nexus: Implement wifi scanner and fix a lot of bugs

Signed-off-by: San Mehat <san@google.com>
diff --git a/nexus/WifiScanner.h b/nexus/WifiScanner.h
new file mode 100644
index 0000000..9ba1309
--- /dev/null
+++ b/nexus/WifiScanner.h
@@ -0,0 +1,36 @@
+#ifndef _WIFISCANNER_H
+#define _WIFISCANNER_H
+
+#include <pthread.h>
+
+class Supplicant;
+
+class WifiScanner {
+    pthread_t       mWorker;
+    pthread_mutex_t mWorkerLock;
+    bool            mWorkerRunning;
+    bool            mAbortRequest;
+    pthread_mutex_t mAbortRequestLock;
+
+    Supplicant *mSuppl;
+    int        mPeriod;
+    bool       mActive;
+    
+
+public:
+    WifiScanner(Supplicant *suppl, int period);
+    virtual ~WifiScanner() {}
+
+    int getPeriod() { return mPeriod; }
+
+    int startPeriodicScan(bool active);
+    int stopPeriodicScan();
+
+private:
+    static void *threadStart(void *obj);
+    static void threadCleanup(void *obj);
+
+    void run();
+};
+
+#endif