* gnu/java/net/PlainDatagramSocketImpl.java
(RECEIVE_LOCK): New member field.
(SEND_LOCK): New member field.
(send0): New method.
(send): Synchronize on SEND_LOCK.
(receive0): New method.
(receive): Synchronize on RECEIVE_LOCK.
* gnu/java/net/natPlainDatagramSocketImplNoNet.cc,
gnu/java/net/natPlainDatagramSocketImplPosix.cc,
gnu/java/net/natPlainDatagramSocketImplWin32.cc
(send0): Renamed from send.
(receive0): Renamed from receive.
From-SVN: r79579
