RFR: JDK-8304723: Statically allocate global mutexes

[David Holmes]

On Wed, 22 Mar 2023 17:31:19 GMT, Justin King <jcking at openjdk.org> wrote:

> On posix, switch from pthread_cond_init to static initialization if possible.

Some platforms have the "wrong" default which is why we don't attempt to use the pthread static initializers. But in general statically initializing our Mutex/Monitor would be very fragile IMO - as discussed in the past.

Doing the allocation statically is a different matter. But what does this gain? Is the startup improvement noticeable?

> Created [JDK-8304736](https://bugs.openjdk.org/browse/JDK-8304736) and [JDK-8304738](https://bugs.openjdk.org/browse/JDK-8304738).

Thanks for that.

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PR Comment: https://git.openjdk.org/jdk/pull/13143#issuecomment-1480342887