numam-spdk/lib/notify/notify.c

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/*-
* 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_ERRLOG("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;
}