[jdk17] RFR: 8269865: Async UL needs to handle ERANGE on exceeding SEM_VALUE_MAX

[Xin Liu]

On Thu, 8 Jul 2021 09:43:11 GMT, David Holmes <david.holmes at oracle.com> wrote:

> One possibility is to change the code to use a Monitor that acts as the
asynclog lock and the wakeup mechanism, with a suitable guard in the
writing code so that we don't try to use the Monitor until after it has
been initialised (which is after the first log writes may occur).

I am not sure about that. The current code derived from there. HotSpot Monitor needs Thread::current(), but the logging event spans from the very beginning to the very end of JVM. We have to circumvent those cases. 

On the other hand, I carefully read the implementation of semaphore_signal on Darwin. I am pretty sure it returns KERN_SUCCESS when overflow happens. I added a line of comment in the last revision. Could you take a look at that?

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PR: https://git.openjdk.java.net/jdk17/pull/216