1 files changed, 76 insertions, 0 deletions
diff --git a/include/private/ui/SurfaceFlingerSynchro.h b/include/private/ui/SurfaceFlingerSynchro.h
new file mode 100644
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+++ b/include/private/ui/SurfaceFlingerSynchro.h
@@ -0,0 +1,76 @@
+/*
+ * Copyright (C) 2008 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.
+ */
+
+
+#ifndef ANDROID_SURFACE_FLINGER_SYNCHRO_H
+#define ANDROID_SURFACE_FLINGER_SYNCHRO_H
+
+#include <stdint.h>
+#include <sys/types.h>
+#include <utils/Errors.h>
+#include <utils/threads.h>
+#include <ui/ISurfaceComposer.h>
+
+namespace android {
+
+class SurfaceFlinger;
+
+class SurfaceFlingerSynchro
+{
+public:
+
+                // client constructor
+                SurfaceFlingerSynchro(const sp<ISurfaceComposer>& flinger);
+                ~SurfaceFlingerSynchro();
+    
+                // signal surfaceflinger for some work
+    status_t    signal();
+    
+private:
+    class Barrier {
+    public:
+        Barrier();
+        ~Barrier();
+        void open();
+        void close();
+        void waitAndClose();
+        status_t waitAndClose(nsecs_t timeout);
+    private:
+        enum { OPENED, CLOSED };
+        mutable     Mutex       lock;
+        mutable     Condition   cv;
+        volatile    int         state;
+    };
+
+    friend class SurfaceFlinger;
+
+                // server constructor
+                SurfaceFlingerSynchro();
+                
+    void        open();
+    
+                // wait until there is some work to do
+    status_t    wait();
+    status_t    wait(nsecs_t timeout);
+    
+    sp<ISurfaceComposer> mSurfaceComposer;
+    Barrier              mBarrier;
+};
+
+}; // namespace android
+
+#endif // ANDROID_SURFACE_FLINGER_SYNCHRO_H
+