event_machine_scheduler.c

/*
 *   Copyright (c) 2015-2023, Nokia Solutions and Networks
 *   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 the copyright holder 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.
 */
 
#ifndef _GNU_SOURCE
#define _GNU_SOURCE
#endif
 
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
 
#include <stdint.h>
 
#include <odp_api.h>
 
#include <event_machine.h>
 
#include "em_atomic_group.h"
#include "em_mem.h"
#include "em_queue_types.h"
 
void
em_atomic_processing_end(void)
{
        em_locm_t *const locm = &em_locm;
 
        if (locm->current.sched_context_type != EM_SCHED_CONTEXT_TYPE_ATOMIC ||
            locm->event_burst_cnt)
                return;
 
        const queue_elem_t *q_elem = locm->current.sched_q_elem;
 
        if (unlikely(!q_elem || q_elem->type != EM_QUEUE_TYPE_ATOMIC))
                return;
 
        if (q_elem->flags.in_atomic_group)
                atomic_group_release();
        else
                odp_schedule_release_atomic();
 
        /*
         * Mark that em_atomic_processing_end() has been called
         * for the current atomic context.
         */
        locm->current.sched_context_type = EM_SCHED_CONTEXT_TYPE_NONE;
}
 
void
em_ordered_processing_end(void)
{
        em_locm_t *const locm = &em_locm;
 
        if (locm->current.sched_context_type != EM_SCHED_CONTEXT_TYPE_ORDERED ||
            locm->event_burst_cnt)
                return;
 
        const queue_elem_t *q_elem = locm->current.sched_q_elem;
 
        if (unlikely(!q_elem || q_elem->type != EM_QUEUE_TYPE_ORDERED))
                return;
 
        odp_schedule_release_ordered();
        /*
         * ODP might not actually release the ordered context here. From an EM
         * point of view the context needs to be ended since the ODP result is
         * unknown.
         */
        locm->current.sched_context_type = EM_SCHED_CONTEXT_TYPE_NONE;
}
 
void
em_preschedule(void)
{
        odp_schedule_prefetch(1);
}
 
em_sched_context_type_t
em_sched_context_type_current(em_queue_t *queue)
{
        const em_locm_t *const locm = &em_locm;
 
        if (locm->current.sched_q_elem == NULL) {
                if (queue != NULL)
                        *queue = EM_QUEUE_UNDEF;
                return EM_SCHED_CONTEXT_TYPE_NONE;
        }
 
        if (queue != NULL)
                *queue = (em_queue_t)(uintptr_t)locm->current.sched_q_elem->queue;
 
        return locm->current.sched_context_type;
}