Unblocking blocked I/O

Wed Sep 19 07:30:00 GMT 2001

On 2001年9月18日, David Vrabel wrote:
> I have a thread which blocks while reading from a network Socket. I need
> to unblock the thread so it can see it's supposed to die (and then die
> gracefully).

The java script in Sun's jdk 1.3.1 has this to say:
 "# bug #4344135 workaround
 # A thread currently waiting on a I/O operation will not wake up if one
 # of the files involved is actually closed (last close - the file is
 # no longer accessible but the thread is still waiting in the kernel).
 # The library libpreemptive_close.so is dynamically linked to the JVM"
Is this helpful? I'm guessing that libpreemtive_close.so provides
replacement read() and close() etc. Perhaps (really wild guess) the
replacement read() sets a flag when entered (and unsets it on exit) and
the close() signals the thread if the flag is set? This would unblock the
read() right?
David Vrabel