A portable way to determine is current context a task or ISR?

Kernel
1

Hello to all Realtime developers!

In my firmware I need to implement a function that uses some FreeRTOS features (e.g. push to queue) and that could be executed either in a task or in ISR. FreeRTOS has distinct API functions for task (xQueueSend) and for ISR (xQueueSendFromISR). So my function needs to determine is it called from a task or from ISR.

There is STM32 CMSIS-RTOS API where API functions are suitable to use both in task in ISR. They use the following function to determine current context:

/* Determine whether we are in thread mode or handler mode. */
static int inHandlerMode (void)
{
return __get_IPSR() != 0;
}

but this is obviously not portable and will not work on cores other than Cortex M.

Is there a more portable way to determine is the current context a task or ISR?

2

No, there is not, because not all MCUs support this detection in the first place.

3

The closest is probably the function xPortIsInsideInterrupt() which is defined in port macro.h in many of the ports that have that capability.