On 28 Aug 2009, at 23:38, Michael Durket wrote:
Does anyone here know if an Objective C program, written to only
link with libobjc and no other Objective C
frameworks (so that the programs can only use whatever objects
reside in libobjc like Object I presume)
will operate correctly in a multi-threaded environment? Put another
way, can Objective C using only libobjc
work everywhere C can - i.e. as an Apache module, or a device driver
(assuming proper interface code),
or as system code?
Yes, libobjc is reentrant. Very few bits of libobjc need to be thread
safe in general use (message lookup does, for example, but that's a
simple sparse array lookup). The rest is protected by mutexes. As
long as you don't use any low-level runtime functions without reading
the documentation about which mutex you need to acquire, it will all
work.
David
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