IAR & OS_CREATETASK() and __task

Arne · Aug 11th 2011, 11:47am

Hi,

IAR EWARM allows to put an extended keyword "__task" in front of a thread. If I do so then I get a compiler error in the line of OS_CREATETASK():

C Source Code

__task extern void TerminalManagerThread(void)
{
...
}

in main() I do:

C Source Code

OS_CREATETASK(&gTerminalThreadTCB, "Terminal-Thread", TerminalManagerThread, 2, gTerminalThreadStack_PU32);

and get this error:

Error[Pe167]: argument of type "void (__interwork __task *)(void)" is incompatible with parameter of type "void (*)(void)" D:\ZSE\main.c 762

Without __task everything works fine. Any idea how to solve this one?

Thanks, Arne

SEGGER - Til · Aug 11th 2011, 5:08pm

Hello Arne,

the IAR function type attribute __task relaxes the rules for preserving registers, which means that not all preserved registers are saved on the task stack.
Right now it is not possible to use it with embOS but it makes not a big difference as long as not much preserverd registers are used in the task routine, e.g. in complex calculations.

Best regards,
Til

C Source Code

C Source Code

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