RFR(S): 8230422: Convert uninterruptible os::sleep calls to os::naked_short_sleep

[Daniel D. Daugherty]

On 9/4/19 5:39 AM, David Holmes wrote:
> bug: https://bugs.openjdk.java.net/browse/JDK-8230422
> webrev: http://cr.openjdk.java.net/~dholmes/8230422/webrev/
>
> This is mostly a mechanical change from os::sleep to 
> os::naked_short_sleep or os::naked_sleep, but it affects code in 
> runtime, jfr, compiler and GC. The patch file is best to use for 
> review purposes.

Thumbs up. I used the patch file for everything except for:

     src/hotspot/share/runtime/os.cpp

That file needed frames... :-)

Dan

>
> Summary of changes:
> - added os::naked_sleep as a wrapper around os::naked_short_sleep for 
> sleeps longer than 1 second** - not usable by JavaThreads
> - os::sleep now only has the old interruptible path and takes a 
> JavaThread parameter rather than thread
> - changed os::sleep(thread,millis,false) to 
> os::naked_short_sleep(millis) or os::naked_sleep(millis) depending on 
> the timeout value
> - changed os::sleep(thread,millis,true) to os::sleep(thread,millis) 
> with checks/changes where needed to ensure "thread" is a JavaThread
>
> ** Many of the calls to this use a VM flag to define the timeout. That 
> either defaults to 1 or 0 (not used) but is otherwise unconstrained in 
> value. While sleeps longer than one second don't really make sense I 
> didn't want to preclude them without there being a range check in 
> place for the flag itself.
>
> Testing: tiers 1- 3
>
> I'd appreciate it if someone involved with Shenandoah can check the 
> one change in that code.
>
> Thanks,
> David