SkRacy<T> is a zero-overhead wrapper for a T, except it also
silences race warnings when TSAN is running.
Here we apply in several classes. In SkMatrix and SkPathRef,
we use it to opportunistically cache some idempotent work.
In SkPixelRef, we wrap the genIDs. We think the worst that
can happen here is we'll increment the global next-genID a
few times instead of once when we go to get another ID.
BUG=skia:
Committed: https://skia.googlesource.com/skia/+/d5e3e6ae1b3434ad1158f441902ff65f1eeaa3a7
CQ_EXTRA_TRYBOTS=tryserver.skia:Canary-Chrome-Ubuntu13.10-Ninja-x86_64-ToT-Trybot,Canary-Chrome-Win7-Ninja-x86-SharedLib_ToT-Trybot,Test-Ubuntu13.10-GCE-NoGPU-x86_64-Release-TSAN-Trybot
R=reed@google.com, mtklein@google.com
Author: mtklein@chromium.org
Review URL: https://codereview.chromium.org/371363004
Reason for revert:
hidden symbol 'AnnotateBenignRaceSized' in obj/base/third_party/dynamic_annotations/libdynamic_annotations.a(obj/base/third_party/dynamic_annotations/dynamic_annotations.dynamic_annotations.o) is referenced by DSO lib/libblink_platform.so
Original issue's description:
> Add SkRacy
>
> SkRacy<T> is a zero-overhead wrapper for a T, except it also
> silences race warnings when TSAN is running.
>
> Here we apply in several classes. In SkMatrix and SkPathRef,
> we use it to opportunistically cache some idempotent work.
>
> In SkPixelRef, we wrap the genIDs. We think the worst that
> can happen here is we'll increment the global next-genID a
> few times instead of once when we go to get another ID.
>
> BUG=skia:
>
> Committed: https://skia.googlesource.com/skia/+/d5e3e6ae1b3434ad1158f441902ff65f1eeaa3a7R=reed@google.com, mtklein@chromium.orgTBR=mtklein@chromium.org, reed@google.com
NOTREECHECKS=true
NOTRY=true
BUG=skia:
Author: mtklein@google.com
Review URL: https://codereview.chromium.org/377693005
SkRacy<T> is a zero-overhead wrapper for a T, except it also
silences race warnings when TSAN is running.
Here we apply in several classes. In SkMatrix and SkPathRef,
we use it to opportunistically cache some idempotent work.
In SkPixelRef, we wrap the genIDs. We think the worst that
can happen here is we'll increment the global next-genID a
few times instead of once when we go to get another ID.
BUG=skia:
R=reed@google.com, mtklein@google.com
Author: mtklein@chromium.org
Review URL: https://codereview.chromium.org/371363004
We're racing to invalidate the genID of our pixel ref when multiple
threads write into it, and also to call its genID-changed listeners.
We install no listeners on this particular pixel ref, nor do we ever
care about its genID at all. So these are benign races, races on
data we never make a decision from.
BUG=skia:2725
R=jcgregorio@google.com, mtklein@google.com
Author: mtklein@chromium.org
Review URL: https://codereview.chromium.org/370353004
