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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 <fluent-bit/flb_info.h>
#include <fluent-bit/flb_mem.h>
#include <fluent-bit/flb_log.h>
#include <fluent-bit/flb_worker.h>
#include <fluent-bit/flb_thread_pool.h>
/* Return the next thread id. We use the list size to set an id */
static int flb_tp_thread_get_id(struct flb_tp *tp)
{
return mk_list_size(&tp->list_threads);
}
/* Create a thread manager context */
struct flb_tp *flb_tp_create(struct flb_config *config)
{
struct flb_tp *tp;
tp = flb_calloc(1, sizeof(struct flb_tp));
if (!tp) {
flb_errno();
return NULL;
}
tp->config = config;
mk_list_init(&tp->list_threads);
return tp;
}
void flb_tp_destroy(struct flb_tp *tp)
{
struct mk_list *tmp;
struct mk_list *head;
struct flb_tp_thread *th;
mk_list_foreach_safe(head, tmp, &tp->list_threads) {
th = mk_list_entry(head, struct flb_tp_thread, _head);
mk_list_del(&th->_head);
flb_free(th);
}
flb_free(tp);
}
struct flb_tp_thread *flb_tp_thread_create(struct flb_tp *tp,
void (*func)(void *), void *arg,
struct flb_config *config)
{
struct flb_tp_thread *th;
/* Create thread context */
th = flb_calloc(1, sizeof(struct flb_tp_thread));
if (!th) {
flb_errno();
return NULL;
}
th->config = config;
/*
* To spawn a thread, we use the 'worker' interface. Since the worker will
* start the thread as soon as is invoked, we keep a reference to the worker
* parameters in our context and we only use them when the thread is really
* started through the call flb_tp_thread_start().
*/
th->params.func = func;
th->params.data = arg;
/* Status */
th->status = FLB_THREAD_POOL_NONE;
/* Set the thread id */
th->id = flb_tp_thread_get_id(tp);
/* Link this thread context to the parent context list */
mk_list_add(&th->_head, &tp->list_threads);
return th;
}
/* Get a candidate thread using round-robin */
struct flb_tp_thread *flb_tp_thread_get_rr(struct flb_tp *tp)
{
struct flb_tp_thread *th;
if (!tp->thread_cur) {
th = mk_list_entry_first(&tp->list_threads,
struct flb_tp_thread, _head);
}
else {
th = mk_list_entry_next(tp->thread_cur,
struct flb_tp_thread, _head,
&tp->list_threads);
}
tp->thread_cur = &th->_head;
return th;
}
int flb_tp_thread_start(struct flb_tp *tp, struct flb_tp_thread *th)
{
int ret;
ret = flb_worker_create(th->params.func, th->params.data, &th->tid,
th->config);
if (ret == -1) {
th->status = FLB_THREAD_POOL_ERROR;
return -1;
}
/*
* Retrieve the Worker context. The worker API don't return the
* id or the context, so we use the created pthread_t (task id)
* to obtain the reference.
*/
th->worker = flb_worker_lookup(th->tid, tp->config);
th->status = FLB_THREAD_POOL_RUNNING;
return 0;
}
int flb_tp_thread_start_id(struct flb_tp *tp, int id)
{
int i = 0;
struct mk_list *head;
struct flb_tp_thread *th = NULL;
mk_list_foreach(head, &tp->list_threads) {
if (i == id) {
th = mk_list_entry(head, struct flb_tp_thread, _head);
break;
}
th = NULL;
i++;
}
if (!th) {
return -1;
}
return flb_tp_thread_start(tp, th);
}
int flb_tp_thread_start_all(struct flb_tp *tp)
{
struct mk_list *head;
struct flb_tp_thread *th;
mk_list_foreach(head, &tp->list_threads) {
th = mk_list_entry(head, struct flb_tp_thread, _head);
flb_tp_thread_start(tp, th);
}
return 0;
}
int flb_tp_thread_stop(struct flb_tp *tp, struct flb_tp_thread *th)
{
return 0;
}
int flb_tp_thread_stop_all(struct flb_tp *tp)
{
int ret;
struct mk_list *head;
struct flb_tp_thread *th;
/*
* Iterate each worker thread, signal them to stop working
* and wait a proper exit.
*/
mk_list_foreach(head, &tp->list_threads) {
th = mk_list_entry(head, struct flb_tp_thread, _head);
if (th->status != FLB_THREAD_POOL_RUNNING) {
continue;
}
ret = flb_tp_thread_stop(tp, th);
if (ret == -1) {
}
}
return 0;
}
int flb_tp_thread_destroy()
{
return 0;
}
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