Queue

About

Use a queue to communicate between two threads.

Source code

/**
 * @file main.c
 *
 * @section License
 * Copyright (C) 2015-2016, Erik Moqvist
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * This file is part of the Simba project.
 */

#include "simba.h"

static struct queue_t queue;

static THRD_STACK(writer_stack, 256);

static void *writer_main(void *arg_p)
{
    int value;

    /* Write to the queue. */
    value = 1;
    queue_write(&queue, &value, sizeof(value));

    return (NULL);
}

int main()
{
    int value;

    sys_start();
    queue_init(&queue, NULL, 0);
    thrd_spawn(writer_main, NULL, 0, writer_stack, sizeof(writer_stack));

    /* Read from the queue. */
    queue_read(&queue, &value, sizeof(value));

    std_printf(FSTR("read value = %d\r\n"), value);

    return (0);
}

The source code can also be found on Github in the examples/queue folder.

Build and run

Build and upload the application.

$ cd examples/queue
$ make -s BOARD=<board> run
read value = 1