nuttx-apps/examples/watched/watched_main.c

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/****************************************************************************
* examples/watched/watched_main.c
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership. The
* ASF licenses this file to you 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.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <stdio.h>
#include <errno.h>
#include <stdlib.h>
#include "watched.h"
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/****************************************************************************
* Private Types
****************************************************************************/
/****************************************************************************
* Private Data
****************************************************************************/
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: Task that feeds the dog
****************************************************************************/
static int task1(int argc, FAR char *argv[])
{
struct watched_info_s watched_info;
/* Get the necessary information from watcher */
watched_read_watcher_info(&watched_info);
watched_subscribe(&watched_info);
for (; ; )
{
feed_dog(&watched_info);
sleep(3);
}
return OK;
}
/****************************************************************************
* Name: Task that doesn't feed the dog
****************************************************************************/
static int task2(int argc, FAR char *argv[])
{
int counter = 0;
struct watched_info_s watched_info;
/* Get the necessary information from watcher */
watched_read_watcher_info(&watched_info);
watched_subscribe(&watched_info);
for (; ; )
{
sleep((CONFIG_EXAMPLES_WATCHER_TIMEOUT) / 1000);
counter++;
if (counter == 5)
{
watched_unsubscribe(&watched_info);
}
}
return OK;
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: null_main
****************************************************************************/
int main(int argc, char *argv[])
{
int ret = OK;
/* Check if the watcher has already been initialized */
if (!watched_is_watcher_on())
{
printf("Please, enable the watcher service \
before subscribing tasks!\n");
ret = ENOENT;
goto errout;
}
printf("Starting watched tasks\n");
/* Starting Tasks Tasks 1 and 4 will subscribe, but they will not feed the
* dog. Tasks 2 and 3 will subscribe and will feed the dog each 3 secs.
*/
printf("Creating Watched Task 1 - It will not feed the dog\n");
ret = task_create("Watched Task 1", CONFIG_EXAMPLES_WATCHED_PRIORITY,
CONFIG_EXAMPLES_WATCHED_STACKSIZE, task2, NULL);
if (ret < 0)
{
int errcode = errno;
printf("watched_main: ERROR: Failed to start Watched Task 1: %d\n",
errcode);
ret = errcode;
goto errout;
}
printf("Creating Watched Task 2 - It will feed the dog\n");
ret = task_create("Watched Task 2", CONFIG_EXAMPLES_WATCHED_PRIORITY,
CONFIG_EXAMPLES_WATCHED_STACKSIZE, task1, NULL);
if (ret < 0)
{
int errcode = errno;
printf("watched_main: ERROR: Failed to start Watched Task 2: %d\n",
errcode);
ret = errcode;
goto errout;
}
printf("Creating Watched Task 3 - It will feed the dog\n");
ret = task_create("Watched Task 3", CONFIG_EXAMPLES_WATCHED_PRIORITY,
CONFIG_EXAMPLES_WATCHED_STACKSIZE, task1, NULL);
if (ret < 0)
{
int errcode = errno;
printf("watched_main: ERROR: Failed to start Watched Task 3: %d\n",
errcode);
ret = errcode;
goto errout;
}
printf("Creating Watched Task 4 - It will not feed the dog\n");
ret = task_create("Watched Task 4", CONFIG_EXAMPLES_WATCHED_PRIORITY,
CONFIG_EXAMPLES_WATCHED_STACKSIZE, task2, NULL);
if (ret < 0)
{
int errcode = errno;
printf("watched_main: ERROR: Failed to start Watched Task 4: %d\n",
errcode);
ret = errcode;
goto errout;
}
errout:
return ret;
}