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

post/receive multiple items to/from a queue

Posted by Nobody/Anonymous on August 28, 2006
Hi there,

Does anyone out there feel the need to post/retrieve multiple items from a queue in one call?
If you get items one by one, a lot of overhead is generated. It would be much more efficient to call the memcpy in prvCopyQueueData() only once.

For the receiving case I would like to propose a function which blocks the calling task until the number of requested items are received, or exits after the specified number of timeout ticks.

If a timeout occurs, the function can either return nothing or the items which have been retrieved.

Paul

RE: post/receive multiple items to/from a queue

Posted by Nobody/Anonymous on August 28, 2006
How about having the code stuffing data into the queue use larger number of bytes? It puts in a whole structure at a time for example, rather than one byte at a time.

RE: post/receive multiple items to/from a que

Posted by Nobody/Anonymous on August 29, 2006
That's easy: call xQueueCreate with as 2nd argument the size of your struct.
xQueueSend and xQueueReceive accept a pointer to the base of your struct variable

My problem is how to post a variable number or items.

Paul


[ 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