some threading experiments
various improvements
little improvement to thread type
add some locks
port to libuv threads and mutex
remove stdlib=libc++ from Makefile
introduce several new locks
fix some locks
do not gc root parameters in threads (as gc is disabled)
more improvements
crashing.jl does not crash anymore
revert ast.c
cleanup
macrofication
update crashing.jl and fix the new crash
no locking in main thread (workaround)
add median filter example which is slower on two threads
a little better locking in gc. introduce parallel imfilter test
cleanup threading.jl test file and introduce an example where type instantiation slows thing seriously down
implement thread aware memory pool