Queue¶
About¶
Use a queue to communicate between two threads.
Source code¶
/**
* @section License
*
* The MIT License (MIT)
*
* Copyright (c) 2014-2017, Erik Moqvist
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use, copy,
* modify, merge, publish, distribute, sublicense, and/or sell copies
* of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*
* 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