sync thread implementation

Adapter.cc

@@ -27,9 +27,10 @@ namespace pEp {
 
     messageToSend_t Adapter::_messageToSend = nullptr;
     notifyHandshake_t Adapter::_notifyHandshake = nullptr;
+    std::thread *_sync_thread = nullptr;
 
     Adapter::Adapter(messageToSend_t messageToSend,
-            notifyHandshake_t notifyHandshake, bool is_sync_thread)
+            notifyHandshake_t notifyHandshake)
     {
         if (messageToSend)
             _messageToSend = messageToSend;
@@ -39,10 +40,11 @@ namespace pEp {
 
         PEP_SESSION _session = session();
 
-        if (is_sync_thread) {
-            PEP_STATUS status = register_sync_callbacks(_session, nullptr,
-                    notifyHandshake, _retrieve_next_sync_event);
-            throw_status(status);
+        {
+            lock_guard<mutex> lock(mtx());
+
+            if (!_sync_thread)
+                _sync_thread = new thread();
         }
     }
 
@@ -115,5 +117,17 @@ namespace pEp {
 
         return queue().pop_front();
     }
+
+    void Adapter::sync_thread()
+    {
+        PEP_STATUS status = register_sync_callbacks(session(), nullptr,
+                _notifyHandshake, _retrieve_next_sync_event);
+        throw_status(status);
+
+        do_sync_protocol(session(), nullptr);
+        unregister_sync_callbacks(session());
+
+        session(release);
+    }
 }
 

Adapter.hh

@@ -4,6 +4,7 @@
 #pragma once
 
 #include "locked_queue.hh"
+#include <thread>
 #include <pEp/sync_api.h>
 
 namespace pEp {
@@ -12,11 +13,11 @@ namespace pEp {
     class Adapter {
             static messageToSend_t _messageToSend;
             static notifyHandshake_t _notifyHandshake;
+            static std::thread *_sync_thread;
 
         public:
             Adapter(messageToSend_t messageToSend,
-                    notifyHandshake_t notifyHandshake,
-                    bool is_sync_thread = false);
+                    notifyHandshake_t notifyHandshake);
             virtual ~Adapter() { }
 
             enum session_action {
@@ -34,6 +35,7 @@ namespace pEp {
         protected:
             static int _inject_sync_event(SYNC_EVENT ev, void *management);
             static SYNC_EVENT _retrieve_next_sync_event(void *management, time_t threshold);
+            static void sync_thread();
 
         private:
             static std::mutex& mtx()