To solve some weird "periodic" hangs where a script depends on the output of a previous portion of the script, I've had to insert "sync" command. My scripts use awk, sed, and grep, to name a few.
I haven't come up with a simple test case yet, but thought I'd raise a caution flag.
It would be interesting to repeat those hangs without, and then fixes with sync on cygwin, because sync on cygwin is a no-op. See the src.
Only explicit fsync(3) calls will help.
Or most likely a small sleep() will help. your sync just burned some cycles in spirit to sleep.
Filesystems are lazy, not just a windows fs. -- Reini Urban http://xarch.tu-graz.ac.at/home/rurban/
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