On Mon, 27 Feb 2023 17:55:40 GMT, Leonid Mesnik <[email protected]> wrote:
>> test/lib/jdk/test/lib/process/ProcessTools.java line 224:
>>
>>> 222: if (!p.isAlive()) {
>>> 223: latch.countDown();
>>> 224: throw new RuntimeException("Started process "
>>> + name + " is not alive.");
>>
>> This seems problematic. The process has terminated but you don't know why -
>> it may have completed normally and produced all the output such that the
>> `await` below would return immediately with `true`, but you are now going to
>> throw an exception. ???
>
> Thanks! You are right, we need to check first if the line has been printed.
> However, there is an interesting question the process can exit before streams
> are read and the latch is set to zero. The documentation says that
> linePredicate should detect if the process is warmed-up. So it is not
> expected that it should exit right after the start.
Yes there remains a race, if the process exits but the streamPumper has not yet
had the chance to call `countDown` then we would again throw the exception.
Perhaps all we can do is give a little extra time after decting a dead process?
if (!p.isAlive()) {
if (latch.getCount() > 0) {
// Give some extra time for the StreamPumper to run after the process
completed
Thread.sleep(1000);
if (latch.getCount() > 0) {
throw new RuntimeException("Started process " + name + " but it terminated
without the expected output");
}
}
-------------
PR: https://git.openjdk.org/jdk/pull/12751
