account: make callIDSet_ thread safe

Change-Id: Ib3d36408841d1b339a00bf9135b308afaa93b218

src/account.cpp

@@ -122,18 +122,21 @@ Account::~Account()
 void
 Account::attachCall(const std::string& id)
 {
+    std::lock_guard<std::mutex> lk {callIDSetMtx_};
     callIDSet_.insert(id);
 }
 
 void
 Account::detachCall(const std::string& id)
 {
+    std::lock_guard<std::mutex> lk {callIDSetMtx_};
     callIDSet_.erase(id);
 }
 
 void
 Account::freeAccount()
 {
+    std::lock_guard<std::mutex> lk {callIDSetMtx_};
     for (const auto& id : callIDSet_)
         Manager::instance().hangupCall(id);
 }

src/account.h

@@ -346,6 +346,7 @@ class Account : public Serializable, public std::enable_shared_from_this<Account
         /**
          * Set of call's ID attached to the account.
          */
+        std::mutex callIDSetMtx_;
         std::set<std::string> callIDSet_;
 
         void enableUpnp(bool state);