Malloc from ISR?

[Mr. Andrei Chichak]

I’m working with ST’s HAL USB stack, and to initialize the various structures, they use a USB interrupt as a trigger.

In this interrupt,  they malloc some space for a descriptor (504 bytes).

The RTEMS malloc always returns 0.

Is there a guard against calling malloc in an interrupt context?

I managed to get around the problem by doing a static allocation, but I was just wondering.


Andrei