Make syntax check to run in separate thread

[petRUShka]

Now after save syntax check process blocks VIM. It is ok if it takes less then 0.5 sec. But it's far from ok if it takes more then 3 second. For example when I try to save or open *.feature file (cucumber) VIM froze for about 3-5 sec.

If one runs binaries for syntax check in parallel thread it will be ok.

May be VIM build-in mzscheme-threads helps: http://vimdoc.sourceforge.net/htmldoc/if_mzsch.html#mzscheme-threads

[zenzike]

Yes, or maybe use https://github.com/pydave/AsyncCommand as a means of getting asynchronous commands to run.

[int3]

@scrooloose is there interest in having this implemented? It would really help make the experience with some of the slower checkers (like g++) better.

[lcd047]

Please see #699.