Which allocation scheme does ESP8266 RTOS SDK use? : Kacang Bawang

I wanted to know which memory allocation scheme (heap_1.c, heap_2.c, heap_3.c, heap_4.c or heap_5.c) was used in the ESP8266 RTOS SDK. This is not mentioned anywhere in the docs (I’ve looked as of 1/12/16). What to do?

Let’s just take a look at what is compiled in then.

$ cd /path/to/RTOSSDK/lib
$ xtensa-lx106-elf-nm libfreertos.a | grep -50 "T pvPortMalloc"

1 2	$ cd /path/to/RTOSSDK/lib $ xtensa-lx106-elf-nm libfreertos.a \| grep -50 "T pvPortMalloc"

Actually, this works even with a regular ‘nm’, hehe.

What do we see?

heap_4.o:
...
00000038 T pvPortMalloc
...

heap_4.o:

...

00000038 T pvPortMalloc

...

Aha! heap_4.o means heap_4.c was used. ‘T’ means that this symbol is exported.

Kacang Bawang

Which allocation scheme does ESP8266 RTOS SDK use?

by kacang bawang