I wanted to write a program which writes to multiple files simultaneously; thought it will be possible with one thread by using non-blocking mode. But FileChannel does not support non-blocking mode. Does anybody know why?
UNIX does not support non-blocking I/O for files, see Non-blocking I/O with regular files . As Java should (at least try to) provide the same behaviour on all platforms, the FileChannel
does not implement SelectableChannel
.
However Java 7 will include a new AsynchronousFileChannel
class that supports asynchronous file I/O, which is a different mechanism to non-blocking I/O.
In general only sockets and pipes truly support non-blocking I/O via select()
mechanism.
简而言之,大多数操作系统不会将常规文件视为可以阻止的内容 - 因此它们不允许您将它们显式设置为非阻塞状态。
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