[riot-notifications] [RIOT] core: priority_queue_add hangs on duplicate adds (#3132)

Kaspar Schleiser notifications at github.com
Mon Jun 1 11:47:29 CEST 2015

@gebart I share @OlegHahm's concerns regarding the hotness of this code. This priority queue is used in the scheduler. A context switch is 500 instructions. 5 instructions more lower our context switch speed by 1%.

IMHO we need more specific conventions for this. My preferred solution here would be a simple ```assert(node->next == new_obj)```, with asserts (or -DNDEBUG) coupled to DEVELHELP.

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