René Kijewski 5f29fed076 core: introduce msg_sent_by_int()
msg_send_int() sets `m->sender_pid = target_pid`. This was used to flag a
message as having been sent by an ISR.

This PR introduces a static inline function `msg_sent_by_int()` and a
specific define for this purpose.
2014-12-18 23:04:03 +01:00
..
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