If i stop and restart the wifi, or the Mac goes in power save mode and turn off the radios. When developing a website, a web designer needs to be able to see his webpages in the same way the end user would.On some platforms, there can be a race leading to segfaults if two threads call this function nearly simultaneously. Those environments allow you to programmatically change the global locale preference, which remains in effect until you explicitly change it again. Change locale mac If you drop the dash, it fails: which locale.