1 files changed, 91 insertions, 0 deletions
diff --git a/gfx/skia/skia/include/private/base/SkThreadAnnotations.h b/gfx/skia/skia/include/private/base/SkThreadAnnotations.h
new file mode 100644
index 0000000000..fc2a4aacee
--- /dev/null
+++ b/gfx/skia/skia/include/private/base/SkThreadAnnotations.h
@@ -0,0 +1,91 @@
+/*
+ * Copyright 2019 Google LLC
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef SkThreadAnnotations_DEFINED
+#define SkThreadAnnotations_DEFINED
+
+// The bulk of this code is cribbed from:
+// http://clang.llvm.org/docs/ThreadSafetyAnalysis.html
+
+#if defined(__clang__) && (!defined(SWIG))
+#define SK_THREAD_ANNOTATION_ATTRIBUTE(x)   __attribute__((x))
+#else
+#define SK_THREAD_ANNOTATION_ATTRIBUTE(x)   // no-op
+#endif
+
+#define SK_CAPABILITY(x) \
+  SK_THREAD_ANNOTATION_ATTRIBUTE(capability(x))
+
+#define SK_SCOPED_CAPABILITY \
+  SK_THREAD_ANNOTATION_ATTRIBUTE(scoped_lockable)
+
+#define SK_GUARDED_BY(x) \
+  SK_THREAD_ANNOTATION_ATTRIBUTE(guarded_by(x))
+
+#define SK_PT_GUARDED_BY(x) \
+  SK_THREAD_ANNOTATION_ATTRIBUTE(pt_guarded_by(x))
+
+#define SK_ACQUIRED_BEFORE(...) \
+  SK_THREAD_ANNOTATION_ATTRIBUTE(acquired_before(__VA_ARGS__))
+
+#define SK_ACQUIRED_AFTER(...) \
+  SK_THREAD_ANNOTATION_ATTRIBUTE(acquired_after(__VA_ARGS__))
+
+#define SK_REQUIRES(...) \
+  SK_THREAD_ANNOTATION_ATTRIBUTE(requires_capability(__VA_ARGS__))
+
+#define SK_REQUIRES_SHARED(...) \
+  SK_THREAD_ANNOTATION_ATTRIBUTE(requires_shared_capability(__VA_ARGS__))
+
+#define SK_ACQUIRE(...) \
+  SK_THREAD_ANNOTATION_ATTRIBUTE(acquire_capability(__VA_ARGS__))
+
+#define SK_ACQUIRE_SHARED(...) \
+  SK_THREAD_ANNOTATION_ATTRIBUTE(acquire_shared_capability(__VA_ARGS__))
+
+// Would be SK_RELEASE, but that is already in use as SK_DEBUG vs. SK_RELEASE.
+#define SK_RELEASE_CAPABILITY(...) \
+  SK_THREAD_ANNOTATION_ATTRIBUTE(release_capability(__VA_ARGS__))
+
+// For symmetry with SK_RELEASE_CAPABILITY.
+#define SK_RELEASE_SHARED_CAPABILITY(...) \
+  SK_THREAD_ANNOTATION_ATTRIBUTE(release_shared_capability(__VA_ARGS__))
+
+#define SK_TRY_ACQUIRE(...) \
+  SK_THREAD_ANNOTATION_ATTRIBUTE(try_acquire_capability(__VA_ARGS__))
+
+#define SK_TRY_ACQUIRE_SHARED(...) \
+  SK_THREAD_ANNOTATION_ATTRIBUTE(try_acquire_shared_capability(__VA_ARGS__))
+
+#define SK_EXCLUDES(...) \
+  SK_THREAD_ANNOTATION_ATTRIBUTE(locks_excluded(__VA_ARGS__))
+
+#define SK_ASSERT_CAPABILITY(x) \
+  SK_THREAD_ANNOTATION_ATTRIBUTE(assert_capability(x))
+
+#define SK_ASSERT_SHARED_CAPABILITY(x) \
+  SK_THREAD_ANNOTATION_ATTRIBUTE(assert_shared_capability(x))
+
+#define SK_RETURN_CAPABILITY(x) \
+  SK_THREAD_ANNOTATION_ATTRIBUTE(lock_returned(x))
+
+#define SK_NO_THREAD_SAFETY_ANALYSIS \
+  SK_THREAD_ANNOTATION_ATTRIBUTE(no_thread_safety_analysis)
+
+#if defined(SK_BUILD_FOR_GOOGLE3) && !defined(SK_BUILD_FOR_WASM_IN_GOOGLE3)
+    extern "C" {
+        void __google_cxa_guard_acquire_begin(void);
+        void __google_cxa_guard_acquire_end  (void);
+    }
+    #define SK_POTENTIALLY_BLOCKING_REGION_BEGIN __google_cxa_guard_acquire_begin()
+    #define SK_POTENTIALLY_BLOCKING_REGION_END   __google_cxa_guard_acquire_end()
+#else
+    #define SK_POTENTIALLY_BLOCKING_REGION_BEGIN
+    #define SK_POTENTIALLY_BLOCKING_REGION_END
+#endif
+
+#endif  // SkThreadAnnotations_DEFINED