Quality RTOS & Embedded Software

 Real time embedded FreeRTOS RSS feed 
Quick Start Supported MCUs PDF Books Trace Tools Ecosystem


Loading

xSemaphoreGive in critial section

Posted by paha11 on December 22, 2014

Hello

I wonder if it's possible to call xSemaphoreGive withing critical section. Something like

taskENTERCRITICAL(); .... xSemaphoreGive(AppTasks[curr->taskId].loopSem); .... taskEXIT_CRITICAL();

I used it in situation where needed to do some linked list operation.

From the source code of FreeRTOS 7.0.0 of function xQueueGenericSend(..) in queue.c I saw that immediate task swith can be made so the above code shall be NO NO? Thank you for any comment Regards


xSemaphoreGive in critial section

Posted by davedoors on December 22, 2014

The rule is dont do it, but you might get away with it on a give depending on task priorities. At best the wrong task might be scheduled because a context switch away cant happen, at worst you will get a horrible logic error and crash for the same reason. Definitely dont do it on a take!


xSemaphoreGive in critial section

Posted by paha11 on December 23, 2014

Dave,

thanks for the link. That's what I was looking for. Regards Pavel


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


Copyright (C) Amazon Web Services, Inc. or its affiliates. All rights reserved.

Latest News

NXP tweet showing LPC5500 (ARMv8-M Cortex-M33) running FreeRTOS.

Meet Richard Barry and learn about running FreeRTOS on RISC-V at FOSDEM 2019

Version 10.1.1 of the FreeRTOS kernel is available for immediate download. MIT licensed.

View a recording of the "OTA Update Security and Reliability" webinar, presented by TI and AWS.


Careers

FreeRTOS and other embedded software careers at AWS.



FreeRTOS Partners

ARM Connected RTOS partner for all ARM microcontroller cores

Espressif ESP32

IAR Partner

Microchip Premier RTOS Partner

RTOS partner of NXP for all NXP ARM microcontrollers

Renesas

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

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

OpenRTOS and SafeRTOS

Xilinx Microblaze and Zynq partner