intertask_interface.c 21.8 KB
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/*******************************************************************************

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 Eurecom OpenAirInterface
 Copyright(c) 1999 - 2012 Eurecom
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 This program is free software; you can redistribute it and/or modify it
 under the terms and conditions of the GNU General Public License,
 version 2, as published by the Free Software Foundation.
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 This program is distributed in the hope it will be useful, but WITHOUT
 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 more details.
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 You should have received a copy of the GNU General Public License along with
 this program; if not, write to the Free Software Foundation, Inc.,
 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
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 The full GNU General Public License is included in this distribution in
 the file called "COPYING".
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 Contact Information
 Openair Admin: openair_admin@eurecom.fr
 Openair Tech : openair_tech@eurecom.fr
 Forums       : http://forums.eurecom.fr/openairinterface
 Address      : EURECOM, Campus SophiaTech, 450 Route des Chappes
 06410 Biot FRANCE
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 *******************************************************************************/
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#define _GNU_SOURCE
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#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
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#include <signal.h>
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#include "queue.h"
#include "assertions.h"

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// #define ENABLE_EVENT_FD

#if defined(ENABLE_EVENT_FD)
# include <sys/epoll.h>
# include <sys/eventfd.h>
# include "liblfds611.h"
#endif

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#include "intertask_interface.h"
#include "intertask_interface_dump.h"
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/* Includes "intertask_interface_init.h" to check prototype coherence, but
 * disable threads and messages information generation.
 */
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#define CHECK_PROTOTYPE_ONLY
#include "intertask_interface_init.h"
#undef CHECK_PROTOTYPE_ONLY

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#include "signals.h"
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#include "timer.h"

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int itti_debug = 0;
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#define ITTI_DEBUG(x, args...) do { if (itti_debug) fprintf(stdout, "[ITTI][D]"x, ##args); } \
    while(0)
#define ITTI_ERROR(x, args...) do { fprintf(stdout, "[ITTI][E]"x, ##args); } \
    while(0)

/* Global message size */
#define MESSAGE_SIZE(mESSAGEiD) (sizeof(MessageHeader) + itti_desc.messages_info[mESSAGEiD].size)

typedef enum task_state_s {
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    TASK_STATE_NOT_CONFIGURED, TASK_STATE_STARTING, TASK_STATE_READY, TASK_STATE_ENDED, TASK_STATE_MAX,
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} task_state_t;

/* This list acts as a FIFO of messages received by tasks (RRC, NAS, ...) */
struct message_list_s {
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#if !defined(ENABLE_EVENT_FD)
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    STAILQ_ENTRY(message_list_s) next_element;
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#endif
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    MessageDef *msg; ///< Pointer to the message
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    message_number_t message_number; ///< Unique message number
    uint32_t message_priority; ///< Message priority
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};

typedef struct task_desc_s {
    /* Queue of messages belonging to the task */
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#if !defined(ENABLE_EVENT_FD)
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    STAILQ_HEAD(message_queue_head, message_list_s) message_queue;
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    /* Number of messages in the queue */
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    volatile uint32_t message_in_queue;
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    /* Mutex for the message queue */
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    pthread_mutex_t message_queue_mutex;
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    /* Conditional var for message queue and task synchro */
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    pthread_cond_t message_queue_cond_var;
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#else
    struct lfds611_queue_state *message_queue;

    /* This fd is used internally by ITTI. */
    int epoll_fd;

    /* The task fd */
    int task_event_fd;

    /* Number of events to monitor */
    uint16_t nb_events;

    /* Array of events monitored by the task.
     * By default only one fd is monitored (the one used to received messages
     * from other tasks).
     * More events can be suscribed later by the task itself.
     */
    struct epoll_event *events;
#endif
    /* pthread associated with the task */
    pthread_t task_thread;
    /* State of the task */
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    volatile task_state_t task_state;
} task_desc_t;

struct itti_desc_s {
    task_desc_t *tasks;
    /* Current message number. Incremented every call to send_msg_to_task */
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    message_number_t message_number __attribute__((aligned(8)));
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    thread_id_t thread_max;
    MessagesIds messages_id_max;

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    pthread_t thread_handling_signals;

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    const char * const *threads_name;
    const message_info_t *messages_info;
};

static struct itti_desc_s itti_desc;

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static inline message_number_t itti_increment_message_number(void) {
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    /* Atomic operation supported by GCC: returns the current message number
     * and then increment it by 1.
     * This can be done without mutex.
     */
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    return __sync_fetch_and_add (&itti_desc.message_number, 1);
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}

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static inline uint32_t itti_get_message_priority(MessagesIds message_id) {
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    DevCheck(message_id < itti_desc.messages_id_max, message_id, itti_desc.messages_id_max, 0);

    return (itti_desc.messages_info[message_id].priority);
}

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const char *itti_get_message_name(MessagesIds message_id) {
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    DevCheck(message_id < itti_desc.messages_id_max, message_id, itti_desc.messages_id_max, 0);

    return (itti_desc.messages_info[message_id].name);
}

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const char *itti_get_task_name(task_id_t task_id)
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{
    thread_id_t thread_id = TASK_GET_THREAD_ID(task_id);

    DevCheck(thread_id < itti_desc.thread_max, thread_id, itti_desc.thread_max, 0);

    return (itti_desc.threads_name[thread_id]);
}

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int itti_send_broadcast_message(MessageDef *message_p) {
    thread_id_t origin_thread_id;
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    uint32_t i;
    int ret = 0;
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    int result;
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    DevAssert(message_p != NULL);
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    origin_thread_id = TASK_GET_THREAD_ID(message_p->header.originTaskId);
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    for (i = THREAD_FIRST; i < itti_desc.thread_max; i++) {
        MessageDef *new_message_p;

        /* Skip task that broadcast the message */
        if (i != origin_thread_id) {
            /* Skip tasks which are not running */
            if (itti_desc.tasks[i].task_state == TASK_STATE_READY) {
                new_message_p = malloc (sizeof(MessageDef));
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                DevAssert(message_p != NULL);
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                memcpy (new_message_p, message_p, sizeof(MessageDef));
                result = itti_send_msg_to_task (TASK_SHIFT_THREAD_ID(i), INSTANCE_DEFAULT, new_message_p);
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                DevCheck(result >= 0, message_p->header.messageId, i, 0);
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            }
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        }
    }
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    free (message_p);
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    return ret;
}

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inline MessageDef *itti_alloc_new_message(task_id_t origin_task_id, MessagesIds message_id) {
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    MessageDef *temp = NULL;

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    DevCheck(message_id < itti_desc.messages_id_max, message_id, itti_desc.messages_id_max, 0);
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    temp = calloc (1, MESSAGE_SIZE(message_id));
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    DevAssert(temp != NULL);
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    temp->header.messageId = message_id;
    temp->header.originTaskId = origin_task_id;
    temp->header.size = itti_desc.messages_info[message_id].size;

    return temp;
}

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int itti_send_msg_to_task(task_id_t task_id, instance_t instance, MessageDef *message) {
    thread_id_t thread_id = TASK_GET_THREAD_ID(task_id);
    struct message_list_s *new;
    uint32_t priority;
    message_number_t message_number;
    uint32_t message_id;
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    DevAssert(message != NULL);
    DevCheck(thread_id < itti_desc.thread_max, thread_id, itti_desc.thread_max, 0);
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    message->header.destinationTaskId = task_id;
    message->header.instance = instance;
    message_id = message->header.messageId;
    DevCheck(message_id < itti_desc.messages_id_max, itti_desc.messages_id_max, message_id, 0);

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    priority = itti_get_message_priority (message_id);
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    /* We cannot send a message if the task is not running */
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    DevCheck(itti_desc.tasks[thread_id].task_state == TASK_STATE_READY, itti_desc.tasks[thread_id].task_state,
             TASK_STATE_READY, thread_id);
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#if !defined(ENABLE_EVENT_FD)
    /* Lock the mutex to get exclusive access to the list */
    pthread_mutex_lock (&itti_desc.tasks[thread_id].message_queue_mutex);

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    /* Check the number of messages in the queue */
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    DevCheck((itti_desc.tasks[thread_id].message_in_queue * sizeof(MessageDef)) < ITTI_QUEUE_SIZE_PER_TASK,
             (itti_desc.tasks[thread_id].message_in_queue * sizeof(MessageDef)), ITTI_QUEUE_SIZE_PER_TASK,
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              itti_desc.tasks[thread_id].message_in_queue);
#endif
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    /* Allocate new list element */
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    new = (struct message_list_s *) malloc (sizeof(struct message_list_s));
    DevAssert(new != NULL);
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    /* Increment the global message number */
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    message_number = itti_increment_message_number ();
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    /* Fill in members */
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    new->msg = message;
    new->message_number = message_number;
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    new->message_priority = priority;

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    itti_dump_queue_message (message_number, message, itti_desc.messages_info[message_id].name,
                             MESSAGE_SIZE(message_id));
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#if defined(ENABLE_EVENT_FD)
    {
        uint64_t message_ptr = 0;

        /* Call to write for an event fd must be of 8 bytes */
        write(itti_desc.tasks[thread_id].task_event_fd, &message_ptr, sizeof(message_ptr));

        lfds611_queue_enqueue(itti_desc.tasks[thread_id].message_queue, new);
    }
#else
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    if (STAILQ_EMPTY (&itti_desc.tasks[thread_id].message_queue)) {
        STAILQ_INSERT_HEAD (&itti_desc.tasks[thread_id].message_queue, new, next_element);
    }
    else {
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//         struct message_list_s *insert_after = NULL;
//         struct message_list_s *temp;
// 
//         /* This method is inefficient... */
//         STAILQ_FOREACH(temp, &itti_desc.tasks[thread_id].message_queue, next_element) {
//             struct message_list_s *next;
//             next = STAILQ_NEXT(temp, next_element);
//             /* Increment message priority to create a sort of
//              * priority based scheduler */
// //             if (temp->message_priority < TASK_PRIORITY_MAX) {
// //                 temp->message_priority++;
// //             }
//             if (next && next->message_priority < priority) {
//                 insert_after = temp;
//                 break;
//             }
//         }
//         if (insert_after == NULL) {
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        STAILQ_INSERT_TAIL (&itti_desc.tasks[thread_id].message_queue, new, next_element);
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//         } else {
//             STAILQ_INSERT_AFTER(&itti_desc.tasks[thread_id].message_queue, insert_after, new,
//                                 next_element);
//         }
    }

    /* Update the number of messages in the queue */
    itti_desc.tasks[thread_id].message_in_queue++;
    if (itti_desc.tasks[thread_id].message_in_queue == 1) {
        /* Emit a signal to wake up target task thread */
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        pthread_cond_signal (&itti_desc.tasks[thread_id].message_queue_cond_var);
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    }
    /* Release the mutex */
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    pthread_mutex_unlock (&itti_desc.tasks[thread_id].message_queue_mutex);
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#endif

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    ITTI_DEBUG(
            "Message %s, number %lu with priority %d successfully sent to queue (%u:%s)\n",
            itti_desc.messages_info[message_id].name, message_number, priority, thread_id, itti_desc.threads_name[thread_id]);
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    return 0;
}

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#if defined(ENABLE_EVENT_FD)
static inline void itti_receive_msg_internal_event_fd(task_id_t task_id, uint8_t polling, MessageDef **received_msg)
{
    int epoll_ret = 0;
    int epoll_timeout = 0;

    thread_id_t thread_id = TASK_GET_THREAD_ID(task_id);

    DevCheck(thread_id < itti_desc.thread_max, thread_id, itti_desc.thread_max, 0);
    DevAssert(received_msg != NULL);

    *received_msg = NULL;

    if (polling) {
        /* In polling mode we set the timeout to 0 causing epoll_wait to return
         * immediately.
         */
        epoll_timeout = 0;
    } else {
        /* timeout = -1 causes the epoll_wait to wait indefinetely.
         */
        epoll_timeout = -1;
    }

    epoll_ret = epoll_wait(itti_desc.tasks[thread_id].epoll_fd,
                           itti_desc.tasks[thread_id].events,
                           itti_desc.tasks[thread_id].nb_events,
                           epoll_timeout);

    if (epoll_ret < 0) {
        ITTI_ERROR("epoll_wait failed for task %s: %s\n",
        itti_get_task_name(task_id), strerror(errno));
        DevAssert(0 == 1);
    }
    if (epoll_ret == 0 && polling) {
        /* No data to read -> return */
        return;
    }

    {
        struct message_list_s *message;
        uint64_t sem_counter;

        /* Read will always return 1 */
        read(itti_desc.tasks[thread_id].task_event_fd, &sem_counter, sizeof(sem_counter));

        if (lfds611_queue_dequeue(itti_desc.tasks[thread_id].message_queue,
            (void **)&message) == 0)
        {
            /* No element in list -> this should not happen */
            DevMessage("No element in message queue...");
        }
        *received_msg = message->msg;
        free(message);
    }
}
#endif

void itti_receive_msg(task_id_t task_id, MessageDef **received_msg)
{
#if defined(ENABLE_EVENT_FD)
    itti_receive_msg_internal_event_fd(task_id, 0, received_msg);
#else
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    thread_id_t thread_id = TASK_GET_THREAD_ID(task_id);

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    DevCheck(thread_id < itti_desc.thread_max, thread_id, itti_desc.thread_max, 0);
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    DevAssert(received_msg != NULL);

    // Lock the mutex to get exclusive access to the list
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    pthread_mutex_lock (&itti_desc.tasks[thread_id].message_queue_mutex);
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    if (itti_desc.tasks[thread_id].message_in_queue == 0) {
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        ITTI_DEBUG("Message in queue[(%u:%s)] == 0, waiting\n", thread_id, itti_desc.threads_name[thread_id]);
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        // Wait while list == 0
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        pthread_cond_wait (&itti_desc.tasks[thread_id].message_queue_cond_var,
                           &itti_desc.tasks[thread_id].message_queue_mutex);
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        ITTI_DEBUG("Receiver queue[(%u:%s)] got new message notification for task %x\n",
                   thread_id, itti_desc.threads_name[thread_id], task_id);
    }

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    if (!STAILQ_EMPTY (&itti_desc.tasks[thread_id].message_queue)) {
        struct message_list_s *temp = STAILQ_FIRST (&itti_desc.tasks[thread_id].message_queue);
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        /* Update received_msg reference */
        *received_msg = temp->msg;

        /* Remove message from queue */
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        STAILQ_REMOVE_HEAD (&itti_desc.tasks[thread_id].message_queue, next_element);
        free (temp);
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        itti_desc.tasks[thread_id].message_in_queue--;
    }
    // Release the mutex
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    pthread_mutex_unlock (&itti_desc.tasks[thread_id].message_queue_mutex);
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#endif
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}

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void itti_poll_msg(task_id_t task_id, instance_t instance, MessageDef **received_msg) {
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    thread_id_t thread_id = TASK_GET_THREAD_ID(task_id);

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    DevCheck(thread_id < itti_desc.thread_max, thread_id, itti_desc.thread_max, 0);
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    DevAssert(received_msg != NULL);
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    *received_msg = NULL;

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#if defined(ENABLE_EVENT_FD)
    itti_receive_msg_internal_event_fd(task_id, 1, received_msg);
#else
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    if (itti_desc.tasks[thread_id].message_in_queue != 0) {
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        struct message_list_s *temp;

        // Lock the mutex to get exclusive access to the list
        pthread_mutex_lock (&itti_desc.tasks[thread_id].message_queue_mutex);

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        STAILQ_FOREACH (temp, &itti_desc.tasks[thread_id].message_queue, next_element)
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        {
            if ((temp->msg->header.destinationTaskId == task_id)
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                    && ((instance == INSTANCE_ALL) || (temp->msg->header.instance == instance))) {
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                /* Update received_msg reference */
                *received_msg = temp->msg;

                /* Remove message from queue */
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                STAILQ_REMOVE (&itti_desc.tasks[thread_id].message_queue, temp, message_list_s, next_element);
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                free (temp);
                itti_desc.tasks[thread_id].message_in_queue--;

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                ITTI_DEBUG(
                        "Receiver queue[(%u:%s)] got new message %s, number %lu for task %x\n",
                        thread_id, itti_desc.threads_name[thread_id], itti_desc.messages_info[temp->msg->header.messageId].name, temp->message_number, task_id);
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                break;
            }
        }

        // Release the mutex
        pthread_mutex_unlock (&itti_desc.tasks[thread_id].message_queue_mutex);
    }
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#endif
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    if (*received_msg == NULL) {
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        ITTI_DEBUG("No message in queue[(%u:%s)] for task %x\n", thread_id, itti_desc.threads_name[thread_id], task_id);
    }
}

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int itti_create_task(task_id_t task_id, void *(*start_routine)(void *), void *args_p) {
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    thread_id_t thread_id = TASK_GET_THREAD_ID(task_id);
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    int result;
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    DevAssert(start_routine != NULL);
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    DevCheck(thread_id < itti_desc.thread_max, thread_id, itti_desc.thread_max, 0);
    DevCheck(itti_desc.tasks[thread_id].task_state == TASK_STATE_NOT_CONFIGURED, task_id, thread_id,
             itti_desc.tasks[thread_id].task_state);
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    itti_desc.tasks[thread_id].task_state = TASK_STATE_STARTING;

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    result = pthread_create (&itti_desc.tasks[thread_id].task_thread, NULL, start_routine, args_p);
    DevCheck(result>= 0, task_id, thread_id, result);
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    /* Wait till the thread is completely ready */
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    while (itti_desc.tasks[thread_id].task_state != TASK_STATE_READY)
        ;
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    return 0;
}

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void itti_mark_task_ready(task_id_t task_id) {
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    thread_id_t thread_id = TASK_GET_THREAD_ID(task_id);

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    DevCheck(thread_id < itti_desc.thread_max, thread_id, itti_desc.thread_max, 0);

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#if !defined(ENABLE_EVENT_FD)
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    // Lock the mutex to get exclusive access to the list
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    pthread_mutex_lock (&itti_desc.tasks[thread_id].message_queue_mutex);
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#endif

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    itti_desc.tasks[thread_id].task_state = TASK_STATE_READY;
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#if !defined(ENABLE_EVENT_FD)
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    // Release the mutex
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    pthread_mutex_unlock (&itti_desc.tasks[thread_id].message_queue_mutex);
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#endif
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}

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void itti_exit_task(void) {
    pthread_exit (NULL);
}

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void itti_terminate_tasks(task_id_t task_id) {
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    // Sends Terminate signals to all tasks.
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    itti_send_terminate_message (task_id);

    if (itti_desc.thread_handling_signals >= 0) {
        pthread_kill (itti_desc.thread_handling_signals, SIGUSR1);
    }

    pthread_exit (NULL);
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}

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int itti_init(thread_id_t thread_max, MessagesIds messages_id_max, const char * const *threads_name,
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              const message_info_t *messages_info, const char * const messages_definition_xml, const char * const dump_file_name) {
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    int i;
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    itti_desc.message_number = 1;
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    ITTI_DEBUG("Init: %d threads, %d messages\n", thread_max, messages_id_max);
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    CHECK_INIT_RETURN(signal_init());

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    /* Saves threads and messages max values */
    itti_desc.thread_max = thread_max;
    itti_desc.messages_id_max = messages_id_max;
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    itti_desc.thread_handling_signals = -1;
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    itti_desc.threads_name = threads_name;
    itti_desc.messages_info = messages_info;

    /* Allocates memory for tasks info */
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    itti_desc.tasks = calloc (itti_desc.thread_max, sizeof(task_desc_t));
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    /* Initializing each queue and related stuff */
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    for (i = THREAD_FIRST; i < itti_desc.thread_max; i++)
    {
#if defined(ENABLE_EVENT_FD)
        ITTI_DEBUG("Creating queue of message of size %u\n",
           ITTI_QUEUE_SIZE_PER_TASK / (sizeof(MessageDef) + sizeof(struct message_list_s)));
        if (lfds611_queue_new(&itti_desc.tasks[i].message_queue,
            ITTI_QUEUE_SIZE_PER_TASK / (sizeof(MessageDef) + sizeof(struct message_list_s))) < 0)
        {
            ITTI_ERROR("lfds611_queue_new failed for task %u\n", i);
            DevAssert(0 == 1);
        }

        itti_desc.tasks[i].epoll_fd = epoll_create1(0);
        if (itti_desc.tasks[i].epoll_fd == -1) {
            ITTI_ERROR("Failed to create new epoll fd: %s\n", strerror(errno));
            /* Always assert on this condition */
            DevAssert(0 == 1);
        }

        itti_desc.tasks[i].task_event_fd = eventfd(0, EFD_SEMAPHORE);
        if (itti_desc.tasks[i].task_event_fd == -1) {
            ITTI_ERROR("eventfd failed: %s\n", strerror(errno));
            /* Always assert on this condition */
            DevAssert(0 == 1);
        }

        itti_desc.tasks[i].nb_events = 1;

        itti_desc.tasks[i].events = malloc(sizeof(struct epoll_event));

        itti_desc.tasks[i].events->events  = EPOLLIN;
        itti_desc.tasks[i].events->data.fd = itti_desc.tasks[i].task_event_fd;

        /* Add the event fd to the list of monitored events */
        if (epoll_ctl(itti_desc.tasks[i].epoll_fd, EPOLL_CTL_ADD,
            itti_desc.tasks[i].task_event_fd, itti_desc.tasks[i].events) != 0)
        {
            ITTI_ERROR("epoll_ctl failed: %s\n", strerror(errno));
            /* Always assert on this condition */
            DevAssert(0 == 1);
        }
#else
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        STAILQ_INIT (&itti_desc.tasks[i].message_queue);
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        itti_desc.tasks[i].message_in_queue = 0;
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        // Initialize mutexes
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        pthread_mutex_init (&itti_desc.tasks[i].message_queue_mutex, NULL);
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        // Initialize Cond vars
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        pthread_cond_init (&itti_desc.tasks[i].message_queue_cond_var, NULL);
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#endif

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        itti_desc.tasks[i].task_state = TASK_STATE_NOT_CONFIGURED;
    }
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    itti_dump_init (messages_definition_xml, dump_file_name);
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    CHECK_INIT_RETURN(timer_init ());
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    return 0;
}

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void itti_wait_tasks_end(void) {
    int end = 0;
    int i;
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    int ready_tasks;
    int result;
    int retries = 10;
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    itti_desc.thread_handling_signals = pthread_self ();

    /* Handle signals here */
    while (end == 0) {
        signal_handle (&end);
    }

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    do {
        ready_tasks = 0;

        for (i = THREAD_FIRST; i < itti_desc.thread_max; i++) {
            /* Skip tasks which are not running */
            if (itti_desc.tasks[i].task_state == TASK_STATE_READY) {
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                result = pthread_tryjoin_np (itti_desc.tasks[i].task_thread, NULL);

                ITTI_DEBUG("Thread %s join status %d\n", itti_desc.threads_name[i], result);

                if (result == 0) {
                    /* Thread has terminated */
                    itti_desc.tasks[i].task_state = TASK_STATE_ENDED;
                }
                else {
                    /* Thread is still running, count it */
                    ready_tasks++;
                }
            }
        }
        if (ready_tasks > 0) {
            usleep (100 * 1000);
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        }
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    } while ((ready_tasks > 0) && (retries--));

    if (ready_tasks > 0) {
        ITTI_DEBUG("Some threads are still running, force exit\n");
        exit (0);
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    }
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    itti_dump_exit();
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}

void itti_send_terminate_message(task_id_t task_id) {
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    MessageDef *terminate_message_p;

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    terminate_message_p = itti_alloc_new_message (task_id, TERMINATE_MESSAGE);
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    itti_send_broadcast_message (terminate_message_p);
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}