Our Air Quality 66a84cb2ef Clarify that sys_arch_protect() always has a matching unprotect.
This is to allow an implementation to use a nesting counter, or a
recursive mutex. Also clarify that the value returned by
sys_arch_protect() is opaque to lwip and implementation dependent.

Signed-off-by: goldsimon <goldsimon@gmx.de>
2017-07-20 21:22:35 +02:00
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