1 files changed, 65 insertions, 0 deletions
diff --git a/src/deps/skia/include/private/GrSingleOwner.h b/src/deps/skia/include/private/GrSingleOwner.h
new file mode 100644
index 000000000..f612bb5fc
--- /dev/null
+++ b/src/deps/skia/include/private/GrSingleOwner.h
@@ -0,0 +1,65 @@
+/*
+ * Copyright 2016 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef GrSingleOwner_DEFINED
+#define GrSingleOwner_DEFINED
+
+#include "include/core/SkTypes.h"
+
+#ifdef SK_DEBUG
+#include "include/private/SkMutex.h"
+#include "include/private/SkThreadID.h"
+
+#define GR_ASSERT_SINGLE_OWNER(obj) \
+    GrSingleOwner::AutoEnforce debug_SingleOwner(obj, __FILE__, __LINE__);
+
+// This is a debug tool to verify an object is only being used from one thread at a time.
+class GrSingleOwner {
+public:
+     GrSingleOwner() : fOwner(kIllegalThreadID), fReentranceCount(0) {}
+
+     struct AutoEnforce {
+         AutoEnforce(GrSingleOwner* so, const char* file, int line)
+                : fFile(file), fLine(line), fSO(so) {
+             fSO->enter(file, line);
+         }
+         ~AutoEnforce() { fSO->exit(fFile, fLine); }
+
+         const char* fFile;
+         int fLine;
+         GrSingleOwner* fSO;
+     };
+
+private:
+     void enter(const char* file, int line) {
+         SkAutoMutexExclusive lock(fMutex);
+         SkThreadID self = SkGetThreadID();
+         SkASSERTF(fOwner == self || fOwner == kIllegalThreadID, "%s:%d Single owner failure.",
+                   file, line);
+         fReentranceCount++;
+         fOwner = self;
+     }
+
+     void exit(const char* file, int line) {
+         SkAutoMutexExclusive lock(fMutex);
+         SkASSERTF(fOwner == SkGetThreadID(), "%s:%d Single owner failure.", file, line);
+         fReentranceCount--;
+         if (fReentranceCount == 0) {
+             fOwner = kIllegalThreadID;
+         }
+     }
+
+     SkMutex fMutex;
+     SkThreadID fOwner    SK_GUARDED_BY(fMutex);
+     int fReentranceCount SK_GUARDED_BY(fMutex);
+};
+#else
+#define GR_ASSERT_SINGLE_OWNER(obj)
+class GrSingleOwner {}; // Provide a no-op implementation so we can pass pointers to constructors
+#endif
+
+#endif