|author||Daniel S Fava <email@example.com>||Fri Nov 20 21:23:45 2020 +0100|
|committer||Ian Lance Taylor <firstname.lastname@example.org>||Wed Nov 25 15:59:35 2020 +0000|
runtime: check channel's elemsize before calling race detector When c.elemsize==0 we call raceacquire() and racerelease() as opposed to calling racereleaseacquire() The reason for this change is that, when elemsize==0, we don't allocate a full buffer for the channel. Instead of individual buffer entries, the race detector uses the c.buf as the only buffer entry. This simplification prevents us following the memory model's happens-before rules implemented in racereleaseacquire(). So, instead of calling racereleaseacquire(), we accumulate happens-before information in the synchronization object associated with c.buf. The functionality in this change is implemented in a new function called racenotify() Fixes #42598 Change-Id: I75b92708633fdfde658dc52e06264e2171824e51 Reviewed-on: https://go-review.googlesource.com/c/go/+/271987 Reviewed-by: Dmitry Vyukov <email@example.com> Reviewed-by: Russ Cox <firstname.lastname@example.org> Run-TryBot: Dmitry Vyukov <email@example.com> TryBot-Result: Go Bot <firstname.lastname@example.org> Trust: Ian Lance Taylor <email@example.com>
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