Quality RTOS & Embedded Software

 Real time embedded FreeRTOS RSS feed 
Real time embedded FreeRTOS mailing list 
Quick Start Supported MCUs PDF Books Trace Tools Ecosystem TCP & FAT Training




Loading

How to peek a mutex?

Posted by nachus001 on April 30, 2010
Hi all:

I have a FreeRTOS system compiled and working, but now arised the need to know (from a control task)
if a mutex is free or taken without taking it, this is I need to "peek" the mutex, as when peeking a queue.
Is this possible?

Thanks in advance
Ignacio

RE: How to peek a mutex?

Posted by Richard Damon on April 30, 2010
One way to do this is a take with a 0 tick timeout, and if successful immediately give it back.

RE: How to peek a mutex?

Posted by Richard on April 30, 2010
Semaphores and queues use the same data structures. I have not actually tried, but think you could probably pass a semaphore handle into xQueuePeek() successfully. Give it a test to see.

Regards.

RE: How to peek a mutex?

Posted by nachus001 on May 3, 2010
Yeiiii!! it worked!
You must provide that...

if(xQueuePeek((xQueueHandle)THE_mutex,(void *)NULL,(portTickType)NULL) != pdTRUE)
{

// the mutex is taken

}else{
// the mutex is free

}


Thank you
Ignacio


[ Back to the top ]    [ About FreeRTOS ]    [ Sitemap ]    [ ]




Copyright (C) 2004-2010 Richard Barry. Copyright (C) 2010-2016 Real Time Engineers Ltd.
Any and all data, files, source code, html content and documentation included in the FreeRTOSTM distribution or available on this site are the exclusive property of Real Time Engineers Ltd.. See the files license.txt (included in the distribution) and this copyright notice for more information. FreeRTOSTM and FreeRTOS.orgTM are trade marks of Real Time Engineers Ltd.

Latest News:

FreeRTOS V9.0.0 is now available for download.


Free TCP/IP and file system demos for the RTOS


Sponsored Links

⇓ Now With No Code Size Limit! ⇓
⇑ Free Download Without Registering ⇑


FreeRTOS Partners

ARM Connected RTOS partner for all ARM microcontroller cores

Renesas Electronics Gold Alliance RTOS Partner.jpg

Microchip Premier RTOS Partner

RTOS partner of NXP for all NXP ARM microcontrollers

Atmel RTOS partner supporting ARM Cortex-M3 and AVR32 microcontrollers

STMicro RTOS partner supporting ARM7, ARM Cortex-M3, ARM Cortex-M4 and ARM Cortex-M0

Xilinx Microblaze and Zynq partner

Silicon Labs low power RTOS partner

Altera RTOS partner for Nios II and Cortex-A9 SoC

Freescale Alliance RTOS Member supporting ARM and ColdFire microcontrollers

Infineon ARM Cortex-M microcontrollers

Texas Instruments MCU Developer Network RTOS partner for ARM and MSP430 microcontrollers

Cypress RTOS partner supporting ARM Cortex-M3

Fujitsu RTOS partner supporting ARM Cortex-M3 and FM3

Microsemi (previously Actel) RTOS partner supporting ARM Cortex-M3

Atollic Partner

IAR Partner

Keil ARM Partner

Embedded Artists