Quality RTOS & Embedded Software

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


Loading

heap_2.c causes out of memory

Posted by Martin Velek on August 20, 2009
Hello,

I am running this code:
void testMem(void *pvParameters)
{
unsigned char * mem;
for (int v = 0; v < 100000; v++)
{
for (int i = 1900; i < 2500; i++)
{
mem = (unsigned char *) pvPortMalloc((i) * sizeof(unsigned char));
if (NULL == mem)
{
// set breakpoint here
}
vPortFree(mem);
}
}
}
and after a while the mem becomes null and breakpoint is hitted. This code is running on CortexM3, LM3S8962 copiled by gcc or IAR and freeRTOS 5.4.2. Memory is configTOTAL_HEAP_SIZE ( ( size_t ) ( 32768 ) ).
This is a school problem example but I have discovered it in the real situation during receiving ethernet packets.
Have anyone the same problem?

Regard,
Martin

RE: heap_2.c causes out of memory

Posted by Dave on August 20, 2009
This will be caused by memory fragmentation. See http://www.freertos.org/a00111.html where it says heap_2 "Should not be used if the memory being allocated and freed is of a random size".

RE: heap_2.c causes out of memory

Posted by Martin Velek on August 24, 2009
Hi Dave,
thanks a lot. This was my problem. I am trying to implement a bget maybe it will help.


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


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

Latest News

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