Squashed 'gps/' content from commit 8582827c8

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git-subtree-split: 8582827c8f8cb19c2eff71f0737e17f3068ba41a

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diff --git a/utils/LocThread.h b/utils/LocThread.h
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+/* Copyright (c) 2015, The Linux Foundation. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ *       copyright notice, this list of conditions and the following
+ *       disclaimer in the documentation and/or other materials provided
+ *       with the distribution.
+ *     * Neither the name of The Linux Foundation, nor the names of its
+ *       contributors may be used to endorse or promote products derived
+ *       from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+ * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
+ * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
+ * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+#ifndef __LOC_THREAD__
+#define __LOC_THREAD__
+
+#include <stddef.h>
+#include <pthread.h>
+
+// abstract class to be implemented by client to provide a runnable class
+// which gets scheduled by LocThread
+class LocRunnable {
+public:
+    inline LocRunnable() {}
+    inline virtual ~LocRunnable() {}
+
+    // The method to be implemented by thread clients
+    // and be scheduled by LocThread
+    // This method will be repeated called until it returns false; or
+    // until thread is stopped.
+    virtual bool run() = 0;
+
+    // The method to be run before thread loop (conditionally repeatedly)
+    // calls run()
+    inline virtual void prerun() {}
+
+    // The method to be run after thread loop (conditionally repeatedly)
+    // calls run()
+    inline virtual void postrun() {}
+};
+
+// opaque class to provide service implementation.
+class LocThreadDelegate;
+
+// A utility class to create a thread and run LocRunnable
+// caller passes in.
+class LocThread {
+    LocThreadDelegate* mThread;
+public:
+    inline LocThread() : mThread(NULL) {}
+    virtual ~LocThread();
+
+    typedef pthread_t (*tCreate)(const char* name, void* (*start)(void*), void* arg);
+    // client starts thread with a runnable, which implements
+    // the logics to fun in the created thread context.
+    // The thread could be either joinable or detached.
+    // runnable is an obj managed by client. Client creates and
+    //          frees it (but must be after stop() is called, or
+    //          this LocThread obj is deleted).
+    //          The obj will be deleted by LocThread if start()
+    //          returns true. Else it is client's responsibility
+    //          to delete the object
+    // Returns 0 if success; false if failure.
+    bool start(tCreate creator, const char* threadName, LocRunnable* runnable, bool joinable = true);
+    inline bool start(const char* threadName, LocRunnable* runnable, bool joinable = true) {
+        return start(NULL, threadName, runnable, joinable);
+    }
+
+    // NOTE: if this is a joinable thread, this stop may block
+    // for a while until the thread is joined.
+    void stop();
+
+    // thread status check
+    inline bool isRunning() { return NULL != mThread; }
+};
+
+#endif //__LOC_THREAD__