Martin Stein 8eef91f2ac hw: do not block on destruction of signal receiver
As synchronization of signal contexts is now the users business instead of
cores and the signal framework ensures that every context of a receiver gets
synchronously destructed before the destruction of the receiver itself
synchronization and thus blocking at the destruction of a kernel
receiver-object isn't necessary anymore.

ref #989
2013-12-20 14:48:06 +01:00
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