skia WIPjarred/canvas

1 files changed, 56 insertions, 0 deletions

diff --git a/src/deps/skia/include/private/SkMutex.h b/src/deps/skia/include/private/SkMutex.h
new file mode 100644
index 000000000..096f3ebc9
--- /dev/null
+++ b/src/deps/skia/include/private/SkMutex.h
@@ -0,0 +1,56 @@
+/*
+ * Copyright 2015 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef SkMutex_DEFINED
+#define SkMutex_DEFINED
+
+#include "include/core/SkTypes.h"
+#include "include/private/SkMacros.h"
+#include "include/private/SkSemaphore.h"
+#include "include/private/SkThreadAnnotations.h"
+#include "include/private/SkThreadID.h"
+
+class SK_CAPABILITY("mutex") SkMutex {
+public:
+    constexpr SkMutex() = default;
+
+    void acquire() SK_ACQUIRE() {
+        fSemaphore.wait();
+        SkDEBUGCODE(fOwner = SkGetThreadID();)
+    }
+
+    void release() SK_RELEASE_CAPABILITY() {
+        this->assertHeld();
+        SkDEBUGCODE(fOwner = kIllegalThreadID;)
+        fSemaphore.signal();
+    }
+
+    void assertHeld() SK_ASSERT_CAPABILITY(this) {
+        SkASSERT(fOwner == SkGetThreadID());
+    }
+
+private:
+    SkSemaphore fSemaphore{1};
+    SkDEBUGCODE(SkThreadID fOwner{kIllegalThreadID};)
+};
+
+class SK_SCOPED_CAPABILITY SkAutoMutexExclusive {
+public:
+    SkAutoMutexExclusive(SkMutex& mutex) SK_ACQUIRE(mutex) : fMutex(mutex) { fMutex.acquire(); }
+    ~SkAutoMutexExclusive() SK_RELEASE_CAPABILITY() { fMutex.release(); }
+
+    SkAutoMutexExclusive(const SkAutoMutexExclusive&) = delete;
+    SkAutoMutexExclusive(SkAutoMutexExclusive&&) = delete;
+
+    SkAutoMutexExclusive& operator=(const SkAutoMutexExclusive&) = delete;
+    SkAutoMutexExclusive& operator=(SkAutoMutexExclusive&&) = delete;
+
+private:
+    SkMutex& fMutex;
+};
+
+#endif  // SkMutex_DEFINED