Function- or method- local scope isn't threadsafe; the pointer is generally
zero-initialized on first use in function scope (i.e. lazily... we have to go
deeper), but for globals we can be pretty sure the linker will do that for us.
BUG=skia:
No public API changes.
TBR=reed@google.com
Review URL: https://codereview.chromium.org/651723003
We allow this to be raced on, and it may have already become not-dirty by the
time we get to this function if computed by another thread.
BUG=skia:
Review URL: https://codereview.chromium.org/398913002
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
There's little benefit to deduping matrices and regions: they're infrequently
used, and doubly infrequently reused. Their use-weighted byte cost is tiny.
There is some downside to deduping matrices and regions. Even when they're not
used, we prepare dictionaries for deduping them for every picture. Each of
these dictionaries costs 160 bytes, so two unused dictionaries make a big chunk
of the ~1100 bytes it takes to allocate an SkPictureRecord. (~330 come from
parent class SkCanvas, 768 from SkPictureRecord itself, here reduced to 448).
One side benefit of not deduping these guys is that the change weighs -140 lines of code.
It may go without saying, but this breaks the picture format.
Testing: out/Debug/tests && out/Debug/dm (which runs all picture modes by default)
BUG=skia:1850
R=reed@google.com, bensong@google.com, robertphillips@google.com
Author: mtklein@google.com
Review URL: https://codereview.chromium.org/143883006
git-svn-id: http://skia.googlecode.com/svn/trunk@13149 2bbb7eff-a529-9590-31e7-b0007b416f81
To dodge the problem, call computeBounds when creating the global empty path
ref.
There's still another race here, which is that we can race to create the empty
path ref in the first place. As written we can conceivably allocate an
arbitrary number of empty path refs, one of which ends up pointed to by the
global variable at the end.
I've punted on fixing this for now because 1) tsan has not complained yet; 2) I
think it can be fixed by the same approach as we can fix the memsets in
25415003, so I want to wait to see how that review goes
first.
BUG=
R=reed@google.com, robertphillips@google.com
Author: mtklein@google.com
Review URL: https://codereview.chromium.org/25745003
git-svn-id: http://skia.googlecode.com/svn/trunk@11576 2bbb7eff-a529-9590-31e7-b0007b416f81
