713 lines
30 KiB
C
713 lines
30 KiB
C
/*
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* Licensed to the OpenAirInterface (OAI) Software Alliance under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The OpenAirInterface Software Alliance licenses this file to You under
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* the OAI Public License, Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.openairinterface.org/?page_id=698
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*-------------------------------------------------------------------------------
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* For more information about the OpenAirInterface (OAI) Software Alliance:
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* contact@openairinterface.org
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*/
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/*****************************************************************************
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Source nas_timer.c
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Version 0.1
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Date 2012/10/09
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Product NAS stack
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Subsystem Utilities
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Author Frederic Maurel
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Description Timer utilities
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*****************************************************************************/
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#include <pthread.h>
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#include <assert.h>
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#include <stdint.h>
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#include <string.h> // memset
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#include <stdlib.h> // malloc, free
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#include <sys/time.h> // setitimer
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#include "intertask_interface.h"
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#include "nas_timer.h"
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#include "commonDef.h"
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/****************************************************************************/
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/**************** E X T E R N A L D E F I N I T I O N S ****************/
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/****************************************************************************/
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/****************************************************************************/
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/******************* L O C A L D E F I N I T I O N S *******************/
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/****************************************************************************/
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/* Structure of an interval timer entry
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* ------------------------------------
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* The callback function is scheduled to be executed upon expiration of
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* the timer that has been previously setup to the initial interval time
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* value when the timer entry was allocated.
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*/
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typedef struct {
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long timer_id; /* Timer id returned by the timer API from ITTI */
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struct timeval itv; /* Initial interval timer value */
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struct timeval tv; /* Interval timer value */
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nas_timer_callback_t cb; /* Callback executed at timer expiration */
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void *args; /* Callback argument parameters */
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} nas_timer_entry_t;
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/* Structure of a timer queue - list of active interval timer entries
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* ------------------------------------------------------------------
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* At any time, the first entry of the queue is always associated to the
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* first timer that will come to expire. Upon timer expiration, the first
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* entry is removed from the queue and freed.
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*/
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typedef struct _nas_timer_queue_t {
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int id; /* Identifier of the current timer entry */
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nas_timer_entry_t *entry; /* The current timer entry */
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struct _nas_timer_queue_t *prev;/* The previous timer entry in the queue */
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struct _nas_timer_queue_t *next;/* The next timer entry in the queue */
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} timer_queue_t;
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/* Structure of a timer database
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* -----------------------------
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* The timer database is managed to provide unique identifier to timer at
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* startup and to maintain an ordered queue of active timer entries.
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*/
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typedef struct {
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int timer_id; /* Identifier of the first available timer entry */
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#define TIMER_DATABASE_SIZE 256
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timer_queue_t tq[TIMER_DATABASE_SIZE];
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timer_queue_t *head;/* Pointer to the first timer entry to be fired */
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} nas_timer_database_t;
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/*
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* The timer database
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*/
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static nas_timer_database_t _nas_timer_db = {
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0,
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{},
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NULL
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};
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#define nas_timer_lock_db()
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#define nas_timer_unlock_db()
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/*
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* The handler executed whenever the system timer expires
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*/
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/*
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* -----------------------------------------------------------------------------
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* Functions used to manage the timer database
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* -----------------------------------------------------------------------------
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*/
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static void _nas_timer_db_init(void);
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static int _nas_timer_db_get_id(void);
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static bool _nas_timer_db_is_active(int id);
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static nas_timer_entry_t *_nas_timer_db_create_entry(long sec,
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nas_timer_callback_t cb, void *args);
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static void _nas_timer_db_delete_entry(int id);
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static void _nas_timer_db_insert_entry(int id, nas_timer_entry_t *te);
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static int _nas_timer_db_insert(timer_queue_t *entry);
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static nas_timer_entry_t *_nas_timer_db_remove_entry(int id);
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static bool _nas_timer_db_remove(timer_queue_t *entry);
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/*
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* -----------------------------------------------------------------------------
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* Operator functions for timeval structures
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* -----------------------------------------------------------------------------
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*/
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static int _nas_timer_cmp(const struct timeval *a, const struct timeval *b);
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static void _nas_timer_add(const struct timeval *a, const struct timeval *b,
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struct timeval *result);
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static int _nas_timer_sub(const struct timeval *a, const struct timeval *b,
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struct timeval *result);
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/****************************************************************************/
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/****************** E X P O R T E D F U N C T I O N S ******************/
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/****************************************************************************/
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/****************************************************************************
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** **
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** Name: timer_init() **
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** **
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** Description: Initializes internal data used to manage timers **
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** **
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** Inputs: None **
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** Others: None **
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** **
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** Outputs: None **
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** Return: RETURNok, RETURNerror **
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** Others: _nas_timer_db **
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** **
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***************************************************************************/
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int nas_timer_init(void)
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{
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/* Initialize the timer database */
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_nas_timer_db_init();
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return (RETURNok);
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}
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/****************************************************************************
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** **
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** Name: timer_start() **
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** **
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** Description: Schedules the execution of the given callback function **
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** upon expiration of the specified time interval **
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** **
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** Inputs: sec: The value of the time interval in seconds **
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** cb: Function executed upon timer expiration **
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** args: Callback argument parameters **
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** Others: None **
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** **
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** Outputs: None **
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** Return: The timer identifier when successfully **
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** started; NAS_TIMER_INACTIVE_ID otherwise. **
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** Others: None **
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** **
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***************************************************************************/
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int nas_timer_start(long sec, nas_timer_callback_t cb, void *args)
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{
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int id;
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nas_timer_entry_t *te;
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int ret;
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long timer_id;
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/* Do not start null timer */
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if (sec == 0) {
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return (NAS_TIMER_INACTIVE_ID);
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}
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/* Get an identifier for the new timer entry */
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id = _nas_timer_db_get_id();
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if (id < 0) {
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/* No available timer entry found */
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return (NAS_TIMER_INACTIVE_ID);
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}
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/* Create a new timer entry */
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te = _nas_timer_db_create_entry(sec, cb, args);
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if (te == NULL) {
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return (NAS_TIMER_INACTIVE_ID);
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}
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/* Insert the new entry into the timer queue */
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_nas_timer_db_insert_entry(id, te);
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ret = timer_setup(sec, 0, TASK_NAS_UE, INSTANCE_DEFAULT, TIMER_PERIODIC, args, &timer_id);
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if (ret == -1) {
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return NAS_TIMER_INACTIVE_ID;
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}
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te->timer_id = timer_id;
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return (id);
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}
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/****************************************************************************
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** **
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** Name: timer_stop() **
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** **
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** Description: Stop the timer with the specified identifier **
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** **
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** Inputs: id: The identifier of the timer to be stopped **
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** Others: None **
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** **
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** Outputs: None **
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** Return: NAS_TIMER_INACTIVE_ID when successfully stop- **
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** ped; The timer identifier otherwise. **
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** Others: None **
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** **
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***************************************************************************/
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int nas_timer_stop(int id)
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{
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/* Check if the timer entry is active */
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if (_nas_timer_db_is_active(id)) {
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nas_timer_entry_t *entry;
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/* Remove the entry from the timer queue */
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entry = _nas_timer_db_remove_entry(id);
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timer_remove(entry->timer_id);
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/* Delete the timer entry */
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_nas_timer_db_delete_entry(id);
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return (NAS_TIMER_INACTIVE_ID);
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}
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return (id);
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}
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/****************************************************************************
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** **
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** Name: timer_restart() **
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** **
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** Description: Restart the timer with the specified identifier. The ti- **
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** mer is scheduled to expire after the same period of time **
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** and will execute the callback function that has been set **
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** when it was started. **
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** **
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** Inputs: id: The identifier of the timer to be started **
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** again **
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** Others: None **
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** **
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** Outputs: None **
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** Return: The timer identifier when successfully **
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** re-started; NAS_TIMER_INACTIVE_ID otherwise. **
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** Others: None **
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** **
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***************************************************************************/
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int nas_timer_restart(int id)
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{
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/* Check if the timer entry is active */
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if (_nas_timer_db_is_active(id)) {
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/* Remove the entry from the timer queue */
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nas_timer_entry_t *te = _nas_timer_db_remove_entry(id);
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/* Initialize its interval timer value */
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te->tv = te->itv;
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/* Insert again the entry into the timer queue */
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_nas_timer_db_insert_entry(id, te);
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return (id);
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}
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return (NAS_TIMER_INACTIVE_ID);
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}
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/*
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* -----------------------------------------------------------------------------
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* Functions used to manage the timer database
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* -----------------------------------------------------------------------------
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*/
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/****************************************************************************
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** **
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** Name: _nas_timer_db_init() **
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** **
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** Description: Initializes the timer database **
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** **
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** Inputs: None **
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** Others: None **
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** **
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** Outputs: None **
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** Return: None **
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** Others: _nas_timer_db **
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** **
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***************************************************************************/
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static void _nas_timer_db_init(void)
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{
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int i;
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for (i = 0; i < TIMER_DATABASE_SIZE; i++) {
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_nas_timer_db.tq[i].id = NAS_TIMER_INACTIVE_ID;
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}
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}
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/****************************************************************************
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** **
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** Name: _nas_timer_db_get_id() **
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** **
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** Description: Gets the identifier of the first available timer entry in **
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** the queue of active timer entries **
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** **
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** Inputs: None **
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** Others: _nas_timer_db **
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** **
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** Outputs: None **
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** Return: The identifier of the first available **
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** timer entry if the queue of active timers **
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** is not full; -1 otherwise. **
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** Others: _nas_timer_db **
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** **
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***************************************************************************/
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static int _nas_timer_db_get_id(void)
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{
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int i;
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/* Search from the current timer entry to the last timer entry */
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for (i = _nas_timer_db.timer_id; i < TIMER_DATABASE_SIZE; i++) {
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if (_nas_timer_db.tq[i].id < 0 ) {
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_nas_timer_db.timer_id = i+1;
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return i;
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}
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}
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/* Search from the first timer entry to the current timer entry */
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for (i = 0; i < _nas_timer_db.timer_id; i++) {
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if (_nas_timer_db.tq[i].id < 0 ) {
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_nas_timer_db.timer_id = i+1;
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return i;
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}
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}
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/* No available timer entry found */
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return (-1);
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}
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/****************************************************************************
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** **
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** Name: _nas_timer_db_is_active() **
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** **
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** Description: Checks whether the entry with the given identifier is **
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** active within the queue of active timer entries **
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** **
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** Inputs: id: Identifier of the timer entry to check **
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** Others: _nas_timer_db **
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** **
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** Outputs: None **
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** Return: true if the timer entry is active; false **
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** if it is not an active timer entry. **
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** Others: None **
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** **
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***************************************************************************/
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static bool _nas_timer_db_is_active(int id)
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{
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return ( (id != NAS_TIMER_INACTIVE_ID) &&
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(_nas_timer_db.tq[id].id != NAS_TIMER_INACTIVE_ID) );
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}
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/****************************************************************************
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** **
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** Name: _nas_timer_db_create_entry() **
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** **
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** Description: Creates a new timer entry **
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** **
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** Inputs: sec: Time interval value **
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** cb: Function executed upon timer expiration **
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** args: Callback argument parameters **
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** Others: None **
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** **
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** Outputs: None **
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** Return: A pointer to the new timer entry if **
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** successfully allocated; NULL otherwise **
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** Others: None **
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** **
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***************************************************************************/
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static nas_timer_entry_t *_nas_timer_db_create_entry(
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long sec, nas_timer_callback_t cb,
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void *args)
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{
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nas_timer_entry_t *te = (nas_timer_entry_t *)malloc(sizeof(nas_timer_entry_t));
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if (te != NULL) {
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te->itv.tv_sec = sec;
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te->itv.tv_usec = 0;
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te->tv.tv_sec = te->itv.tv_sec;
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te->tv.tv_usec = te->itv.tv_usec;
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te->cb = cb;
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te->args = args;
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}
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return (te);
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}
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/****************************************************************************
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** **
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** Name: _nas_timer_db_delete_entry() **
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** **
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** Description: Deletes the entry with the given identifier from the ti- **
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** mer database. **
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** **
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** Inputs: id: Identifier of the entry to be deleted **
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** Others: None **
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** **
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** Outputs: None **
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** Return: None **
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** Others: _nas_timer_db **
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** **
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***************************************************************************/
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static void _nas_timer_db_delete_entry(int id)
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{
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/* The identifier of the timer is valid within the timer queue */
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assert(_nas_timer_db.tq[id].id == id);
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/* Delete the timer entry from the queue */
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_nas_timer_db.tq[id].id = NAS_TIMER_INACTIVE_ID;
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free(_nas_timer_db.tq[id].entry);
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_nas_timer_db.tq[id].entry = NULL;
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}
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/****************************************************************************
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** **
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** Name: _nas_timer_db_insert_entry() **
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** **
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** Description: Inserts the entry with the given identifier into the **
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** queue of active timer entries and restarts the system **
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** timer if the new entry is the next entry for which the **
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** timer should be scheduled to expire. **
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** **
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** Inputs: id: Identifier of the new entry **
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** te: Pointer to the entry to be inserted **
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** Others: None **
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** **
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** Outputs: None **
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** Return: None **
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** Others: _nas_timer_db **
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** **
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***************************************************************************/
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static void _nas_timer_db_insert_entry(int id, nas_timer_entry_t *te)
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{
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struct itimerval it;
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struct timespec ts;
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struct timeval current_time;
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int restart;
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/* Enqueue the new timer entry */
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_nas_timer_db.tq[id].id = id;
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_nas_timer_db.tq[id].entry = te;
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/* Save its interval timer value */
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it.it_interval.tv_sec = it.it_interval.tv_usec = 0;
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it.it_value = te->tv;
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/* Update its interval timer value */
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clock_gettime(CLOCK_MONOTONIC, &ts);
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current_time.tv_sec = ts.tv_sec;
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current_time.tv_usec = ts.tv_nsec/1000;
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/* tv = tv + time() */
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_nas_timer_add(&te->tv, ¤t_time, &te->tv);
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/* Insert the new timer entry into the list of active entries */
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nas_timer_lock_db();
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restart = _nas_timer_db_insert(&_nas_timer_db.tq[id]);
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nas_timer_unlock_db();
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(void)(restart);
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}
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static int _nas_timer_db_insert(timer_queue_t *entry)
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{
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timer_queue_t *prev, *next; /* previous and next entry in the list */
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/*
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* Search the list of timer entries for the first entry with an interval
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* timer value greater than the interval timer value of the new timer entry
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*/
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for (prev = NULL, next = _nas_timer_db.head; next != NULL; next = next->next) {
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if (_nas_timer_cmp(&next->entry->tv, &entry->entry->tv) > 0) {
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break;
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}
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prev = next;
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}
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/* Insert the new entry in the list of active timer entries */
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/* prev <-- entry --> next */
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entry->prev = prev;
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entry->next = next;
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/* Update the pointer from the previous entry */
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if (entry->next != NULL) {
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/* prev <-- entry <--> next */
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entry->next->prev = entry;
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}
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/* Update the pointer from the next entry */
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if (entry->prev != NULL) {
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/* prev <--> entry <--> next */
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entry->prev->next = entry;
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} else {
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/* The new entry is the first entry of the list */
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_nas_timer_db.head = entry;
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return true;
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}
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/* The new entry is NOT the first entry of the list */
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return false;
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}
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/****************************************************************************
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** **
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** Name: _nas_timer_db_remove_entry() **
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** **
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** Description: Removes the entry with the given identifier from the **
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** queue of active timer entries and restarts the system **
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** timer if the entry was the next entry for which the timer **
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** was scheduled to expire. **
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** **
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** Inputs: id: Identifier of the entry to be removed **
|
|
** Others: None **
|
|
** **
|
|
** Outputs: None **
|
|
** Return: A pointer to the removed entry **
|
|
** Others: _nas_timer_db **
|
|
** **
|
|
***************************************************************************/
|
|
static nas_timer_entry_t *_nas_timer_db_remove_entry(int id)
|
|
{
|
|
bool restart;
|
|
|
|
/* The identifier of the timer is valid within the timer queue */
|
|
assert(_nas_timer_db.tq[id].id == id);
|
|
|
|
/* Remove the timer entry from the list of active entries */
|
|
nas_timer_lock_db();
|
|
restart = _nas_timer_db_remove(&_nas_timer_db.tq[id]);
|
|
nas_timer_unlock_db();
|
|
|
|
if (restart) {
|
|
int rc;
|
|
/* The entry was the first entry of the list;
|
|
* the system timer needs to be restarted */
|
|
struct itimerval it;
|
|
struct timeval tv;
|
|
struct timespec ts;
|
|
|
|
it.it_interval.tv_sec = it.it_interval.tv_usec = 0;
|
|
|
|
clock_gettime(CLOCK_MONOTONIC, &ts);
|
|
|
|
tv.tv_sec = ts.tv_sec;
|
|
tv.tv_usec = ts.tv_nsec/1000;
|
|
/* tv = tv - time() */
|
|
rc = _nas_timer_sub(&_nas_timer_db.head->entry->tv, &tv, &it.it_value);
|
|
timer_remove(_nas_timer_db.head->entry->timer_id);
|
|
(void) (rc);
|
|
}
|
|
|
|
/* Return a pointer to the removed entry */
|
|
return (_nas_timer_db.tq[id].entry);
|
|
}
|
|
|
|
static bool _nas_timer_db_remove(timer_queue_t *entry)
|
|
{
|
|
/* Update the pointer from the previous entry */
|
|
/* prev ---> entry ---> next */
|
|
/* prev <--- entry <--- next */
|
|
if (entry->next != NULL) {
|
|
/* prev ---> entry ---> next */
|
|
/* prev <-------------- next */
|
|
entry->next->prev = entry->prev;
|
|
}
|
|
|
|
/* Update the pointer from the next entry */
|
|
if (entry->prev != NULL) {
|
|
/* prev --------------> next */
|
|
/* prev <-------------- next */
|
|
entry->prev->next = entry->next;
|
|
} else {
|
|
/* The entry was the first entry of the list */
|
|
_nas_timer_db.head = entry->next;
|
|
|
|
if (_nas_timer_db.head != NULL) {
|
|
/* Other timers are scheduled to expire */
|
|
return true;
|
|
}
|
|
}
|
|
|
|
/* The entry was NOT the first entry of the list */
|
|
return false;
|
|
}
|
|
|
|
/*
|
|
* -----------------------------------------------------------------------------
|
|
* Operator functions for timeval structures
|
|
* -----------------------------------------------------------------------------
|
|
*/
|
|
/****************************************************************************
|
|
** **
|
|
** Name: _nas_timer_cmp() **
|
|
** **
|
|
** Description: Performs timeval comparaison **
|
|
** **
|
|
** Inputs: a: The first timeval structure **
|
|
** b: The second timeval structure **
|
|
** Others: None **
|
|
** **
|
|
** Outputs: None **
|
|
** Return: -1 if a < b; 1 if a > b; 0 if a == b **
|
|
** Others: None **
|
|
** **
|
|
***************************************************************************/
|
|
static int _nas_timer_cmp(const struct timeval *a, const struct timeval *b)
|
|
{
|
|
if (a->tv_sec < b->tv_sec) {
|
|
return -1;
|
|
} else if (a->tv_sec > b->tv_sec) {
|
|
return 1;
|
|
} else if (a->tv_usec < b->tv_usec) {
|
|
return -1;
|
|
} else if (a->tv_usec > b->tv_usec) {
|
|
return 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/****************************************************************************
|
|
** **
|
|
** Name: _nas_timer_add() **
|
|
** **
|
|
** Description: Performs timeval addition **
|
|
** **
|
|
** Inputs: a: The first timeval structure **
|
|
** b: The second timeval structure **
|
|
** Others: None **
|
|
** **
|
|
** Outputs: result: result = timeval(a + b) **
|
|
** Return: None **
|
|
** Others: None **
|
|
** **
|
|
***************************************************************************/
|
|
static void _nas_timer_add(const struct timeval *a, const struct timeval *b,
|
|
struct timeval *result)
|
|
{
|
|
result->tv_sec = a->tv_sec + b->tv_sec;
|
|
result->tv_usec = a->tv_usec + b->tv_usec;
|
|
|
|
if (result->tv_usec > 1000000) {
|
|
result->tv_sec++;
|
|
result->tv_usec -= 1000000;
|
|
}
|
|
}
|
|
|
|
/****************************************************************************
|
|
** **
|
|
** Name: _nas_timer_sub() **
|
|
** **
|
|
** Description: Performs timeval substraction **
|
|
** **
|
|
** Inputs: a: The first timeval structure **
|
|
** b: The second timeval structure **
|
|
** Others: None **
|
|
** **
|
|
** Outputs: result: a >= b, result = timeval(a - b) **
|
|
** Return: -1 if a < b; 0 otherwise **
|
|
** Others: None **
|
|
** **
|
|
***************************************************************************/
|
|
static int _nas_timer_sub(const struct timeval *a, const struct timeval *b,
|
|
struct timeval *result)
|
|
{
|
|
if (_nas_timer_cmp(a,b) > 0 ) {
|
|
result->tv_sec = a->tv_sec - b->tv_sec;
|
|
result->tv_usec = a->tv_usec - b->tv_usec;
|
|
|
|
if (result->tv_usec < 0) {
|
|
result->tv_sec--;
|
|
result->tv_usec += 1000000;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
return -1;
|
|
}
|
|
|