019-05-05 10:11:40 +00:00
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spdk_notify_foreach_type(spdk_notify_foreach_type_cb cb, void *ctx)
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2018-11-14 08:36:25 +00:00
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{
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struct spdk_notify_type *it;
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pthread_mutex_lock(&g_events_lock);
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TAILQ_FOREACH(it, &g_notify_types, tailq) {
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if (cb(it, ctx)) {
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break;
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}
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}
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pthread_mutex_unlock(&g_events_lock);
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}
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uint64_t
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spdk_notify_send(const char *type, const char *ctx)
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{
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uint64_t head;
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struct spdk_notify_event *ev;
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pthread_mutex_lock(&g_events_lock);
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head = g_events_head;
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g_events_head++;
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ev = &g_events[head % SPDK_NOTIFY_MAX_EVENTS];
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spdk_strcpy_pad(ev->type, type, sizeof(ev->type), '\0');
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spdk_strcpy_pad(ev->ctx, ctx, sizeof(ev->ctx), '\0');
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pthread_mutex_unlock(&g_events_lock);
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return head;
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}
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uint64_t
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2019-05-05 10:20:43 +00:00
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spdk_notify_foreach_event(uint64_t start_idx, uint64_t max,
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spdk_notify_foreach_event_cb cb_fn, void *ctx)
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2018-11-14 08:36:25 +00:00
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{
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uint64_t i;
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pthread_mutex_lock(&g_events_lock);
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if (g_events_head > SPDK_NOTIFY_MAX_EVENTS && start_idx < g_events_head - SPDK_NOTIFY_MAX_EVENTS) {
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start_idx = g_events_head - SPDK_NOTIFY_MAX_EVENTS;
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}
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for (i = 0; start_idx < g_events_head && i < max; start_idx++, i++) {
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if (cb_fn(start_idx, &g_events[start_idx % SPDK_NOTIFY_MAX_EVENTS], ctx)) {
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break;
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}
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}
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pthread_mutex_unlock(&g_events_lock);
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return i;
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}
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