Quality RTOS & Embedded Software

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


Context Switch Hook

Posted by jdabbs003 on December 8, 2009
I am trying to adapt a vendor printf/sprintf/sscanf library, which is not reentrant. I am looking for a way to set a global pointer to a task specific context value each time a task is switched in. So far, I've thought of extending the port context structure with another pointer (messy) or using a callback hook to set a global pointer everytime a task switch happens (better). Is there an official way or best way to do something like this? Thanks.

RE: Context Switch Hook

Posted by jdabbs003 on December 8, 2009
Actually, to be clear, what I want is a user global variable that changes with each task switch to a task-specific value, exactly like how pxCurrentTCB works.

Is there a way to do this with FreeRTOS?

RE: Context Switch Hook

Posted by MEdwards on December 8, 2009
Search through the forum for threads that mention newlib as there is a link to a neat way of doing this with the newlib context pointer.

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

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

Latest News

FreeRTOS kernel V10 is available for immediate download. Now MIT licensed.

FreeRTOS Partners

ARM Connected RTOS partner for all ARM microcontroller cores

IAR Partner

Microchip Premier RTOS Partner

RTOS partner of NXP for all NXP ARM microcontrollers

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