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| author |  mtklein <mtklein@chromium.org> | 2015-02-03 13:38:58 -0800 |
|---|---|---|
| committer |  Commit bot <commit-bot@chromium.org> | 2015-02-03 13:38:58 -0800 |
| commit | 7b274c78fbeefa3818af68099545f2839c854847 (patch) | |
| tree | 6b18a0bedf025c859d751498f4048882948b9d68 /src/pdf/SkPDFTypes.h | |
| parent | 65fd599e43247e139bc3e7afaff9392073fec1bc (diff) | |
Port SkRefCnt.h to new SkAtomics.h
This adds sk_memory_barrier(), implemented using sk_atomic_fetch_add() on an uninitialized variable. If that becomes a problem we can drop this to the porting layer, using std::atomic_thread_fence() / __atomic_thread_fence() / __sync_synchronize().
The big win is that ref() doesn't generate a memory barrier any more on ARM.
This is an instance of SkSafeRef() in SkPaint(const SkPaint&) after this CL:
4d0: 684a ldr r2, [r1, #4]
4d2: 6018 str r0, [r3, #0]
4d4: b13a cbz r2, 4e6 <_ZN7SkPaintC1ERKS_+0x2e>
4d6: 1d10 adds r0, r2, #4
4d8: e850 4f00 ldrex r4, [r0]
4dc: 3401 adds r4, #1
4de: e840 4500 strex r5, r4, [r0]
4e2: 2d00 cmp r5, #0
4e4: d1f8 bne.n 4d8 <_ZN7SkPaintC1ERKS_+0x20>
Here's the before, pretty much the same with two memory barriers surrounding the ref():
4d8: 684a ldr r2, [r1, #4]
4da: 6018 str r0, [r3, #0]
4dc: b15a cbz r2, 4f6 <_ZN7SkPaintC1ERKS_+0x3e>
4de: 1d10 adds r0, r2, #4
4e0: f3bf 8f5f dmb sy
4e4: e850 4f00 ldrex r4, [r0]
4e8: 3401 adds r4, #1
4ea: e840 4500 strex r5, r4, [r0]
4ee: 2d00 cmp r5, #0
4f0: d1f8 bne.n 4e4 <_ZN7SkPaintC1ERKS_+0x2c>
4f2: f3bf 8f5f dmb sy
The miscellaneous files in here are just fixups to explicitly include SkMutex.h,
instead of leeching it off SkRefCnt.h.
No public API changes.
TBR=reed@google.com
Build trybots seem hosed.
NOTRY=true
BUG=skia:
Review URL: https://codereview.chromium.org/896803002
Diffstat (limited to 'src/pdf/SkPDFTypes.h')
| -rw-r--r-- | src/pdf/SkPDFTypes.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/src/pdf/SkPDFTypes.h b/src/pdf/SkPDFTypes.h index b0ce0b97d0..367bb7fda6 100644 --- a/src/pdf/SkPDFTypes.h +++ b/src/pdf/SkPDFTypes.h @@ -10,6 +10,7 @@ #ifndef SkPDFTypes_DEFINED #define SkPDFTypes_DEFINED +#include "SkMutex.h" #include "SkRefCnt.h" #include "SkScalar.h" #include "SkString.h" |