/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */

/*  Fluent Bit

 *  ==========

 *  Copyright (C) 2015-2026 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;

}