Index: src/core/SkLazyFnPtr.h |
diff --git a/src/core/SkLazyFnPtr.h b/src/core/SkLazyFnPtr.h |
deleted file mode 100644 |
index cb7832d4c51140433f4e70fd397b34422506073d..0000000000000000000000000000000000000000 |
--- a/src/core/SkLazyFnPtr.h |
+++ /dev/null |
@@ -1,58 +0,0 @@ |
-#ifndef SkLazyFnPtr_DEFINED |
-#define SkLazyFnPtr_DEFINED |
- |
-/** Declare a lazily-chosen static function pointer of type F. |
- * |
- * Example usage: |
- * |
- * typedef int (*FooImpl)(int, int); |
- * |
- * static FooImpl choose_foo() { return ... }; |
- * |
- * int Foo(int a, int b) { |
- * SK_DECLARE_STATIC_LAZY_FN_PTR(FooImpl, choice); |
- * return choice.get(choose_foo)(a, b); |
- * } |
- * |
- * You can think of SK_DECLARE_STATIC_LAZY_FN_PTR as a cheaper specialization of SkOnce. |
- * There is no mutex, and in the fast path, no memory barriers are issued. |
- * |
- * This must be used in a global or function scope, not as a class member. |
- */ |
-#define SK_DECLARE_STATIC_LAZY_FN_PTR(F, name) static Private::SkLazyFnPtr<F> name = { NULL } |
- |
- |
-// Everything below here is private implementation details. Don't touch, don't even look. |
- |
-#include "SkDynamicAnnotations.h" |
-#include "SkThread.h" |
- |
-namespace Private { |
- |
-// This has no constructor and is link-time initialized, so its members must be public. |
-template <typename F> |
-struct SkLazyFnPtr { |
- F get(F (*choose)()) { |
- // First, try reading to see if it's already set. |
- F fn = (F)SK_ANNOTATE_UNPROTECTED_READ(fPtr); |
- if (fn != NULL) { |
- return fn; |
- } |
- |
- // We think it's not already set. |
- fn = choose(); |
- |
- // No particular memory barriers needed; we're not guarding anything but the pointer itself. |
- F prev = (F)sk_atomic_cas(&fPtr, NULL, (void*)fn); |
- |
- // If prev != NULL, someone snuck in and set fPtr concurrently. |
- // If prev == NULL, we did write fn to fPtr. |
- return prev != NULL ? prev : fn; |
- } |
- |
- void* fPtr; |
-}; |
- |
-} // namespace Private |
- |
-#endif//SkLazyFnPtr_DEFINED |