diff options
| author |  scroggo@google.com <scroggo@google.com@2bbb7eff-a529-9590-31e7-b0007b416f81> | 2012-07-16 13:13:29 +0000 |
|---|---|---|
| committer | scroggo@google.com <scroggo@google.com@2bbb7eff-a529-9590-31e7-b0007b416f81> | 2012-07-16 13:13:29 +0000 |
| commit | e3f84f3911d6ab1c99030fef3200199755251d51 (patch) | |
| tree | 6b49e6c64b5ee84be0e3c032062eb14f7fb0fa90 /src/ports/SkThread_win.cpp | |
| parent | fde2c0af2fd5aae19ab6c8b5228debd5b6209856 (diff) | |
Add a skia method to perform an atomic add.
Complements sk_atomic_inc for when you want to increase by more than one.
Review URL: https://codereview.appspot.com/6350106
git-svn-id: http://skia.googlecode.com/svn/trunk@4614 2bbb7eff-a529-9590-31e7-b0007b416f81
Diffstat (limited to 'src/ports/SkThread_win.cpp')
| -rw-r--r-- | src/ports/SkThread_win.cpp | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/src/ports/SkThread_win.cpp b/src/ports/SkThread_win.cpp index e833314843..7d091d2a67 100644 --- a/src/ports/SkThread_win.cpp +++ b/src/ports/SkThread_win.cpp @@ -16,7 +16,7 @@ //intrinsic, include intrin.h and put the function in a #pragma intrinsic //directive. //The pragma appears to be unnecessary, but doesn't hurt. -#pragma intrinsic(_InterlockedIncrement, _InterlockedDecrement) +#pragma intrinsic(_InterlockedIncrement, _InterlockedAdd, _InterlockedDecrement) #pragma intrinsic(_InterlockedCompareExchange) int32_t sk_atomic_inc(int32_t* addr) { @@ -24,6 +24,12 @@ int32_t sk_atomic_inc(int32_t* addr) { return _InterlockedIncrement(reinterpret_cast<LONG*>(addr)) - 1; } +int32_t sk_atomic_add(int32_t* addr, int32_t inc) { + // InterlockedAdd returns the new value, we want to return the old. + LONG value = reinterpret_cast<LONG>(inc); + return _InterlockedAdd(reinterpret_cast<LONG*>(addr), value) - value; +} + int32_t sk_atomic_dec(int32_t* addr) { return _InterlockedDecrement(reinterpret_cast<LONG*>(addr)) + 1; } |