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Posted to issues@commons.apache.org by GitBox <gi...@apache.org> on 2019/04/27 18:10:02 UTC

[GitHub] [commons-vfs] garydgregory commented on issue #36: fix for VFS-662: SftpFileSystem has Thread-safe issue about idleChannel

garydgregory commented on issue #36: fix for VFS-662: SftpFileSystem has Thread-safe issue about idleChannel
URL: https://github.com/apache/commons-vfs/pull/36#issuecomment-487307909
 
 
   @qxo ,
   
   I looked at this today and was reminded that DCL is broken: https://www.javaworld.com/article/2074979/double-checked-locking--clever--but-broken.html
   
   I will consider this some more but there are two alternatives: synchronize `getChannel()` and `putChannel()` or, more simply, use eager initialization of the `idleChannel` ivar.
   
   _To be continued..._

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