Better refcounting and locking

All major externally accessible objects (especially FontFamily and
FontCollection) are now reference counted. In addition, there is a
global lock intended to make operations thread-safe.

WIP notice: in this version of the patch, not all external API entry
points are protected by the lock. That should be fixed.

Change-Id: I14106196e99eb101e8bf1bcb4b81359759d2086c

1 files changed, 42 insertions, 0 deletions

diff --git a/include/minikin/MinikinRefCounted.h b/include/minikin/MinikinRefCounted.h
new file mode 100644
index 0000000..74d27fe
--- /dev/null
+++ b/include/minikin/MinikinRefCounted.h
@@ -0,0 +1,42 @@
+/*
+ * Copyright (C) 2014 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+// Base class for reference counted objects in Minikin
+
+#ifndef MINIKIN_REF_COUNTED_H
+#define MINIKIN_REF_COUNTED_H
+
+namespace android {
+
+class MinikinRefCounted {
+public:
+    void RefLocked() { mRefcount_++; }
+    void UnrefLocked() { if (--mRefcount_ == 0) { delete this; } }
+
+    // These refcount operations take the global lock.
+    void Ref();
+    void Unref();
+
+    MinikinRefCounted() : mRefcount_(1) { }
+
+    virtual ~MinikinRefCounted() { };
+private:
+    int mRefcount_;
+};
+
+}
+
+#endif   // MINIKIN_REF_COUNTED_H
\ No newline at end of file