[Mono-dev] signal.c cross-thread access

[tim.jenks at realtimeworlds.com]

Hi,

Attached is a patch to signal.c supporting cross-thread access.

Currently signal.c maintains a coarse grained mutex in each entry point
from managed code, including the blocking WaitAny call. This makes the
use of the UnixSignal* code limited at best - one thread may be sat in a
WaitAny for an undetermined period of time, blocking access to any other
managed thread wishing to use the signalling code.

This patch provides fine grained locking of the relevant singal_info
struct, and a removal of the coarse grained mutex, allowing multiple
threads to interact with the native signal code.

-Tim

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