Withdrawn: In rare cases, the unlock() on join() might fail, causing an IllegalMonitorStateException

[Alan Bateman]

On Thu, 25 Feb 2021 11:10:41 GMT, kabutz <duke at openjdk.java.net> wrote:

> Unlike synchronized/wait, the Condition.await() method does not necessarily reacquire the lock on exit, for example if the thread is stopped or if CTRL+C is caused in jshell. In that case we would enter the finally block without the lock held and unlocking would cause an IllegalMonitorStateException.
> 
> For example, run the following code from jshell and then press CTRL+C:
> 
> 
> Object monitor = new Object();
> for (int i = 0; i < 10_000; i++) {
>   Thread.startVirtualThread(() -> {
>     synchronized (monitor) {
>       try {
>         monitor.wait();
>       } catch (InterruptedException ignore) {}
>     }
>   });
> }
> Thread.startVirtualThread(() -> System.out.println("done")).join();
> 
> 
> Output is:
> 
> 
> |  Exception java.lang.IllegalMonitorStateException
> |        at ReentrantLock$Sync.tryRelease (ReentrantLock.java:175)
> |        at AbstractQueuedSynchronizer.release (AbstractQueuedSynchronizer.java:1007)
> |        at ReentrantLock.unlock (ReentrantLock.java:494)
> |        at VirtualThread.joinNanos (VirtualThread.java:635)
> |        at Thread.join (Thread.java:2281)
> |        at Thread.join (Thread.java:2366)
> |        at (#3:1)

This pull request has been closed without being integrated.

-------------

PR: https://git.openjdk.java.net/loom/pull/32