RFR (S): 8165859: gcTaskThread is missing volatile qualifier and barriers for _time_stamps

Kim Barrett kim.barrett at oracle.com
Mon Sep 19 19:18:18 UTC 2016


> On Sep 19, 2016, at 2:26 PM, Carsten Varming <varming at gmail.com> wrote:
> 
> Dear Erik,
> 
> According to orderAccess.hpp an acquire is supposed to be paired with a release. It doesn't look like there is any synchronization on the data written to the time stamp array, so what exactly is going on?
> 
> Carsten

_time_stamps gets written with a cmpxchg_ptr (line 63 of gcTaskThread.cpp), which includes release semantics for the write; see atomic.hpp.



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