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/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* Fluent Bit
* ==========
* Copyright (C) 2015-2022 The Fluent Bit Authors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <monkey/mk_core.h>
#include <fluent-bit/flb_info.h>
#include <fluent-bit/flb_mem.h>
#include <fluent-bit/flb_utils.h>
#include <fluent-bit/flb_config.h>
#include <fluent-bit/flb_worker.h>
#include <fluent-bit/flb_log.h>
FLB_TLS_DEFINE(struct flb_worker, flb_worker_ctx);
/*
* The step_callback runs in a POSIX thread context, it have been started
* by flb_worker_create(...). Here we setup specific FLB requirements and
* then we jump into the target/original callback.
*/
static void step_callback(void *data)
{
struct flb_worker *worker = data;
/* Set the worker context global */
FLB_TLS_SET(flb_worker_ctx, worker);
/* not too scary :) */
worker->func(worker->data);
/* FIXME: add a good plan for pthread_exit and 'worker' release */
pthread_exit(NULL);
}
struct flb_worker *flb_worker_context_create(void (*func) (void *), void *arg,
struct flb_config *config)
{
struct flb_worker *worker;
worker = flb_calloc(1, sizeof(struct flb_worker));
if (!worker) {
flb_errno();
return NULL;
}
MK_EVENT_ZERO(&worker->event);
worker->func = func;
worker->data = arg;
worker->config = config;
worker->log_ctx = config->log;
return worker;
}
/*
* Creates a worker (POSIX thread). This function creates a worker
* context and also setup the 'step' callback to initialize generic
* Fluent Bit requirements before to invoke the real target callback
* set by the caller.
*
* E.g: We do this intermediary 'step' to initialize the required
* logging context and possible others.
*/
int flb_worker_create(void (*func) (void *), void *arg, pthread_t *tid,
struct flb_config *config)
{
int ret;
struct flb_worker *worker;
worker = flb_worker_context_create(func, arg, config);
if (!worker) {
return -1;
}
/* Initialize log-specific */
ret = flb_log_worker_init(worker);
if (ret == -1) {
flb_free(worker);
return -1;
}
/* Spawn the step_callback and the func() */
ret = mk_utils_worker_spawn(step_callback, worker, &worker->tid);
if (ret != 0) {
flb_free(worker);
return -1;
}
memcpy(tid, &worker->tid, sizeof(pthread_t));
mk_list_add(&worker->_head, &config->workers);
return 0;
}
/*
* The worker interface aims to prepare any context required by Threads when
* running, this function is called just one time.
*/
int flb_worker_init(struct flb_config *config)
{
FLB_TLS_INIT(flb_worker_ctx);
return 0;
}
/* Lookup a worker using it pthread id */
struct flb_worker *flb_worker_lookup(pthread_t tid, struct flb_config *config)
{
struct mk_list *head;
struct flb_worker *worker;
mk_list_foreach(head, &config->workers) {
worker = mk_list_entry(head, struct flb_worker, _head);
if (pthread_equal(worker->tid, tid) != 0) {
return worker;
}
}
return NULL;
}
struct flb_worker *flb_worker_get()
{
return FLB_TLS_GET(flb_worker_ctx);
}
void flb_worker_destroy(struct flb_worker *worker)
{
if (!worker) {
return;
}
if (worker->log_cache) {
flb_log_cache_destroy(worker->log_cache);
}
mk_list_del(&worker->_head);
flb_free(worker);
}
int flb_worker_exit(struct flb_config *config)
{
int c = 0;
struct mk_list *tmp;
struct mk_list *head;
struct flb_worker *worker;
mk_list_foreach_safe(head, tmp, &config->workers) {
worker = mk_list_entry(head, struct flb_worker, _head);
flb_worker_destroy(worker);
c++;
}
return c;
}
int flb_worker_log_level(struct flb_worker *worker)
{
struct flb_log *log = worker->log_ctx;
return log->level;
};
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