reason for code like this: "do { something } while (0)"
am 15.05.2006 11:48:41 von Rajat JainHi,
I'm asking a pretty amateur question.
I've come accross code like this huge number of times in the kernel:
#define __set_task_state(tsk, state_value) \
do { (tsk)->state = (state_value); } while (0)
What is the reason to use do while loop if it is only meant to be
executed just once? Why not a simple:
#define __set_task_state(tsk, state_value) \
{ (tsk)->state = (state_value); }
TIA,
Rajat
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