implement our own "once" function #2086
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My affection to using closures instead of declaring callbacks (and global variables) is strong enough to define a replacement for
pthread_oncefunction that takes a closure as an argument.Actually, this PR fixes theoretical race conditions in some of the initialization code that we run. 9c06f68 addresses two cases where an "index" might be used by a different thread, before the objects that are being referred to by that "index" is being written to memory.